241 lines
7.6 KiB
C
241 lines
7.6 KiB
C
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/*
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ChibiOS - Copyright (C) 2006..2018 Giovanni Di Sirio
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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/**
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* @file hal_i2s.h
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* @brief I2S Driver macros and structures.
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*
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* @addtogroup I2S
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* @{
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*/
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#ifndef HAL_I2S_H
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#define HAL_I2S_H
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#if (HAL_USE_I2S == TRUE) || defined(__DOXYGEN__)
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/*===========================================================================*/
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/* Driver constants. */
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/*===========================================================================*/
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/**
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* @name I2S modes
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* @{
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*/
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#define I2S_MODE_SLAVE 0
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#define I2S_MODE_MASTER 1
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/** @} */
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/*===========================================================================*/
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/* Driver pre-compile time settings. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Derived constants and error checks. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver data structures and types. */
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/*===========================================================================*/
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/**
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* @brief Driver state machine possible states.
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*/
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typedef enum {
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I2S_UNINIT = 0, /**< Not initialized. */
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I2S_STOP = 1, /**< Stopped. */
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I2S_READY = 2, /**< Ready. */
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I2S_ACTIVE = 3, /**< Active. */
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I2S_COMPLETE = 4 /**< Transmission complete. */
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} i2sstate_t;
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/**
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* @brief Type of a structure representing an I2S driver.
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*/
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typedef struct hal_i2s_driver I2SDriver;
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/**
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* @brief Type of a structure representing an I2S driver configuration.
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*/
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typedef struct hal_i2s_config I2SConfig;
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/**
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* @brief I2S notification callback type.
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*
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* @param[in] i2sp pointer to the @p I2SDriver object
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*/
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typedef void (*i2scallback_t)(I2SDriver *i2sp);
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/* Including the low level driver header, it exports information required
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for completing types.*/
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#include "hal_i2s_lld.h"
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/**
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* @brief Structure representing an I2S driver.
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*/
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struct hal_i2s_driver {
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/**
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* @brief Driver state.
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*/
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i2sstate_t state;
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/**
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* @brief Current configuration data.
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*/
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const I2SConfig *config;
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/* End of the mandatory fields.*/
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i2s_lld_driver_fields;
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};
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/**
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* @brief Driver configuration structure.
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*/
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struct hal_i2s_config {
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/**
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* @brief Transmission buffer pointer.
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* @note Can be @p NULL if TX is not required.
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*/
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const void *tx_buffer;
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/**
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* @brief Receive buffer pointer.
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* @note Can be @p NULL if RX is not required.
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*/
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void *rx_buffer;
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/**
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* @brief TX and RX buffers size as number of samples.
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*/
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size_t size;
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/**
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* @brief Callback function called during streaming.
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*/
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i2scallback_t end_cb;
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/* End of the mandatory fields.*/
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i2s_lld_config_fields;
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};
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/*===========================================================================*/
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/* Driver macros. */
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/*===========================================================================*/
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/**
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* @name Macro Functions
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* @{
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*/
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/**
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* @brief Buffer state.
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* @note This function is meant to be called from the SPI callback only.
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*
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* @param[in] i2sp pointer to the @p I2SDriver object
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* @return The buffer state.
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* @retval false if the driver filled/sent the first half of the
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* buffer.
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* @retval true if the driver filled/sent the second half of the
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* buffer.
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*
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* @special
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*/
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#define i2sIsBufferComplete(i2sp) ((bool)((i2sp)->state == I2S_COMPLETE))
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/**
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* @brief Starts a I2S data exchange.
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*
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* @param[in] i2sp pointer to the @p I2SDriver object
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*
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* @iclass
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*/
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#define i2sStartExchangeI(i2sp) { \
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i2s_lld_start_exchange(i2sp); \
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(i2sp)->state = I2S_ACTIVE; \
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}
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/**
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* @brief Stops the ongoing data exchange.
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* @details The ongoing data exchange, if any, is stopped, if the driver
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* was not active the function does nothing.
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*
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* @param[in] i2sp pointer to the @p I2SDriver object
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*
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* @iclass
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*/
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#define i2sStopExchangeI(i2sp) { \
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i2s_lld_stop_exchange(i2sp); \
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(i2sp)->state = I2S_READY; \
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}
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/**
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* @brief Common ISR code, half buffer event.
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* @details This code handles the portable part of the ISR code:
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* - Callback invocation.
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* .
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* @note This macro is meant to be used in the low level drivers
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* implementation only.
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*
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* @param[in] i2sp pointer to the @p I2CDriver object
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*
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* @notapi
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*/
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#define _i2s_isr_half_code(i2sp) { \
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if ((i2sp)->config->end_cb != NULL) { \
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(i2sp)->config->end_cb(i2sp); \
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} \
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}
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/**
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* @brief Common ISR code.
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* @details This code handles the portable part of the ISR code:
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* - Callback invocation.
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* - Driver state transitions.
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* .
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* @note This macro is meant to be used in the low level drivers
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* implementation only.
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*
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* @param[in] i2sp pointer to the @p I2CDriver object
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*
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* @notapi
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*/
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#define _i2s_isr_full_code(i2sp) { \
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if ((i2sp)->config->end_cb) { \
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(i2sp)->state = I2S_COMPLETE; \
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(i2sp)->config->end_cb(i2sp); \
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if ((i2sp)->state == I2S_COMPLETE) { \
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(i2sp)->state = I2S_ACTIVE; \
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} \
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} \
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}
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/** @} */
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/*===========================================================================*/
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/* External declarations. */
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/*===========================================================================*/
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#ifdef __cplusplus
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extern "C" {
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#endif
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void i2sInit(void);
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void i2sObjectInit(I2SDriver *i2sp);
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void i2sStart(I2SDriver *i2sp, const I2SConfig *config);
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void i2sStop(I2SDriver *i2sp);
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void i2sStartExchange(I2SDriver *i2sp);
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void i2sStopExchange(I2SDriver *i2sp);
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#ifdef __cplusplus
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}
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#endif
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#endif /* HAL_USE_I2S == TRUE */
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#endif /* HAL_I2S_H */
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/** @} */
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