neingeist
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arduinisten
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C

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