Re: [Paparazzi-devel] Libopencm3 - STM32-F1 change interrupt priority

[Michal Podhradsky]

Hi Esden,

thanks for clarification!

M

On Fri, Apr 19, 2013 at 4:01 PM, Piotr Esden-Tempski <address@hidden> wrote:

Hi Michal,

I think you are mistaking the vector table slot numbers there for priorities. These are the positions of the function pointers inside the vector table. If you change those numbers then things will obviously explode.

(just for reference, here the defines get their weak functions assigned: sw/ext/libopencm3/lib/stm32/f1/vector_nvic.c, and here the vector is being put together: sw/ext/libopencm3/lib/cm3/vector.c)

IRQ priorities are set using the NVIC_IPR register, or using nvic_set_priority function.

I hope this helps.

Cheers Esden

P.S. both files nvic.h and vector_nvic.c are generated using the sw/ext/libopencm3/scripts/irq2nvic_h from sw/ext/libopencm3/include/libopencm3/stm32/f1/irq.yaml so you should not edit those files by hand.

On Apr 19, 2013, at 2:12 PM, Michal Podhradsky <address@hidden> wrote:

> Hi folks,
>
> I have a question about interrupt priorities for STM32F1 chip (Lia 1.1/Lisa_M 2.0).
>
> In sw/ext/libopencm3/include/libopencm3/stm32/f1/nvic.h are defined priorities for user interrupts. However, if I try to change the priority for example for NVIC_USART2_IRQ (let's say make it higher priority than NVIC_USART1_IRQ), the  code compiles, but then the program hangs up instantly in usart_isr interrupt routine (debugged with JTAG).
>
> Can the priorities be set somewhere else or is it a feature to have "hardcoded" priorities?
>
> Thanks
> Michal

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