Unknown operations throwing off polling timing

Mbed OS Best practice
1

I am trying to get a tight polling loop on two pins of an arduino nano 33 BLE to read an optical encoder. I implemented the code below using Mbed CE…

#include "mbed.h"

Ticker counterTicker;

volatile int bufpresE[2500];//Set to reflect memory limits
volatile int bufpresF[2500];//Set to reflect memory limits
volatile int buft3[2500];//Set to reflect memory limits

volatile int i = 0;
volatile int k = 1;
int l = 0;
volatile int n = 0;

void ISRcounter(void)
{
    counterTicker.detach();

    for (n = 0; n < 30000000; n++)
    {
        bufpresE[k] = ((NRF_P0->IN & 0x08000000) ? 1 : 0) ;
        bufpresF[k] = ((NRF_P1->IN & 0x00000004) ? 1 : 0) ;
        buft3[k] = DWT->CYCCNT;
        if ((bufpresE[k-1] != bufpresE[k]) || (bufpresF[k-1] != bufpresF[k]))
        {
            k++;
        }
    }

    i = 1;
}

int main()
{
  NRF_P0->PIN_CNF[27] = 0x0C;
  NRF_P1->PIN_CNF[2] = 0x0C;

  bufpresE[0] = ((NRF_P0->IN & 0x08000000) ? 1 : 0) ;
  bufpresF[0] = ((NRF_P1->IN & 0x00000004) ? 1 : 0) ;
  bufpresE[1] = bufpresE[0];
  bufpresF[1] = bufpresF[0];
  buft3[0] = 0;

  CoreDebug->DEMCR |= 0x01000000; //Enable the use of DWT.
  DWT->CYCCNT = 0; //Reset cycle counter.
  DWT->CTRL |= 0x1; //Enable cycle counter.

  counterTicker.attach(ISRcounter, 3ms); // Call ISRcounter function every stated s.

  while(true)
  {
    if (i == 1)
    {
      for (l = 0; l < k; l++)//Set to reflect memory limits
        {
          printf("%i, %i, %i\n", buft3[l], bufpresE[l], bufpresF[l]);
        }
        printf("end of sensor data\n");
      }
	}

	// main() is expected to loop forever.
	// If main() actually returns the processor will halt
	return 0;
  }

and got the output below…

1	0	0	0
2	412405887	0	1
3	412597180	1	1
4	413032223	0	1
5	413079681	0	0
6	413116149	1	0
7	413148207	1	1
8	413177965	0	1
9	413207438	0	0
10	413235326	1	0
11	413262874	1	1
12	413289442	0	1
13	413314570	0	0
14	413340368	1	0
15	413359831	1	1
16	413380294	0	1
17	413400637	0	0
18	413419175	1	0
19	413437208	1	1
20	413454316	0	1
21	413471304	0	0
22	413487147	1	0
23	413502980	1	1
24	413518438	0	1
25	413533996	0	0
26	413549014	1	0
27	413564132	1	1
28	413579260	0	1
29	413594928	0	0
30	413610331	1	0
31	413626384	1	1
32	413642282	0	1
33	413658335	0	0
34	413674453	1	0
35	413690561	1	1
36	413706899	0	1
37	413723667	0	0
38	413740005	1	0
39	413756553	1	1
40	413772781	0	1
41	413789219	0	0
42	413807427	1	0
43	413822820	1	1
44	413839323	0	1
45	413856696	0	0
46	413875949	1	0
47	413890957	1	1
48	413908120	0	1
49	413926373	0	0
50	413950081	1	0
51	413962009	1	1
52	413980272	0	1
53	413999295	0	0
54	414019263	1	0
55	414038726	1	1
56	414058584	0	1
57	414078762	0	0
58	414101920	1	0
59	414118138	1	1
60	414137226	0	1
61	414156744	0	0
62	414176877	1	0
63	414195130	1	1
64	414213778	0	1
65	414233241	0	0
66	414252164	1	0
67	414271462	1	1
68	414290605	0	1
69	414310178	0	0
70	414329486	1	0
71	414349609	1	1
72	414369247	0	1
73	414389865	0	0
74	414409943	1	0
75	414430286	1	1
76	414449924	0	1
77	414470487	0	0
78	414489795	1	0
79	414509313	1	1
80	414528071	0	1
81	414547204	0	0
82	414566182	1	0
83	414583775	1	1
84	414601763	0	1
85	414620126	0	0
86	414640644	1	0
87	414655432	1	1
88	414672925	0	1
89	414691453	0	0
90	414715051	1	0
91	414727584	1	1
92	414745132	0	1
93	414763935	0	0
94	414781978	1	0
95	414800176	1	1
96	414818329	0	1
97	414836307	0	0
98	414856550	1	0
99	414872988	1	1
100	414890591	0	1
101	414908789	0	0
102	414926447	1	0
103	414944535	1	1
104	414961973	0	1
105	414980006	0	0
106	414997279	1	0
107	415015587	1	1
108	415032970	0	1
109	415051058	0	0
110	415068771	1	0
111	415086584	1	1
112	415104242	0	1
113	415121890	0	0
114	415139438	1	0
115	415156316	1	1
116	415173204	0	1
117	415190467	0	0
118	415206695	1	0
119	415223903	1	1
120	415239746	0	1
121	415255524	0	0
122	415274722	1	0
123	415287420	1	1
124	415302493	0	1
125	415318491	0	0
126	415335599	1	0
127	415349012	1	1
128	415363975	0	1
129	415379643	0	0
130	415394826	1	0
131	415409614	1	1
132	415424852	0	1
133	415440410	0	0
134	415454933	1	0
135	415470271	1	1
136	415485344	0	1
137	415500407	0	0
138	415515425	1	0
139	415530543	1	1
140	415545121	0	1
141	415560624	0	0
142	415575532	1	0
143	415590595	1	1
144	415605393	0	1
145	415620456	0	0
146	415649884	1	0
147	415650867	1	1
148	415665610	0	1
149	415681333	0	0
150	415704491	1	0
151	415711414	1	1
152	415726707	0	1
153	415742375	0	0
154	415773398	1	1
155	415788351	0	1
156	415804514	0	0
157	415820467	1	0
158	415835310	1	1
159	415850823	0	1
160	415866326	0	0
161	415894104	1	0
162	415897507	1	1
163	415912470	0	1
164	415928358	0	0
165	415947611	1	0
166	415958604	1	1
167	415973952	0	1
168	415989510	0	0
169	416004363	1	0
170	416019701	1	1
171	416034664	0	1
172	416050277	0	0
173	416065460	1	0
174	416080633	1	1
175	416095981	0	1
176	416111429	0	0
177	416126447	1	0
178	416142060	1	1
179	416157298	0	1
180	416173296	0	0
181	416188699	1	0
182	416204367	1	1
183	416220375	0	1
184	416236263	0	0
185	416252106	1	0
186	416268544	1	1
187	416284552	0	1
188	416301540	0	0
189	416317548	1	0
190	416334591	1	1
191	416351479	0	1
192	416368302	0	0
193	416385465	1	0
194	416402508	1	1
195	416419616	0	1
196	416437044	0	0
197	416454152	1	0
198	416472405	1	1
199	416489623	0	1
200	416508261	0	0
201	416526194	1	0
202	416544392	1	1
203	416562380	0	1
204	416582118	0	0
205	416600766	1	0
206	416620504	1	1
207	416640417	0	1
208	416661035	0	0
209	416680728	1	0
210	416702721	1	1
211	416722414	0	1
212	416745287	0	0
213	416767180	1	0
214	416789998	1	1
215	416812276	0	1
216	416836689	0	0
217	416858307	1	0
218	416884205	1	1
219	416907143	0	1
220	416932381	0	0
221	416958069	1	0
222	416982537	1	1
223	417009380	0	1
224	417035663	0	0
225	417062726	1	0
226	417090439	1	1
227	417119427	0	1
228	417148240	0	0
229	417178438	1	0
230	417209341	1	1
231	417239704	0	1
232	417270497	0	0
233	417304215	1	0
234	417335393	1	1
235	417369826	0	1
236	417404579	0	0
237	417440442	1	0
238	417479045	1	1
239	417519528	0	1
240	417565666	0	0
241	417613849	1	0
242	417667577	1	1
243	417724945	0	1
244	417796933	0	0
245	417885156	1	0
246	418027214	1	1
247	418269107	1	0
248	418388680	0	0
249	418520728	0	1
250	418700471	0	0
251	418747499	0	1
252	418917837	1	1
253	419223850	1	0
254	419304703	1	1
255	419421031	0	1
256	419478059	0	0
257	419532457	1	0
258	419579365	1	1
259	419625568	0	1
260	419697886	0	0
261	419758994	1	0
262	419825537	1	1
263	419894290	0	1
264	419953023	0	0
265	420020841	1	0
266	420121319	1	1
267	420212292	0	1
268	420313595	0	0
269	420413863	1	0
270	420568736	1	1
271	420698979	0	1
272	421387902	1	1
273	421547285	1	0
274	421664493	0	0
275	421778611	0	1
276	421883499	1	1
277	421975727	1	0
278	422066590	0	0
279	422157663	0	1
280	422233016	1	1
281	422309294	1	0
282	422382007	0	0
283	422459165	0	1
284	422532318	1	1
285	422605846	1	0
286	422672069	0	0
287	422743177	0	1
288	422806375	1	1
289	422875173	1	0
290	422938096	0	0
291	422997929	0	1
292	423057057	1	1
293	423113700	1	0
294	423171838	0	0
295	423249876	0	1
296	423302844	1	1
297	423362732	1	0
298	423426645	0	0
299	423504353	0	1
300	423576516	1	1
301	423660934	1	0
302	423738927	0	0
303	423819990	0	1
304	423890613	1	1
305	423971731	1	0
306	424052859	0	0
307	424149157	0	1
308	424265375	1	1
309	424396158	1	0
310	424508306	0	0
311	424666314	0	1
312	424683642	1	1
313	424768995	1	0
314	424850948	0	0
315	424935476	0	1
316	425013194	1	1
317	425083422	1	0
318	425142165	0	0
319	425194573	0	1
320	425239126	1	1
321	425281579	1	0
322	425324702	0	0
323	425369685	0	1
324	425412093	1	1
325	425458506	1	0
326	425506414	0	0
327	425555467	0	1
328	425594575	1	1
329	425637743	1	0
330	425679656	0	0
331	425721944	0	1
332	425764407	1	1
333	425809060	1	0
334	425852843	0	0
335	425895571	0	1
336	425939959	1	1
337	425984887	1	0
338	426032300	0	0
339	426048738	1	0
340	426082886	0	0
341	426117529	0	1
342	426169892	1	1
343	426192655	1	0
344	426211633	0	0
345	426247761	0	1
346	426359414	1	1
347	426425407	1	0
348	426557685	0	0
349	426593538	0	1
350	426742756	1	1
351	426794174	0	1
352	427073622	0	0
353	427375080	0	1
354	427793028	1	1
355	427966491	1	0
356	428112959	0	0
357	428231697	0	1
358	428370905	1	1
359	428505978	1	0
360	428585896	0	0
361	428636269	0	1
362	428719927	1	1
363	428824145	1	0
364	428921113	0	0
365	428980396	0	1
366	429022474	1	1
367	429073672	1	0
368	429144020	0	0
369	429217603	0	1
370	429317761	1	1
371	429368739	1	0
372	429419892	0	0
373	429480000	0	1
374	429558653	1	1
375	429672661	1	0
376	429774854	0	0
377	429859327	0	1
378	429897555	1	1
379	429962338	1	0
380	430171341	0	0
381	430246244	0	1
382	430305207	1	1
383	430412285	1	0
384	430539008	0	0
385	430605771	0	1
386	430661104	1	1
387	430711037	1	0
388	430764555	0	0
389	430865363	0	1
390	430972286	1	1
391	431059179	1	0
392	431135797	0	0
393	431257835	0	1
394	431376088	1	1
395	431503901	1	0
396	432294364	1	1
397	432510242	0	1
398	432746790	0	0
399	432895623	1	0
400	433060231	1	1
401	433219404	0	1
402	433359262	0	0
403	433499625	1	0
404	433591633	1	1
405	433697786	0	1
406	433814379	0	0
407	433923667	1	0
408	434009020	1	1
409	434091413	0	1
410	434186666	0	0
411	434285229	1	0
412	434364422	1	1
413	434450610	0	1
414	434551088	0	0
415	434647286	1	0
416	434725379	1	1
417	434806287	0	1
418	434897690	0	0
419	434990313	1	0
420	435077371	1	1
421	435162074	0	1
422	435247757	0	0
423	435335705	1	0
424	435411763	1	1
425	435495146	0	1
426	435584349	0	0
427	435674112	1	0
428	435769200	1	1
429	435869798	0	1
430	435963621	0	0
431	436054649	1	0
432	436155127	1	1
433	436252920	0	1
434	436351693	0	0
435	436457626	1	0
436	436575429	1	1
437	436682847	0	1
438	436807415	0	0
439	436966423	1	0
440	437134881	1	1
441	437348944	0	1
442	437642857	0	0
443	438838340	0	1
444	439176043	1	1
445	439451036	1	0
446	439729009	0	0
447	439979637	1	0
448	440239725	1	1
449	440393948	0	1
450	440527041	0	0
451	440635449	1	0
452	440763812	1	1
453	440889600	0	1
454	441005148	0	0
455	441140836	1	0
456	441313694	1	1
457	441468852	0	1
458	441724760	0	0
459	443418048	0	1
460	443845951	1	1
461	444160764	1	0
462	444492582	0	0
463	444755420	0	1
464	445047803	1	1
465	445315756	1	0
466	445567549	0	0
467	445828792	0	1
468	446102145	1	1
469	446406948	1	0
470	446705436	0	0
471	447047199	0	1
472	447455027	1	1
473	448081140	1	0
474	450887518	1	1
475	453070141	0	1
476	454625369	0	0
477	459222327	0	1		
end of sensor data

Added line numbers for easy referencing. I have an unexpected sequence which should not happen @ line 153-154. This indicates that the processor is busy elsewhere. I want the processor to focus completely on the timer interrupt when it goes off and only attend to anything else afterwards. How can i best prevent other processes from affecting the timing of the code above?

2

Hmm, what happens if you do the loop in a critical section (e.g. core_util_critical_section_enter())? That should prevent any other interrupts from executing.

If the critical section fixes it, next step is to figure out which interrupt is causing the problem. In the past, I’ve done this by turning off interrupts in the CPU registers until the problem goes away (you can binary search it!). One likely candidate could be the UART interrupt as this is active whenever text is being printed over the serial console.

3

I have tried “core_util_critical_section_enter()” but that didn’t help. Placed

core_util_critical_section_enter();

before the for-loop in the ISRcounter timer interrupt and placed

core_util_critical_section_exit();

after the loop.

Ended up with the results below.

1	0	0	0
2	193466	1	0
3	5184108	0	0
4	5184156	1	0
5	6076634	0	0
6	6076682	1	0
7	6110280	0	0
8	6110328	1	0
9	7350241	0	0
10	7350289	1	0
11	7370742	0	0
12	7370790	1	0
13	9943628	0	0
14	9943676	1	0
15	11222639	0	0
16	11222687	1	0
17	11249575	0	0
18	11249623	1	0
19	13793256	0	0
20	13793304	1	0
21	16997487	0	0
22	16997535	1	0
23	23414323	0	0
24	23414371	1	0
25	23441039	0	0
26	23441087	1	0
27	23454500	0	0
28	23454548	1	0
29	23541496	0	0
30	23541544	1	0
31	24059857	0	0
32	24059905	1	0
33	24464478	0	0
34	24464526	1	0
35	26614744	0	0
36	26614792	1	0
37	27315540	0	0
38	27315588	1	0
39	28547471	0	0
40	28547519	1	0
41	29844467	0	0
42	29844515	1	0
43	31124523	0	0
44	31124571	1	0
45	33043184	0	0
46	33043232	1	0
47	38213500	0	0
48	38213548	1	0
49	38349116	0	0
50	38349164	1	0
51	39634562	0	0
52	39634610	1	0
53	40131968	0	0
54	40132016	1	0
55	41441889	0	0
56	41441937	1	0
57	42052485	0	0
58	42052533	1	0
59	42178916	0	0
60	42178964	1	0
61	42455497	0	0
62	42455545	1	0
63	43886583	0	0
64	43886631	1	0
65	44529134	0	0
66	44529182	1	0
67	44992495	0	0
68	44992543	1	0
69	45896021	0	0
70	45896069	1	0
71	47572682	0	0
72	47572730	1	0
73	47864168	0	0
74	47864216	1	0
75	47959854	0	0
76	47959902	1	0
77	48470240	0	0
78	48470288	1	0
79	49114386	0	0
80	49114434	1	0
81	49147207	0	0
82	49147255	1	0
83	49246908	0	0
84	49246956	1	0
85	50405744	0	0
86	50405792	1	0
87	51423065	0	0
88	51423113	1	0
89	51801946	0	0
90	51801994	1	0
91	51815132	0	0
92	51815180	1	0
93	52965608	0	0
94	52965656	1	0
95	54003389	0	0
96	54003437	1	0
97	54268310	0	0
98	54268358	1	0
99	55437651	0	0
100	55437699	1	0
101	56539177	0	0
102	56539225	1	0
103	56947648	0	0
104	56947696	1	0
105	57513474	0	0
106	57513522	1	0
107	57819590	0	0
108	57819638	1	0
109	58743026	0	0
110	58743074	1	0
111	59129332	0	0
112	59129380	1	0
113	60030603	0	0
114	60030651	1	0
115	60064524	0	0
116	60064572	1	0
117	61342435	0	0
118	61342483	1	0
119	61946871	0	0
120	61946919	1	0
121	62976182	0	0
122	62976230	1	0
123	63269153	0	0
124	63269201	1	0
125	63862094	0	0
126	63862142	1	0
127	65146495	0	0
128	65146543	1	0
129	65828921	0	0
130	65828969	1	0
131	65944132	0	0
132	65944180	1	0
133	66425588	0	0
134	66425636	1	0
135	67147449	0	0
136	67147497	1	0
137	67859795	0	0
138	67859843	1	0
139	68931786	0	0
140	68931834	1	0
141	68999972	0	0
142	69000020	1	0
143	69137293	0	0
144	69137341	1	0
145	69177869	0	0
146	69177917	1	0
147	69458135	0	0
148	69458183	1	0
149	69700836	0	0
150	69700884	1	0
151	69794817	0	0
152	69794865	1	0
153	70336333	0	0
154	70336381	1	0
155	70682324	0	0
156	70682372	1	0
157	70917820	0	0
158	70917868	1	0
159	70931281	0	0
160	70931329	1	0
161	72896802	0	0
162	72896850	1	0
163	74154693	0	0
164	74154741	1	0
165	74167879	0	0
166	74167927	1	0
167	75346515	0	0
168	75346563	1	0
169	75433511	0	0
170	75433559	1	0
171	75588212	0	0
172	75588260	1	0
173	75874748	0	0
174	75874796	1	0
175	76081039	0	0
176	76081087	1	0
177	76713140	0	0
178	76713188	1	0
179	77335561	0	0
180	77335609	1	0
181	77404022	0	0
182	77404070	1	0
183	78037498	0	0
184	78037546	1	0
185	78077854	0	0
186	78077902	1	0
187	79259460	0	0
188	79259508	1	0
189	79300641	0	0
190	79300689	1	0
191	79968822	0	0
192	79968870	1	0
193	80716148	0	0
194	80716196	1	0
195	81177749	0	0
196	81177797	1	0
197	81224595	0	0
198	81224643	1	0
199	81829306	0	0
200	81829354	1	0
201	81922572	0	0
202	81922620	1	0
203	82465463	0	0
204	82465511	1	0
205	83186279	0	0
206	83186327	1	0
207	83690395	0	0
208	83690443	1	0
209	83751321	0	0
210	83751369	1	0
211	83792502	0	0
212	83792550	1	0
213	83820153	0	0
214	83820201	1	0
215	84332464	0	0
216	84332512	1	0
217	84394050	0	0
218	84394098	1	0
219	84407566	0	0
220	84407614	1	0
221	84448362	0	0
222	84448410	1	0
223	84817838	0	0
224	84817886	1	0
225	85033589	0	0
226	85033637	1	0
227	85195825	0	0
228	85195873	1	0
229	85701701	0	0
230	85701749	1	0
231	85708452	0	0
232	85708500	1	0
233	85735388	0	0
234	85735436	1	0
235	86096449	0	0
236	86096497	1	0
237	86344320	0	0
238	86344368	1	0
239	86996826	0	0
240	86996874	1	0
241	87022937	0	0
242	87022985	1	0
243	88884948	0	0
244	88884996	1	0
245	88898134	0	0
246	88898182	1	0
247	88904775	0	0
248	88904823	1	0
249	88958331	0	0
250	88958379	1	0
251	88984717	0	0
252	88984765	1	0
253	90228308	0	0
254	90228356	1	0
255	90268939	0	0
256	90268987	1	0
257	90808200	0	0
258	90808248	1	0
259	91469726	0	0
260	91469774	1	0
261	91476697	0	0
262	91476745	1	0
263	92136133	0	0
264	92136181	1	0
265	92170549	0	0
266	92170597	1	0
267	92177575	0	0
268	92177623	1	0
269	94039861	0	0
270	94039909	1	0
271	94702102	0	0
272	94702150	1	0
273	94709128	0	0
274	94709176	1	0
275	95251249	0	0
276	95251297	1	0
277	95399625	0	0
278	95399673	1	0
279	95948566	0	0
280	95948614	1	0
281	96531387	0	0
282	96531435	1	0
283	96591873	0	0
284	96591921	1	0
285	96639654	0	0
286	96639702	1	0
287	96646405	0	0
288	96646453	1	0
289	96679831	0	0
290	96679879	1	0
291	96686582	0	0
292	96686630	1	0
293	97284693	0	0
294	97284741	1	0
295	97954799	0	0
296	97954847	1	0
297	99162970	0	0
298	99163018	1	0
299	99249196	0	0
300	99249244	1	0
301	99975677	0	0
302	99975725	1	0
303	100527698	0	0
304	100527746	1	0
305	101140329	0	0
306	101140377	1	0
307	102426050	0	0
308	102426098	1	0
309	103667331	0	0
310	103667379	1	0
311	103680737	0	0
312	103680785	1	0
313	103768668	0	0
314	103768716	1	0
315	104064224	0	0
316	104064272	1	0
317	104313855	0	0
318	104313903	1	0
319	104997271	0	0
320	104997319	1	0
321	105010677	0	0
322	105010725	1	0
323	105049713	0	0
324	105049761	1	0
325	105644909	0	0
326	105644957	1	0
327	106313310	0	0
328	106313358	1	0
329	106326661	0	0
330	106326709	1	0
331	107533952	0	0
332	107534000	1	0
333	108198888	0	0
334	108198936	1	0
335	108212459	0	0
336	108212507	1	0
337	110124520	0	0
338	110124568	1	0
339	110131161	0	0
340	110131209	1	0
341	110172177	0	0
342	110172225	1	0
343	110178763	0	0
344	110178811	1	0
345	110738319	0	0
346	110738367	1	0
347	110904570	0	0
348	110904618	1	0
349	111405001	0	0
350	111405049	1	0
351	112008502	0	0
352	112008550	1	0
353	112094508	0	0
354	112094556	1	0
355	112694269	0	0
356	112694317	1	0
357	112720325	0	0
358	112720373	1	0
359	112733841	0	0
360	112733889	1	0
361	112740537	0	0
362	112740585	1	0
363	113939303	0	0
364	113939351	1	0
365	113952379	0	0
366	113952427	1	0
367	114568585	0	0
368	114568633	1	0
369	114682256	0	0
370	114682304	1	0
371	114736527	0	0
372	114736575	1	0
373	115244273	0	0
374	115244321	1	0
375	115312184	0	0
376	115312232	1	0
377	115866460	0	0
378	115866508	1	0
379	116596681	0	0
380	116596729	1	0
381	117153927	0	0
382	117153975	1	0
383	117810833	0	0
384	117810881	1	0
385	117824019	0	0
386	117824067	1	0
387	118451610	0	0
388	118451658	1	0
389	118478821	0	0
390	118478869	1	0
391	118525887	0	0
392	118525935	1	0
393	118539018	0	0
394	118539066	1	0
395	119067774	0	0
396	119067822	1	0
397	119101310	0	0
398	119101358	1	0
399	120863276	0	0
400	120870199	1	0
401	121004337	0	0
402	121004385	1	0
403	121031383	0	0
404	121031431	1	0
405	121106774	0	0
406	121106822	1	0
407	122118100	0	0
408	122118148	1	0
409	122333961	0	0
410	122334009	1	0
411	122347862	0	0
412	122347910	1	0
413	122374963	0	0
414	122375011	1	0
415	122936939	0	0
416	122936987	1	0
417	122982905	0	0
418	122982953	1	0
419	123003351	0	0
420	123003399	1	0
421	123600527	0	0
422	123600575	1	0
423	123667613	0	0
424	123667661	1	0
425	124235859	0	0
426	124235907	1	0
427	124792445	0	0
428	124792493	1	0
429	124865251	0	0
430	124865299	1	0
431	125584032	0	0
432	125584080	1	0
433	126136273	0	0
434	126136321	1	0
435	126203909	0	0
436	126203957	1	0
437	126780515	0	0
438	126780563	1	0
439	126787486	0	0
440	126787534	1	0
441	126868322	0	0
442	126868370	1	0
443	127460603	0	0
444	127460651	1	0
445	127527084	0	0
446	127527132	1	0
447	127983570	0	0
448	127983618	1	0
449	128092621	0	0
450	128092669	1	0
451	128720542	0	0
452	128720590	1	0
453	128789773	0	0
454	128789821	1	0
455	128796799	0	0
456	128796847	1	0
457	128810370	0	0
458	128810418	1	0
459	129370036	0	0
460	129370084	1	0
461	130079027	0	0
462	130079075	1	0
463	130085778	0	0
464	130085826	1	0
465	130679214	0	0
466	130679262	1	0
467	130713685	0	0
468	130713733	1	0
469	131287871	0	0
470	131287919	1	0
471	131294677	0	0
472	131294725	1	0
473	132080778	0	0
474	132080826	1	0
475	132570429	0	0
476	132570477	1	0
477	132596045	0	0
478	132596093	1	0
479	133233206	0	0
480	133233254	1	0
481	134532237	0	0
482	134532285	1	0
483	134545423	0	0
484	134545471	1	0
485	134584899	0	0
486	134584947	1	0
487	135138405	0	0
488	135138453	1	0
489	135779306	0	0
490	135779354	1	0
491	135825987	0	0
492	135826035	1	0
493	135867993	0	0
494	135868041	1	0
495	136414184	0	0
496	136414232	1	0
497	136460590	0	0
498	136460638	1	0
499	136494346	0	0
500	136494394	1	0
501	137120892	0	0
502	137120940	1	0
503	137709598	0	0
504	137709646	1	0
505	138428654	0	0
506	138428702	1	0
507	138743405	0	0
508	138743453	1	0
509	138991716	0	0
510	138991764	1	0
511	139017882	0	0
512	139017930	1	0
513	139038328	0	0
514	139038376	1	0
515	139698919	0	0
516	139698967	1	0
517	139705505	0	0
518	139705553	1	0
519	139725126	0	0
520	139725174	1	0
521	140328682	0	0
522	140328730	1	0
523	140965733	0	0
524	140965781	1	0
525	140972374	0	0
526	140972422	1	0
527	141615310	0	0
528	141615358	1	0
529	141743281	0	0
530	141743329	1	0
531	142197127	0	0
532	142197175	1	0
533	142291988	0	0
534	142292036	1	0
535	142836089	0	0
536	142836137	1	0
537	142870285	0	0
538	142870333	1	0
539	142890786	0	0
540	142890834	1	0
541	143536197	0	0
542	143536245	1	0
543	143542948	0	0
544	143542996	1	0
545	144123019	0	0
546	144123067	1	0
547	144129605	0	0
548	144129653	1	0
549	144155826	0	0
550	144155874	1	0
551	144769062	0	0
552	144769110	1	0
553	145491858	0	0
554	145491906	1	0
555	146070939	0	0
556	146070987	1	0
557	146701445	0	0
558	146701493	1	0
559	146734926	0	0
560	146734974	1	0
561	146808502	0	0
562	146808550	1	0
563	147522498	0	0
564	147522546	1	0
565	147845389	0	0
566	147852257	1	0
567	148009770	0	0
568	148009818	1	0
569	148023011	0	0
570	148023059	1	0
571	148029762	0	0
572	148029810	1	0
573	148043388	0	0
574	148043436	1	0
575	148077969	0	0
576	148078017	1	0
577	148679380	0	0
578	148679428	1	0
579	148686461	0	0
580	148686509	1	0
581	149048567	0	0
582	149048615	1	0
583	149277683	0	0
584	149277731	1	0
585	149359784	0	0
586	149359832	1	0
587	149373905	0	0
588	149373953	1	0
589	149911241	0	0
590	149911289	1	0
591	150569082	0	0
592	150569130	1	0
593	151227143	0	0
594	151227191	1	0
595	151367379	0	0
596	151367427	1	0
597	151883760	0	0
598	151883808	1	0
599	151916306	0	0
600	151916354	1	0
601	151922727	0	0
602	151922775	1	0
603	151929203	0	0
604	151929251	1	0
605	152549974	0	0
606	152550022	1	0
607	153068225	0	0
608	153068273	1	0
609	153226171	0	0
610	153226219	1	0
611	153834402	0	0
612	153834450	1	0
613	153840933	0	0
614	153840981	1	0
615	153860499	0	0
616	153860547	1	0
617	154269025	0	0
618	154275618	1	0
619	154491486	0	0
620	154491534	1	0
621	155052747	0	0
622	155052795	1	0
623	155108613	0	0
624	155108661	1	0
625	155716349	0	0
626	155716397	1	0
627	156399325	0	0
628	156399373	1	0
629	157046606	0	0
630	157046654	1	0
631	157059627	0	0
632	157059675	1	0
633	157724123	0	0
634	157724171	1	0
635	158307769	0	0
636	158307817	1	0
637	158314630	0	0
638	158314678	1	0
639	159562291	0	0
640	159562339	1	0
641	159621512	0	0
642	159621560	1	0
643	160206038	0	0
644	160206086	1	0
645	160212459	0	0
646	160212507	1	0
647	160856605	0	0
648	160856653	1	0
649	161479576	0	0
650	161479624	1	0
651	161500352	0	0
652	161500400	1	0
653	162168973	0	0
654	162169021	1	0
655	162182819	0	0
656	162182867	1	0
657	162749140	0	0
658	162749188	1	0
659	162769201	0	0
660	162769249	1	0
661	162790142	0	0
662	162790190	1	0
663	162824173	0	0
664	162824221	1	0
665	163159109	0	0
666	163159157	1	0
667	164042835	0	0
668	164042883	1	0
669	164056296	0	0
670	164056344	1	0
671	164063322	0	0
672	164063370	1	0
673	164137338	0	0
674	164137386	1	0
675	164144364	0	0
676	164144412	1	0
677	164151225	0	0
678	164151273	1	0
679	164745321	0	0
680	164745369	1	0
681	164758892	0	0
682	164758940	1	0
683	164772738	0	0
684	164772786	1	0
685	165336034	0	0
686	165336082	1	0
687	165342675	0	0
688	165342723	1	0
689	165369831	0	0
690	165369879	1	0
691	165383127	0	0
692	165383175	1	0
693	165410448	0	0
694	165410496	1	0
695	165417364	0	0
696	165417412	1	0
697	166020150	0	0
698	166020198	1	0
699	166033006	0	0
700	166033054	1	0
701	167256357	0	0
702	167256405	1	0
703	167263218	0	0
704	167263266	1	0
705	167322714	0	0
706	167322762	1	0
707	167335845	0	0
708	167335893	1	0
709	167899691	0	0
710	167899739	1	0
711	169228697	0	0
712	169228745	1	0
713	169282363	0	0
714	169282411	1	0
715	169592109	0	0
716	169592157	1	0
717	169903835	0	0
718	169903883	1	0
719	171126416	0	0
720	171126464	1	0
721	171193667	0	0
722	171193715	1	0
723	171221043	0	0
724	171221091	1	0
725	171812059	0	0
726	171812107	1	0
727	172388830	0	0
728	172388878	1	0
729	172428691	0	0
730	172428739	1	0
731	172461622	0	0
732	172461670	1	0
733	173072108	0	0
734	173072156	1	0
735	173124674	0	0
736	173124722	1	0
737	173131590	0	0
738	173131638	1	0
739	173746091	0	0
740	173746139	1	0
741	175610412	0	0
742	175610460	1	0
743	175664738	0	0
744	175664786	1	0
745	175677979	0	0
746	175678027	1	0
747	176243640	0	0
748	176243688	1	0
749	176250391	0	0
750	176250439	1	0
751	176269792	0	0
752	176269840	1	0
753	176316473	0	0
754	176316521	1	0
755	178236014	0	0
756	178236062	1	0
757	178255910	0	0
758	178255958	1	0
759	178357976	0	0
760	178358024	1	0
761	178825517	0	0
762	178825565	1	0
763	179474393	0	0
764	179474441	1	0
765	179481199	0	0
766	179481247	1	0
767	179528650	0	0
768	179528698	1	0
769	180058396	0	0
770	180058444	1	0
771	180139287	0	0
772	180139335	1	0
773	180198068	0	0
774	180198116	1	0
775	180806629	0	0
776	180806677	1	0
777	180813435	0	0
778	180813483	1	0
779	181452521	0	0
780	181452569	1	0
781	181493482	0	0
782	181493530	1	0
783	182086753	0	0
784	182086801	1	0
785	182106319	0	0
786	182106367	1	0
787	182125940	0	0
788	182125988	1	0
789	182725976	0	0
790	182726024	1	0
791	183323977	0	0
792	183324025	1	0
793	183966308	0	0
794	183966356	1	0
795	185295644	0	0
796	185295692	1	0
797	185328960	0	0
798	185329008	1	0
799	185355566	0	0
800	185355614	1	0
801	186007467	0	0
802	186007515	1	0
803	186599033	0	0
804	186599081	1	0
805	186612439	0	0
806	186612487	1	0
807	186619410	0	0
808	186619458	1	0
809	187284456	0	0
810	187284504	1	0
811	188467602	0	0
812	188467650	1	0
813	188487498	0	0
814	188487546	1	0
815	188528074	0	0
816	188528122	1	0
817	188895295	0	0
818	188895343	1	0
819	189200311	0	0
820	189200359	1	0
821	189207007	0	0
822	189207055	1	0
823	189768103	0	0
824	189768151	1	0
825	189794379	0	0
826	189794427	1	0
827	189846340	0	0
828	189846388	1	0
829	190152456	0	0
830	190152504	1	0
831	190165532	0	0
832	190165580	1	0
833	190436668	0	0
834	190436716	1	0
835	191101824	0	0
836	191101872	1	0
837	191450730	0	0
838	191450778	1	0
839	191720711	0	0
840	191720759	1	0
841	192303147	0	0
842	192303195	1	0
843	192412803	0	0
844	192412851	1	0
845	193013554	0	0
846	193013602	1	0
847	193595990	0	0
848	193596038	1	0
849	194957226	0	0
850	194957274	1	0
851	197483032	0	0
852	197483080	1	0
853	197515963	0	0
854	197516011	1	0
855	197529369	0	0
856	197529417	1	0
857	197549100	0	0
858	197549148	1	0
859	198094851	0	0
860	198094899	1	0
861	198162377	0	0
862	198162425	1	0
863	198744208	0	0
864	198744256	1	0
865	198803704	0	0
866	198803752	1	0
867	198810235	0	0
868	198810283	1	0
869	199331621	0	0
870	199331669	1	0
871	199392327	0	0
872	199392375	1	0
873	199405568	0	0
874	199405616	1	0
875	199486734	0	0
876	199486782	1	0
877	200121145	0	0
878	200121193	1	0
879	200672726	0	0
880	200672774	1	0
881	200706922	0	0
882	200706970	1	0
883	200727203	0	0
884	200727251	1	0
885	200826244	0	0
886	200826292	1	0
887	201265350	0	0
888	201775853	1	0
889	201815006	1	1
890	201857414	0	1
891	201896292	0	0
892	201933640	1	0
893	201968943	1	1
894	202000571	0	1
895	202029604	0	0
896	202060022	1	0
897	202083610	1	1
898	202106768	0	1
899	202129751	0	0
900	202150764	1	0
901	202173197	1	1
902	202193715	0	1
903	202214828	0	0
904	202244641	1	0
905	202256349	1	1
906	202276977	0	1
907	202299410	0	0
908	202345833	1	1
909	202370246	0	1
910	202394989	0	0
911	202420072	1	0
912	202444760	1	1
913	202469018	0	1
914	202494091	0	0
915	202521979	1	0
916	202540562	1	1
917	202562455	0	1
918	202585218	0	0
919	202607496	1	0
920	202629764	1	1
921	202652537	0	1
922	202675465	0	0
923	202703463	1	0
924	202721551	1	1
925	202744269	0	1
926	202767307	0	0
927	202790245	1	0
928	202810973	1	1
929	202831931	0	1
930	202852439	0	0
931	202871637	1	0
932	202891430	1	1
933	202910353	0	1
934	202929156	0	0
935	202948024	1	0
936	202966662	1	1
937	202984870	0	1
938	203003948	0	0
939	203022541	1	0
940	203041289	1	1
941	203059662	0	1
942	203079015	0	0
943	203099918	1	0
944	203116906	1	1
945	203135664	0	1
946	203155017	0	0
947	203173225	1	0
948	203192083	1	1
949	203210236	0	1
950	203228269	0	0
951	203246092	1	0
952	203264345	1	1
953	203281728	0	1
954	203299431	0	0
955	203322974	1	0
956	203334407	1	1
957	203351570	0	1
958	203369603	0	0
959	203386986	1	0
960	203405074	1	1
961	203422512	0	1
962	203440710	0	0
963	203458368	1	0
964	203475686	1	1
965	203493234	0	1
966	203510772	0	0
967	203542620	1	0
968	203544813	1	1
969	203561866	0	1
970	203579404	0	0
971	203595632	1	0
972	203612510	1	1
973	203628133	0	1
974	203644241	0	0
975	203660524	1	0
976	203676412	1	1
977	203692035	0	1
978	203708143	0	0
979	203727781	1	0
980	203740424	1	1
981	203756102	0	1
982	203772320	0	0
983	203788878	1	0
984	203805096	1	1
985	203821269	0	1
986	203838202	0	0
987	203854375	1	0
988	203870923	1	1
989	203887371	0	1
990	203904249	0	0
991	203920807	1	0
992	203937685	1	1
993	203954518	0	1
994	203971671	0	0
995	203989164	1	0
996	204006372	1	1
997	204022930	0	1
998	204040853	0	0
999	204059831	1	0
1000	204075389	1	1
1001	204092772	0	1
1002	204110255	0	0
1003	204127693	1	0
1004	204144626	1	1
1005	204161899	0	1
1006	204179437	0	0
1007	204196050	1	0
1008	204212983	1	1
1009	204230421	0	1
1010	204247189	0	0
1011	204263637	1	0
1012	204280735	1	1
1013	204296468	0	1
1014	204312796	0	0
1015	204329134	1	0
1016	204345462	1	1
1017	204361085	0	1
1018	204377303	0	0
1019	204393091	1	0
1020	204409309	1	1
1021	204424822	0	1
1022	204440985	0	0
1023	204456663	1	0
1024	204472716	1	1
1025	204488779	0	1
1026	204504777	0	0
1027	204520290	1	0
1028	204536343	1	1
1029	204551746	0	1
1030	204567799	0	0
1031	204584027	1	0
1032	204600245	1	1
1033	204616198	0	1
1034	204632746	0	0
1035	204648864	1	0
1036	204665522	1	1
1037	204681640	0	1
1038	204698298	0	0
1039	204714691	1	0
1040	204731624	1	1
1041	204748402	0	1
1042	204765665	0	0
1043	204782938	1	0
1044	204800421	1	1
1045	204817584	0	1
1046	204835507	0	0
1047	204852945	1	0
1048	204870703	1	1
1049	204888251	0	1
1050	204906669	0	0
1051	204924382	1	0
1052	204942305	1	1
1053	204959798	0	1
1054	204977611	0	0
1055	204995324	1	0
1056	205013027	1	1
1057	205030355	0	1
1058	205048278	0	0
1059	205068906	1	0
1060	205084024	1	1
1061	205101187	0	1
1062	205118945	0	0
1063	205136383	1	0
1064	205154196	1	1
1065	205171634	0	1
1066	205189337	0	0
1067	205208700	1	0
1068	205224808	1	1
1069	205242191	0	1
1070	205260499	0	0
1071	205278267	1	0
1072	205296410	1	1
1073	205314178	0	1
1074	205332816	0	0
1075	205355534	1	0
1076	205368837	1	1
1077	205387100	0	1
1078	205406123	0	0
1079	205444131	1	1
1080	205463264	0	1
1081	205482672	0	0
1082	205501540	1	0
1083	205521113	1	1
1084	205539926	0	1
1085	205560049	0	0
1086	205580182	1	0
1087	205599095	1	1
1088	205619063	0	1
1089	205639626	0	0
1090	205660034	1	0
1091	205680542	1	1
1092	205701115	0	1
1093	205722338	0	0
1094	205743846	1	0
1095	205764959	1	1
1096	205785367	0	1
1097	205808130	0	0
1098	205829198	1	0
1099	205851466	1	1
1100	205873524	0	1
1101	205896562	0	0
1102	205918785	1	0
1103	205943143	1	1
1104	205966081	0	1
1105	205991264	0	0
1106	206016182	1	0
1107	206041420	1	1
1108	206068648	0	1
1109	206095976	0	0
1110	206124084	1	0
1111	206151742	1	1
1112	206180895	0	1
1113	206209488	0	0
1114	206240181	1	0
1115	206272184	1	1
1116	206304582	0	1
1117	206337245	0	0
1118	206372338	1	0
1119	206408686	1	1
1120	206446309	0	1
1121	206485572	0	0
1122	206524955	1	0
1123	206569003	1	1
1124	206615481	0	1
1125	206668219	0	0
1126	206728227	1	0
1127	206795760	1	1
1128	206881673	0	1
1129	207369406	1	1
1130	207445409	1	0
1131	207520047	0	0
1132	207629105	0	1
1133	207829308	1	1
1134	207905421	1	0
1135	208181579	1	1
1136	208243127	1	0
1137	208366825	1	1
1138	208478423	0	1
1139	208554976	0	0
1140	208773989	1	0
1141	208869682	1	1
1142	208995745	0	1
1143	209195278	0	0
1144	209310781	1	0
1145	209550134	1	1
1146	210171362	1	0
1147	210328390	0	0
1148	210493218	0	1
1149	210601186	1	1
1150	210730814	1	0
1151	210862322	0	0
1152	210966045	0	1
1153	210972648	0	0
1154	210972706	0	1
1155	211084414	1	1
1156	211226692	1	0
1157	211328830	0	0
1158	211456753	0	1
1159	211618896	1	1
1160	211773934	1	0
1161	212015167	0	0
1162	212334985	0	1
1163	212574348	1	1
1164	212788786	1	0
1165	212875249	0	0
1166	212956147	0	1
1167	213042445	1	1
1168	213130493	1	0
1169	213196166	0	0
1170	213255834	0	1
1171	213305832	1	1
1172	213361870	1	0
1173	213414178	0	0
1174	213465926	0	1
1175	213517134	1	1
1176	213561017	1	0
1177	213600785	0	0
1178	213641313	0	1
1179	213683171	1	1
1180	213723754	1	0
1181	213764402	0	0
1182	213846290	1	1
1183	213885388	1	0
1184	213922296	0	0
1185	213959084	0	1
1186	213996377	1	1
1187	214035035	1	0
1188	214074748	0	0
1189	214115276	0	1
1190	214155594	1	1
1191	214195792	1	0
1192	214237375	0	0
1193	214278728	0	1
1194	214317946	1	1
1195	214362434	1	0
1196	214408582	0	0
1197	214456315	0	1
1198	214504058	1	1
1199	214556411	1	0
1200	214611964	0	0
1201	214671082	0	1
1202	214731420	1	1
1203	214803023	1	0
1204	214878541	0	0
1205	214984024	0	1
1206	215504712	0	0
1207	215648815	1	0
1208	215762273	1	1
1209	215864026	0	1
1210	215960214	0	0
1211	216053387	1	0
1212	216097215	0	0
1213	216097263	1	0
1214	216104021	0	0
1215	216104069	1	0
1216	216143882	1	1
1217	216299370	1	0
1218	216452218	0	0
1219	216699051	0	1
1220	216737884	0	0
1221	216737942	0	1
1222	216751090	0	0
1223	216757858	0	1
1224	216809836	1	1
1225	216950244	1	0
1226	217052327	0	0
1227	217121840	0	1
1228	217184213	1	1
1229	217262471	1	0
1230	217350309	0	0
1231	217431317	0	1
1232	217491600	1	1
1233	217551048	1	0
1234	217624476	0	0
1235	217707794	0	1
1236	217790682	1	1
1237	217860140	1	0
1238	217930873	0	0
1239	218017051	0	1
1240	218094109	1	1
1241	218164117	1	0
1242	218226655	0	0
1243	218325978	0	1
1244	218365086	1	1
1245	218443949	1	0
1246	218511547	0	0
1247	218575505	0	1
1248	218639308	1	1
1249	218709206	1	0
1250	218784889	0	0
1251	218858087	0	1
1252	218922385	1	1
1253	219012798	1	0
1254	219075666	0	0
1255	219143529	0	1
1256	219181537	1	1
1257	219244725	1	0
1258	219304128	0	0
1259	219389261	0	1
1260	219463624	1	1
1261	219533137	1	0
1262	219622955	0	0
1263	219804448	0	1
1264	219928696	1	1
1265	220190489	1	0
1266	221255897	1	1
1267	221506975	0	1
1268	221703978	0	0
1269	221932396	1	0
1270	222077919	1	1
1271	222260357	0	1
1272	222387345	0	0
1273	222517918	1	0
1274	222644246	1	1
1275	222754689	0	1
1276	222883327	0	0
1277	223013625	1	0
1278	223132528	1	1
1279	223250011	0	1
1280	223375514	0	0
1281	223500257	1	0
1282	223611680	1	1
1283	223728338	0	1
1284	223809126	0	0
1285	223809184	0	1
1286	223855882	0	0
1287	223959230	1	0
1288	224085063	1	1
1289	224227296	0	1
1290	224342734	0	0
1291	224476717	1	0
1292	224616850	1	1
1293	224739613	0	1
1294	224884586	0	0
1295	225013949	1	0
1296	225137912	1	1
1297	225271730	0	1
1298	225419013	0	0
1299	225571146	1	0
1300	225729209	1	1
1301	225907137	0	1
1302	226136755	0	0
1303	226347023	1	0
1304	226367476	0	0
1305	226367524	1	0
1306	226413497	0	0
1307	226413545	1	0
1308	226420138	0	0
1309	226420186	1	0
1310	226433269	0	0
1311	226433317	1	0
1312	226440020	0	0
1313	226440068	1	0
1314	226673096	1	1
1315	228030114	1	0
1316	228325467	0	0
1317	228325515	1	0
1318	228477143	0	0
1319	229031756	1	0
1320	229324019	1	1
1321	229524002	0	1
1322	229643455	0	0
1323	229650278	0	1
1324	229650336	0	0
1325	229657324	0	1
1326	229657382	0	0
1327	229664205	0	1
1328	229712388	0	0
1329	229902581	1	0
1330	230058444	1	1
1331	230215967	0	1
1332	230402575	0	0
1333	230622468	1	0
1334	230919791	1	1
1335	232674514	1	0
1336	232838472	0	0
1337	232838520	1	0
1338	232845278	0	0
1339	232845326	1	0
1340	232852139	0	0
1341	232852187	1	0
1342	233120195	0	0
1343	233516078	0	1
1344	233904106	1	1
1345	234324959	1	0
1346	234690657	0	0
1347	235103150	0	1
1348	235414783	1	1
1349	235862751	1	0
1350	236072249	0	0
1351	236072297	1	0
1352	236349215	0	0
1353	238475288	0	1
1354	240503856	0	0
1355	251801629	1	0
1356	254653922	0	0
1357	254653970	1	0
1358	255282778	0	0
1359	255282826	1	0
1360	256592094	0	0
1361	256592142	1	0
1362	256611660	0	0
1363	256611708	1	0
1364	257844966	0	0
1365	257845014	1	0
1366	258538777	0	0
1367	258538825	1	0
1368	258552238	0	0
1369	258552286	1	0
1370	259814529	0	0
1371	259814577	1	0
1372	261721145	0	0
1373	261721193	1	0
1374	261755726	0	0
1375	261755774	1	0
1376	263050907	0	0
1377	263050955	1	0
1378	264271563	0	0
1379	264271611	1	0
1380	264284859	0	0
1381	264284907	1	0
1382	264921250	0	0
1383	264921298	1	0
1384	264948131	0	0
1385	264948179	1	0
1386	264988102	0	0
1387	264988150	1	0
1388	265610303	0	0
1389	265610351	1	0
1390	266868964	0	0
1391	266869012	1	0
1392	268166235	0	0
1393	268166283	1	0
1394	269440021	0	0
1395	269440069	1	0
1396	270117002	0	0
1397	270117050	1	0
1398	270723528	0	0
1399	270723576	1	0
1400	270744084	0	0
1401	270744132	1	0
1402	271390265	0	0
1403	271390313	1	0
1404	275830951	1	1
1405	333596959	0	1
1406	413381987	0	0
1407	552654585	0	1

Lines 907 - 908, 1078 - 1079 and 1181 - 1182 still have that irregularity. Plus, the output now has a lot of jitter at the beginning of the data stream and in its tail end. I suppose that may be from the sensor (a US digital encoder clone, i think) cos i saw something like that a few times while working with the arduino IDE. I repeated the run once and only got the tail end jitter in the second trial.

4

Also tried removing UARTE0_UART0_IRQn and UARTE1_IRQn by placing

NVIC_DisableIRQ(UARTE1_IRQn);
NVIC_DisableIRQ(UARTE0_UART0_IRQn);

before the loop and placing

NVIC_EnableIRQ(UARTE1_IRQn);
NVIC_EnableIRQ(UARTE0_UART0_IRQn);

after the loop. Got the data below instead.

1	0	0	0
2	193397	1	0
3	48525142	0	0
4	48525193	1	0
5	62593434	0	0
6	62593485	1	0
7	76013518	0	0
8	76013569	1	0
9	79202692	0	0
10	79202743	1	0
11	88153006	0	0
12	88153057	1	0
13	88173292	0	0
14	88173343	1	0
15	88803680	0	0
16	88803731	1	0
17	90053160	0	0
18	90053211	1	0
19	90121122	0	0
20	90121173	1	0
21	90713230	0	0
22	90713281	1	0
23	91351796	0	0
24	91351847	1	0
25	91399400	0	0
26	91399451	1	0
27	91996728	0	0
28	91996779	1	0
29	92016724	0	0
30	92016775	1	0
31	92643980	0	0
32	92644031	1	0
33	92676794	0	0
34	92676845	1	0
35	93906844	0	0
36	93906895	1	0
37	93919706	0	0
38	93919757	1	0
39	93926652	0	0
40	93926703	1	0
41	94579486	0	0
42	94579537	1	0
43	94606326	0	0
44	94606377	1	0
45	95845134	0	0
46	95845185	1	0
47	95871336	0	0
48	95871387	1	0
49	96502594	0	0
50	96502645	1	0
51	97122658	0	0
52	97122709	1	0
53	97129488	0	0
54	97129539	1	0
55	97136434	0	0
56	97136485	1	0
57	98394266	0	0
58	98394317	1	0
59	99681388	0	0
60	99681439	1	0
61	100342458	0	0
62	100342509	1	0
63	100951328	0	0
64	100951379	1	0
65	100965292	0	0
66	100965343	1	0
67	102901898	0	0
68	102901949	1	0
69	106060216	0	0
70	106060267	1	0
71	106066872	0	0
72	106066923	1	0
73	106086926	0	0
74	106086977	1	0
75	106107096	0	0
76	106107147	1	0
77	106700770	0	0
78	106700821	1	0
79	107329824	0	0
80	107329875	1	0
81	107377196	0	0
82	107377247	1	0
83	107980904	0	0
84	107980955	1	0
85	108022012	0	0
86	108022063	1	0
87	108616382	0	0
88	108616433	1	0
89	109247698	0	0
90	109247749	1	0
91	109914800	0	0
92	109914851	1	0
93	111194730	0	0
94	111194781	1	0
95	111802382	0	0
96	111802433	1	0
97	111815592	0	0
98	111815643	1	0
99	113104570	0	0
100	113104621	1	0
101	115010552	0	0
102	115010603	1	0
103	115037218	0	0
104	115037269	1	0
105	117604864	0	0
106	117604915	1	0
107	118246678	0	0
108	118246729	1	0
109	118893132	0	0
110	118893183	1	0
111	119509774	0	0
112	119509825	1	0
113	119523100	0	0
114	119523151	1	0
115	119529582	0	0
116	119529633	1	0
117	120138452	0	0
118	120138503	1	0
119	120165582	0	0
120	120165633	1	0
121	123326220	0	0
122	123326271	1	0
123	123333108	0	0
124	123333159	1	0
125	125263334	0	0
126	125263385	1	0
127	125270338	0	0
128	125270389	1	0
129	125896840	0	0
130	125896891	1	0
131	125910572	0	0
132	125910623	1	0
133	126529128	0	0
134	126529179	1	0
135	127804766	0	0
136	127804817	1	0
137	127837986	0	0
138	127838037	1	0
139	129100052	0	0
140	129100103	1	0
141	129735254	0	0
142	129735305	1	0
143	129781872	0	0
144	129781923	1	0
145	130378562	0	0
146	130378613	1	0
147	130391888	0	0
148	130391939	1	0
149	131712186	0	0
150	131712237	1	0
151	132287300	0	0
152	132287351	1	0
153	132327132	0	0
154	132327183	1	0
155	132915006	0	0
156	132915057	1	0
157	132976298	0	0
158	132976349	1	0
159	133577802	0	0
160	133577853	1	0
161	134864634	0	0
162	134864685	1	0
163	135487250	0	0
164	135487301	1	0
165	135493964	0	0
166	135494015	1	0
167	136123772	0	0
168	136123823	1	0
169	136769820	0	0
170	136769871	1	0
171	137458788	0	0
172	137458839	1	0
173	137465618	0	0
174	137465669	1	0
175	138040616	0	0
176	138040667	1	0
177	138047214	0	0
178	138047265	1	0
179	138464046	0	0
180	139073155	1	0
181	139487094	1	1
182	139533149	0	1
183	139597638	0	0
184	139707493	1	0
185	139713808	1	1
186	139751743	0	1
187	139783984	0	0
188	139812233	1	0
189	139838674	1	1
190	139865067	0	1
191	139890522	0	0
192	139917031	1	0
193	139943878	1	1
194	139970329	0	1
195	139995262	0	0
196	140019567	1	0
197	140043224	1	1
198	140065383	0	1
199	140088460	0	0
200	140109807	1	0
201	140129694	1	1
202	140148895	0	1
203	140168086	0	0
204	140204107	1	0
205	140205550	1	1
206	140223881	0	1
207	140241738	0	0
208	140278397	1	1
209	140296602	0	1
210	140315503	0	0
211	140334762	1	0
212	140354939	1	1
213	140375184	0	1
214	140397565	0	0
215	140426220	1	0
216	140442221	1	1
217	140464960	0	1
218	140488733	0	0
219	140512864	1	0
220	140536057	1	1
221	140557346	0	1
222	140579669	0	0
223	140603800	1	0
224	140623803	1	1
225	140645382	0	1
226	140667241	0	0
227	140693808	1	0
228	140710505	1	1
229	140732142	0	1
230	140754001	0	0
231	140774652	1	0
232	140796163	1	1
233	140816350	0	1
234	140837049	0	0
235	140856308	1	0
236	140875267	1	1
237	140893424	0	1
238	140911281	0	0
239	140928220	1	0
240	140945091	1	1
241	140960986	0	1
242	140976987	0	0
243	140992534	1	0
244	141008129	1	1
245	141023212	0	1
246	141039097	0	0
247	141054702	1	0
248	141070297	1	1
249	141085612	0	1
250	141101729	0	0
251	141117798	1	0
252	141133857	1	1
253	141149694	0	1
254	141166449	0	0
255	141182750	1	0
256	141199041	1	1
257	141214936	0	1
258	141231633	0	0
259	141247586	1	0
260	141263413	1	1
261	141279076	0	1
262	141295425	0	0
263	141311088	1	0
264	141326915	1	1
265	141342520	0	1
266	141358463	0	0
267	141380448	1	0
268	141389779	1	1
269	141405268	0	1
270	141421327	0	0
271	141436758	1	0
272	141452585	1	1
273	141468596	0	1
274	141485003	0	0
275	141500956	1	0
276	141517479	1	1
277	141533838	0	1
278	141550593	0	0
279	141566430	1	0
280	141583011	1	1
281	141598964	0	1
282	141615197	0	0
283	141631730	1	0
284	141648137	1	1
285	141664148	0	1
286	141680729	0	0
287	141696682	1	0
288	141713437	1	1
289	141729564	0	1
290	141745797	0	0
291	141762678	1	0
292	141779607	1	1
293	141796198	0	1
294	141813069	0	0
295	141829892	1	0
296	141847169	1	1
297	141863470	0	1
298	141880747	0	0
299	141897222	1	0
300	141913397	1	1
301	141929582	0	1
302	141946163	0	0
303	141962464	1	0
304	141978523	1	1
305	141993954	0	1
306	142010129	0	0
307	142027242	1	0
308	142040749	1	1
309	142055542	0	1
310	142070847	0	0
311	142100662	1	1
312	142115039	0	1
313	142130170	0	0
314	142158999	1	1
315	142173782	0	1
316	142188797	0	0
317	142203242	1	0
318	142222491	1	1
319	142232006	0	1
320	142246963	0	0
321	142271616	1	0
322	142277873	1	1
323	142290404	0	1
324	142305593	0	0
325	142320154	1	0
326	142335053	1	1
327	142349556	0	1
328	142364977	0	0
329	142379886	1	0
330	142394727	1	1
331	142409752	0	1
332	142425521	0	0
333	142447042	1	0
334	142455851	1	1
335	142470934	0	1
336	142486587	0	0
337	142502192	1	0
338	142517671	1	1
339	142532928	0	1
340	142548697	0	0
341	142564244	1	0
342	142580361	1	1
343	142595792	0	1
344	142612025	0	0
345	142627746	1	0
346	142643979	1	1
347	142660396	0	1
348	142676919	0	0
349	142693220	1	0
350	142710207	1	1
351	142726740	0	1
352	142744017	0	0
353	142760608	1	0
354	142777537	1	1
355	142794940	0	1
356	142812101	0	0
357	142828750	1	0
358	142846317	1	1
359	142862618	0	1
360	142879605	0	0
361	142896660	1	0
362	142912893	1	1
363	142928904	0	1
364	142945311	0	0
365	142963294	1	0
366	142978889	1	1
367	142995074	0	1
368	143012409	0	0
369	143029464	1	0
370	143046915	1	1
371	143063912	0	1
372	143081943	0	0
373	143099984	1	0
374	143118015	1	1
375	143136230	0	1
376	143155131	0	0
377	143173346	1	0
378	143191957	1	1
379	143210578	0	1
380	143229537	0	0
381	143253436	1	0
382	143266885	1	1
383	143285622	0	1
384	143304407	0	0
385	143327900	1	0
386	143342161	1	1
387	143360434	0	1
388	143379683	0	0
389	143398826	1	0
390	143418481	1	1
391	143437856	0	1
392	143458381	0	0
393	143478510	1	0
394	143498977	1	1
395	143519570	0	1
396	143541081	0	0
397	143562544	1	0
398	143583533	1	1
399	143604358	0	1
400	143625463	0	0
401	143649072	1	0
402	143667741	1	1
403	143688740	0	1
404	143711353	0	0
405	143732410	1	0
406	143753399	1	1
407	143776370	0	1
408	143798519	0	0
409	143822070	1	0
410	143847235	1	1
411	143870148	0	1
412	143897517	0	0
413	143921300	1	0
414	143948727	1	1
415	143975294	0	1
416	144003011	0	0
417	144030796	1	0
418	144059325	1	1
419	144088212	0	1
420	144117147	0	0
421	144150036	1	0
422	144182509	1	1
423	144214934	0	1
424	144250307	0	0
425	144285922	1	0
426	144329647	1	1
427	144372338	0	1
428	144424821	0	0
429	144488624	1	0
430	144572891	1	1
431	144699334	0	1
432	144921293	1	1
433	145045522	1	0
434	145123767	0	0
435	145212848	0	1
436	145472633	1	1
437	145641174	1	0
438	145670467	1	1
439	146156336	0	1
440	146316699	0	0
441	146390884	1	0
442	146390935	0	0
443	146390986	1	0
444	146424735	0	0
445	146424786	1	0
446	146447167	1	1
447	146502676	0	1
448	146564497	0	0
449	146652834	1	0
450	146725501	1	1
451	146790754	0	1
452	146861681	0	0
453	146954310	1	0
454	147089849	1	1
455	147187640	0	1
456	147296847	0	0
457	147453392	1	0
458	147598269	1	1
459	148143994	1	0
460	148297697	0	0
461	148297748	1	0
462	148402025	0	0
463	148661336	1	1
464	148781737	1	0
465	148877266	0	0
466	148971567	0	1
467	149078116	1	1
468	149170271	1	0
469	149252576	0	0
470	149338525	0	1
471	149447394	1	1
472	149536533	1	0
473	149564956	0	0
474	149565007	1	0
475	149571786	0	0
476	149571837	1	0
477	149608602	0	0
478	149683009	0	1
479	149763806	1	1
480	149841403	1	0
481	149908338	0	0
482	149974335	0	1
483	150036688	1	1
484	150124319	1	0
485	150184990	0	0
486	150185041	1	0
487	150218152	0	0
488	150291979	0	1
489	150366744	1	1
490	150457043	1	0
491	150568174	0	0
492	150677033	0	1
493	150853820	1	1
494	150973989	1	0
495	151084540	0	0
496	151228257	0	1
497	151304414	1	1
498	151390653	1	0
499	151497898	0	0
500	151574683	0	1
501	151637036	1	1
502	151691955	1	0
503	151741374	0	0
504	151798265	0	1
505	151851918	1	1
506	151900689	1	0
507	151948542	0	0
508	151992441	0	1
509	152032058	1	1
510	152074739	1	0
511	152116792	0	0
512	152170609	0	1
513	152228322	1	1
514	152263927	1	0
515	152296236	0	0
516	152327259	0	1
517	152348896	1	1
518	152383341	1	0
519	152407240	0	0
520	152435131	0	1
521	152470456	1	1
522	152507859	1	0
523	152533440	0	0
524	152558257	0	1
525	152598802	1	1
526	152639047	1	0
527	152662540	0	0
528	152687589	0	1
529	152712706	1	1
530	152741409	1	0
531	152781954	0	0
532	152821445	0	1
533	152850390	1	1
534	152891737	1	0
535	152952408	0	0
536	153022929	0	1
537	153036156	1	1
538	153079649	1	0
539	153125646	0	0
540	153162527	0	1
541	153199592	1	1
542	153292675	1	0
543	153425962	0	0
544	153426013	1	0
545	153432966	0	0
546	153433017	1	0
547	153549300	0	0
548	153647371	1	0
549	153779430	1	1
550	153898449	0	1
551	153985036	0	0
552	154037935	1	0
553	154088968	1	1
554	154141519	0	1
555	154199918	0	0
556	154324389	1	0
557	154700860	0	0
558	154700911	1	0
559	154788716	0	0
560	154957141	0	1
561	155016014	1	1
562	155097613	1	0
563	155166578	0	0
564	155221091	0	1
565	155281762	1	1
566	155362143	1	0
567	155452684	0	0
568	155613975	1	1
569	155696618	1	0
570	155801021	0	0
571	155906574	0	1
572	155981223	1	1
573	156049424	1	0
574	156118795	0	0
575	156189780	0	1
576	156253467	1	1
577	156318246	1	0
578	156378337	0	0
579	156437316	0	1
580	156503903	1	1
581	156571640	1	0
582	156637125	0	0
583	156710894	0	1
584	156767215	1	1
585	156827006	1	0
586	156886575	0	0
587	156945322	0	1
588	157014345	1	1
589	157077964	1	0
590	157162763	0	0
591	157245348	0	1
592	157283631	1	1
593	157345104	1	0
594	157406239	0	0
595	157551000	0	1
596	157581917	1	1
597	157658818	1	0
598	157722737	0	0
599	157831074	0	1
600	158044575	1	1
601	158162482	1	0
602	159006501	1	1
603	159223540	0	1
604	159508139	0	0
605	159753656	1	0
606	159893255	1	1
607	160101420	0	1
608	160244151	0	0
609	160375176	1	0
610	160482469	0	0
611	160482520	1	0
612	160488023	1	1
613	160586452	0	1
614	160695717	0	0
615	160817172	1	0
616	160923479	1	1
617	161018892	0	1
618	161115745	0	0
619	161219046	1	0
620	161319147	1	1
621	161414676	0	1
622	161523303	0	0
623	161626488	1	0
624	161717135	1	1
625	161799498	0	1
626	161895713	0	0
627	162006380	1	0
628	162110425	1	1
629	162214480	0	1
630	162324441	0	0
631	162425538	1	0
632	162522913	1	1
633	162630564	0	1
634	162766277	0	0
635	162884600	1	0
636	162992357	0	0
637	162992408	1	0
638	162998201	1	1
639	163113334	0	1
640	163235301	0	0
641	163375026	1	0
642	163524775	1	1
643	163661426	0	1
644	163810537	0	0
645	164031288	1	0
646	164291991	1	1
647	164988516	0	1
648	165275377	1	1
649	165954318	1	0
650	166400805	1	1
651	166642552	0	1
652	166818459	0	0
653	166943626	1	0
654	167068957	1	1
655	167193950	0	1
656	167323341	0	0
657	167449262	1	0
658	167567401	1	1
659	167694656	0	1
660	167849857	0	0
661	168025948	1	0
662	168217921	1	1
663	168448590	0	1
664	168771701	0	0
665	168771762	0	1
666	168785627	0	0
667	168785688	0	1
668	168908999	0	0
669	170426804	0	1
670	170930769	1	1
671	171244716	1	0
672	171521147	0	0
673	171759462	0	1
674	171954693	1	1
675	172183438	1	0
676	172392531	0	0
677	172596684	0	1
678	172811983	1	1
679	173038640	1	0
680	173244717	0	0
681	173493704	0	1
682	173731275	1	1
683	173954510	1	0
684	174199099	0	0
685	174430918	0	1
686	174664603	1	1
687	174963760	1	0
688	175379275	0	0
689	177800246	1	0
690	178332853	0	0
691	178332904	1	0
692	179401083	1	1
693	179983000	0	1
694	180281519	0	0
695	180281580	0	1
696	180295155	0	0
697	180301944	0	1
698	180322421	0	0
699	180328862	0	1
700	180474619	0	0
701	181119930	1	0
702	184176929	1	1
703	185557970	1	0
704	192457943	0	0
705	192457994	1	0
706	214190993	0	0
707	214191044	1	0
708	214197707	0	0
709	214197758	1	0
710	214958131	0	0
711	214958182	1	0
712	215472809	0	0
713	215472860	1	0
714	216082723	0	0
715	216082774	1	0
716	216096339	0	0
717	216096390	1	0
718	216729105	0	0
719	216729156	1	0
720	218049809	0	0
721	218049860	1	0
722	219293547	0	0
723	219293598	1	0
724	219931127	0	0
725	219931178	1	0
726	219951529	0	0
727	219951580	1	0
728	220071343	0	0
729	220071394	1	0
730	221218569	0	0
731	221218620	1	0
732	221990187	0	0
733	221990238	1	0
734	222644065	0	0
735	222644116	1	0
736	234678065	0	0
737	234678116	1	0
738	235979455	0	0
739	235979506	1	0
740	236594473	0	0
741	236594524	1	0
742	237265635	0	0
743	237265686	1	0
744	237876709	0	0
745	237876760	1	0
746	238538475	0	0
747	238538526	1	0
748	239585419	1	1
749	313910856	0	1
750	395970467	0	0
751	760509402	0	1

That also had issues at lines 207 - 208, 310 - 311, 313 - 314, 462 - 463 and 567 - 568. Will try turning off the interrupts listed in the nrf52840.h file one by one to see which has any effect.

Am I right to assume that Ticker is powered by SysTick_IRQn (exception number -1)? If yes, then that suggests that ISRcounter already has higher priority than both UART0 and UART1. If it’s based on anyone of TIMER0 - TIMER4 then shifting the timer position lower might help.

5

On ARM, the priority of interrupts is set in the core registers, it’s not determined by the ordering. But if starting a critical section didn’t fix the issue, I think we might be barking up the wrong tree. Critical sections should prevent ISRs from executing completely.

I wonder if somehow something is causing a stall on the memory bus? Like, we’re running code faster than the MCU flash controller can keep up with?

6

Oh… I see. Didn’t know that could happen, never considered it. Clocked the code at about 38 clock cycles using DWT->CYCCNT. Seems funny though that a memory bus stall would take upwards of 15000 clock counts to clear up. Plus it only happens a few times during each code run (typically only once for the initial code posted earlier). Would have expected a whole lot more stalls. Interestingly, I found one run where there
wasn’t any skipped sensor data (one out of the first five trials).

Does it make sense to slow the code down some by adding pointless code lines like x++; or something of the sort?

7

Correction: 54 clock cycles using variable “buft3” for timing. Still pretty fast, i think, for something that updates every 15000+ clock counts.

8

Tried a multiply statement and a divide statement within the for-loop but those didn’t help. Also tried applying wait_ns at various levels up to 1000ns and tried wait_us at 10 and 50 us. The pattern just got worse as the wait time frames grew.

Swapped out the sensor for another thinking it might be a problem with faulty hardware but the sensor seems okay.

9

is the encoder speed that high? There are controllers with QEI in hardware, e.g. STM32 have some or also LPC1768 (but only one counter).

10

The speed is not so high. It’s an impact event (latched spring being released) on the order of about 1 m/s (about 13 rad/s on my pulley-based setup) at its peak. I originally overestimated the event’s peak speed (rough calculations suggested 2.3m/s) which led to the search for faster read methods.

Don’t have those other boards on hand right now. Just the nano.

By the way, interrupts get me pretty close to where I need to be. Tested two code variants. One of them seems unstable (jitter at the tail end) while the other shows multiple issues like below.

1	0	0	0
2	153033648	0	1
3	154156704	0	0
4	154455874	1	0
5	154747109	1	1
6	154815667	0	1
7	154849864	0	0
8	154886178	1	0
9	154929237	1	1
10	154960438	0	1
11	154992048	0	0
12	155023943	1	0
13	155044097	1	1
14	155064590	0	1
15	155086297	0	0
16	155108562	1	0
17	155130568	1	1
18	155151054	0	1
19	155173593	0	0
20	155196838	1	0
21	155221128	1	1
22	155244315	0	1
23	155269649	0	0
24	155300906	1	0
25	155327661	1	1
26	155356619	0	1
27	155384801	0	0
28	155414571	1	0
29	155440373	1	1
30	155468198	0	1
31	155496020	0	0
32	155525906	1	0
33	155549885	1	1
34	155575830	0	1
35	155601521	0	0
36	155626874	1	0
37	155650580	1	1
38	155673002	0	1
39	155695436	0	0
40	155716922	1	0
41	155738032	1	1
42	155758219	0	1
43	155778441	0	0
44	155801891	1	0
45	155817117	1	1
46	155835266	0	1
47	155853689	0	0
48	155887846	1	0
49	155889021	1	1
50	155905842	0	1
51	155922958	0	0
52	155939814	1	0
53	155957064	1	1
54	155974054	0	1
55	155991877	0	0
56	156009354	1	0
57	156027129	1	1
58	156044554	0	1
59	156063088	0	0
60	156085075	1	0
61	156098964	1	1
62	156116850	0	1
63	156135693	0	0
64	156159750	1	0
65	156173013	1	1
66	156192543	0	1
67	156209833	0	0
68	156227930	1	0
69	156245968	1	1
70	156263603	0	1
71	156281773	0	0
72	156302378	1	0
73	156318336	1	1
74	156336623	0	1
75	156355669	0	0
76	156374346	1	0
77	156393549	1	1
78	156412131	0	1
79	156431353	0	0
80	156449650	1	0
81	156468069	1	1
82	156485562	0	1
83	156503357	0	0
84	156520330	1	0
85	156537380	1	1
86	156553554	0	1
87	156570061	0	0
88	156586102	1	0
89	156602468	1	1
90	156618238	0	1
91	156634761	0	0
92	156650702	1	0
93	156666832	1	1
94	156682558	0	1
95	156698678	0	0
96	156714514	1	0
97	156730712	1	1
98	156745974	0	1
99	156761861	0	0
100	156777158	1	0
101	156792469	1	1
102	156807282	0	1
103	156822593	0	0
104	156837347	1	0
105	156852384	1	1
106	156866563	0	1
107	156881209	0	0
108	156895507	1	0
109	156910081	1	1
110	156924182	0	1
111	156939029	0	0
112	156953514	1	0
113	156968753	1	1
114	156983586	0	1
115	156999129	0	0
116	157015154	1	0
117	157030897	1	1
118	157046503	0	1
119	157063325	0	0
120	157089410	1	0
121	157096909	1	1
122	157113462	0	1
123	157130685	0	0
124	157147774	1	0
125	157165005	1	1
126	157181590	0	1
127	157198925	0	0
128	157215382	1	0
129	157232273	1	1
130	157248482	0	1
131	157265673	0	0
132	157282083	1	0
133	157298665	1	1
134	157314670	0	1
135	157331313	0	0
136	157347466	1	0
137	157364049	1	1
138	157379958	0	1
139	157396585	0	0
140	157412306	1	0
141	157428678	1	1
142	157444566	0	1
143	157460817	0	0
144	157477847	1	0
145	157492428	1	1
146	157507638	0	1
147	157523441	0	0
148	157538462	1	0
149	157553978	1	1
150	157568818	0	1
151	157583981	0	0
152	157598666	1	0
153	157613693	1	1
154	157628218	0	1
155	157643721	0	0
156	157660078	1	0
157	157673837	1	1
158	157688918	0	1
159	157704297	0	0
160	157735510	1	1
161	157735818	1	1
162	157750918	0	1
163	157767185	0	0
164	157782842	1	0
165	157799801	1	1
166	157814966	0	1
167	157831005	0	0
168	157846870	1	0
169	157864581	1	1
170	157878930	0	1
171	157895057	0	0
172	157910890	1	0
173	157929072	1	1
174	157943606	0	1
175	157959858	0	0
176	157976103	1	0
177	157992921	1	1
178	158009023	0	1
179	158025961	0	0
180	158042662	1	0
181	158060058	1	1
182	158076214	0	1
183	158093689	0	0
184	158113550	1	0
185	158128846	1	1
186	158145866	0	1
187	158163645	0	0
188	158181186	1	0
189	158198670	1	1
190	158215710	0	1
191	158233673	0	0
192	158251186	1	0
193	158267772	1	1
194	158284658	0	1
195	158302374	0	0
196	158337246	1	1
197	158337554	1	1
198	158354754	0	1
199	158372609	0	0
200	158409246	1	1
201	158409554	1	1
202	158427371	0	1
203	158446169	0	0
204	158467922	1	0
205	158483668	1	1
206	158502235	0	1
207	158522120	0	0
208	158543774	1	0
209	158560372	1	1
210	158579547	0	1
211	158599357	0	0
212	158618098	1	0
213	158637757	1	1
214	158656470	0	1
215	158675773	0	0
216	158695366	1	0
217	158714817	1	1
218	158733742	0	1
219	158754037	0	0
220	158777826	1	0
221	158794740	1	1
222	158815038	0	1
223	158836508	0	0
224	158859110	1	0
225	158878253	1	1
226	158899707	0	1
227	158921381	0	0
228	158947970	1	0
229	158965645	1	1
230	158987386	0	1
231	159010685	0	0
232	159056510	1	1
233	159056818	1	1
234	159079986	0	1
235	159104204	0	0
236	159128034	1	0
237	159153529	1	1
238	159178742	0	1
239	159205757	0	0
240	159234766	1	0
241	159259860	1	1
242	159287583	0	1
243	159316366	0	0
244	159350966	1	0
245	159375296	1	1
246	159407103	0	1
247	159438613	0	0
248	159472066	1	0
249	159507656	1	1
250	159544695	0	1
251	159585650	0	0
252	159628954	1	0
253	159676105	1	1
254	159726074	0	1
255	159784184	0	0
256	159853738	1	0
257	159955733	1	1
258	160284854	1	0
259	160378811	0	0
260	160451863	0	1
261	160524462	1	1
262	160649102	1	0
263	160673376	1	1
264	160732938	1	0
265	160821685	0	0
266	160871712	0	1
267	161029774	1	1
268	161180450	1	0
269	161270055	0	0
270	161548094	1	0
271	161636670	1	1
272	161683327	0	1
273	161723080	0	0
274	161759426	1	0
275	161796013	1	1
276	161832499	0	1
277	161866220	0	0
278	161912391	1	0
279	161979259	1	1
280	162031978	0	1
281	162091829	0	0
282	162149826	1	0
283	162203353	1	1
284	162289483	0	1
285	162409892	0	0
286	162494430	1	0
287	162576166	1	1
288	162656591	0	1
289	162793608	0	0
290	162905334	1	0
291	163293341	1	1
292	163298468	1	0
293	163307000	1	1
294	163307849	1	0
295	163309640	1	1
296	163314068	1	0
297	163314916	1	1
298	163318304	1	0
299	163320112	1	1
300	163322192	1	0
301	163325228	1	1
302	163326780	1	0
303	163331017	1	0
304	163331457	1	0
305	163333209	1	1
306	163336872	1	0
307	163338040	1	0
308	163338479	1	0
309	163373320	1	1
310	163373759	1	0
311	163374501	1	0
312	163374940	1	0
313	163375685	1	0
314	163376426	1	0
315	163380516	1	0
316	163380955	1	1
317	163487606	0	0
318	163517473	0	0
319	163517913	0	0
320	163519177	0	0
321	163520601	0	0
322	163548320	0	1
323	163566401	0	0
324	163568981	0	1
325	163572837	0	0
326	163606356	0	1
327	163738010	1	1
328	163833458	1	0
329	163914539	0	0
330	164004527	0	1
331	164100430	1	1
332	164184362	1	0
333	164257515	0	0
334	164332719	0	1
335	164411762	1	1
336	164490474	1	0
337	164561231	0	0
338	164628939	0	1
339	164696338	1	1
340	164768154	1	0
341	164841319	0	0
342	164909499	0	1
343	164975786	1	1
344	165041778	1	0
345	165106971	0	0
346	165171035	0	1
347	165231266	1	1
348	165291898	1	0
349	165349707	0	0
350	165410139	0	1
351	165472874	1	1
352	165537894	1	0
353	165568620	1	0
354	165569059	1	0
355	165602339	0	0
356	165635565	0	0
357	165636005	0	0
358	165676007	0	1
359	165756590	1	1
360	165847110	1	0
361	165852332	1	0
362	165852771	1	0
363	165859113	1	0
364	165859552	1	0
365	165861305	1	0
366	165861744	1	0
367	165865668	1	0
368	165866107	1	0
369	165868752	1	1
370	165888648	1	0
371	165908621	1	0
372	165909061	1	1
373	165909501	1	1
374	165910242	1	0
375	165910682	1	0
376	165911422	1	0
377	165912669	1	0
378	165914192	1	0
379	165915945	1	0
380	165916384	1	1
381	165919376	1	0
382	165919815	1	0
383	165920557	1	0
384	165922049	1	0
385	165927320	1	0
386	165927759	1	0
387	165930013	1	0
388	165930452	1	1
389	165930892	1	0
390	165931331	1	1
391	165944578	0	0
392	165992740	0	0
393	165993181	0	0
394	165997425	0	0
395	165997865	0	0
396	166000733	0	1
397	166001517	0	0
398	166143818	1	1
399	166144126	1	1
400	166248490	1	0
401	166394439	0	0
402	166569931	0	1
403	166764382	1	1
404	166873726	1	0
405	166962211	0	0
406	167066311	0	1
407	167162866	1	1
408	167239738	1	0
409	167300063	0	0
410	167369519	0	1
411	167409278	1	1
412	167456598	1	0
413	167496218	0	0
414	167532327	0	1
415	167566362	1	1
416	167599374	1	0
417	167633674	0	0
418	167669719	0	1
419	167705842	1	1
420	167743312	1	0
421	167781232	0	0
422	167820445	0	1
423	167858887	1	1
424	167895286	1	0
425	167928942	0	0
426	167959730	0	1
427	167987629	1	1
428	168036254	1	0
429	168074562	0	0
430	168103035	0	1
431	168194470	1	1
432	168221826	1	0
433	168242062	0	0
434	168273101	0	1
435	168295910	1	1
436	168330792	1	0
437	168367619	0	0
438	168429719	0	1
439	168509914	1	1
440	168559910	1	0
441	168604371	0	0
442	168707539	0	1
443	168718490	1	1
444	168937446	1	0
445	169153613	1	1
446	169294667	0	1
447	169372130	0	0
448	169448246	1	0
449	169524109	1	1
450	169579463	0	1
451	169641324	0	0
452	170031346	1	0
453	170139663	0	0
454	170425299	0	1
455	170508150	1	1
456	170570438	1	0
457	170643803	0	0
458	170735963	0	1
459	170791782	1	1
460	170842392	1	0
461	170896831	0	0
462	170960163	0	1
463	171036223	1	1
464	171121546	1	0
465	171188591	0	0
466	171301434	1	1
467	171301742	1	1
468	171367371	1	0
469	171423146	0	0
470	171461027	0	1
471	171510651	1	1
472	171552792	1	0
473	171595772	0	0
474	171654395	0	1
475	171712442	1	1
476	171769474	1	0
477	171823595	0	0
478	171915706	1	1
479	171916014	1	1
480	171959418	1	0
481	172035619	0	0
482	172102239	0	1
483	172155454	1	1
484	172206766	1	0
485	172279591	0	0
486	172339859	0	1
487	172409042	1	1
488	172490315	1	0
489	172563415	0	0
490	172642567	0	1
491	172742570	1	1
492	172833691	1	0
493	172953539	0	0
494	173099959	0	1
495	173271734	1	1
496	173569938	1	0
497	174416318	1	1
498	174697823	0	1
499	174961884	0	0
500	175243342	1	0
501	175344557	1	1
502	175507319	0	1
503	175651248	0	0
504	175774778	1	0
505	175896741	1	1
506	176002743	0	1
507	176103716	0	0
508	176202394	1	0
509	176293561	1	1
510	176386627	0	1
511	176490652	0	0
512	176595258	1	0
513	176696121	1	1
514	176794851	0	1
515	176897568	0	0
516	176996230	1	0
517	177100557	1	1
518	177195667	0	1
519	177297152	0	0
520	177390526	1	0
521	177478953	1	1
522	177557211	0	1
523	177643972	0	0
524	177738350	1	0
525	177826598	1	1
526	177909007	0	1
527	178004268	0	0
528	178102694	1	0
529	178196497	1	1
530	178287951	0	1
531	178412537	0	0
532	178532654	1	0
533	178645329	1	1
534	178765783	0	1
535	178888956	0	0
536	179023498	1	0
537	179197601	1	1
538	179363263	0	1
539	179562432	0	0
540	179886102	1	0
541	180998395	0	0
542	181638447	0	1
543	181791610	1	1
544	182441571	0	1
545	182648373	0	0
546	182809614	1	0
547	182993029	1	1
548	183157419	0	1
549	183307109	0	0
550	183461018	1	0
551	183596357	1	1
552	183753411	0	1
553	183887320	0	0
554	184037710	1	0
555	184211737	1	1
556	184448407	0	1
557	184789628	0	0
558	185882103	0	1
559	186266246	1	1
560	186630970	1	0
561	186943007	0	0
562	187263691	0	1
563	187585938	1	1
564	187943998	1	0
565	188257619	0	0
566	188710455	0	1
567	188830010	1	1
568	189096954	1	0
569	189379195	0	0
570	189649035	0	1
571	189946226	1	1
572	190274842	1	0
573	190787459	0	0
574	193978470	1	0
575	203372805	1	1

Will run more tests on the first variant to verify code behaviour and post conclusions in a couple days.

11

Went back to the arduino IDE and ditched interrupts having discovered there were quite a bit of clock cycles to play with between sensor reads.
Used the code below and did ten trials.

byte bufpresE[2500];//Set to reflect memory limits
byte bufpresF[2500];//Set to reflect memory limits
unsigned long buft3[2500];//Set to reflect memory limits

int k = 1;
unsigned long n = 0;

void setup() {
  Serial.begin(2000000); // !! 300, 600, 750, 1200, 2400, 4800, 9600, 19200, 31250, 38400, 57600, 74880, 115200, 230400, 250000, 460800, 500000, 921600, 1000000, 2000000
  while (!Serial); //Wait for serial port to connect. Needed for native USB on nano 33 ble sense.

  pinMode(9, INPUT_PULLUP);
  pinMode(10, INPUT_PULLUP);

  bufpresE[0] = digitalRead(9);
  bufpresF[0] = digitalRead(10);
  bufpresE[1] = bufpresE[0];
  bufpresF[1] = bufpresF[0];
  buft3[0] = 0;

  CoreDebug->DEMCR |= 0x01000000; //Enable the use of DWT.
  DWT->CYCCNT = 0; //Reset cycle counter.
  DWT->CTRL |= 0x1; //Enable cycle counter.
}

void loop() {

  for (n = 0; n < 5000000; n++) {
    bufpresE[k] = digitalRead(9);
    bufpresF[k] = digitalRead(10);
    buft3[k] = DWT->CYCCNT;
    if ((bufpresE[k-1] != bufpresE[k]) || (bufpresF[k-1] != bufpresF[k])) {
      k++;
    }
  }
  
  for (n = 0; n < k; n++) {
    Serial.print(buft3[n]);
    Serial.print(",");
    Serial.print(bufpresE[n]);
    Serial.print(",");
    Serial.println(bufpresF[n]);
  }
  Serial.println("end of sensor 3 data");
  
  while(1);
}

Got data like below for each trial.

1	0	0	0
2	260796672	1	0
3	348898378	0	0
4	349367810	1	0
5	349458161	1	1
6	349504838	0	1
7	349556516	0	0
8	349641440	1	0
9	349696688	1	1
10	349753603	0	1
11	349796472	0	0
12	349833511	1	0
13	349867601	1	1
14	349897948	0	1
15	349928693	0	0
16	349962594	1	0
17	349993965	1	1
18	350023066	0	1
19	350050257	0	0
20	350088334	1	0
21	350095646	1	1
22	350115735	0	1
23	350137302	0	0
24	350155904	1	0
25	350174533	1	1
26	350192717	0	1
27	350210519	0	0
28	350227867	1	0
29	350245657	1	1
30	350263005	0	1
31	350280394	0	0
32	350311565	1	0
33	350315533	1	1
34	350333336	0	1
35	350351725	0	0
36	350370007	1	0
37	350388064	1	1
38	350405689	0	1
39	350423316	0	0
40	350440272	1	0
41	350456780	1	1
42	350472503	0	1
43	350488175	0	0
44	350503458	1	0
45	350518712	1	1
46	350533598	0	1
47	350549061	0	0
48	350576472	1	0
49	350580022	1	1
50	350595740	0	1
51	350611830	0	0
52	350628162	1	0
53	350644252	1	1
54	350660394	0	1
55	350676902	0	0
56	350711207	0	1
57	350711417	1	1
58	350728591	0	1
59	350746353	0	0
60	350764352	1	0
61	350782365	1	1
62	350800340	0	1
63	350818741	0	0
64	350843001	1	0
65	350855370	1	1
66	350873554	0	1
67	350891348	0	0
68	350910832	1	0
69	350926922	1	1
70	350944688	0	1
71	350962474	0	0
72	350980493	1	0
73	350999300	1	1
74	351018137	0	1
75	351037571	0	0
76	351056425	1	0
77	351075023	1	1
78	351093439	0	1
79	351112080	0	0
80	351130264	1	0
81	351148050	1	1
82	351165816	0	1
83	351183618	0	0
84	351201175	1	0
85	351218547	1	1
86	351235727	0	1
87	351252862	0	0
88	351287165	1	1
89	351303925	0	1
90	351320851	0	0
91	351337598	1	0
92	351354733	1	1
93	351371495	0	1
94	351388630	0	0
95	351405798	1	0
96	351423142	1	1
97	351440113	0	1
98	351457248	0	0
99	351473995	1	0
100	351491162	1	1
101	351506847	0	1
102	351523355	0	0
103	351539479	1	0
104	351556239	1	1
105	351571288	0	1
106	351587587	0	0
107	351603708	1	0
108	351620049	1	1
109	351636143	0	1
110	351653069	0	0
111	351669815	1	0
112	351686783	1	1
113	351703504	0	1
114	351721488	0	0
115	351737600	1	0
116	351754361	1	1
117	351771291	0	1
118	351788452	0	0
119	351805173	1	0
120	351822347	1	1
121	351839277	0	1
122	351856440	0	0
123	351873161	1	0
124	351889919	1	1
125	351906431	0	1
126	351922968	0	0
127	351939480	1	0
128	351956239	1	1
129	351972542	0	1
130	351988868	0	0
131	352006879	1	0
132	352022138	1	1
133	352039068	0	1
134	352055813	0	0
135	352082820	1	0
136	352089296	1	1
137	352106017	0	1
138	352122761	0	0
139	352155618	0	1
140	352155828	1	1
141	352171500	0	1
142	352187619	0	0
143	352203545	1	0
144	352219217	1	1
145	352234684	0	1
146	352250383	0	0
147	352281356	1	1
148	352296401	0	1
149	352311686	0	0
150	352326944	1	0
151	352341826	1	1
152	352356875	0	1
153	352371734	0	0
154	352386783	1	0
155	352402077	1	1
156	352417126	0	1
157	352432200	0	0
158	352447667	1	0
159	352463169	1	1
160	352478218	0	1
161	352493890	0	0
162	352509590	1	0
163	352525300	1	1
164	352540558	0	1
165	352556021	0	0
166	352571728	1	0
167	352587432	1	1
168	352602493	0	1
169	352618165	0	0
170	352634075	1	0
171	352649956	1	1
172	352665883	0	1
173	352682182	0	0
174	352698722	1	0
175	352715230	1	1
176	352731789	0	1
177	352748924	0	0
178	352766092	1	0
179	352783272	1	1
180	352799993	0	1
181	352818199	0	0
182	352834920	1	0
183	352852092	1	1
184	352869231	0	1
185	352886604	0	0
186	352903743	1	0
187	352920924	1	1
188	352937854	0	1
189	352954809	0	0
190	352971530	1	0
191	352988286	1	1
192	353005007	0	1
193	353021960	0	0
194	353038722	1	0
195	353055857	1	1
196	353072996	0	1
197	353090368	0	0
198	353107759	1	0
199	353125939	1	1
200	353143735	0	1
201	353161915	0	0
202	353179933	1	0
203	353198113	1	1
204	353216113	0	1
205	353234544	0	0
206	353252937	1	0
207	353271354	1	1
208	353289538	0	1
209	353308594	0	0
210	353327196	1	0
211	353345817	1	1
212	353364459	0	1
213	353383684	0	0
214	353402730	1	0
215	353422164	1	1
216	353441436	0	1
217	353461288	0	0
218	353481385	1	0
219	353501907	1	1
220	353521972	0	1
221	353542896	0	0
222	353563838	1	0
223	353584944	1	1
224	353605665	0	1
225	353626811	0	0
226	353647503	1	0
227	353668637	1	1
228	353689580	0	1
229	353711313	0	0
230	353733287	1	0
231	353755271	1	1
232	353777426	0	1
233	353800027	0	0
234	353823060	1	0
235	353847301	1	1
236	353871570	0	1
237	353896857	0	0
238	353945149	1	0
239	353949117	1	1
240	353976497	0	1
241	354006435	0	0
242	354063128	1	0
243	354063334	1	1
244	354093260	0	1
245	354125049	0	0
246	354157486	1	0
247	354191577	1	1
248	354226941	0	1
249	354264635	0	0
250	354304375	1	0
251	354346628	1	1
252	354390340	0	1
253	354437223	0	0
254	354487633	1	0
255	354547264	1	1
256	354626154	0	1
257	354795491	0	0
258	354920436	0	1
259	355023368	1	1
260	355092198	1	0
261	355161232	0	0
262	355363588	0	1
263	355390341	1	1
264	355448090	1	0
265	355525075	0	0
266	355675719	0	1
267	355739537	1	1
268	355791439	1	0
269	355964878	0	0
270	355983295	0	1
271	355983505	0	0
272	355993120	0	1
273	355993957	0	0
274	355995212	1	0
275	356008209	1	1
276	356008419	1	0
277	356015108	1	1
278	356015318	1	0
279	356110300	1	1
280	356161554	0	1
281	356208854	0	0
282	356247335	1	0
283	356280814	1	1
284	356314492	0	1
285	356353823	0	0
286	356415127	1	0
287	356435007	1	1
288	356477687	0	1
289	356529999	0	0
290	356576848	1	0
291	356618271	1	1
292	356669754	0	1
293	356719355	0	0
294	356775601	1	0
295	356860977	1	1
296	356930856	0	1
297	357010573	0	0
298	357162864	1	0
299	357213299	1	1
300	357341140	0	1
301	357427984	0	0
302	357516675	1	0
303	357560007	1	1
304	357560217	1	0
305	357562517	1	1
306	357563145	1	0
307	357633858	1	1
308	357832207	0	1
309	357953358	1	1
310	358263856	1	0
311	358383911	0	0
312	358502242	0	1
313	358605182	1	1
314	358691173	1	0
315	358772335	0	0
316	358864819	0	1
317	358952183	1	1
318	359026651	1	0
319	359095485	0	0
320	359163059	0	1
321	359236320	1	1
322	359311000	1	0
323	359377951	0	0
324	359497634	0	1
325	359497844	1	1
326	359557270	1	0
327	359618163	0	0
328	359678590	0	1
329	359735722	1	1
330	359789290	1	0
331	359840121	0	0
332	359947159	0	1
333	359950295	1	1
334	360009300	1	0
335	360070818	0	0
336	360187952	0	1
337	360188162	1	1
338	360249675	1	0
339	360312440	0	0
340	360372911	0	1
341	360426666	1	1
342	360480856	1	0
343	360536110	0	0
344	360601590	0	1
345	360688843	1	1
346	360794912	1	0
347	360894699	0	0
348	360999939	0	1
349	361093670	1	1
350	361181562	1	0
351	361274033	1	1
352	361274452	1	0
353	361277797	1	1
354	361278007	1	0
355	361282815	1	1
356	361283025	1	0
357	361285952	1	1
358	361286162	1	0
359	361294353	0	0
360	361560280	0	1
361	361676793	1	1
362	361777434	1	0
363	361852981	0	0
364	361950699	0	1
365	362003639	1	1
366	362081036	1	0
367	362161572	0	0
368	362234606	0	1
369	362286275	1	1
370	362331279	1	0
371	362367881	0	0
372	362403448	0	1
373	362438385	1	1
374	362471444	1	0
375	362507212	0	0
376	362544244	0	1
377	362582968	1	1
378	362622077	1	0
379	362660787	0	0
380	362699057	0	1
381	362735679	1	1
382	362772069	1	0
383	362808897	0	0
384	362890089	0	1
385	362890299	1	1
386	362934020	1	0
387	362975474	0	0
388	363015837	0	1
389	363053497	1	1
390	363090722	1	0
391	363129221	0	0
392	363169839	0	1
393	363215222	1	1
394	363273603	1	0
395	363357110	0	0
396	363441606	0	1
397	363528031	1	1
398	363556490	1	0
399	363629709	1	1
400	363649774	0	1
401	363678890	0	0
402	363716322	0	1
403	363729499	1	1
404	363799163	0	1
405	363821354	1	1
406	363861717	1	0
407	363960064	1	1
408	364027851	0	1
409	364119491	0	0
410	364250267	0	1
411	364307395	1	1
412	364396542	0	1
413	364630070	1	1
414	364946220	1	0
415	365037034	0	0
416	365112762	0	1
417	365237468	1	1
418	365297107	1	0
419	365371793	0	0
420	365473258	1	1
421	365532265	1	0
422	365596709	0	0
423	365664908	0	1
424	365725172	1	1
425	365779994	1	0
426	365846738	0	0
427	365956993	0	1
428	365981685	1	1
429	366041112	1	0
430	366082748	0	0
431	366164532	1	1
432	366216646	1	0
433	366255549	0	0
434	366303900	0	1
435	366342817	1	1
436	366382966	1	0
437	366426924	0	0
438	366482557	0	1
439	366540937	1	1
440	366597859	1	0
441	366653947	0	0
442	366720476	0	1
443	366784500	1	1
444	366858354	1	0
445	366931578	0	0
446	367051260	0	1
447	367051470	1	1
448	367148752	1	0
449	367313862	0	0
450	367448262	0	1
451	367607267	1	1
452	367770039	1	0
453	368083995	0	0
454	368316222	0	1
455	368767732	1	1
456	369334432	0	1
457	369526078	0	0
458	369701400	1	0
459	369816066	1	1
460	369926717	0	1
461	370040247	0	0
462	370134208	1	0
463	370249251	1	1
464	370347809	0	1
465	370430669	0	0
466	370563801	1	0
467	370596236	1	1
468	370685576	0	1
469	370773454	0	0
470	370925030	1	0
471	370958072	1	1
472	371033217	0	1
473	371105391	0	0
474	371249321	1	0
475	371252871	1	1
476	371339494	0	1
477	371429265	0	0
478	371531562	1	0
479	371602064	1	1
480	371684730	0	1
481	371756480	0	0
482	371880140	1	0
483	371902918	1	1
484	371988298	0	1
485	372074302	0	0
486	372147109	1	0
487	372227012	1	1
488	372306109	0	1
489	372374521	0	0
490	372468056	1	0
491	372513267	1	1
492	372583981	0	1
493	372663473	0	0
494	372748013	1	0
495	372827083	1	1
496	372911217	0	1
497	372992591	0	0
498	373067716	1	0
499	373158727	1	1
500	373249313	0	1
501	373360848	0	0
502	373484931	1	0
503	373610044	1	1
504	373721750	0	1
505	373869059	0	0
506	374043950	1	0
507	374301091	1	1
508	375310831	1	0
509	375554805	0	0
510	375802119	0	1
511	375959015	1	1
512	376138124	1	0
513	376762943	1	1
514	376926359	0	1
515	377042069	0	0
516	377194425	1	0
517	377283562	1	1
518	377362053	0	1
519	377434154	0	0
520	377575292	0	1
521	377575502	1	1
522	377640359	0	1
523	377705846	0	0
524	377777633	1	0
525	377870954	1	1
526	377973879	0	1
527	378067825	0	0
528	378164906	1	0
529	378295248	1	1
530	378454282	0	1
531	378809748	0	0
532	379221980	0	1
533	379710306	1	1
534	380016595	1	0
535	380341738	0	0
536	380531924	0	1
537	380826821	1	1
538	381143389	1	0
539	381381171	0	0
540	381736051	0	1
541	381917424	1	1
542	382246107	1	0
543	382449923	0	0
544	382646801	0	1
545	382848693	1	1
546	383039509	1	0
547	383186166	0	0
548	383450846	0	1
549	383516755	1	1
550	383689146	1	0
551	383821171	0	0
552	384102172	0	1
553	384157595	1	1
554	384348414	1	0
555	384529834	0	0
556	384809786	0	1
557	385117136	1	1
558	385677996	1	0
559	387317569	1	1
560	388618263	0	1
561	390003345	0	0
562	390830026	1	0
563	391405782	1	1
564	392464727	0	1
565	459042282	0	0
566	581849828	1	0
567	617409534	1	1
568	722595262	0	1

It barely gets the job done but it seems to work. Almost getting skipped events (eg. line 57) but the code and arduino platform manage to survive somehow.

I think I’ll stick with this for the time being . Begs the question, however, why Mbed can’t seem to deliver even though it’s the base OS layer for the nano 33 BLE board.

Edit: Still have skipped events with the code above. See lines 87-88 of the output.

12

Hello,

I am not sure if this is still true, but I can’t imagine you will have better result with Arduino when this board is based on Mbed (under hood) also in Arduino.

BR, Jan

13

You are right. Edited my previous post a bit earlier. Found a few trouble spots in the data on closer inspection. Think I was a bit too eager for positive results.

14

Why you did not try it via interrupts like in this library? - QEI - Cookbook | Mbed

BR, Jan

15

Thanks. I will try that out and report back.

16

it depends also on the quality of the signals, the signals can bounce when it is not a an optical encoder.

17

Finally got round to running an interrupt-based test. Used the code below and ran three trials.

#include "mbed.h"

InterruptIn line9(D9);
InterruptIn line10(D10);

int bufpresE[2];
int bufpresF[2];
volatile unsigned int buft9high[2500];//Set to reflect memory limits
volatile unsigned int buft9low[2500];//Set to reflect memory limits
volatile unsigned int buft10high[2500];//Set to reflect memory limits
volatile unsigned int buft10low[2500];//Set to reflect memory limits

volatile int a = 0;
int b = 0;

void Buf9high() {
  buft9high[a] = DWT->CYCCNT;
  a++;
}

void Buf9low() {
  buft9low[a] = DWT->CYCCNT;
  a++;
}

void Buf10high() {
  buft10high[a] = DWT->CYCCNT;
  a++;
}

void Buf10low() {
  buft10low[a] = DWT->CYCCNT;
  a++;
}

int main()
{
  NRF_P0->PIN_CNF[27] = 0x0C;
  NRF_P1->PIN_CNF[2] = 0x0C;

  bufpresE[0] = ((NRF_P0->IN & 0x08000000) ? 1 : 0) ;
  bufpresF[0] = ((NRF_P1->IN & 0x00000004) ? 1 : 0) ;

  line9.rise(&Buf9high);
  line9.fall(&Buf9low);
  line10.rise(&Buf10high);
  line10.fall(&Buf10low);

  CoreDebug->DEMCR |= 0x01000000; //Enable the use of DWT.
  DWT->CYCCNT = 0; //Reset cycle counter.
  DWT->CTRL |= 0x1; //Enable cycle counter.

	while(true) 
	{
    if (DWT->CYCCNT > 2200000000)
    {
      bufpresE[1] = ((NRF_P0->IN & 0x08000000) ? 1 : 0) ;
      bufpresF[1] = ((NRF_P1->IN & 0x00000004) ? 1 : 0) ;

      printf(" , , , ,%i, %i\n", bufpresE[0], bufpresF[0]);

      for (b = 0; b < a; b++)
      {
        printf("%i, %i, %i, %i\n", buft9high[b], buft9low[b], buft10high[b], buft10low[b]);
      }

      printf(" , , , ,%i, %i\n", bufpresE[1], bufpresF[1]);

      printf("end of sensor data\n");
    }  
	}

	// main() is expected to loop forever.
	// If main() actually returns the processor will halt
	return 0;
}

I modified Aaron Berk’s cookbook code a bit cos I couldn’t get it to compile on Mbed CE. I’m simply using the interrupts to mark event time and I’m decoding everything in post-processing. The only times I read pin states are at the start of measurements and at the end of measurements to do a rough check on what the interrupts have measured.

Turns out, BecK’s code ignores missed events. He also ignores multiple data samples of the same encoder state. Both cases are labelled as “Invalid” in his code. Apparently, it’s standard practice to ignore such conditions as seen in reply #12 here. A valid assumption, seeing that a missed event only introduces an error of 0.22 mm in my case cos I have a pulley in the mix. Other setups will have far less errors when the encoder spindle is used directly. Some folks advocate keeping a record of “invalid” events as seen in reply #17 also here, possibly to check the quality of measurements.

Posted a sample of the results obtained below.

1	 	 	 	 		1	1
2	0	169670985	0	0	169670985	0	1
3	0	0	0	169763471	169763471	0	0
4	169815062	0	0	0	169815062	1	0
5	0	0	169851188	0	169851188	1	1
6	0	169879829	0	0	169879829	0	1
7	0	0	0	169913581	169913581	0	0
8	169950630	0	0	0	169950630	1	0
9	0	0	169990077	0	169990077	1	1
10	0	170025060	0	0	170025060	0	1
11	0	0	0	170059140	170059140	0	0
12	170089934	0	0	0	170089934	1	0
13	0	0	170118081	0	170118081	1	1
14	0	170144392	0	0	170144392	0	1
15	0	0	0	170169973	170169973	0	0
16	170195022	0	0	0	170195022	1	0
17	0	0	170218576	0	170218576	1	1
18	0	170240568	0	0	170240568	0	1
19	0	0	0	170262280	170262280	0	0
20	170283618	0	0	0	170283618	1	0
21	0	0	170308540	0	170308540	1	1
22	0	170335769	0	0	170335769	0	1
23	0	0	0	170362393	170362393	0	0
24	170389446	0	0	0	170389446	1	0
25	0	0	170415784	0	170415784	1	1
26	0	170438617	0	0	170438617	0	1
27	0	0	0	170457421	170457421	0	0
28	170476326	0	0	0	170476326	1	0
29	0	0	170496628	0	170496628	1	1
30	0	170516437	0	0	170516437	0	1
31	0	0	0	170535961	170535961	0	0
32	170554938	0	0	0	170554938	1	0
33	0	0	170575053	0	170575053	1	1
34	0	170597768	0	0	170597768	0	1
35	0	0	0	170624433	170624433	0	0
36	170651838	0	0	0	170651838	1	0
37	0	0	170683572	0	170683572	1	1
38	0	170716897	0	0	170716897	0	1
39	0	0	0	170748889	170748889	0	0
40	170778078	0	0	0	170778078	1	0
41	0	0	170805228	0	170805228	1	1
42	0	170828253	0	0	170828253	0	1
43	0	0	0	170850277	170850277	0	0
44	170870906	0	0	0	170870906	1	0
45	0	0	170893301	0	170893301	1	1
46	0	170914488	0	0	170914488	0	1
47	0	0	0	170937713	170937713	0	0
48	170961322	0	0	0	170961322	1	0
49	0	0	170985096	0	170985096	1	1
50	0	171008816	0	0	171008816	0	1
51	0	0	0	171032964	171032964	0	0
52	171055974	0	0	0	171055974	1	0
53	0	0	171078596	0	171078596	1	1
54	0	171099441	0	0	171099441	0	1
55	0	0	0	171120005	171120005	0	0
56	171139538	0	0	0	171139538	1	0
57	0	0	171158865	0	171158865	1	1
58	0	171177412	0	0	171177412	0	1
59	0	0	0	171196489	171196489	0	0
60	171215074	0	0	0	171215074	1	0
61	0	0	171233944	0	171233944	1	1
62	0	171252028	0	0	171252028	0	1
63	0	0	0	171270453	171270453	0	0
64	171288006	0	0	0	171288006	1	0
65	0	0	171306048	0	171306048	1	1
66	0	171323108	0	0	171323108	0	1
67	0	0	0	171341212	171341212	0	0
68	171358446	0	0	0	171358446	1	0
69	0	0	171375884	0	171375884	1	1
70	0	171392608	0	0	171392608	0	1
71	0	0	0	171409848	171409848	0	0
72	171426238	0	0	0	171426238	1	0
73	0	0	171442312	0	171442312	1	1
74	0	171457520	0	0	171457520	0	1
75	0	0	0	171473224	171473224	0	0
76	171487754	0	0	0	171487754	1	0
77	0	0	171502712	0	171502712	1	1
78	0	171516956	0	0	171516956	0	1
79	0	0	0	171532976	171532976	0	0
80	171545422	0	0	0	171545422	1	0
81	0	0	171559544	0	171559544	1	1
82	0	171573332	0	0	171573332	0	1
83	0	0	0	171588425	171588425	0	0
84	171603294	0	0	0	171603294	1	0
85	0	0	171618440	0	171618440	1	1
86	0	171633624	0	0	171633624	0	1
87	0	0	0	171649617	171649617	0	0
88	171665694	0	0	0	171665694	1	0
89	0	0	171682684	0	171682684	1	1
90	0	171699588	0	0	171699588	0	1
91	0	0	0	171717877	171717877	0	0
92	171735306	0	0	0	171735306	1	0
93	0	0	171753160	0	171753160	1	1
94	0	171770544	0	0	171770544	0	1
95	0	0	0	171790050	171790050	0	0
96	171806257	0	0	0	171806257	1	0
97	0	0	171823844	0	171823844	1	1
98	0	171840884	0	0	171840884	0	1
99	0	0	0	171858340	171858340	0	0
100	171875066	0	0	0	171875066	1	0
101	0	0	171892628	0	171892628	1	1
102	0	171909340	0	0	171909340	0	1
103	0	0	0	171926820	171926820	0	0
104	171943274	0	0	0	171943274	1	0
105	0	0	171960460	0	171960460	1	1
106	0	171977264	0	0	171977264	0	1
107	0	0	0	171994856	171994856	0	0
108	172012422	0	0	0	172012422	1	0
109	0	0	172030376	0	172030376	1	1
110	0	172048157	0	0	172048157	0	1
111	0	0	0	172066589	172066589	0	0
112	172085030	0	0	0	172085030	1	0
113	0	0	172103780	0	172103780	1	1
114	0	172121681	0	0	172121681	0	1
115	0	0	0	172140185	172140185	0	0
116	172157778	0	0	0	172157778	1	0
117	0	0	172177024	0	172177024	1	1
118	0	172192244	0	0	172192244	0	1
119	0	0	0	172209885	172209885	0	0
120	172226310	0	0	0	172226310	1	0
121	0	0	172242797	0	172242797	1	1
122	0	172258940	0	0	172258940	0	1
123	0	0	0	172275509	172275509	0	0
124	172291698	0	0	0	172291698	1	0
125	0	0	172308169	0	172308169	1	1
126	0	172324148	0	0	172324148	0	1
127	0	0	0	172340929	172340929	0	0
128	172356778	0	0	0	172356778	1	0
129	0	0	172373485	0	172373485	1	1
130	0	172389648	0	0	172389648	0	1
131	0	0	0	172406277	172406277	0	0
132	172422310	0	0	0	172422310	1	0
133	0	0	172438693	0	172438693	1	1
134	0	172454624	0	0	172454624	0	1
135	0	0	0	172471149	172471149	0	0
136	172486930	0	0	0	172486930	1	0
137	0	0	172503305	0	172503305	1	1
138	0	172518708	0	0	172518708	0	1
139	0	0	0	172534497	172534497	0	0
140	172549650	0	0	0	172549650	1	0
141	0	0	172565057	0	172565057	1	1
142	0	172579684	0	0	172579684	0	1
143	0	0	0	172594617	172594617	0	0
144	172609030	0	0	0	172609030	1	0
145	0	0	172623968	0	172623968	1	1
146	0	172638401	0	0	172638401	0	1
147	0	0	0	172653253	172653253	0	0
148	172667802	0	0	0	172667802	1	0
149	0	0	172682860	0	172682860	1	1
150	0	172697669	0	0	172697669	0	1
151	0	0	0	172713057	172713057	0	0
152	172728178	0	0	0	172728178	1	0
153	0	0	172744164	0	172744164	1	1
154	0	172759917	0	0	172759917	0	1
155	0	0	0	172776101	172776101	0	0
156	172792158	0	0	0	172792158	1	0
157	0	0	172808804	0	172808804	1	1
158	0	172824989	0	0	172824989	0	1
159	0	0	0	172841745	172841745	0	0
160	172858066	0	0	0	172858066	1	0
161	0	0	172874880	0	172874880	1	1
162	0	172891217	0	0	172891217	0	1
163	0	0	0	172907925	172907925	0	0
164	172924286	0	0	0	172924286	1	0
165	0	0	172941180	0	172941180	1	1
166	0	172957549	0	0	172957549	0	1
167	0	0	0	172974337	172974337	0	0
168	172990774	0	0	0	172990774	1	0
169	0	0	173007800	0	173007800	1	1
170	0	173024225	0	0	173024225	0	1
171	0	0	0	173041185	173041185	0	0
172	173058014	0	0	0	173058014	1	0
173	0	0	173075488	0	173075488	1	1
174	0	173092633	0	0	173092633	0	1
175	0	0	0	173110633	173110633	0	0
176	173128586	0	0	0	173128586	1	0
177	0	0	173147101	0	173147101	1	1
178	0	173165092	0	0	173165092	0	1
179	0	0	0	173184089	173184089	0	0
180	173202358	0	0	0	173202358	1	0
181	0	0	173220773	0	173220773	1	1
182	0	173238288	0	0	173238288	0	1
183	0	0	0	173256433	173256433	0	0
184	173273814	0	0	0	173273814	1	0
185	0	0	173291448	0	173291448	1	1
186	0	173308444	0	0	173308444	0	1
187	0	0	0	173325785	173325785	0	0
188	173342690	0	0	0	173342690	1	0
189	0	0	173359928	0	173359928	1	1
190	0	173376900	0	0	173376900	0	1
191	0	0	0	173394473	173394473	0	0
192	173411894	0	0	0	173411894	1	0
193	0	0	173430044	0	173430044	1	1
194	0	173447836	0	0	173447836	0	1
195	0	0	0	173466600	173466600	0	0
196	173485082	0	0	0	173485082	1	0
197	0	0	173504436	0	173504436	1	1
198	0	173523352	0	0	173523352	0	1
199	0	0	0	173543428	173543428	0	0
200	173562878	0	0	0	173562878	1	0
201	0	0	173582840	0	173582840	1	1
202	0	173602329	0	0	173602329	0	1
203	0	0	0	173622445	173622445	0	0
204	173641694	0	0	0	173641694	1	0
205	0	0	173661457	0	173661457	1	1
206	0	173680692	0	0	173680692	0	1
207	0	0	0	173700525	173700525	0	0
208	173721594	0	0	0	173721594	1	0
209	0	0	173740712	0	173740712	1	1
210	0	173761064	0	0	173761064	0	1
211	0	0	0	173782525	173782525	0	0
212	173804186	0	0	0	173804186	1	0
213	0	0	173826472	0	173826472	1	1
214	0	173848756	0	0	173848756	0	1
215	0	0	0	173871940	173871940	0	0
216	173893938	0	0	0	173893938	1	0
217	0	0	173916397	0	173916397	1	1
218	0	173937900	0	0	173937900	0	1
219	0	0	0	173959797	173959797	0	0
220	173981270	0	0	0	173981270	1	0
221	0	0	174002760	0	174002760	1	1
222	0	174023400	0	0	174023400	0	1
223	0	0	0	174045024	174045024	0	0
224	174066070	0	0	0	174066070	1	0
225	0	0	174087852	0	174087852	1	1
226	0	174109653	0	0	174109653	0	1
227	0	0	0	174132561	174132561	0	0
228	174155898	0	0	0	174155898	1	0
229	0	0	174181025	0	174181025	1	1
230	0	174205848	0	0	174205848	0	1
231	0	0	0	174232293	174232293	0	0
232	174258562	0	0	0	174258562	1	0
233	0	0	174285724	0	174285724	1	1
234	0	174312417	0	0	174312417	0	1
235	0	0	0	174339465	174339465	0	0
236	174366438	0	0	0	174366438	1	0
237	0	0	174394124	0	174394124	1	1
238	0	174421644	0	0	174421644	0	1
239	0	0	0	174450864	174450864	0	0
240	174480982	0	0	0	174480982	1	0
241	0	0	174512845	0	174512845	1	1
242	0	174546208	0	0	174546208	0	1
243	0	0	0	174583160	174583160	0	0
244	174619010	0	0	0	174619010	1	0
245	0	0	174657653	0	174657653	1	1
246	0	174694889	0	0	174694889	0	1
247	0	0	0	174734457	174734457	0	0
248	174774134	0	0	0	174774134	1	0
249	0	0	174817737	0	174817737	1	1
250	0	174865480	0	0	174865480	0	1
251	0	0	0	174924464	174924464	0	0
252	174990834	0	0	0	174990834	1	0
253	0	0	175075377	0	175075377	1	1
254	0	175183397	0	0	175183397	0	1
255	175433243	0	0	0	175433243	1	1
256	0	0	0	175896186	175896186	1	0
257	0	0	175955492	0	175955492	1	1
258	0	0	0	176010867	176010867	1	0
259	0	176122451	0	0	176122451	0	0
260	176380087	0	0	0	176380087	1	0
261	0	0	176509777	0	176509777	1	1
262	0	176569501	0	0	176569501	0	1
263	0	0	0	176615753	176615753	0	0
264	176657994	0	0	0	176657994	1	0
265	0	0	176686493	0	176686493	1	1
266	0	176727760	0	0	176727760	0	1
267	0	0	0	176782488	176782488	0	0
268	176831366	0	0	0	176831366	1	0
269	0	0	176882201	0	176882201	1	1
270	0	176935440	0	0	176935440	0	1
271	0	0	0	176976540	176976540	0	0
272	177012358	0	0	0	177012358	1	0
273	0	0	177057104	0	177057104	1	1
274	0	177097849	0	0	177097849	0	1
275	0	0	0	177149856	177149856	0	0
276	177222282	0	0	0	177222282	1	0
277	0	0	177293433	0	177293433	1	1
278	0	177353729	0	0	177353729	0	1
279	0	0	0	177416504	177416504	0	0
280	177468850	0	0	0	177468850	1	0
281	0	0	177555481	0	177555481	1	1
282	0	177678737	0	0	177678737	0	1
283	0	0	0	177765848	177765848	0	0
284	177841546	0	0	0	177841546	1	0
285	0	0	177841826	0	177841826	1	1
286	0	0	0	177842229	177842229	1	0
287	0	0	177938597	0	177938597	1	1
288	0	178058093	0	0	178058093	0	1
289	0	0	0	178162380	178162380	0	0
290	0	0	178688742	0	178688742	0	1
291	178831300	0	0	0	178831300	1	1
292	0	0	0	178992566	178992566	1	0
293	0	0	179002309	0	179002309	1	1
294	0	0	0	179002711	179002711	1	0
295	0	0	179003117	0	179003117	1	1
296	0	0	0	179003518	179003518	1	0
297	0	0	179004231	0	179004231	1	1
298	0	0	0	179004632	179004632	1	0
299	0	0	179017496	0	179017496	1	1
300	0	0	0	179018201	179018201	1	0
301	0	179024951	0	0	179024951	0	0
302	179025358	0	0	0	179025358	1	0
303	0	0	179026668	0	179026668	1	1
304	0	0	0	179027876	179027876	1	0
305	0	0	179028282	0	179028282	1	1
306	0	0	0	179030368	179030368	1	0
307	0	0	179031083	0	179031083	1	1
308	0	0	0	179038908	179038908	1	0
309	0	0	179046756	0	179046756	1	1
310	0	0	0	179057884	179057884	1	0
311	0	0	179059104	0	179059104	1	1
312	0	0	0	179059809	179059809	1	0
313	0	0	179061396	0	179061396	1	1
314	0	0	0	179067622	179067622	1	0
315	0	0	179071660	0	179071660	1	1
316	0	0	0	179074668	179074668	1	0
317	0	0	179077984	0	179077984	1	1
318	0	0	0	179078385	179078385	1	0
319	0	0	179079099	0	179079099	1	1
320	0	0	0	179084769	179084769	1	0
321	0	0	179088188	0	179088188	1	1
322	0	0	0	179089677	179089677	1	0
323	0	179091258	0	0	179091258	0	0
324	0	0	179186147	0	179186147	0	1
325	179303760	0	0	0	179303760	1	1
326	0	0	0	179397138	179397138	1	0
327	0	179472279	0	0	179472279	0	0
328	0	0	179552871	0	179552871	0	1
329	179639048	0	0	0	179639048	1	1
330	0	0	0	179718878	179718878	1	0
331	0	0	179736060	0	179736060	1	1
332	0	0	0	179737597	179737597	1	0
333	0	0	179740948	0	179740948	1	1
334	0	0	0	179741349	179741349	1	0
335	0	0	179742063	0	179742063	1	1
336	0	0	0	179743480	179743480	1	0
337	0	0	179749196	0	179749196	1	1
338	0	0	0	179750501	179750501	1	0
339	0	179783325	0	0	179783325	0	0
340	0	0	179843675	0	179843675	0	1
341	179903680	0	0	0	179903680	1	1
342	0	0	0	179968786	179968786	1	0
343	0	180034067	0	0	180034067	0	0
344	0	0	180094479	0	180094479	0	1
345	180148664	0	0	0	180148664	1	1
346	0	0	0	180199286	180199286	1	0
347	0	180248147	0	0	180248147	0	0
348	0	0	180299775	0	180299775	0	1
349	180352856	0	0	0	180352856	1	1
350	0	0	0	180406352	180406352	1	0
351	0	180457107	0	0	180457107	0	0
352	0	0	180504935	0	180504935	0	1
353	180549328	0	0	0	180549328	1	1
354	0	0	0	180593620	180593620	1	0
355	0	180637461	0	0	180637461	0	0
356	0	0	180683907	0	180683907	0	1
357	180730560	0	0	0	180730560	1	1
358	0	0	0	180779122	180779122	1	0
359	0	180825291	0	0	180825291	0	0
360	0	0	180870983	0	180870983	0	1
361	180914012	0	0	0	180914012	1	1
362	0	0	0	180958462	180958462	1	0
363	0	181002000	0	0	181002000	0	0
364	0	0	181048481	0	181048481	0	1
365	181096956	0	0	0	181096956	1	1
366	0	0	0	181147822	181147822	1	0
367	0	181196237	0	0	181196237	0	0
368	0	0	181244341	0	181244341	0	1
369	181289796	0	0	0	181289796	1	1
370	0	0	0	181336446	181336446	1	0
371	0	181385871	0	0	181385871	0	0
372	0	0	181440925	0	181440925	0	1
373	181503296	0	0	0	181503296	1	1
374	0	0	0	181578278	181578278	1	0
375	0	0	181578686	0	181578686	1	1
376	0	0	0	181580504	181580504	1	0
377	0	0	181580910	0	181580910	1	1
378	0	0	0	181581311	181581311	1	0
379	0	0	181585992	0	181585992	1	1
380	0	0	0	181586393	181586393	1	0
381	0	0	181587107	0	181587107	1	1
382	0	0	0	181590588	181590588	1	0
383	0	0	181590994	0	181590994	1	1
384	0	0	0	181591395	181591395	1	0
385	0	0	181595000	0	181595000	1	1
386	0	0	0	181595401	181595401	1	0
387	0	0	181600776	0	181600776	1	1
388	0	0	0	181601984	181601984	1	0
389	0	0	181602390	0	181602390	1	1
390	0	0	0	181602791	181602791	1	0
391	0	181642584	0	0	181642584	0	0
392	0	0	181703539	0	181703539	0	1
393	181761060	0	0	0	181761060	1	1
394	0	0	0	181830630	181830630	1	0
395	0	181902419	0	0	181902419	0	0
396	0	0	181979759	0	181979759	0	1
397	182053380	0	0	0	182053380	1	1
398	0	0	0	182130466	182130466	1	0
399	0	182285103	0	0	182285103	0	0
400	0	0	182402979	0	182402979	0	1
401	182477088	0	0	0	182477088	1	1
402	0	0	0	182548170	182548170	1	0
403	0	182616951	0	0	182616951	0	0
404	0	0	182687079	0	182687079	0	1
405	182753000	0	0	0	182753000	1	1
406	0	0	0	182813886	182813886	1	0
407	0	182890135	0	0	182890135	0	0
408	0	0	182982611	0	182982611	0	1
409	183045964	0	0	0	183045964	1	1
410	0	0	0	183090034	183090034	1	0
411	0	183129539	0	0	183129539	0	0
412	0	0	183169101	0	183169101	0	1
413	183205156	0	0	0	183205156	1	1
414	0	0	0	183240188	183240188	1	0
415	0	183279655	0	0	183279655	0	0
416	0	0	183319307	0	183319307	0	1
417	183359844	0	0	0	183359844	1	1
418	0	0	0	183398126	183398126	1	0
419	0	183433606	0	0	183433606	0	0
420	0	0	183470715	0	183470715	0	1
421	183505340	0	0	0	183505340	1	1
422	0	0	0	183544424	183544424	1	0
423	0	183586411	0	0	183586411	0	0
424	0	0	183692687	0	183692687	0	1
425	183713280	0	0	0	183713280	1	1
426	0	0	0	183742984	183742984	1	0
427	0	183769911	0	0	183769911	0	0
428	0	0	183797453	0	183797453	0	1
429	183822004	0	0	0	183822004	1	1
430	0	0	0	183846178	183846178	1	0
431	0	183878954	0	0	183878954	0	0
432	0	0	183928359	0	183928359	0	1
433	183990936	0	0	0	183990936	1	1
434	0	0	0	184045282	184045282	1	0
435	0	184106727	0	0	184106727	0	0
436	0	0	184125961	0	184125961	0	1
437	184149160	0	0	0	184149160	1	1
438	0	0	0	184286502	184286502	1	0
439	0	0	184376408	0	184376408	1	1
440	0	184684273	0	0	184684273	0	1
441	0	0	0	184791536	184791536	0	0
442	0	0	184917758	0	184917758	0	1
443	0	0	0	185095625	185095625	0	0
444	185195170	0	0	0	185195170	1	0
445	0	185308188	0	0	185308188	0	0
446	185487171	0	0	0	185487171	1	0
447	0	185531012	0	0	185531012	0	0
448	0	0	185636959	0	185636959	0	1
449	185682736	0	0	0	185682736	1	1
450	0	0	0	185740990	185740990	1	0
451	0	185800711	0	0	185800711	0	0
452	0	0	185849155	0	185849155	0	1
453	185916828	0	0	0	185916828	1	1
454	0	0	0	185969866	185969866	1	0
455	0	186013130	0	0	186013130	0	0
456	0	0	186049435	0	186049435	0	1
457	186094932	0	0	0	186094932	1	1
458	0	0	0	186174106	186174106	1	0
459	0	186226887	0	0	186226887	0	0
460	0	0	186276731	0	186276731	0	1
461	186322272	0	0	0	186322272	1	1
462	0	0	0	186363122	186363122	1	0
463	0	186394698	0	0	186394698	0	0
464	0	0	186426407	0	186426407	0	1
465	186457948	0	0	0	186457948	1	1
466	0	0	0	186495254	186495254	1	0
467	0	186534023	0	0	186534023	0	0
468	0	0	186591817	0	186591817	0	1
469	186634912	0	0	0	186634912	1	1
470	0	0	0	186677490	186677490	1	0
471	0	186712270	0	0	186712270	0	0
472	0	0	186749975	0	186749975	0	1
473	186794700	0	0	0	186794700	1	1
474	0	0	0	186841692	186841692	1	0
475	0	186894101	0	0	186894101	0	0
476	0	0	186958367	0	186958367	0	1
477	187019256	0	0	0	187019256	1	1
478	0	0	0	187066358	187066358	1	0
479	0	187110351	0	0	187110351	0	0
480	0	0	187155689	0	187155689	0	1
481	187212424	0	0	0	187212424	1	1
482	0	0	0	187310826	187310826	1	0
483	0	187374635	0	0	187374635	0	0
484	0	0	187437411	0	187437411	0	1
485	187501808	0	0	0	187501808	1	1
486	0	0	0	187618866	187618866	1	0
487	0	187727987	0	0	187727987	0	0
488	0	0	187784091	0	187784091	0	1
489	187974204	0	0	0	187974204	1	1
490	0	0	0	188152694	188152694	1	0
491	0	188384335	0	0	188384335	0	0
492	0	0	188598587	0	188598587	0	1
493	0	0	0	189573425	189573425	0	0
494	189855286	0	0	0	189855286	1	0
495	0	0	190012501	0	190012501	1	1
496	0	190128121	0	0	190128121	0	1
497	0	0	0	190250108	190250108	0	0
498	190375166	0	0	0	190375166	1	0
499	0	0	190464169	0	190464169	1	1
500	0	190536425	0	0	190536425	0	1
501	0	0	0	190618048	190618048	0	0
502	190700698	0	0	0	190700698	1	0
503	0	0	190779932	0	190779932	1	1
504	0	190855653	0	0	190855653	0	1
505	0	0	0	190944756	190944756	0	0
506	191042666	0	0	0	191042666	1	0
507	0	0	191123821	0	191123821	1	1
508	0	191193801	0	0	191193801	0	1
509	0	0	0	191269680	191269680	0	0
510	191350606	0	0	0	191350606	1	0
511	0	0	191432261	0	191432261	1	1
512	0	191507165	0	0	191507165	0	1
513	0	0	0	191583492	191583492	0	0
514	191658702	0	0	0	191658702	1	0
515	0	0	191734301	0	191734301	1	1
516	0	191799033	0	0	191799033	0	1
517	0	0	0	191863752	191863752	0	0
518	191924974	0	0	0	191924974	1	0
519	0	0	191997149	0	191997149	1	1
520	0	192075529	0	0	192075529	0	1
521	0	0	0	192157688	192157688	0	0
522	192236630	0	0	0	192236630	1	0
523	0	0	192316145	0	192316145	1	1
524	0	192392969	0	0	192392969	0	1
525	0	0	0	192468168	192468168	0	0
526	192540010	0	0	0	192540010	1	0
527	0	0	192613113	0	192613113	1	1
528	0	192689265	0	0	192689265	0	1
529	0	0	0	192771832	192771832	0	0
530	192850694	0	0	0	192850694	1	0
531	0	0	192927389	0	192927389	1	1
532	0	192999221	0	0	192999221	0	1
533	0	0	0	193071448	193071448	0	0
534	193141710	0	0	0	193141710	1	0
535	0	0	193214097	0	193214097	1	1
536	0	193285605	0	0	193285605	0	1
537	0	0	0	193368392	193368392	0	0
538	193453470	0	0	0	193453470	1	0
539	0	0	193548275	0	193548275	1	1
540	0	193640397	0	0	193640397	0	1
541	0	0	0	193733464	193733464	0	0
542	193826202	0	0	0	193826202	1	0
543	0	0	193935633	0	193935633	1	1
544	0	194054837	0	0	194054837	0	1
545	0	0	0	194183300	194183300	0	0
546	194327798	0	0	0	194327798	1	0
547	0	0	194463757	0	194463757	1	1
548	0	194656481	0	0	194656481	0	1
549	195570991	0	0	0	195570991	1	1
550	0	0	0	195829162	195829162	1	0
551	0	196007631	0	0	196007631	0	0
552	0	0	196158887	0	196158887	0	1
553	196348588	0	0	0	196348588	1	1
554	0	197045364	0	0	197045364	0	1
555	0	0	0	197185104	197185104	0	0
556	197317218	0	0	0	197317218	1	0
557	0	0	197407065	0	197407065	1	1
558	0	197485329	0	0	197485329	0	1
559	0	0	0	197561684	197561684	0	0
560	197631294	0	0	0	197631294	1	0
561	0	0	197696393	0	197696393	1	1
562	0	197759325	0	0	197759325	0	1
563	0	0	0	197827236	197827236	0	0
564	197905058	0	0	0	197905058	1	0
565	0	0	197995197	0	197995197	1	1
566	0	198076789	0	0	198076789	0	1
567	0	0	0	198156132	198156132	0	0
568	198235742	0	0	0	198235742	1	0
569	0	0	198323693	0	198323693	1	1
570	0	198422053	0	0	198422053	0	1
571	0	0	0	198548532	198548532	0	0
572	198723046	0	0	0	198723046	1	0
573	0	0	198909677	0	198909677	1	1
574	0	0	0	199762667	199762667	1	0
575	0	199983455	0	0	199983455	0	0
576	0	0	200183799	0	200183799	0	1
577	200382096	0	0	0	200382096	1	1
578	0	0	0	200543046	200543046	1	0
579	0	200712239	0	0	200712239	0	0
580	0	0	200891295	0	200891295	0	1
581	201093412	0	0	0	201093412	1	1
582	0	0	0	201264330	201264330	1	0
583	0	201545391	0	0	201545391	0	0
584	0	0	201881135	0	201881135	0	1
585	202303645	0	0	0	202303645	1	1
586	0	0	0	202582814	202582814	1	0
587	0	202866215	0	0	202866215	0	0
588	0	0	203068723	0	203068723	0	1
589	203228996	0	0	0	203228996	1	1
590	0	0	0	203386234	203386234	1	0
591	0	203538195	0	0	203538195	0	0
592	0	0	203686647	0	203686647	0	1
593	203820000	0	0	0	203820000	1	1
594	0	0	0	203968398	203968398	1	0
595	0	204137735	0	0	204137735	0	0
596	0	0	204321179	0	204321179	0	1
597	204501040	0	0	0	204501040	1	1
598	0	0	0	204798122	204798122	1	0
599	0	205111015	0	0	205111015	0	0
600	0	0	205503347	0	205503347	0	1
601	205835524	0	0	0	205835524	1	1
602	0	0	0	206403702	206403702	1	0
603	0	0	207426192	0	207426192	1	1
604	0	208308273	0	0	208308273	0	1
605	0	0	0	211578952	211578952	0	0
606	212129998	0	0	0	212129998	1	0
607	0	0	212638973	0	212638973	1	1
608	0	213684281	0	0	213684281	0	1
609	0	0	0	263647020	263647020	0	0
610	0	0	272197462	0	272197462	0	1
611	0	0	0	281109733	281109733	0	0
612	360075098	0	0	0	360075098	1	0
	 	 	 	 		1	0

I added the results of post-processing in the last three columns. The results follow correctly from the first interrupt to the last read event. No missed events and no multiple sampling of the same state occurred in all three trials. Seems bunching timing operations and pin state reads into each iteration of the for-loop in the first code I posted did a number on the processor (possibly what Jamie suggested). The present form of interrupt code eases the processor enough for it to catch every pin state change (and then some…). Thanks, JojoS and Jan for pointing me in the interrupt direction. Will run more tests to verify code stability.

All the trials had this problem(?) [eg. lines 291 - 322, 329 - 336, 375 - 388, etc] that looks like interrupt-storms which seem to happen at turning points or inflection points. Nowhere near the fastest parts of the measurement event. Appears related to JojoS’ last reply except I’m using an optical encoder. It says again here though (reply #6) that that’s possible and I do have a couple other vibration hotspots in my rig.

Would appreciate it if anyone can give some clarity on the “problem” ( probably isn’t a problem anyways) and the best course of action on it (ignore or include in measurememt data?).

18

Update: did seven more trials to make a total of ten runs of the last measurement technique. I’m ten-for-ten as per no recorded “invalid” counts so it’s probably safe to assume it’s stable. Of course, it’s only good for acquiring data and not for real time control (at least not in its present form).

Suits my purposes so I’m golden. Thanks everybody for helping figure this out.