There are a number of options available to Tim2 - A good read of the
reference guide is required. Alternatively, if you just want a periodic
interrupt why not use systick - it is much simpler (doesn't even require
ack'ing the irq)
f.
On 15 January 2014 16:24, skeezix <[email protected]> wrote:
> On Wed, 15 Jan 2014, Frank Duignan wrote:
>
> # 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.
>
> The entirety of the timer set up is here:
> static void timer2_setup ( void ) {
>
> /* Set timer start value. */
> TIM_CNT(TIM2) = 1;
>
> /* Set timer prescaler. 72MHz/1440 => 50000 counts per second. */
> TIM_PSC(TIM2) = 20000; // 120M/2000 = 60k/second
>
> /* End timer value. If this is reached an interrupt is generated. */
> TIM_ARR(TIM2) = 600;
>
> /* Update interrupt enable. */
> TIM_DIER(TIM2) |= TIM_DIER_UIE;
>
> //timer_set_repetition_counter ( TIM2, 100 );
>
> /* Start timer. */
> TIM_CR1(TIM2) |= TIM_CR1_CEN;
>
> return;
> }
>
> Notice that with these values plugged in it should be occuring a few times
> a second .. hardly fast, so it shouldn't be invoking too quickly. But that
> is a concern.. one of the many registrer settings is left default and
> incorrect, and causinf some mischief :)
>
> Theres a lot of mode options, I'm not really clear what I need to
> set/unset beyond the above which stand out.
>
> --
> If everyone would put barbecue sauce on their food, there would be no war.
>
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