229 lines
7.0 KiB
C
229 lines
7.0 KiB
C
/*
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ChibiOS/RT - Copyright (C) 2006-2013 Giovanni Di Sirio
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LPC122x I2C driver - Copyright (C) 2013 Marcin Jokel
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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 LPC122x/i2c_lld.h
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* @brief LPC122x 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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#define I2C_CONSET_AA 0x04 /* Assert acknowledge flag. */
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#define I2C_CONSET_SI 0x08 /* I2C interrupt flag. */
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#define I2C_CONSET_STO 0x10 /* STOP flag. */
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#define I2C_CONSET_STA 0x20 /* START flag. */
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#define I2C_CONSET_EN 0x40 /* I2C interface enable. */
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#define I2C_CONCLR_AAC 0x04 /* Assert acknowledge Clear bit. */
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#define I2C_CONCLR_SIC 0x08 /* I2C interrupt Clear bit. */
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#define I2C_CONCLR_STAC 0x20 /* START flag Clear bit. */
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#define I2C_CONCLR_ENC 0x40 /* I2C interface Disable bit. */
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#define I2C_WR_BIT 0x00
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#define I2C_RD_BIT 0x01
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#define I2C_STATE_MS_START 0x08
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#define I2C_STATE_MS_RSTART 0x10
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#define I2C_STATE_MS_SLAW_ACK 0x18
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#define I2C_STATE_MS_SLAW_NACK 0x20
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#define I2C_STATE_MS_TDAT_ACK 0x28
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#define I2C_STATE_MS_TDAT_NACK 0x30
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#define I2C_STATE_ARB_LOST 0x38
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#define I2C_STATE_MS_SLAR_ACK 0x40
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#define I2C_STATE_MS_SLAR_NACK 0x48
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#define I2C_STATE_MS_RDAT_ACK 0x50
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#define I2C_STATE_MS_RDAT_NACK 0x58
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#define I2C_STATE_BUS_ERROR 0x00
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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 interrupt priority level setting.
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*/
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#if !defined(LPC122x_I2C_IRQ_PRIORITY) || defined(__DOXYGEN__)
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#define LPC122x_I2C_IRQ_PRIORITY 3
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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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/*===========================================================================*/
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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 Supported modes for the I2C bus.
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*/
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typedef enum {
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I2C_STANDARD_MODE = 1,
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I2C_FAST_MODE = 2,
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I2C_FAST_MODE_PLUS = 3
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} i2cmode_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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i2cmode_t mode; /**< @brief Specifies the I2C mode. */
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uint32_t clock_timing; /**< @brief Specifies the clock timing */
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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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#if I2C_USE_MUTUAL_EXCLUSION || defined(__DOXYGEN__)
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#if CH_CFG_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_CFG_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 Current slave address without R/W bit.
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*/
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i2caddr_t addr;
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/**
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* @brief Pointer to the transmit buffer.
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*/
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const uint8_t *txbuf;
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/**
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* @brief Number of bytes to transmit.
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*/
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size_t txbytes;
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/**
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* @brief Pointer to the receive buffer.
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*/
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uint8_t *rxbuf;
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/**
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* @brief Number of bytes to receive.
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*/
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size_t rxbytes;
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/**
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* @brief Pointer to the I2C registers block.
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*/
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LPC_I2C_Type *i2c;
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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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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 /* _I2C_LLD_H_ */
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/** @} */
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