Posted on October 27, 2016 at 09:45Hi,
I've read a ton of forum posts here regarding hard fault error encountered when jumping from custom BL to App. But, in my case, it's working fine the first time I did the jump to App. But, when I jump back to BL and then jump back to App, the code will encounter a hard fault error in the Appcode before it enters main() function.
The sequence is like this: Reset - Bootloader - Jump to App - Jump to Bootloader - Jump to App (but the app main() never execute this time due to hard fault error).
I tried removing the freertos in the appcode and the above sequence worked fine. But I need to make it work with freertos.
Any idea what could be the problem here? I suppose the vector table, jump addresses are correct since they worked fine the first time. I'm also disabling the interrupt, setting the stack pointer, before I do the jump.
Here's the code snippet:
void jumpToUserCode(void)
{
/* Create pointer to usrmain address*/
typedef void (*funcEntryPtr)(void);
uint32_t jumpAddr = *(volatile uint32_t*)(APP_ADDRESS + 0x04); /*First word is the SP value, next word is the reset vectore*/
funcEntryPtr usrMain = (funcEntryPtr) jumpAddr; /*jumpAddr typecasted*/
/*Shut down any tasks running*/
//HAL_RCC_DeInit();
//HAL_SPI_DeInit(&hspi1);
//HAL_DeInit();
/*reset the SysTick Timer*/
SysTick->CTRL=0;
SysTick->LOAD=0;
SysTick->VAL=0;
SysTick->CTRL &= ~(SysTick_CTRL_TICKINT_Msk | SysTick_CTRL_ENABLE_Msk);
SysTick->CTRL = SysTick_CTRL_CLKSOURCE_Msk | SysTick_CTRL_ENABLE_Msk; /*disable systick interrupt*/
HAL_FLASH_Lock();
__disable_irq();
__set_PRIMASK(1);
/*Setting vector table to APP VTOR*/
//SCB->VTOR = APP_ADDRESS;
/*Setting main stack pointer to APP_ADDRESS*/
__set_MSP(*(uint32_t*) APP_ADDRESS);/*Stack pointer (RAM value) default*/
/*Call firmware at jumpaddr (from pointer above)*/
usrMain();
}
void jumpToBootCode(void)
{
/* Create pointer to usrmain address*/
typedef void (*funcEntryPtr)(void);
uint32_t jumpAddr = *(volatile uint32_t*)(BOOT_ADDRESS + 0x04); /*First word is the SP value, next word is the reset vector*/
funcEntryPtr usrBoot = (funcEntryPtr) jumpAddr; /*jumpAddr typecasted*/
/*Shut down any tasks running*/
osThreadSuspendAll();
//HAL_RCC_DeInit();
//HAL_SPI_DeInit(&hspi1);
//HAL_DeInit();
/*reset the SysTick Timer*/
SysTick->CTRL=0;
SysTick->LOAD=0;
SysTick->VAL=0;
SysTick->CTRL &= ~(SysTick_CTRL_TICKINT_Msk | SysTick_CTRL_ENABLE_Msk);
SysTick->CTRL = SysTick_CTRL_CLKSOURCE_Msk | SysTick_CTRL_ENABLE_Msk; /*disable systick interrupt*/
HAL_FLASH_Lock();
__disable_irq();
__set_PRIMASK(1);
/*Setting vector table to BOOT VTOR*/
//SCB->VTOR = BOOT_ADDRESS;
/*Setting main stack pointer to BOOT SP*/
__set_MSP(*(uint32_t*) BOOT_ADDRESS);/*Stack pointer (RAM value) default*/
/*Call firmware at jumpaddr (from pointer above)*/
usrBoot();
}
#!stm32-!bootloader
