221 lines
6.6 KiB
C
221 lines
6.6 KiB
C
/*
|
|
ChibiOS - Copyright (C) 2006..2016 Giovanni Di Sirio
|
|
|
|
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.
|
|
*/
|
|
|
|
/**
|
|
* @file AVR/i2c_lld.h
|
|
* @brief AVR I2C subsystem low level driver header.
|
|
*
|
|
* @addtogroup I2C
|
|
* @{
|
|
*/
|
|
|
|
#ifndef _I2C_LLD_H_
|
|
#define _I2C_LLD_H_
|
|
|
|
#if HAL_USE_I2C || defined(__DOXYGEN__)
|
|
|
|
/*===========================================================================*/
|
|
/* Driver constants. */
|
|
/*===========================================================================*/
|
|
|
|
/** @brief START transmitted.*/
|
|
#define TWI_START 0x08
|
|
/** @brief Repeated START transmitted.*/
|
|
#define TWI_REPEAT_START 0x10
|
|
/** @brief Arbitration Lost.*/
|
|
#define TWI_ARBITRATION_LOST 0x38
|
|
/** @brief Bus errors.*/
|
|
#define TWI_BUS_ERROR 0x00
|
|
|
|
/** @brief SLA+W transmitted with ACK response.*/
|
|
#define TWI_MASTER_TX_ADDR_ACK 0x18
|
|
/** @brief SLA+W transmitted with NACK response.*/
|
|
#define TWI_MASTER_TX_ADDR_NACK 0x20
|
|
/** @brief DATA transmitted with ACK response.*/
|
|
#define TWI_MASTER_TX_DATA_ACK 0x28
|
|
/** @brief DATA transmitted with NACK response.*/
|
|
#define TWI_MASTER_TX_DATA_NACK 0x30
|
|
|
|
/** @brief SLA+R transmitted with ACK response.*/
|
|
#define TWI_MASTER_RX_ADDR_ACK 0x40
|
|
/** @brief SLA+R transmitted with NACK response.*/
|
|
#define TWI_MASTER_RX_ADDR_NACK 0x48
|
|
/** @brief DATA received with ACK response.*/
|
|
#define TWI_MASTER_RX_DATA_ACK 0x50
|
|
/** @brief DATA received with NACK response.*/
|
|
#define TWI_MASTER_RX_DATA_NACK 0x58
|
|
|
|
/*===========================================================================*/
|
|
/* Driver pre-compile time settings. */
|
|
/*===========================================================================*/
|
|
|
|
/**
|
|
* @name Configuration options
|
|
* @{
|
|
*/
|
|
/**
|
|
* @brief I2C driver enable switch.
|
|
* @details If set to @p TRUE the support for I2C is included.
|
|
* @note The default is @p FALSE.
|
|
*/
|
|
#if !defined(AVR_I2C_USE_I2C1) || defined(__DOXYGEN__)
|
|
#define AVR_I2C_USE_I2C1 FALSE
|
|
#endif
|
|
/** @} */
|
|
|
|
/*===========================================================================*/
|
|
/* Derived constants and error checks. */
|
|
/*===========================================================================*/
|
|
|
|
/*===========================================================================*/
|
|
/* Driver data structures and types. */
|
|
/*===========================================================================*/
|
|
|
|
/**
|
|
* @brief Type representing I2C address.
|
|
*/
|
|
typedef uint8_t i2caddr_t;
|
|
|
|
/**
|
|
* @brief I2C Driver condition flags type.
|
|
*/
|
|
typedef uint8_t i2cflags_t;
|
|
|
|
/**
|
|
* @brief Driver configuration structure.
|
|
* @note Implementations may extend this structure to contain more,
|
|
* architecture dependent, fields.
|
|
*/
|
|
typedef struct {
|
|
|
|
/**
|
|
* @brief Specifies the I2C clock frequency.
|
|
*/
|
|
uint32_t clock_speed;
|
|
|
|
} I2CConfig;
|
|
|
|
/**
|
|
* @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__)
|
|
/**
|
|
* @brief Mutex protecting the bus.
|
|
*/
|
|
mutex_t mutex;
|
|
#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_reference_t thread;
|
|
/**
|
|
* @brief Address of slave device.
|
|
*/
|
|
i2caddr_t addr;
|
|
/**
|
|
* @brief Pointer to the buffer with data to send.
|
|
*/
|
|
const uint8_t *txbuf;
|
|
/**
|
|
* @brief Number of bytes of data to send.
|
|
*/
|
|
size_t txbytes;
|
|
/**
|
|
* @brief Current index in buffer when sending data.
|
|
*/
|
|
size_t txidx;
|
|
/**
|
|
* @brief Pointer to the buffer to put received data.
|
|
*/
|
|
uint8_t *rxbuf;
|
|
/**
|
|
* @brief Number of bytes of data to receive.
|
|
*/
|
|
size_t rxbytes;
|
|
/**
|
|
* @brief Current index in buffer when receiving data.
|
|
*/
|
|
size_t rxidx;
|
|
};
|
|
|
|
/**
|
|
* @brief Type of a structure representing an I2C driver.
|
|
*/
|
|
typedef struct I2CDriver I2CDriver;
|
|
|
|
/*===========================================================================*/
|
|
/* 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__)
|
|
#if AVR_I2C_USE_I2C1
|
|
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 /* HAL_USE_I2C */
|
|
|
|
#endif /* _I2C_LLD_H_ */
|
|
|
|
/** @} */
|