chopstx/example-cdc/sample.c

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

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

chopstx_mutex_t usb_mtx;
chopstx_cond_t cnd_usb_connection;
chopstx_cond_t cnd_usb_buffer_ready;

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

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);
      chopstx_usec_wait (m);
      set_led (0);
      chopstx_usec_wait (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;
      chopstx_usec_wait (200*1000);
      v = 1;
      chopstx_usec_wait (200*1000);
    }

  return NULL;
}

#define INTR_REQ_USB 20

static void *
usb_intr (void *arg)
{
  extern void usb_lld_init (uint8_t feature);
  extern void usb_interrupt_handler (void);

  chopstx_intr_t interrupt;

  (void)arg;
  asm volatile ("cpsid   i" : : : "memory");
  /* Disable because of usb_lld_init assumes interrupt handler.  */
  usb_lld_init (0x80);		/* Bus powered. */
  chopstx_claim_irq (&interrupt, INTR_REQ_USB);
  /* Enable */
  asm volatile ("cpsie   i" : : : "memory");

  while (1)
    {
      chopstx_intr_wait (&interrupt);

      /* Process interrupt. */
      usb_interrupt_handler ();
    }

  chopstx_release_irq (&interrupt);
  return NULL;
}

#define PRIO_PWM 3
#define PRIO_BLK 2
#define PRIO_INTR 4

extern uint8_t __process1_stack_base__, __process1_stack_size__;
extern uint8_t __process2_stack_base__, __process2_stack_size__;
extern uint8_t __process3_stack_base__, __process3_stack_size__;

const uint32_t __stackaddr_pwm = (uint32_t)&__process1_stack_base__;
const size_t __stacksize_pwm = (size_t)&__process1_stack_size__;

const uint32_t __stackaddr_blk = (uint32_t)&__process2_stack_base__;
const size_t __stacksize_blk = (size_t)&__process2_stack_size__;

const uint32_t __stackaddr_intr = (uint32_t)&__process3_stack_base__;
const size_t __stacksize_intr = (size_t)&__process3_stack_size__;


int
main (int argc, const char *argv[])
{
  chopstx_t thd;
  chopstx_attr_t attr;

  (void)argc;
  (void)argv;

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

  chopstx_mutex_init (&usb_mtx);
  chopstx_cond_init (&cnd_usb_connection);
  chopstx_cond_init (&cnd_usb_buffer_ready);

  m = 10;

  chopstx_attr_init (&attr);
  chopstx_attr_setschedparam (&attr, PRIO_PWM);
  chopstx_attr_setstack (&attr, __stackaddr_pwm, __stacksize_pwm);

  chopstx_create (&thd, &attr, pwm, NULL);

  chopstx_attr_setschedparam (&attr, PRIO_BLK);
  chopstx_attr_setstack (&attr, __stackaddr_blk, __stacksize_blk);

  chopstx_create (&thd, &attr, blk, NULL);

  chopstx_attr_setschedparam (&attr, PRIO_INTR);
  chopstx_attr_setstack (&attr, __stackaddr_intr, __stacksize_intr);

  chopstx_create (&thd, &attr, usb_intr, NULL);

  chopstx_usec_wait (200*1000);

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

  while (1)
    {
      extern uint8_t connected;

      /* waiting USB connection */
      chopstx_mutex_lock (&usb_mtx);
      if (!connected)
	chopstx_cond_wait (&cnd_usb_connection, &usb_mtx);
      chopstx_mutex_unlock (&usb_mtx);

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

	  usb_lld_write (ENDP1, "Hello, World with Chopstx!\r\n", 28);
	  chopstx_mutex_lock (&usb_mtx);
	  chopstx_cond_wait (&cnd_usb_buffer_ready, &usb_mtx);
	  if (!connected)
	    break;
	  chopstx_mutex_unlock (&usb_mtx);
	}
      chopstx_mutex_unlock (&usb_mtx);
    }

  return 0;
}