mirror of https://github.com/rusefi/ChibiOS.git
205 lines
5.8 KiB
C
205 lines
5.8 KiB
C
/*
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ChibiOS/RT - Copyright (C) 2006-2013 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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Concepts and parts of this file have been contributed by Uladzimir Pylinsky
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aka barthess.
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*/
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/**
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* @file AT91SAM7/i2c_lld.h
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* @brief AT91SAM7 I2C subsystem low level driver header.
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*
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* @addtogroup I2C
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* @{
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*/
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#ifndef _I2C_LLD_H_
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#define _I2C_LLD_H_
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#if HAL_USE_I2C || defined(__DOXYGEN__)
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/*===========================================================================*/
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/* Driver constants. */
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/*===========================================================================*/
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/**
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* @brief Peripheral clock frequency.
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*/
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#define I2C_CLK_FREQ ((STM32_PCLK1) / 1000000)
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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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* @name Configuration options
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* @{
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*/
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/**
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* @brief I2C1 driver enable switch.
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* @details If set to @p TRUE the support for I2C1 is included.
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* @note The default is @p FALSE.
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*/
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#if !defined(SAM7_I2C_USE_I2C1) || defined(__DOXYGEN__)
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#define SAM7_I2C_USE_I2C1 FALSE
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#endif
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/**
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* @brief I2C1 interrupt priority level setting.
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*/
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#if !defined(SAM7_I2C_I2C1_IRQ_PRIORITY) || defined(__DOXYGEN__)
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#define SAM7_I2C_I2C1_IRQ_PRIORITY (AT91C_AIC_PRIOR_HIGHEST - 2)
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#endif
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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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/** @brief error checks */
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#if !SAM7_I2C_USE_I2C1
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#error "I2C driver activated but no I2C peripheral assigned"
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#endif
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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 Type representing I2C address.
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*/
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typedef uint16_t i2caddr_t;
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/**
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* @brief I2C Driver condition flags type.
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*/
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typedef uint32_t i2cflags_t;
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/**
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* @brief Driver configuration structure.
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*/
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typedef struct {
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/**
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* @brief CWGR regitster content.
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*/
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uint32_t cwgr;
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} I2CConfig;
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/**
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* @brief Type of a structure representing an I2C driver.
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*/
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typedef struct I2CDriver I2CDriver;
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/**
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* @brief Structure representing an I2C driver.
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*/
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struct I2CDriver{
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/**
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* @brief Driver state.
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*/
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i2cstate_t state;
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/**
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* @brief Current configuration data.
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*/
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const I2CConfig *config;
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/**
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* @brief Error flags.
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*/
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i2cflags_t errors;
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/**
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* @brief Pointer to receive buffer.
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*/
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uint8_t *rxbuf;
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/**
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* @brief Pointer to transmit buffer.
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*/
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const uint8_t *txbuf;
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/**
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* @brief Bytes count to be received.
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*/
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size_t rxbytes;
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/**
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* @brief Bytes count to be transmitted.
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*/
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size_t txbytes;
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#if I2C_USE_MUTUAL_EXCLUSION || defined(__DOXYGEN__)
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#if CH_USE_MUTEXES || defined(__DOXYGEN__)
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/**
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* @brief Mutex protecting the bus.
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*/
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Mutex mutex;
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#elif CH_USE_SEMAPHORES
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Semaphore semaphore;
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#endif
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#endif /* I2C_USE_MUTUAL_EXCLUSION */
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#if defined(I2C_DRIVER_EXT_FIELDS)
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I2C_DRIVER_EXT_FIELDS
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#endif
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/* End of the mandatory fields.*/
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/**
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* @brief Thread waiting for I/O completion.
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*/
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Thread *thread;
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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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* @brief Get errors from I2C driver.
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*
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* @param[in] i2cp pointer to the @p I2CDriver object
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*
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* @notapi
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*/
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#define i2c_lld_get_errors(i2cp) ((i2cp)->errors)
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/*===========================================================================*/
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/* External declarations. */
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/*===========================================================================*/
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#if !defined(__DOXYGEN__)
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#if SAM7_I2C_USE_I2C1
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extern I2CDriver I2CD1;
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#endif
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#endif /* !defined(__DOXYGEN__) */
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#ifdef __cplusplus
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extern "C" {
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#endif
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void i2c_lld_init(void);
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void i2c_lld_start(I2CDriver *i2cp);
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void i2c_lld_stop(I2CDriver *i2cp);
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msg_t i2c_lld_master_transmit_timeout(I2CDriver *i2cp, i2caddr_t addr,
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const uint8_t *txbuf, size_t txbytes,
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uint8_t *rxbuf, size_t rxbytes,
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systime_t timeout);
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msg_t i2c_lld_master_receive_timeout(I2CDriver *i2cp, i2caddr_t addr,
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uint8_t *rxbuf, size_t rxbytes,
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systime_t timeout);
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#ifdef __cplusplus
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}
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#endif
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#endif /* HAL_USE_I2C */
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#endif /* _I2C_LLD_H_ */
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/** @} */
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