9 years, 11 months ago.

Determining when my program has crashed?

I've got a program on my FRDM-K64F that seems to have died. It runs for a bit and it responds to ping, then eventually stops responding to ping.

Unfortunately, I don't have any I/O available other than the onboard RGB LED, which will make debugging fun. I'll have to use the three colors, along with maybe a few brightness values to give myself a handful of states to home in on where execution has stopped.

I read up on fault handlers, and I added the following functions, though I do not know if they really do anything...

DigitalOut GreenLed(LED_GREEN);
DigitalOut RedLed(LED_RED);

void BlinkErrorCode( int blinks)
{
    for( int i=0; i<blinks; i++) {
        RedLed = 0;
        wait( 0.1);
        RedLed = 1;
        wait( 0.1);
    }
    wait(0.5);
}

extern "C" void HardFault_Handler()
{
    GreenLed = 1;
    BlinkErrorCode(1);
}

extern "C" void UsageFault_Handler()
{
    GreenLed = 1;
    BlinkErrorCode( 2);
}

extern "C" void  BusFault_Handler()
{
    GreenLed = 1;
    BlinkErrorCode( 3);
}

extern "C" void MemMang_Handler()
{
    GreenLed = 1;
    BlinkErrorCode( 4);
}

Are there any other special functions I can implement to determine where my code fails? Ideally, I would like a handler that is called every time the program crashes, and I could then look at the value of a state variable to find the source.