Posted on January 29, 2017 at 22:51It means if I was really lost I'd add assembler code into the Reset_Handler to bring up LEDs and USARTs. The CPU however does appear to be functional, and clocking from the HSI.
The __main function is Keil's static initialization routine, it subsequently calls your main() function.
If __main is failing it suggests you have the memory map set up incorrectly, and it is having a problem using the SRAM.
If you Stop execution in the debugger where does it stop? In the Hard Fault Handler?
I would recommend you start by using the standard system_stm32f3xx.c and startup_stm32f3xx.s files, moving the code and breaking SystemInit() doesn't seem like a good plan.
At a minimum you want SystemInit() to enable the FPU, and set the vector table address into the SCB->VTOR register.
void SystemInit(void)
{
/* FPU settings ------------------------------------------------------------*/
♯ if (__FPU_PRESENT == 1) && (__FPU_USED == 1)
SCB->CPACR |= ((3UL << 10*2)|(3UL << 11*2)); /* set CP10 and CP11 Full Access */
♯ endif
/* Configure the Vector Table location add offset address ------------------*/
♯ ifdef VECT_TAB_SRAM
SCB->VTOR = SRAM_BASE | VECT_TAB_OFFSET; /* Vector Table Relocation in Internal SRAM */
♯ else
SCB->VTOR = FLASH_BASE | VECT_TAB_OFFSET; /* Vector Table Relocation in Internal FLASH */
♯ endif
}
