Compile issue: 'Unknown action post-build'

Mbed OS Bugs
22 
#include "mbed.h"

//Interface with the PC with UART
Serial pc(USBTX, USBRX); // tx, rx

//Valve control
DigitalOut ThValve1(p15); //Port 15
DigitalOut ThValve2(p16); // Port 16
DigitalOut AbdValve1(p17); // Port 17
DigitalOut VacDivValve1(p18); // Port 18
DigitalOut VacDivValve2(p19); // Port 19
DigitalOut VentValve1(p20); // Port 20

AnalogOut speed(p21); //Port 21

DigitalOut Th1_Led(LED1);
DigitalOut Th2_Led(LED2);
DigitalOut Abd_Led(LED3);
DigitalOut VD1_Led(LED4);

char c[20];
char temp;
bool start =0;
bool dataReady =0;
int digitCounter;
int receivedNumber;

int main() {
    
    //set the baudrate 
    pc.baud(9600);
    
    // initit
    Th1_Led = 0;
    Th2_Led = 0;
    Abd_Led = 0;
    VD1_Led = 0;
    
    ThValve1 = 0;
    ThValve2 = 0;
    AbdValve1 = 0;
    VacDivValve1 = 0;
    VacDivValve2 = 0;
    VentValve1 = 0;
    
    Th1_Led = 1;
    wait(1);
    Th1_Led = 0;
    
    while(1) {
        
        // This checks if PC sent any data to uC. This is a flag that indicates data were received
       if(pc.readable()) {
    
            //  This reads the data that was sent 
           temp = pc.getc();
           
            // Control ThValve1
            if (temp =='A') { ThValve1 = 1; Th1_Led=1;}
            if (temp =='B') { ThValve1 = 0; Th1_Led=0;}
            
            // Control ThValve2
            if (temp =='C') { ThValve2 = 1; Th2_Led=1;}
            if (temp =='D') { ThValve2 = 0; Th2_Led=0;}
            
            // Control AbdValve1
            if (temp =='E') { AbdValve1 = 1; Abd_Led=1;}
            if (temp =='F') { AbdValve1 = 0; Abd_Led=0;}
            
            // Control VacDivValve1
            if (temp =='G') { VacDivValve1 = 1; VD1_Led=1;}
            if (temp =='H') { VacDivValve1 = 0; VD1_Led=0;}
            
            // Control VacDivValve2
            if (temp =='I') { VacDivValve2 = 1;}
            if (temp =='J') { VacDivValve2 = 0;}
            
            // Control VentValve1
            if (temp =='K') { VentValve1 = 1;}
            if (temp =='L') { VentValve1 = 0;}
            
            
//-------------SPEED CONTROL--------------------------------------------------
//----------------------------------------------------------------------------

            
            if (start) {
                if (temp =='S') {
                    start= 0;

                    // This changes the c array into a number - +=m indicates an increment
                    for (int j=0; j<10; j++) {
                        //receivedNumber +=(c[j]-48)* pow(10.0,(digitCounter -(j+1)));
                        receivedNumber +=(c[j]-48)* pow(10.0,digitCounter -(j+1));
                        }
                    speed = (receivedNumber+4)/100.0;
                    pc.printf(" %f", (receivedNumber+4)/100.0);
                    

// Two digits received indicate a command has been sent
                    //if (digitCounter > 0) {

// This is for data greater than 2 digits (3 digits) and indicates speed
                        //speed =receivedNumber/600.0;
                        //pc.printf(" speed %.2f",receivedNumber/600.0);
                        //pc.printf(" speed %d",receivedNumber);
                    //}


// Not A and not B indicates data to build a number, by inputting numbers into c array with indexes 1-3
                } 
                
                else {
                    c[digitCounter]=temp;
                    digitCounter++;
                }
            }
            
            
            if (temp =='T') {
                dataReady = 0;
                start = 1;
                receivedNumber = 0;
                digitCounter=0;
                for (int j=1; j< 20; j++)
                    c[j] = 0;
            }
           
//----------------------------------------------------------------------------
//----------------------------------------------------------------------------
           
        }
    }
}
23

To get proper formatting could you please add a line with three backtick characters (like these ```) at the begin and end of your program (edit your post above)? That will make a copy&paste to my online compiler easier.

25

Done.

This code was working before then I got the warning and the code is not working when I upload it on the LPC1768.

26

There is no AnalogOut available on LPC1768 at pin p21. Try pin p18 instead:

//AnalogOut speed(p21); //Port 21
AnalogOut speed(p18);   //Port 18

But as I see, pin p18 is already used as DigitalOut. So you have to select a different pin for the VacDivValve1.

However, PwmOut is available at pin p21. Maybe you worked recently with Arduino where PWM output is called “Analog” (analogWrite()) and you used that in Mbed by mistake. In this case try:

//AnalogOut speed(p21); //Port 21
PwmOut speed(p21); //Port 21
27

Hi,

it works! Thank you very much for your help!

28

thank you for sharing this information with us this is really helpful for me..