Problem using NVIC_SetVectorTable on StmF3Discovery

nefarius2001-stm · ‎2013-11-21

Posted on November 22, 2013 at 00:44

Hi there,

I've got a problem here using NVIC_SetVectorTable().

I have attached my test programm, which is held very simple and does:

- Init Leds&UserButton

- make sure the ''new'' Vectortable is 0x200-aligned

- Copy the VectorTable from 0 to MyVectTable (0x20000200)

- // at the moment deactivated: change Systick-vector so I can see the new one is used

- Activate Systick to have an interrupt occuring

- When the UserButton is pressed, call NVIC_SetVectorTable(NVIC_VectTab_RAM,(int) &MyIsrTable);

And then the program counter ends up at 0x0 (but I had other weired effects when I slightly changed the code, e.g. PC at 0x20000200 or running wildly somewhere)

I guess I am missing a small but important detail. Can anyone see it?

Cheers

Tesla DeLorean · ‎2013-11-21

Posted on November 22, 2013 at 01:13

>>NVIC_SetVectorTable(NVIC_VectTab_RAM,(int) &MyIsrTable);

&MyIsrTable doesn't point a what you think it does.

printf(''%p %p %p\n'',&MyIsrTable, MyIsrTable, &MyIsrTable[0]);

I'd perhaps prefer

NVIC_SetVectorTable((uint32_t)MyIsrTable, 0);

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nefarius2001-stm · ‎2013-11-22

Posted on November 22, 2013 at 16:22

Perfect, thanks a lot!

In the end, I'll probably just use

SCB->VTOR = (uint32_t)MyIsrTable; // SetVectorTable

Thanks!