InterruptIn Stuck

Mbed OS
1

Hello,

I have problem with interrupt, I am using mbed API with simplest example but once the interrupt should be triggered it hangs MCU, couldn’t find the problm. same happens when I use HAL Gpio interrupt,

here is the code

/* mbed Microcontroller Library
 * Copyright (c) 2023 ARM Limited
 * SPDX-License-Identifier: Apache-2.0
 */

#include "mbed.h"
#include "TraceVSPI.h"
#include "RelayAPI.h"
#include "ADCDirectAPI.h"
//#include "ADCAlternatingAPI.h"

DigitalOut led(G_LED, 1);
Relay rel1(Relay1), rel2(Relay2);
InterruptIn button(PE_10);



//DirectADC adc1(DC_ADC1, 4);
//DirectADC adc2(DC_ADC2, 4);

uint32_t buffer[100];
//AnalogIn adc1(DC_ADC1);
//DigitalOut adc_en(PA_6);

#define debug_printf     TraceVSPI::printf



void flip()
{
    debug_printf("!");
}

int main()
{


    ThisThread::sleep_for(100ms);
    TraceVSPI::init();
    debug_printf("Trace Init Done -- \r\n");
    ThisThread::sleep_for(500ms);

    button.mode(PullUp);
    button.rise(&flip);

    while (1){
        debug_printf("time pass -- \r\n");
        ThisThread::sleep_for(500ms);

    }

}
2

Hello,

what exactly is this?

I am asking because all methods like - printf, getc/s, putc/s, wrire, read and so on are covered by Mutex in whole MbedOS and Mutex can not be called in ISR. You need to set a bool flag and proces it in main loop or take the code out from ISR context via EventQueue

Also some info about your target will be handy.

BR, Jan

1 Like
3

Please try to use mbed_error_printf(…) instead of printf(…) in interrupt context.

Such like as:

void flip()
{
/* Call mbed_error_printf(…) instead of printf(…) in interrupt context */
mbed_error_printf(“Called in ISR\r\n”);
}

void main()
{
button.rise(&flip);

/* Call printf(...) or mbed_error_printf(...) in thread context at least once before the mbed_error_printf(...) call in interrupt context */
mbed_error_printf("Called in main\r\n");

while (true);

}

4

That’s my class for printf and other stuff, turns out that was problem, I removed that function from interrupt callback and everything works just fine. maybe it was taking some time there and had trouble with interrupt handler.

5

Definitely the printf is function that take a lot, but in Mbed also trigger Mbed OS crash when is called from ISR because of Mutex.

BR, Jan

1 Like