8 years, 1 month ago.

Any fix for silly lockup due to HardFault in KL25Z?

Hi all,

I have found that silly variation of "Blinky LED Hello World" hits a HardFault. I am sure it is a HardFault because I have added a handler and it constantly resets the micro, without it the micro stops execution.

I suspect an unaligned address problem, is there any way to change compiler options to fix that?.

#include "mbed.h"


#define LIGHT 0
#define DARK 1

DigitalOut myled(LED_RED);
DigitalOut myled_green(LED_GREEN);
DigitalOut myled_blue(LED_BLUE);


// RESET ON HardFault (invalid address-bad pointer, bus error: access register before clock available, unaligned address)
//  default is lockup (stop execution).
// Replace default infinite loop by a reseting handler, this strong symbols replaces the weak one in startup
// see: https://developer.mbed.org/questions/6974/How-to-write-a-Hard-Fault-Handler/
// This DOES WORK in KL25Z.
extern "C" void HardFault_Handler() {
    NVIC_SystemReset();
}

int main() {
    myled = DARK;
    myled_green = DARK;
    myled_blue = DARK;    //that lockup micro

    while(1) {
        myled = DARK;
        wait(0.2);
        myled = LIGHT;
        wait(0.2);
    }
}