examples/i2schar/i2schar.h

/****************************************************************************
 * apps/examples/i2schar/i2schar.h
 *
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.  The
 * ASF licenses this file to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance with the
 * License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
 * License for the specific language governing permissions and limitations
 * under the License.
 *
 ****************************************************************************/

#ifndef __APPS_EXAMPLES_I2SCHAR_I2SCHAR_H
#define __APPS_EXAMPLES_I2SCHAR_I2SCHAR_H

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <nuttx/config.h>
#include <pthread.h>

/****************************************************************************
 * Pre-processor Definitions
 ****************************************************************************/

/* Configuration ************************************************************/

/* CONFIG_EXAMPLES_I2SCHAR_DEVPATH - The default path to the I2S character
 *   device. Default: /dev/i2schar0
 */

#ifndef CONFIG_AUDIO_I2SCHAR
#  error "I2S character device support is not enabled (CONFIG_AUDIO_I2SCHAR)"
#endif

#ifndef CONFIG_EXAMPLES_I2SCHAR_DEVPATH
#  define CONFIG_EXAMPLES_I2SCHAR_DEVPATH "/dev/is2char0"
#endif

#ifdef CONFIG_EXAMPLES_I2SCHAR_TX
#  ifndef CONFIG_EXAMPLES_I2SCHAR_TXBUFFERS
#    define CONFIG_EXAMPLES_I2SCHAR_TXBUFFERS 4
#  endif
#  ifndef CONFIG_EXAMPLES_I2SCHAR_TXSTACKSIZE
#    define CONFIG_EXAMPLES_I2SCHAR_TXSTACKSIZE 1536
#  endif
#else
#  undef CONFIG_EXAMPLES_I2SCHAR_TXBUFFERS
#  define CONFIG_EXAMPLES_I2SCHAR_TXBUFFERS 0
#endif

#ifdef CONFIG_EXAMPLES_I2SCHAR_RX
#  ifndef CONFIG_EXAMPLES_I2SCHAR_RXBUFFERS
#    define CONFIG_EXAMPLES_I2SCHAR_RXBUFFERS 4
#  endif
#  ifndef CONFIG_EXAMPLES_I2SCHAR_RXSTACKSIZE
#    define CONFIG_EXAMPLES_I2SCHAR_RXSTACKSIZE 1536
#  endif
#else
#  undef CONFIG_EXAMPLES_I2SCHAR_RXBUFFERS
#  define CONFIG_EXAMPLES_I2SCHAR_RXBUFFERS 0
#endif

#ifndef CONFIG_EXAMPLES_I2SCHAR_BUFSIZE
#   efine CONFIG_EXAMPLES_I2SCHAR_BUFSIZE 256
#endif

/****************************************************************************
 * Public Types
 ****************************************************************************/

struct i2schar_state_s
{
  bool      initialized;
  FAR char *devpath;
#ifdef CONFIG_EXAMPLES_I2SCHAR_TX
  int       txcount;
#endif
#ifdef CONFIG_EXAMPLES_I2SCHAR_RX
  int       rxcount;
#endif
};

/****************************************************************************
 * Public Data
 ****************************************************************************/

extern struct i2schar_state_s g_i2schar;

/****************************************************************************
 * Public Function Prototypes
 ****************************************************************************/

/****************************************************************************
 * Name: i2schar_devinit()
 *
 * Description:
 *   Perform architecture-specific initialization of the I2s hardware and
 *   registration of the I2S character driver CHAR hardware.  If
 *   CONFIG_EXAMPLES_I2SCHAR_DEVINIT is defined, then board-specific logic
 *   must provide this function.
 *
 ****************************************************************************/

#ifdef CONFIG_EXAMPLES_I2SCHAR_DEVINIT
int i2schar_devinit(void);
#endif

/****************************************************************************
 * Name: i2schar_transmitter()
 *
 * Description:
 *   This is the entry point for the transmitter thread.
 *
 ****************************************************************************/

#ifdef CONFIG_EXAMPLES_I2SCHAR_TX
pthread_addr_t i2schar_transmitter(pthread_addr_t arg);
#endif

/****************************************************************************
 * Name: i2schar_receiver()
 *
 * Description:
 *   This is the entry point for the receiver thread.
 *
 ****************************************************************************/

#ifdef CONFIG_EXAMPLES_I2SCHAR_RX
pthread_addr_t i2schar_receiver(pthread_addr_t arg);
#endif

#endif /* __APPS_EXAMPLES_I2SCHAR_I2SCHAR_H */