Posted on May 10, 2018 at 19:29 To address somewhat the question posed privately, related to this thread...
https://community.st.com/0D50X00009XkYIfSAN
On the loader side the control transfer is accomplished in this manner, ideally without all interrupts up and firing.
/* Define the address from where user application will be loaded.
Note: the sectors 0x08000000-0x08007FFF are reserved for the IAP/Loader code */
#define APPLICATION_ADDRESS (uint32_t)0x08008000
extern pFunction Jump_To_Application;
extern uint32_t JumpAddress;
/* Test if user code is programmed starting from address 'APPLICATION_ADDRESS' */
if (((*(__IO uint32_t*)APPLICATION_ADDRESS) & 0xFFFE0000 ) == 0x20000000) // Stack is in RAM, rough test
{
/* Jump to user application */
JumpAddress = *(__IO uint32_t*) (APPLICATION_ADDRESS + 4);
Jump_To_Application = (pFunction) JumpAddress;
/* Initialize user application's Stack Pointer */
__set_MSP(*(__IO uint32_t*) APPLICATION_ADDRESS);
Jump_To_Application();
}
On the application side of the fence
/*!< Uncomment the following line if you need to relocate your vector Table in
Internal SRAM. */
/* #define VECT_TAB_SRAM */
#define VECT_TAB_OFFSET 0x8000 /*!< Vector Table base offset field.
This value must be a multiple of 0x */
/**
* @brief Setup the microcontroller system
* Initialize the Embedded Flash Interface, the PLL and update the
* SystemFrequency variable.
* @param None
* @retval None
*/
void SystemInit(void)
{
...
/* 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
}
or simply
SCB->VTOR = APPLICATION_ADDRESS;
