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stm32-f4discovery-cc256x: add disabled hard fault analysis helper code

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This commit is contained in:
Matthias Ringwald 2019-03-01 16:19:33 +01:00
parent bcd517299d
commit b93f385697
1 changed files with 58 additions and 0 deletions
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58
port/stm32-f4discovery-cc256x/src/port.c
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@ -360,3 +360,61 @@ void port_main(void){
// go
btstack_run_loop_execute();
}
#if 0
// Help with debugging hard faults - from FreeRTOS docu
// https://www.freertos.org/Debugging-Hard-Faults-On-Cortex-M-Microcontrollers.html
void prvGetRegistersFromStack( uint32_t *pulFaultStackAddress );
void prvGetRegistersFromStack( uint32_t *pulFaultStackAddress ) {
/* These are volatile to try and prevent the compiler/linker optimising them
away as the variables never actually get used. If the debugger won't show the
values of the variables, make them global my moving their declaration outside
of this function. */
volatile uint32_t r0;
volatile uint32_t r1;
volatile uint32_t r2;
volatile uint32_t r3;
volatile uint32_t r12;
volatile uint32_t lr; /* Link register. */
volatile uint32_t pc; /* Program counter. */
volatile uint32_t psr;/* Program status register. */
r0 = pulFaultStackAddress[ 0 ];
r1 = pulFaultStackAddress[ 1 ];
r2 = pulFaultStackAddress[ 2 ];
r3 = pulFaultStackAddress[ 3 ];
r12 = pulFaultStackAddress[ 4 ];
lr = pulFaultStackAddress[ 5 ];
pc = pulFaultStackAddress[ 6 ];
psr = pulFaultStackAddress[ 7 ];
/* When the following line is hit, the variables contain the register values. */
for( ;; );
}
/* The prototype shows it is a naked function - in effect this is just an
assembly function. */
void HardFault_Handler( void ) __attribute__( ( naked ) );
/* The fault handler implementation calls a function called
prvGetRegistersFromStack(). */
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 prvGetRegistersFromStack \n"
);
}
#endif