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/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
2011 Giovanni Di Sirio.
This file is part of ChibiOS/RT.
ChibiOS/RT is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
ChibiOS/RT is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file i2c.h
* @brief I2C Driver macros and structures.
*
* @addtogroup I2C
* @{
*/
#ifndef _I2C_H_
#define _I2C_H_
#if HAL_USE_I2C || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver constants. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver constants. */
/*===========================================================================*/
#define I2CD_NO_ERROR 0
/** @brief Bus Error.*/
#define I2CD_BUS_ERROR 0x01
/** @brief Arbitration Lost (master mode).*/
#define I2CD_ARBITRATION_LOST 0x02
/** @brief Acknowledge Failure.*/
#define I2CD_ACK_FAILURE 0x04
/** @brief Overrun/Underrun.*/
#define I2CD_OVERRUN 0x08
/** @brief PEC Error in reception.*/
#define I2CD_PEC_ERROR 0x10
/** @brief Timeout or Tlow Error.*/
#define I2CD_TIMEOUT 0x20
/** @brief SMBus Alert.*/
#define I2CD_SMB_ALERT 0x40
/*===========================================================================*/
/* Driver pre-compile time settings. */
/*===========================================================================*/
/**
* @brief Enables the mutual exclusion APIs on the I2C bus.
*/
#if !defined(I2C_USE_MUTUAL_EXCLUSION) || defined(__DOXYGEN__)
#define I2C_USE_MUTUAL_EXCLUSION TRUE
#endif
/*===========================================================================*/
/* Derived constants and error checks. */
/*===========================================================================*/
#if I2C_USE_MUTUAL_EXCLUSION && !CH_USE_MUTEXES && !CH_USE_SEMAPHORES
#error "I2C_USE_MUTUAL_EXCLUSION requires CH_USE_MUTEXES and/or CH_USE_SEMAPHORES"
#endif
/*===========================================================================*/
/* Driver data structures and types. */
/*===========================================================================*/
/**
* @brief Driver state machine possible states.
*/
typedef enum {
I2C_UNINIT = 0, /**< @brief Not initialized. */
I2C_STOP = 1, /**< @brief Stopped. */
I2C_READY = 2, /**< @brief Ready. */
I2C_ACTIVE = 3, /**< @brief In communication. */
I2C_COMPLETE = 4, /**< @brief Asynchronous operation complete. */
// slave part
I2C_SACTIVE = 10,
I2C_STRANSMIT = 11,
I2C_SRECEIVE = 12,
} i2cstate_t;
#include "i2c_lld.h"
/**
* @brief I2C notification callback type.
* @details This callback invoked when byte transfer finish event occurs,
* No matter sending or reading. This function designed
* for sending (re)start or stop events to I2C bus from user level.
*
* If callback function is set to NULL - driver atomaticcaly
* generate stop condition after the transfer finish.
*
* @param[in] i2cp pointer to the @p I2CDriver object triggering the
* callback
* @param[in] i2cscfg pointer to the @p I2CSlaveConfig object triggering the
* callback
*/
typedef void (*i2ccallback_t)(I2CDriver *i2cp, I2CSlaveConfig *i2cscfg);
/**
* @brief I2C error notification callback type.
*
* @param[in] i2cp pointer to the @p I2CDriver object triggering the
* callback
* @param[in] i2cscfg pointer to the @p I2CSlaveConfig object triggering the
* callback
*/
typedef void (*i2cerrorcallback_t)(I2CDriver *i2cp, I2CSlaveConfig *i2cscfg);
/**
* @brief I2C transmission data block size.
*/
typedef uint8_t i2cblock_t;
/**
* @brief Structure representing an I2C slave configuration.
* @details Each slave device has its own config structure with input and
* output buffers for temporally storing data.
*/
struct I2CSlaveConfig{
/**
* @brief Callback pointer.
* @note Transfer finished callback. Invoke when all data transferred, or
* by DMA buffer events
* If set to @p NULL then the callback is disabled.
*/
i2ccallback_t id_callback;
/**
* @brief Callback pointer.
* @note This callback will be invoked when error condition occur.
* If set to @p NULL then the callback is disabled.
*/
i2cerrorcallback_t id_err_callback;
size_t txbytes; /*!< Number of bytes to transmitted. */
size_t rxbytes; /*!< Number of bytes to received. */
i2cblock_t *rxbuf; /*!< Pointer to receive buffer. */
i2cblock_t *txbuf; /*!< Pointer to transmit buffer.*/
uint16_t slave_addr; /*!< Slave device address.*/
uint8_t nbit_addr; /*!< Length of address (must be 7 or 10).*/
i2cflags_t errors;
i2cflags_t flags;
/* Status Change @p EventSource.*/
EventSource sevent;
};
/*===========================================================================*/
/* Driver macros. */
/*===========================================================================*/
#if I2C_USE_WAIT || defined(__DOXYGEN__)
/**
* @brief Waits for operation completion.
* @details This function waits for the driver to complete the current
* operation.
* @pre An operation must be running while the function is invoked.
* @note No more than one thread can wait on a I2C driver using
* this function.
*
* @param[in] i2cp pointer to the @p I2CDriver object
*
* @notapi
*/
#define _i2c_wait_s(i2cp) { \
chDbgAssert((i2cp)->thread == NULL, \
"_i2c_wait(), #1", "already waiting"); \
(i2cp)->thread = chThdSelf(); \
chSchGoSleepS(THD_STATE_SUSPENDED); \
}
/**
* @brief Wakes up the waiting thread.
*
* @param[in] i2cp pointer to the @p I2CDriver object
*
* @notapi
*/
#define _i2c_wakeup_isr(i2cp) { \
if ((i2cp)->thread != NULL) { \
Thread *tp = (i2cp)->thread; \
(i2cp)->thread = NULL; \
chSysLockFromIsr(); \
chSchReadyI(tp); \
chSysUnlockFromIsr(); \
} \
}
#else /* !I2C_USE_WAIT */
#define _i2c_wait_s(i2cp)
#define _i2c_wakeup_isr(i2cp)
#endif /* !I2C_USE_WAIT */
/**
* @brief Common ISR code.
* @details This code handles the portable part of the ISR code:
* - Callback invocation.
* - Waiting thread wakeup, if any.
* - Driver state transitions.
* .
* @note This macro is meant to be used in the low level drivers
* implementation only.
*
* @param[in] i2cp pointer to the @p I2CDriver object
*
* @notapi
*/
#define _i2c_isr_code(i2cp, i2cscfg) { \
(i2cp)->id_state = I2C_COMPLETE; \
if(((i2cp)->id_slave_config)->id_callback) { \
((i2cp)->id_slave_config)->id_callback(i2cp, i2cscfg); \
} \
_i2c_wakeup_isr(i2cp); \
}
/*===========================================================================*/
/* External declarations. */
/*===========================================================================*/
#ifdef __cplusplus
extern "C" {
#endif
void i2cInit(void);
void i2cObjectInit(I2CDriver *i2cp);
void i2cStart(I2CDriver *i2cp, I2CConfig *config);
void i2cStop(I2CDriver *i2cp);
void i2cMasterTransmit(I2CDriver *i2cp, I2CSlaveConfig *i2cscfg);
void i2cMasterReceive(I2CDriver *i2cp, I2CSlaveConfig *i2cscfg);
void i2cMasterStart(I2CDriver *i2cp);
void i2cMasterStop(I2CDriver *i2cp);
void i2cAddFlagsI(I2CDriver *i2cp, i2cflags_t mask);
#if I2C_USE_MUTUAL_EXCLUSION
void i2cAcquireBus(I2CDriver *i2cp);
void i2cReleaseBus(I2CDriver *i2cp);
#endif /* I2C_USE_MUTUAL_EXCLUSION */
#ifdef __cplusplus
}
#endif
#endif /* HAL_USE_I2C */
#endif /* _I2C_H_ */
/** @} */
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