Brooklyn/gnuk/chopstx/example-led/sample.c

#include <stdint.h>
#include <stdlib.h>
#include <chopstx.h>
#include "sys.h" /* for set_led */

static chopstx_mutex_t mtx;
static chopstx_cond_t cnd0;
static chopstx_cond_t cnd1;

static uint8_t u, v;
static uint8_t m;		/* 0..100 */

static void
wait_for (uint32_t usec)
{
#if defined(BUSY_LOOP)
  uint32_t count = usec * 6;
  uint32_t i;

  for (i = 0; i < count; i++)
    asm volatile ("" : : "r" (i) : "memory");
#else
  chopstx_usec_wait (usec);
#endif
}

static void *
pwm (void *arg)
{
  (void)arg;

  chopstx_mutex_lock (&mtx);
  chopstx_cond_wait (&cnd0, &mtx);
  chopstx_mutex_unlock (&mtx);

  while (1)
    {
      set_led (u&v);
      wait_for (m);
      set_led (0);
      wait_for (100-m);
    }

  return NULL;
}

static void *
blk (void *arg)
{
  (void)arg;

  chopstx_mutex_lock (&mtx);
  chopstx_cond_wait (&cnd1, &mtx);
  chopstx_mutex_unlock (&mtx);

  while (1)
    {
      v = 0;
      wait_for (200*1000);
      v = 1;
      wait_for (200*1000);
    }

  return NULL;
}

#if defined(BUSY_LOOP)
#define PRIO_PWM (CHOPSTX_SCHED_RR|1)
#define PRIO_BLK (CHOPSTX_SCHED_RR|1)
#else
#define PRIO_PWM 3
#define PRIO_BLK 2
#endif

#define STACK_MAIN
#define STACK_PROCESS_1
#define STACK_PROCESS_2
#include "stack-def.h"


#define STACK_ADDR_PWM ((uint32_t)process1_base)
#define STACK_SIZE_PWM (sizeof process1_base)

#define STACK_ADDR_BLK ((uint32_t)process2_base)
#define STACK_SIZE_BLK (sizeof process2_base)


int
main (int argc, const char *argv[])
{
  (void)argc;
  (void)argv;

  chopstx_mutex_init (&mtx);
  chopstx_cond_init (&cnd0);
  chopstx_cond_init (&cnd1);

  m = 10;

  chopstx_create (PRIO_PWM, STACK_ADDR_PWM, STACK_SIZE_PWM, pwm, NULL);
  chopstx_create (PRIO_BLK, STACK_ADDR_BLK, STACK_SIZE_BLK, blk, NULL);

  chopstx_usec_wait (200*1000);

  chopstx_mutex_lock (&mtx);
  chopstx_cond_signal (&cnd0);
  chopstx_cond_signal (&cnd1);
  chopstx_mutex_unlock (&mtx);

  while (1)
    {
      u ^= 1;
      wait_for (200*1000*6);
    }

  return 0;
}