More likely the interrupt is tail-chaining (re-entering immediately) and
this is happening so quickly that the port has no time to react. What mode
is the timer set to? I.e Interrupt on what, does it auto clear etc.
f.
On 15 January 2014 15:49, skeezix <[email protected]> wrote:
> On Wed, 15 Jan 2014, skeezix wrote:
>
> # Continuing the hunt ..
>
> Newest finding..
>
> If I twiddle the isr function around a bit, and make it _last
> longer_, everything is peachy. Of note:
>
> void tim2_isr ( void ) {
>
> TIM_SR(TIM2) &= ~TIM_SR_UIF; /* Clear interrrupt flag. */
>
> unsigned long int j;
> for ( j = 0; j < 100; j++ ) {
> __asm__("nop");
> }
>
> gpio_toggle(GPIOC, GPIO3); /* LED on/off. */
>
> }
>
> The 'clear the interupt' bit has to be first thing; moving it to
> bottom (where it 'feels right') breaks everything.
>
> The delay needs to be there.. _something_; just a few NOPs, or the
> volatile assignment, or something.
>
> Guess: is it double-calling, and thus needs to block itself so it
> doesn't "double toggle" and look to do nothing? ..
>
> .. we're slowly getting there, but w-t-heck :)
>
> jeff
>
> --
> If everyone would put barbecue sauce on their food, there would be no war.
>
>
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