Hi,
Please help me sort this out.
I am trying to port a custom bootloader originally written for the SAMD21 Arm chip to the STM32U385VGT6. We are upgrading our current product with an STM32 Chip. I am having problems with switching from the bootloader to the application binary. My bootloader is loaded at address 0x08000000. The application binary is compiled to run from 0x08010000. I edited the linker script files to locate the binaries properly and tested opening the binary file with a hex editor. All seems situated correctly. Here is my function to jump to the application. APP_CODE_START is set to 0x08010000. I get "jumping to application" in my debug terminal. But the application code is not running.
void jumpToApplication()
{ DEV_DEBUG_LOG("jumping to application");
// Disable interrupts before changing MSP and VTOR
__disable_irq();
// Jump to the sketch
__set_MSP(*((uint32_t *)APP_CODE_START));
// Reset vector table address
SCB->VTOR = ((uint32_t)(APP_CODE_START)&SCB_VTOR_TBLOFF_Msk);
// Address of Reset_Handler is written by the linker at the beginning of the .text section.
uint32_t resetHandlerAddress = *((uint32_t *)APP_CODE_START + 1);
if (resetHandlerAddress < APP_CODE_START || resetHandlerAddress > (APP_CODE_START + APP_CODE_SIZE)) {
//this will later cause watchdog reset
while(1);
}
// Jump to application
void (*app_reset_handler)(void) = (void (*)(void))resetHandlerAddress;
app_reset_handler();
}
