/****************************************************************************
* examples/i2schar/i2schar_transmitter.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_TX
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/****************************************************************************
* Private Types
****************************************************************************/
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Public Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: i2schar_transmitter()
*
* Description:
* This is the entry point for the transmitter thread.
*
****************************************************************************/
pthread_addr_t i2schar_transmitter(pthread_addr_t arg)
{
FAR struct ap_buffer_s *apb;
struct audio_buf_desc_s desc;
uint8_t crap;
uint8_t *ptr;
int bufsize;
int nwritten;
int ret;
int fd;
int i;
int j;
/* Open the I2C character device */
fd = open(g_i2schar.devpath, O_WRONLY);
if (fd < 0)
{
int errcode = errno;
printf("i2schar_transmitter: ERROR: failed to open %s: %d\n",
g_i2schar.devpath, errcode);
pthread_exit(NULL);
}
/* Loop for the requested number of times */
for (i = 0, crap = 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_transmitter: 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;
/* Fill the audio buffer with crap */
for (j = 0, ptr = apb->samp; j < CONFIG_EXAMPLES_I2SCHAR_BUFSIZE; j++)
{
*ptr++ = crap++;
}
apb->nbytes = CONFIG_EXAMPLES_I2SCHAR_BUFSIZE;
/* Then send the buffer */
do
{
/* Flush any output before writing */
fflush(stdout);
/* Write the buffer to the I2S character driver */
nwritten = write(fd, apb, bufsize);
if (nwritten < 0)
{
int errcode = errno;
if (errcode != EINTR)
{
printf("i2schar_transmitter: ERROR: write failed: %d\n",
errcode);
close(fd);
pthread_exit(NULL);
}
}
else if (nwritten != bufsize)
{
printf("i2schar_transmitter: ERROR: partial write: %d\n",
nwritten);
close(fd);
pthread_exit(NULL);
}
else
{
printf("i2schar_transmitter: Send buffer %d\n", i+1);
}
}
while (nwritten != bufsize);
/* Make sure that the receiver thread has a chance to run */
pthread_yield();
}
close(fd);
return NULL;
}
#endif /* CONFIG_EXAMPLES_I2SCHAR_TX */
