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/*
ChibiOS/RT - Copyright (C) 2006-2013 Giovanni Di Sirio
LPC122x I2C driver - Copyright (C) 2013 Marcin Jokel
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
/*
Concepts and parts of this file have been contributed by Uladzimir Pylinsky
aka barthess.
*/
/**
* @file LPC122x/i2c_lld.h
* @brief LPC122x I2C subsystem low level driver header.
*
* @addtogroup I2C
* @{
*/
#ifndef _I2C_LLD_H_
#define _I2C_LLD_H_
#if HAL_USE_I2C || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver constants. */
/*===========================================================================*/
#define I2C_CONSET_AA 0x04 /* Assert acknowledge flag. */
#define I2C_CONSET_SI 0x08 /* I2C interrupt flag. */
#define I2C_CONSET_STO 0x10 /* STOP flag. */
#define I2C_CONSET_STA 0x20 /* START flag. */
#define I2C_CONSET_EN 0x40 /* I2C interface enable. */
#define I2C_CONCLR_AAC 0x04 /* Assert acknowledge Clear bit. */
#define I2C_CONCLR_SIC 0x08 /* I2C interrupt Clear bit. */
#define I2C_CONCLR_STAC 0x20 /* START flag Clear bit. */
#define I2C_CONCLR_ENC 0x40 /* I2C interface Disable bit. */
#define I2C_WR_BIT 0x00
#define I2C_RD_BIT 0x01
#define I2C_STATE_MS_START 0x08
#define I2C_STATE_MS_RSTART 0x10
#define I2C_STATE_MS_SLAW_ACK 0x18
#define I2C_STATE_MS_SLAW_NACK 0x20
#define I2C_STATE_MS_TDAT_ACK 0x28
#define I2C_STATE_MS_TDAT_NACK 0x30
#define I2C_STATE_ARB_LOST 0x38
#define I2C_STATE_MS_SLAR_ACK 0x40
#define I2C_STATE_MS_SLAR_NACK 0x48
#define I2C_STATE_MS_RDAT_ACK 0x50
#define I2C_STATE_MS_RDAT_NACK 0x58
#define I2C_STATE_BUS_ERROR 0x00
/*===========================================================================*/
/* Driver pre-compile time settings. */
/*===========================================================================*/
/**
* @name Configuration options
* @{
*/
/**
* @brief I2C interrupt priority level setting.
*/
#if !defined(LPC122x_I2C_IRQ_PRIORITY) || defined(__DOXYGEN__)
#define LPC122x_I2C_IRQ_PRIORITY 3
#endif
/** @} */
/*===========================================================================*/
/* Derived constants and error checks. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver data structures and types. */
/*===========================================================================*/
/**
* @brief Type representing I2C address.
*/
typedef uint16_t i2caddr_t;
/**
* @brief I2C Driver condition flags type.
*/
typedef uint32_t i2cflags_t;
/**
* @brief Supported modes for the I2C bus.
*/
typedef enum {
I2C_STANDARD_MODE = 1,
I2C_FAST_MODE = 2,
I2C_FAST_MODE_PLUS = 3
} i2cmode_t;
/**
* @brief Driver configuration structure.
*/
typedef struct {
i2cmode_t mode; /**< @brief Specifies the I2C mode. */
uint32_t clock_timing; /**< @brief Specifies the clock timing */
} I2CConfig;
/**
* @brief Type of a structure representing an I2C driver.
*/
typedef struct I2CDriver I2CDriver;
/**
* @brief Structure representing an I2C driver.
*/
struct I2CDriver {
/**
* @brief Driver state.
*/
i2cstate_t state;
/**
* @brief Current configuration data.
*/
const I2CConfig *config;
/**
* @brief Error flags.
*/
i2cflags_t errors;
#if I2C_USE_MUTUAL_EXCLUSION || defined(__DOXYGEN__)
#if CH_USE_MUTEXES || defined(__DOXYGEN__)
/**
* @brief Mutex protecting the bus.
*/
Mutex mutex;
#elif CH_USE_SEMAPHORES
Semaphore semaphore;
#endif
#endif /* I2C_USE_MUTUAL_EXCLUSION */
#if defined(I2C_DRIVER_EXT_FIELDS)
I2C_DRIVER_EXT_FIELDS
#endif
/* End of the mandatory fields.*/
/**
* @brief Thread waiting for I/O completion.
*/
Thread *thread;
/**
* @brief Current slave address without R/W bit.
*/
i2caddr_t addr;
/**
* @brief Pointer to the transmit buffer.
*/
const uint8_t *txbuf;
/**
* @brief Number of bytes to transmit.
*/
size_t txbytes;
/**
* @brief Pointer to the receive buffer.
*/
uint8_t *rxbuf;
/**
* @brief Number of bytes to receive.
*/
size_t rxbytes;
/**
* @brief Pointer to the I2C registers block.
*/
LPC_I2C_Type *i2c;
};
/*===========================================================================*/
/* Driver macros. */
/*===========================================================================*/
/**
* @brief Get errors from I2C driver.
*
* @param[in] i2cp pointer to the @p I2CDriver object
*
* @notapi
*/
#define i2c_lld_get_errors(i2cp) ((i2cp)->errors)
/*===========================================================================*/
/* External declarations. */
/*===========================================================================*/
#if !defined(__DOXYGEN__)
extern I2CDriver I2CD1;
#endif
#endif /* !defined(__DOXYGEN__) */
#ifdef __cplusplus
extern "C" {
#endif
void i2c_lld_init(void);
void i2c_lld_start(I2CDriver *i2cp);
void i2c_lld_stop(I2CDriver *i2cp);
msg_t i2c_lld_master_transmit_timeout(I2CDriver *i2cp, i2caddr_t addr,
const uint8_t *txbuf, size_t txbytes,
uint8_t *rxbuf, size_t rxbytes,
systime_t timeout);
msg_t i2c_lld_master_receive_timeout(I2CDriver *i2cp, i2caddr_t addr,
uint8_t *rxbuf, size_t rxbytes,
systime_t timeout);
#ifdef __cplusplus
}
#endif
#endif /* _I2C_LLD_H_ */
/** @} */
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