186 lines
7.0 KiB
C
186 lines
7.0 KiB
C
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/*
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ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010 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 i2c.h
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* @brief I2C Driver macros and structures.
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*
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* @addtogroup I2C
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* @{
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*/
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#ifndef I2C_H_
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#define I2C_H_
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#include "ch.h"
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#include "hal.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 I2CD_NO_ERROR 0
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/** @brief Bus Error.*/
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#define I2CD_BUS_ERROR 0x01
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/** @brief Arbitration Lost (master mode).*/
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#define I2CD_ARBITRATION_LOST 0x02
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/** @brief Acknowledge Failure.*/
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#define I2CD_ACK_FAILURE 0x04
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/** @brief Overrun/Underrun.*/
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#define I2CD_OVERRUN 0x08
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/** @brief PEC Error in reception.*/
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#define I2CD_PEC_ERROR 0x10
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/** @brief Timeout or Tlow Error.*/
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#define I2CD_TIMEOUT 0x20
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/** @brief SMBus Alert.*/
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#define I2CD_SMB_ALERT 0x40
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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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* @brief Enables synchronous APIs.
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* @note Disabling this option saves both code and data space.
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*/
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#if !defined(I2C_USE_WAIT) || defined(__DOXYGEN__)
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#define I2C_USE_WAIT TRUE
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#endif
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/**
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* @brief Enables the mutual exclusion APIs on the I2C bus.
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*/
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#if !defined(I2C_USE_MUTUAL_EXCLUSION) || defined(__DOXYGEN__)
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#define I2C_USE_MUTUAL_EXCLUSION 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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#if I2C_USE_MUTUAL_EXCLUSION && !CH_USE_MUTEXES && !CH_USE_SEMAPHORES
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#error "I2C_USE_MUTUAL_EXCLUSION requires CH_USE_MUTEXES and/or CH_USE_SEMAPHORES"
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#endif
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/**
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* @brief Driver state machine possible states.
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*/
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typedef enum {
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I2C_UNINIT = 0, /**< @brief Not initialized. */
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I2C_STOP = 1, /**< @brief Stopped. */
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I2C_READY = 2, /**< @brief Ready. */
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I2C_ACTIVE = 3, /**< @brief In communication. */
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I2C_COMPLETE = 4 /**< @brief Asynchronous operation complete. */
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} i2cstate_t;
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#include "i2c_lld.h"
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#if I2C_USE_WAIT || defined(__DOXYGEN__)
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/**
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* @brief Waits for operation completion.
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* @details This function waits for the driver to complete the current
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* operation.
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* @pre An operation must be running while the function is invoked.
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* @note No more than one thread can wait on a I2C driver using
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* this function.
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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_wait_s(i2cp) { \
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chDbgAssert((i2cp)->thread == NULL, \
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"_i2c_wait(), #1", "already waiting"); \
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(i2cp)->thread = chThdSelf(); \
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chSchGoSleepS(THD_STATE_SUSPENDED); \
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}
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/**
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* @brief Wakes up the waiting thread.
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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_wakeup_isr(i2cp) { \
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if ((i2cp)->thread != NULL) { \
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Thread *tp = (i2cp)->thread; \
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(i2cp)->thread = NULL; \
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chSysLockFromIsr(); \
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chSchReadyI(tp); \
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chSysUnlockFromIsr(); \
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} \
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}
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#else /* !I2C_USE_WAIT */
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#define _i2c_wait_s(i2cp)
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#define _i2c_wakeup_isr(i2cp)
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#endif /* !I2C_USE_WAIT */
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/**
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* @brief Common ISR code.
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* @details This code handles the portable part of the ISR code:
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* - Callback invocation.
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* - Waiting thread wakeup, if any.
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* - Driver state transitions.
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* .
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* @note This macro is meant to be used in the low level drivers
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* implementation only.
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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_isr_code(i2cp) { \
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(i2cp)->state = I2C_COMPLETE; \
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if((i2cp)->endcb) { \
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(i2cp)->endcb(i2cp); \
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} \
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_i2c_wakeup_isr(i2cp); \
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}
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/*===========================================================================*/
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/* External declarations. */
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/*===========================================================================*/
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#ifdef __cplusplus
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extern "C" {
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#endif
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void i2cInit(void);
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void i2cObjectInit(I2CDriver *i2cp);
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void i2cStart(I2CDriver *i2cp, const I2CConfig *config);
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void i2cStop(I2CDriver *i2cp);
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void i2cMasterTransmit(I2CDriver *i2cp, uint16_t slave_addr, size_t n, void *txbuf);
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void i2cMasterReceive(I2CDriver *i2cp, uint16_t slave_addr, size_t n, void *rxbuf);
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void i2cAddFlagsI(I2CDriver *i2cp, i2cflags_t mask);
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i2cflags_t i2cGetAndClearFlags(I2CDriver *i2cp);
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uint16_t i2cSMBusAlertResponse(I2CDriver *i2cp);
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#if I2C_USE_MUTUAL_EXCLUSION
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void i2cAcquireBus(I2CDriver *i2cp);
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void i2cReleaseBus(I2CDriver *i2cp);
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#endif /* I2C_USE_MUTUAL_EXCLUSION */
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#ifdef __cplusplus
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}
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#endif
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#endif /* CH_HAL_USE_I2C */
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#endif /* I2C_H_ */
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