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/*
ChibiOS - Copyright (C) 2006..2016 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.h
* @brief I2S Driver macros and structures.
*
* @addtogroup I2S
* @{
*/
#ifndef _I2S_H_
#define _I2S_H_
#if (HAL_USE_I2S == TRUE) || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver constants. */
/*===========================================================================*/
/**
* @name I2S modes
* @{
*/
#define I2S_MODE_SLAVE 0
#define I2S_MODE_MASTER 1
/** @} */
/*===========================================================================*/
/* Driver pre-compile time settings. */
/*===========================================================================*/
/*===========================================================================*/
/* Derived constants and error checks. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver data structures and types. */
/*===========================================================================*/
/**
* @brief Driver state machine possible states.
*/
typedef enum {
I2S_UNINIT = 0, /**< Not initialized. */
I2S_STOP = 1, /**< Stopped. */
I2S_READY = 2, /**< Ready. */
I2S_ACTIVE = 3, /**< Active. */
I2S_COMPLETE = 4 /**< Transmission complete. */
} i2sstate_t;
#include "i2s_lld.h"
/*===========================================================================*/
/* Driver macros. */
/*===========================================================================*/
/**
* @name Macro Functions
* @{
*/
/**
* @brief Starts a I2S data exchange.
*
* @param[in] i2sp pointer to the @p I2SDriver object
*
* @iclass
*/
#define i2sStartExchangeI(i2sp) { \
i2s_lld_start_exchange(i2sp); \
(i2sp)->state = I2S_ACTIVE; \
}
/**
* @brief Stops the ongoing data exchange.
* @details The ongoing data exchange, if any, is stopped, if the driver
* was not active the function does nothing.
*
* @param[in] i2sp pointer to the @p I2SDriver object
*
* @iclass
*/
#define i2sStopExchangeI(i2sp) { \
i2s_lld_stop_exchange(i2sp); \
(i2sp)->state = I2S_READY; \
}
/**
* @brief Common ISR code, half buffer event.
* @details This code handles the portable part of the ISR code:
* - Callback invocation.
* .
* @note This macro is meant to be used in the low level drivers
* implementation only.
*
* @param[in] i2sp pointer to the @p I2CDriver object
*
* @notapi
*/
#define _i2s_isr_half_code(i2sp) { \
if ((i2sp)->config->end_cb != NULL) { \
(i2sp)->config->end_cb(i2sp, 0, (i2sp)->config->size / 2); \
} \
}
/**
* @brief Common ISR code.
* @details This code handles the portable part of the ISR code:
* - Callback invocation.
* - Driver state transitions.
* .
* @note This macro is meant to be used in the low level drivers
* implementation only.
*
* @param[in] i2sp pointer to the @p I2CDriver object
*
* @notapi
*/
#define _i2s_isr_full_code(i2sp) { \
if ((i2sp)->config->end_cb) { \
(i2sp)->state = I2S_COMPLETE; \
(i2sp)->config->end_cb(i2sp, \
(i2sp)->config->size / 2, \
(i2sp)->config->size / 2); \
if ((i2sp)->state == I2S_COMPLETE) \
(i2sp)->state = I2S_READY; \
} \
else \
(i2sp)->state = I2S_READY; \
}
/** @} */
/*===========================================================================*/
/* External declarations. */
/*===========================================================================*/
#ifdef __cplusplus
extern "C" {
#endif
void i2sInit(void);
void i2sObjectInit(I2SDriver *i2sp);
void i2sStart(I2SDriver *i2sp, const I2SConfig *config);
void i2sStop(I2SDriver *i2sp);
void i2sStartExchange(I2SDriver *i2sp);
void i2sStopExchange(I2SDriver *i2sp);
#ifdef __cplusplus
}
#endif
#endif /* HAL_USE_I2S == TRUE */
#endif /* _I2S_H_ */
/** @} */
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