Commit 6e552e15 authored by Damien George's avatar Damien George
Browse files

stmhal: Add debug capability to print out info about a hard fault.

Capability is #if'd off by default.

Thanks to Dave Hylands for the patch.
parent 08517516
......@@ -85,6 +85,40 @@ extern PCD_HandleTypeDef pcd_handle;
/* Cortex-M4 Processor Exceptions Handlers */
/******************************************************************************/
// Set the following to 1 to get some more information on the Hard Fault
// More information about decoding the fault registers can be found here:
// http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0646a/Cihdjcfc.html
#define REPORT_HARD_FAULT_REGS 0
#if REPORT_HARD_FAULT_REGS
#include "mphal.h"
char *fmt_hex(uint32_t val, char *buf) {
const char *hexDig = "0123456789abcdef";
buf[0] = hexDig[(val >> 28) & 0x0f];
buf[1] = hexDig[(val >> 24) & 0x0f];
buf[2] = hexDig[(val >> 20) & 0x0f];
buf[3] = hexDig[(val >> 16) & 0x0f];
buf[4] = hexDig[(val >> 12) & 0x0f];
buf[5] = hexDig[(val >> 8) & 0x0f];
buf[6] = hexDig[(val >> 4) & 0x0f];
buf[7] = hexDig[(val >> 0) & 0x0f];
buf[8] = '\0';
return buf;
}
void print_reg(const char *label, uint32_t val) {
char hexStr[9];
mp_hal_stdout_tx_str(label);
mp_hal_stdout_tx_str(fmt_hex(val, hexStr));
mp_hal_stdout_tx_str("\r\n");
}
#endif // REPORT_HARD_FAULT_REGS
/**
* @brief This function handles NMI exception.
* @param None
......@@ -99,6 +133,19 @@ void NMI_Handler(void) {
* @retval None
*/
void HardFault_Handler(void) {
#if REPORT_HARD_FAULT_REGS
uint32_t cfsr = SCB->CFSR;
print_reg("HFSR ", SCB->HFSR);
print_reg("CFSR ", cfsr);
if (cfsr & 0x80) {
print_reg("MMFAR ", SCB->MMFAR);
}
if (cfsr & 0x8000) {
print_reg("BFAR ", SCB->BFAR);
}
#endif // REPORT_HARD_FAULT_REGS
/* Go to infinite loop when Hard Fault exception occurs */
while (1) {
__fatal_error("HardFault");
......
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