text: /****************************************************************************
   * examples/i2schar/i2schar_receiver.c
   *
   *   Copyright (C) 2013 Gregory Nutt. All rights reserved.
   *   Author: Gregory Nutt <gnutt@nuttx.org>
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   * 3. Neither the name NuttX nor the names of its contributors may be
   *    used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
   * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
   * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
   * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
   * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
   * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
   * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
   * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   * POSSIBILITY OF SUCH DAMAGE.
   *
   ****************************************************************************/
  
  /****************************************************************************
   * Included Files
   ****************************************************************************/
  
  #include <nuttx/config.h>
  
  #include <sys/types.h>
  #include <stdio.h>
  #include <fcntl.h>
  #include <pthread.h>
  #include <errno.h>
  #include <debug.h>
  
  #include <nuttx/audio/audio.h>
  
  #include "i2schar.h"
  
  #ifdef CONFIG_EXAMPLES_I2SCHAR_RX
  
  /****************************************************************************
   * Pre-processor Definitions
   ****************************************************************************/
  
  /****************************************************************************
   * Private Types
   ****************************************************************************/
  
  /****************************************************************************
   * Private Function Prototypes
   ****************************************************************************/
  
  /****************************************************************************
   * Private Data
   ****************************************************************************/
  
  /****************************************************************************
   * Public Data
   ****************************************************************************/
  
  /****************************************************************************
   * Private Functions
   ****************************************************************************/
  
  /****************************************************************************
   * Public Functions
   ****************************************************************************/
  
  /****************************************************************************
   * Name: i2schar_receiver()
   *
   * Description:
   *   This is the entry point for the receiver thread.
   *
   ****************************************************************************/
  
  pthread_addr_t i2schar_receiver(pthread_addr_t arg)
  {
    FAR struct ap_buffer_s *apb;
    struct audio_buf_desc_s desc;
    int bufsize;
    int nread;
    int ret;
    int fd;
    int i;
  
    /* Open the I2C character device */
  
    fd = open(g_i2schar.devpath, O_RDONLY);
    if (fd < 0)
      {
        int errcode = errno;
        printf("i2schar_receiver: ERROR: failed to open %s: %d\n",
                g_i2schar.devpath, errcode);
        pthread_exit(NULL);
      }
  
    /* Loop for the requested number of times */
  
    for (i = 0; i < CONFIG_EXAMPLES_I2SCHAR_TXBUFFERS; i++)
      {
        /* Allocate an audio buffer of the configured size */
  
        desc.numbytes   = CONFIG_EXAMPLES_I2SCHAR_BUFSIZE;
        desc.u.ppBuffer = &apb;
  
        ret = apb_alloc(&desc);
        if (ret < 0)
          {
             printf("i2schar_receiver: ERROR: failed to allocate buffer %d: %d\n",
                     i+1, ret);
             close(fd);
             pthread_exit(NULL);
          }
  
        bufsize = sizeof(struct ap_buffer_s) + CONFIG_EXAMPLES_I2SCHAR_BUFSIZE;
  
        /* Then receifve into the buffer */
  
        do
          {
            /* Flush any output before reading */
  
            fflush(stdout);
  
            /* Read the buffer to the I2S character driver */
  
            nread = read(fd, apb, bufsize);
            if (nread < 0)
              {
                int errcode = errno;
                if (errcode != EINTR)
                  {
                    printf("i2schar_receiver: ERROR: read failed: %d\n",
                            errcode);
                    close(fd);
                    pthread_exit(NULL);
                  }
              }
            else if (nread != bufsize)
              {
                printf("i2schar_receiver: ERROR: partial read: %d\n",
                        nread);
                close(fd);
                pthread_exit(NULL);
              }
            else
              {
                printf("i2schar_receiver: Received buffer %d\n", i+1);
              }
          }
        while (nread != bufsize);
  
        /* Make sure that the transmitter thread has a chance to run */
  
        pthread_yield();
      }
  
    close(fd);
    return NULL;
  }
  
  #endif /* CONFIG_EXAMPLES_I2SCHAR_RX */
  