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89 lines
1.8 KiB
C
89 lines
1.8 KiB
C
/* based on example-small.c in the protothreads tarball */
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#include "avr/io.h"
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#include "util/delay.h"
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#include "pt.h"
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#include "clock.h"
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#include "timer.h"
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/* TIMER_DELAY macro for convenience, do { } while(0) is just a macro trick */
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#define TIMER_DELAY(pt, timer, t) \
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do { \
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timer_set(&timer, t); \
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PT_WAIT_UNTIL(pt, timer_expired(&timer)); \
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} while(0)
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/* Two timers for the two protothreads. */
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static struct timer timer1, timer2;
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static int
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protothread1(struct pt *pt)
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{
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/* A protothread function must begin with PT_BEGIN() which takes a
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pointer to a struct pt. */
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PT_BEGIN(pt);
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/* We loop forever here. */
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while(1) {
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PORTB |= _BV(PB3);
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TIMER_DELAY(pt, timer1, 20);
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PORTB &= ~_BV(PB3);
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TIMER_DELAY(pt, timer1, 20);
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/* And we loop. */
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}
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/* All protothread functions must end with PT_END() which takes a
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pointer to a struct pt. */
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PT_END(pt);
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}
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static int
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protothread2(struct pt *pt)
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{
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/* A protothread function must begin with PT_BEGIN() which takes a
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pointer to a struct pt. */
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PT_BEGIN(pt);
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/* We loop forever here. */
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while(1) {
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PORTB |= _BV(PB2);
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TIMER_DELAY(pt, timer2, 60);
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PORTB &= ~_BV(PB2);
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TIMER_DELAY(pt, timer2, 60);
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/* And we loop. */
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}
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/* All protothread functions must end with PT_END() which takes a
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pointer to a struct pt. */
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PT_END(pt);
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}
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static struct pt pt1, pt2;
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int main(void) {
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// pin 11 = PB3
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DDRB |= _BV(PB3);
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// pin 10 = PB2
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DDRB |= _BV(PB2);
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/* Initialize clock */
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clock_init();
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/* Initialize the protothread state variables with PT_INIT(). */
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PT_INIT(&pt1);
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PT_INIT(&pt2);
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/*
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* Then we schedule the two protothreads by repeatedly calling their
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* protothread functions and passing a pointer to the protothread
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* state variables as arguments.
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*/
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while(1) {
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protothread1(&pt1);
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protothread2(&pt2);
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}
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}
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