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/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
2011,2012,2013 Giovanni Di Sirio.
This file is part of ChibiOS/RT.
ChibiOS/RT is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
ChibiOS/RT is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file i2s.h
* @brief I2S Driver macros and structures.
*
* @addtogroup I2S
* @{
*/
#ifndef _I2S_H_
#define _I2S_H_
#if HAL_USE_I2S || 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
* @param[in] n size of the transmit buffer, must be even and greater
* than zero
* @param[out] txbuf the pointer to the transmit buffer
* @param[out] rxbuf the pointer to the receive buffer
*
* @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 */
#endif /* _I2S_H_ */
/** @} */
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