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atmega timer: Interrupt Pin #9025

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merged 1 commit into from
Jul 19, 2018
Merged

atmega timer: Interrupt Pin #9025

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23 changes: 23 additions & 0 deletions cpu/atmega_common/periph/timer.c
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Original file line number Diff line number Diff line change
Expand Up @@ -83,6 +83,21 @@ static ctx_t ctx[] = {
*/
int timer_init(tim_t tim, unsigned long freq, timer_cb_t cb, void *arg)
{
/*
* A debug pin can be used to probe timer interrupts with an oscilloscope or
* other time measurement equipment. Thus, determine when an interrupt occurs
* and how long the timer ISR takes.
* The pin should be defined in the makefile as follows:
* CFLAGS += -DDEBUG_TIMER_PORT=PORTF -DDEBUG_TIMER_DDR=DDRF \
* -DDEBUG_TIMER_PIN=PORTF4
*/
#if defined(DEBUG_TIMER_PORT)
DEBUG_TIMER_DDR |= (1 << DEBUG_TIMER_PIN);
DEBUG_TIMER_PORT &= ~(1 << DEBUG_TIMER_PIN);
DEBUG("Debug Pin: DDR 0x%02x Port 0x%02x Pin 0x%02x\n",
&DEBUG_TIMER_DDR , &DEBUG_TIMER_PORT,(1<<DEBUG_TIMER_PIN));
#endif

DEBUG("timer.c: freq = %ld\n", freq);
uint8_t pre = 0;

Expand Down Expand Up @@ -162,11 +177,19 @@ void timer_start(tim_t tim)
#ifdef TIMER_NUMOF
static inline void _isr(tim_t tim, int chan)
{
#if defined(DEBUG_TIMER_PORT)
DEBUG_TIMER_PORT |= (1 << DEBUG_TIMER_PIN);
#endif

__enter_isr();

*ctx[tim].mask &= ~(1 << (chan + OCIE1A));
ctx[tim].cb(ctx[tim].arg, chan);

#if defined(DEBUG_TIMER_PORT)
DEBUG_TIMER_PORT &= ~(1 << DEBUG_TIMER_PIN);
#endif

__exit_isr();
}
#endif
Expand Down