manual:ports:armcm3_stm32
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manual:ports:armcm3_stm32 [2019/09/24 22:12] 127.0.0.1 external edit |
manual:ports:armcm3_stm32 [2021/09/02 10:43] voorburg [Vector table location] |
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| Note that the space needed by the bootloader could be different than 0x2000 (8 kbyte), depending on the selected communication interface and compiler. The demo programs are working examples that you can refer to, to determine the exact vector table relocation. | Note that the space needed by the bootloader could be different than 0x2000 (8 kbyte), depending on the selected communication interface and compiler. The demo programs are working examples that you can refer to, to determine the exact vector table relocation. | ||
| - | Because the bootloader remaps the base address of the interrupt vector table, make sure that your program's initialization routine does not set it back to its original location. This is the case if you use function SystemInit() from ST's driver library. To correct this you need to remove the following lines from function SystemInit(): | + | Before the bootloader starts your firmware, it automatically reconfigured the start address of the interrupt vector table. Unfortunately, the default system initialization function SystemInit() from ST's driver library, overwrites this change. This function is implemented in source file system_stm32f1xx.c. To correct this you need to explicitly set the start address of the interrupt vector table as the first thing in function main(). Here is an example of how this can be done when using STM32CubeIDE: |
| - | <code> | + | Add the following function to main.c: |
| - | #ifdef VECT_TAB_SRAM | + | <code c> |
| + | static void VectorBase_Config(void) | ||
| + | { | ||
| + | /* The constant array with vectors of the vector table is declared externally in the | ||
| + | * c-startup code. | ||
| + | */ | ||
| + | extern const unsigned long g_pfnVectors[]; | ||
| - | SCB->VTOR = SRAM_BASE | VECT_TAB_OFFSET; /* Vector Table Relocation in Internal SRAM. */ | + | /* Remap the vector table to where the vector table is located for this program. */ |
| + | SCB->VTOR = (unsigned long)&g_pfnVectors[0]; | ||
| + | } | ||
| + | </code> | ||
| - | #else | + | And call this newly added function at the start of main(): |
| - | SCB->VTOR = FLASH_BASE | VECT_TAB_OFFSET; /* Vector Table Relocation in Internal FLASH. */ | + | <code c> |
| + | int main(void) | ||
| + | { | ||
| + | /* Configure the vector table base address. */ | ||
| + | VectorBase_Config(); | ||
| - | #endif | + | ... |
| + | } | ||
| </code> | </code> | ||
manual/ports/armcm3_stm32.txt · Last modified: 2022/11/07 11:27 by voorburg
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