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/*
ChibiOS/HAL - Copyright (C) 2006-2014 Giovanni Di Sirio
Licensed 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.
*/
/**
* @file i2s_lld.h
* @brief PLATFORM I2S subsystem low level driver header.
*
* @addtogroup I2S
* @{
*/
#ifndef _I2S_LLD_H_
#define _I2S_LLD_H_
#if HAL_USE_I2S || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver constants. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver pre-compile time settings. */
/*===========================================================================*/
/**
* @name PLATFORM configuration options
* @{
*/
/**
* @brief I2S2 driver enable switch.
* @details If set to @p TRUE the support for I2S2 is included.
* @note The default is @p TRUE.
*/
#if !defined(PLATFORM_I2S_USE_I2S1) || defined(__DOXYGEN__)
#define PLATFORM_I2S_USE_I2S1 FALSE
#endif
/** @} */
/*===========================================================================*/
/* Derived constants and error checks. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver data structures and types. */
/*===========================================================================*/
/**
* @brief Type of a structure representing an I2S driver.
*/
typedef struct I2SDriver I2SDriver;
/**
* @brief I2S notification callback type.
*
* @param[in] i2sp pointer to the @p I2SDriver object
* @param[in] offset offset in buffers of the data to read/write
* @param[in] n number of samples to read/write
*/
typedef void (*i2scallback_t)(I2SDriver *i2sp, size_t offset, size_t n);
/**
* @brief Driver configuration structure.
* @note It could be empty on some architectures.
*/
typedef struct {
/**
* @brief Transmission buffer pointer.
* @note Can be @p NULL if TX is not required.
*/
const void *tx_buffer;
/**
* @brief Receive buffer pointer.
* @note Can be @p NULL if RX is not required.
*/
void *rx_buffer;
/**
* @brief TX and RX buffers size as number of samples.
*/
size_t size;
/**
* @brief Callback function called during streaming.
*/
i2scallback_t end_cb;
/* End of the mandatory fields.*/
} I2SConfig;
/**
* @brief Structure representing an I2S driver.
*/
struct I2SDriver {
/**
* @brief Driver state.
*/
i2sstate_t state;
/**
* @brief Current configuration data.
*/
const I2SConfig *config;
/* End of the mandatory fields.*/
};
/*===========================================================================*/
/* Driver macros. */
/*===========================================================================*/
/*===========================================================================*/
/* External declarations. */
/*===========================================================================*/
#if PLATFORM_I2S_USE_I2S1 && !defined(__DOXYGEN__)
extern I2SDriver I2SD1;
#endif
#ifdef __cplusplus
extern "C" {
#endif
void i2s_lld_init(void);
void i2s_lld_start(I2SDriver *i2sp);
void i2s_lld_stop(I2SDriver *i2sp);
void i2s_lld_start_exchange(I2SDriver *i2sp);
void i2s_lld_stop_exchange(I2SDriver *i2sp);
#ifdef __cplusplus
}
#endif
#endif /* HAL_USE_I2S */
#endif /* _I2S_LLD_H_ */
/** @} */
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