chopstx/example-cdc/sample.c

#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <chopstx.h>

#include "sys.h" /* for set_led */
#include "usb_lld.h"
#include "stream.h"

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 *
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;
#if defined(OLDER_SYS_H)
  /*
   * Historically (before sys < 3.0), NVIC priority setting for USB
   * interrupt was done in usb_lld_sys_init.  Thus this code.
   *
   * When USB interrupt occurs between usb_lld_init (which assumes
   * ISR) and chopstx_claim_irq (which clears pending interrupt),
   * invocation of usb_interrupt_handler won't occur.
   *
   * Calling usb_interrupt_handler is no harm even if there were no
   * interrupts, thus, we call it unconditionally here, just in case
   * if there is a request.
   *
   * We can't call usb_lld_init after chopstx_claim_irq, as
   * usb_lld_init does its own setting for NVIC.  Calling
   * chopstx_claim_irq after usb_lld_init overrides that.
   *
   */
  usb_lld_init (0x80);		/* Bus powered. */
  chopstx_claim_irq (&interrupt, INTR_REQ_USB);
  usb_interrupt_handler ();
#else
  chopstx_claim_irq (&interrupt, INTR_REQ_USB);
  usb_lld_init (0x80);		/* Bus powered. */
#endif

  while (1)
    {
      chopstx_intr_wait (&interrupt);

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

  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__;


static char hexchar (uint8_t x)
{
  x &= 0x0f;
  if (x <= 0x09)
    return '0' + x;
  else if (x <= 0x0f)
    return 'a' + x - 10;
  else
    return '?';
}


static int
check_recv (void *arg)
{
  struct stream *s = arg;
  if ((s->flags & FLAG_CONNECTED) == 0)
    return 1;
  if ((s->flags & FLAG_RECV_AVAIL))
    return 1;
  return 0;
}


int
main (int argc, const char *argv[])
{
  struct stream *st;
  uint8_t count;
  extern uint32_t bDeviceState;

  (void)argc;
  (void)argv;

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

  st = stream_open ();

  m = 10;

  chopstx_create (PRIO_PWM, __stackaddr_pwm, __stacksize_pwm, pwm, NULL);
  chopstx_create (PRIO_BLK, __stackaddr_blk, __stacksize_blk, blk, NULL);
  chopstx_create (PRIO_INTR, __stackaddr_intr, __stacksize_intr,
		  usb_intr, NULL);

  chopstx_usec_wait (200*1000);

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

  u = 1;
  while (bDeviceState != CONFIGURED)
    chopstx_usec_wait (500*1000);

  count = 0;
  while (1)
    {
      uint8_t s[64];

      u = 1;
      if (stream_wait_connection (st) < 0)
	{
	  chopstx_usec_wait (1000*1000);
	  continue;
	}

      chopstx_usec_wait (500*1000);

      /* Send ZLP at the beginning.  */
      stream_send (st, s, 0);

      memcpy (s, "xx: Hello, World with Chopstx!\r\n", 32);
      s[0] = hexchar (count >> 4);
      s[1] = hexchar (count & 0x0f);
      count++;

      if (stream_send (st, s, 32) < 0)
	continue;

      while (1)
	{
	  int size;
	  uint32_t usec;
	  struct chx_poll_cond poll_desc;

	  poll_desc.type = CHOPSTX_POLL_COND;
	  poll_desc.ready = 0;
	  poll_desc.cond = &st->cnd;
	  poll_desc.mutex = &st->mtx;
	  poll_desc.check = check_recv;
	  poll_desc.arg = st;

	  /* With chopstx_poll, we can do timed cond_wait */
	  usec = 3000000;	/* 3.0 seconds */
	  if (chopstx_poll (&usec, 1, &poll_desc))
	    {
	      size = stream_recv (st, s + 4);

	      if (size < 0)
		break;

	      if (size >= 0)
		{
		  s[0] = hexchar (size >> 4);
		  s[1] = hexchar (size & 0x0f);
		  s[2] = ':';
		  s[3] = ' ';
		  s[size + 4] = '\r';
		  s[size + 5] = '\n';
		  if (stream_send (st, s, size + 6) < 0)
		    break;
		}
	    }

	  u ^= 1;
	}
    }

  return 0;
}