On STM32F103 and other microcontrollers with cortex-m3/m4 cores, the interrupt vector table can be redefined by setting the value of the register SCB->VTOR = FLASH_BASE | VECT_TAB_OFFSET;. However, in the STM32F0xx series microcontrollers with cortex-m0 as the core, the register for setting the interrupt vector table cannot be found. The following method can be used to redefine the interrupt vector table.
Basic idea:
1. Put the interrupt vector table into the starting address of RAM (just keep the actual address of RAM 0x100 unused in the application).
2. Copy the interrupt vector table of the application from Flash to SRAM in bootload.
3. Copy the STM32F0 interrupt vector table located in SRAM
The specific implementation code is as follows:
static void JumpToApp(void)
{
ApplicationAddress = APP_FLASHADDR;
if (((*(uint32_t*)ApplicationAddress) & 0x2FFE0000 ) == 0x20000000)
{
m_JumpAddress = *(uint32_t*) (ApplicationAddress + 4);
JumpToApplication = (FunVoidType) m_JumpAddress;
__set_MSP(*(uint32_t*) ApplicationAddress);
JumpToApplication();
}
}
int main(void)
{
memcpy((void*)0x20000000, (void*)APP_FLASHADDR, 0x100);
SYSCFG->CFGR1 |= 0x03;
JumpToApp();
while (1);
}
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