145 lines
5.5 KiB
C
145 lines
5.5 KiB
C
/*
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ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
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2011,2012,2013 Giovanni Di Sirio.
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This file is part of ChibiOS/RT.
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ChibiOS/RT is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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ChibiOS/RT is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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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 i2c.h
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* @brief I2C Driver macros and structures.
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*
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* @addtogroup I2C
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* @{
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*/
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#ifndef _I2C_H_
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#define _I2C_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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* @name I2C bus error conditions
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* @{
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*/
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#define I2CD_NO_ERROR 0x00 /**< @brief No error. */
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#define I2CD_BUS_ERROR 0x01 /**< @brief Bus Error. */
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#define I2CD_ARBITRATION_LOST 0x02 /**< @brief Arbitration Lost. */
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#define I2CD_ACK_FAILURE 0x04 /**< @brief Acknowledge Failure. */
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#define I2CD_OVERRUN 0x08 /**< @brief Overrun/Underrun. */
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#define I2CD_TIMEOUT 0x10 /**< @brief Hardware timeout. */
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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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* @brief Enables the mutual exclusion APIs on the I2C bus.
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*/
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#if !defined(I2C_USE_MUTUAL_EXCLUSION) || defined(__DOXYGEN__)
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#define I2C_USE_MUTUAL_EXCLUSION TRUE
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#endif
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/*===========================================================================*/
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/* Derived constants and error checks. */
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/*===========================================================================*/
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#if I2C_USE_MUTUAL_EXCLUSION && !CH_USE_MUTEXES && !CH_USE_SEMAPHORES
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#error "I2C_USE_MUTUAL_EXCLUSION requires CH_USE_MUTEXES and/or CH_USE_SEMAPHORES"
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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 Driver state machine possible states.
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*/
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typedef enum {
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I2C_UNINIT = 0, /**< Not initialized. */
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I2C_STOP = 1, /**< Stopped. */
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I2C_READY = 2, /**< Ready. */
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I2C_ACTIVE_TX = 3, /**< Transmitting. */
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I2C_ACTIVE_RX = 4, /**< Receiving. */
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I2C_LOCKED = 5 /**> Bus or driver locked. */
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} i2cstate_t;
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#include "i2c_lld.h"
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/*===========================================================================*/
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/* Driver macros. */
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/*===========================================================================*/
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/**
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* @brief Wrap i2cMasterTransmitTimeout function with TIME_INFINITE timeout.
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* @api
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*/
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#define i2cMasterTransmit(i2cp, addr, txbuf, txbytes, rxbuf, rxbytes) \
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(i2cMasterTransmitTimeout(i2cp, addr, txbuf, txbytes, rxbuf, rxbytes, \
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TIME_INFINITE))
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/**
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* @brief Wrap i2cMasterReceiveTimeout function with TIME_INFINITE timeout.
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* @api
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*/
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#define i2cMasterReceive(i2cp, addr, rxbuf, rxbytes) \
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(i2cMasterReceiveTimeout(i2cp, addr, rxbuf, rxbytes, TIME_INFINITE))
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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 i2cInit(void);
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void i2cObjectInit(I2CDriver *i2cp);
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void i2cStart(I2CDriver *i2cp, const I2CConfig *config);
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void i2cStop(I2CDriver *i2cp);
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i2cflags_t i2cGetErrors(I2CDriver *i2cp);
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msg_t i2cMasterTransmitTimeout(I2CDriver *i2cp,
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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 i2cMasterReceiveTimeout(I2CDriver *i2cp,
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i2caddr_t addr,
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uint8_t *rxbuf, size_t rxbytes,
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systime_t timeout);
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#if I2C_USE_MUTUAL_EXCLUSION
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void i2cAcquireBus(I2CDriver *i2cp);
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void i2cReleaseBus(I2CDriver *i2cp);
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#endif /* I2C_USE_MUTUAL_EXCLUSION */
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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_H_ */
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/** @} */
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