228 lines
6.8 KiB
C
228 lines
6.8 KiB
C
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/*
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ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
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2011,2012 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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* @file AVR/i2c_lld.h
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* @brief AVR 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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/** START transmitted */
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#define TWI_START 0x08
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/** Repeated START transmitted */
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#define TWI_REPEAT_START 0x10
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/** Arbitration Lost */
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#define TWI_ARBITRATION_LOST 0x38
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/** Bus errors */
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#define TWI_BUS_ERROR 0x00
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/** SLA+W transmitted with ACK response */
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#define TWI_MASTER_TX_ADDR_ACK 0x18
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/** SLA+W transmitted with NACK response */
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#define TWI_MASTER_TX_ADDR_NACK 0x20
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/** DATA transmitted with ACK response */
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#define TWI_MASTER_TX_DATA_ACK 0x28
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/** DATA transmitted with NACK response */
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#define TWI_MASTER_TX_DATA_NACK 0x30
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/** SLA+R transmitted with ACK response */
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#define TWI_MASTER_RX_ADDR_ACK 0x40
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/** SLA+R transmitted with NACK response */
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#define TWI_MASTER_RX_ADDR_NACK 0x48
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/** DATA received with ACK response */
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#define TWI_MASTER_RX_DATA_ACK 0x50
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/** DATA received with NACK response */
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#define TWI_MASTER_RX_DATA_NACK 0x58
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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 I2C driver enable switch.
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* @details If set to @p TRUE the support for I2C is included.
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* @note The default is @p FALSE.
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*/
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#if !defined(USE_AVR_I2C) || defined(__DOXYGEN__)
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#define USE_AVR_I2C FALSE
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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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/*===========================================================================*/
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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 uint8_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 uint8_t i2cflags_t;
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/**
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* @brief Driver configuration structure.
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* @note Implementations may extend this structure to contain more,
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* architecture dependent, fields.
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*/
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typedef struct {
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/**
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* @brief Specifies the I2C clock frequency.
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*/
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uint32_t clock_speed;
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} I2CConfig;
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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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#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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* @brief Address of slave device
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*/
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i2caddr_t addr;
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/**
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* @brief Pointer to the buffer with data to send.
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*/
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const uint8_t *txbuf;
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/**
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* @brief Number of bytes of data to send.
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*/
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size_t txbytes;
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/**
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* @brief Current index in buffer when sending data.
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*/
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size_t txidx;
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/**
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* @brief Pointer to the buffer to put received data.
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*/
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uint8_t *rxbuf;
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/**
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* @brief Number of bytes of data to receive.
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*/
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size_t rxbytes;
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/**
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* @brief Current index in buffer when receiving data.
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*/
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size_t rxidx;
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};
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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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/* 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 USE_AVR_I2C
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extern I2CDriver I2CD;
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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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