Posted on November 06, 2013 at 12:47Here is a good article that helped me:
http://www.freertos.org/Debugging-Hard-Faults-On-Cortex-M-Microcontrollers.html Slightly modified code:
/**
* @brief C part of hard fault handler
* @brief
http://www.freertos.org/Debugging-Hard-Faults-On-Cortex-M-Microcontrollers.html * @param pointer to stack frame
* @retval none
* @date 2013-10-07
*/
void irqGetStackFrame(uint32_t *stackframe)
{
StackR0 = stackframe[0];
StackR1 = stackframe[1];
StackR2 = stackframe[2];
StackR3 = stackframe[3];
StackR12 = stackframe[4];
StackLR = stackframe[5];
StackPC = stackframe[6];
StackPSR = stackframe[7];
for(;;) {
}
} /* irqGetStackFrame */
/**
* @brief assembler part of hard fault handler
* @brief
http://www.freertos.org/Debugging-Hard-Faults-On-Cortex-M-Microcontrollers.html * @param none
* @retval none
* @date 2013-10-07
*/
void HardFault_Handler(void)
{
__asm volatile
(
'' tst lr, #4 \n''
'' ite eq \n''
'' mrseq r0, msp \n''
'' mrsne r0, psp \n''
'' ldr r1, [r0, #24] \n''
'' ldr r2, handler2_address_const \n''
'' bx r2 \n''
'' handler2_address_const: .word irqGetStackFrame \n''
);
} /* HardFault_Handler */
Here is what I do with undefined interrupt handlers, the number passed to the default hanler helps to find the problem:
/**
* @brief default IRQ handler called by spurious interrupts
* @param irq: interrupt number
* @retval none
* @date 2013-10-04
*/
static void defaultIrqHandler(int irq)
{
for (;;) {
}
} /* defaultIrqHandler */
void NMI_Handler(void)
{
defaultIrqHandler(-9);
}
void MemManage_Handler(void)
{
defaultIrqHandler(-7);
}
void BusFault_Handler(void)
{
defaultIrqHandler(-6);
}
void UsageFault_Handler(void)
{
defaultIrqHandler(-5);
}
void SVC_Handler(void)
{
defaultIrqHandler(-4);
}
void DebugMon_Handler(void)
{
defaultIrqHandler(-3);
}
void PendSV_Handler(void)
{
defaultIrqHandler(-2);
}
#if 0 //defined somewhere else
void SysTick_Handler(void)
{
defaultIrqHandler(-1);
}
#endif
void WWDG_IRQHandler(void)
{
defaultIrqHandler(0);
}
void PVD_IRQHandler(void)
{
defaultIrqHandler(1);
}
void TAMP_STAMP_IRQHandler(void)
{
defaultIrqHandler(2);
}
void RTC_WKUP_IRQHandler(void)
{
defaultIrqHandler(3);
}
void FLASH_IRQHandler(void)
{
defaultIrqHandler(4);
}
void RCC_IRQHandler(void)
{
defaultIrqHandler(5);
}
etc...
