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-rw-r--r--os/hal/src/i2c.c303
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diff --git a/os/hal/src/i2c.c b/os/hal/src/i2c.c
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--- a/os/hal/src/i2c.c
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-/*
- ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
- 2011,2012,2013 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/>.
-*/
-/*
- Concepts and parts of this file have been contributed by Uladzimir Pylinsky
- aka barthess.
- */
-
-/**
- * @file i2c.c
- * @brief I2C Driver code.
- *
- * @addtogroup I2C
- * @{
- */
-#include "ch.h"
-#include "hal.h"
-
-#if HAL_USE_I2C || defined(__DOXYGEN__)
-
-/*===========================================================================*/
-/* Driver local definitions. */
-/*===========================================================================*/
-
-/*===========================================================================*/
-/* Driver exported variables. */
-/*===========================================================================*/
-
-/*===========================================================================*/
-/* Driver local variables and types. */
-/*===========================================================================*/
-
-/*===========================================================================*/
-/* Driver local functions. */
-/*===========================================================================*/
-
-/*===========================================================================*/
-/* Driver exported functions. */
-/*===========================================================================*/
-
-/**
- * @brief I2C Driver initialization.
- * @note This function is implicitly invoked by @p halInit(), there is
- * no need to explicitly initialize the driver.
- *
- * @init
- */
-void i2cInit(void) {
- i2c_lld_init();
-}
-
-/**
- * @brief Initializes the standard part of a @p I2CDriver structure.
- *
- * @param[out] i2cp pointer to the @p I2CDriver object
- *
- * @init
- */
-void i2cObjectInit(I2CDriver *i2cp) {
-
- i2cp->state = I2C_STOP;
- i2cp->config = NULL;
-
-#if I2C_USE_MUTUAL_EXCLUSION
-#if CH_CFG_USE_MUTEXES
- chMtxInit(&i2cp->mutex);
-#else
- chSemInit(&i2cp->semaphore, 1);
-#endif /* CH_CFG_USE_MUTEXES */
-#endif /* I2C_USE_MUTUAL_EXCLUSION */
-
-#if defined(I2C_DRIVER_EXT_INIT_HOOK)
- I2C_DRIVER_EXT_INIT_HOOK(i2cp);
-#endif
-}
-
-/**
- * @brief Configures and activates the I2C peripheral.
- *
- * @param[in] i2cp pointer to the @p I2CDriver object
- * @param[in] config pointer to the @p I2CConfig object
- *
- * @api
- */
-void i2cStart(I2CDriver *i2cp, const I2CConfig *config) {
-
- chDbgCheck((i2cp != NULL) && (config != NULL), "i2cStart");
- chDbgAssert((i2cp->state == I2C_STOP) || (i2cp->state == I2C_READY) ||
- (i2cp->state == I2C_LOCKED),
- "i2cStart(), #1",
- "invalid state");
-
- chSysLock();
- i2cp->config = config;
- i2c_lld_start(i2cp);
- i2cp->state = I2C_READY;
- chSysUnlock();
-}
-
-/**
- * @brief Deactivates the I2C peripheral.
- *
- * @param[in] i2cp pointer to the @p I2CDriver object
- *
- * @api
- */
-void i2cStop(I2CDriver *i2cp) {
-
- chDbgCheck(i2cp != NULL, "i2cStop");
- chDbgAssert((i2cp->state == I2C_STOP) || (i2cp->state == I2C_READY) ||
- (i2cp->state == I2C_LOCKED),
- "i2cStop(), #1",
- "invalid state");
-
- chSysLock();
- i2c_lld_stop(i2cp);
- i2cp->state = I2C_STOP;
- chSysUnlock();
-}
-
-/**
- * @brief Returns the errors mask associated to the previous operation.
- *
- * @param[in] i2cp pointer to the @p I2CDriver object
- * @return The errors mask.
- *
- * @api
- */
-i2cflags_t i2cGetErrors(I2CDriver *i2cp) {
-
- chDbgCheck(i2cp != NULL, "i2cGetErrors");
-
- return i2c_lld_get_errors(i2cp);
-}
-
-/**
- * @brief Sends data via the I2C bus.
- * @details Function designed to realize "read-through-write" transfer
- * paradigm. If you want transmit data without any further read,
- * than set @b rxbytes field to 0.
- *
- * @param[in] i2cp pointer to the @p I2CDriver object
- * @param[in] addr slave device address (7 bits) without R/W bit
- * @param[in] txbuf pointer to transmit buffer
- * @param[in] txbytes number of bytes to be transmitted
- * @param[out] rxbuf pointer to receive buffer
- * @param[in] rxbytes number of bytes to be received, set it to 0 if
- * you want transmit only
- * @param[in] timeout the number of ticks before the operation timeouts,
- * the following special values are allowed:
- * - @a TIME_INFINITE no timeout.
- * .
- *
- * @return The operation status.
- * @retval RDY_OK if the function succeeded.
- * @retval RDY_RESET if one or more I2C errors occurred, the errors can
- * be retrieved using @p i2cGetErrors().
- * @retval RDY_TIMEOUT if a timeout occurred before operation end.
- *
- * @api
- */
-msg_t i2cMasterTransmitTimeout(I2CDriver *i2cp,
- i2caddr_t addr,
- const uint8_t *txbuf,
- size_t txbytes,
- uint8_t *rxbuf,
- size_t rxbytes,
- systime_t timeout) {
- msg_t rdymsg;
-
- chDbgCheck((i2cp != NULL) && (addr != 0) &&
- (txbytes > 0) && (txbuf != NULL) &&
- ((rxbytes == 0) || ((rxbytes > 0) && (rxbuf != NULL))) &&
- (timeout != TIME_IMMEDIATE),
- "i2cMasterTransmitTimeout");
-
- chDbgAssert(i2cp->state == I2C_READY,
- "i2cMasterTransmitTimeout(), #1", "not ready");
-
- chSysLock();
- i2cp->errors = I2CD_NO_ERROR;
- i2cp->state = I2C_ACTIVE_TX;
- rdymsg = i2c_lld_master_transmit_timeout(i2cp, addr, txbuf, txbytes,
- rxbuf, rxbytes, timeout);
- if (rdymsg == RDY_TIMEOUT)
- i2cp->state = I2C_LOCKED;
- else
- i2cp->state = I2C_READY;
- chSysUnlock();
- return rdymsg;
-}
-
-/**
- * @brief Receives data from the I2C bus.
- *
- * @param[in] i2cp pointer to the @p I2CDriver object
- * @param[in] addr slave device address (7 bits) without R/W bit
- * @param[out] rxbuf pointer to receive buffer
- * @param[in] rxbytes number of bytes to be received
- * @param[in] timeout the number of ticks before the operation timeouts,
- * the following special values are allowed:
- * - @a TIME_INFINITE no timeout.
- * .
- *
- * @return The operation status.
- * @retval RDY_OK if the function succeeded.
- * @retval RDY_RESET if one or more I2C errors occurred, the errors can
- * be retrieved using @p i2cGetErrors().
- * @retval RDY_TIMEOUT if a timeout occurred before operation end.
- *
- * @api
- */
-msg_t i2cMasterReceiveTimeout(I2CDriver *i2cp,
- i2caddr_t addr,
- uint8_t *rxbuf,
- size_t rxbytes,
- systime_t timeout){
-
- msg_t rdymsg;
-
- chDbgCheck((i2cp != NULL) && (addr != 0) &&
- (rxbytes > 0) && (rxbuf != NULL) &&
- (timeout != TIME_IMMEDIATE),
- "i2cMasterReceiveTimeout");
-
- chDbgAssert(i2cp->state == I2C_READY,
- "i2cMasterReceive(), #1", "not ready");
-
- chSysLock();
- i2cp->errors = I2CD_NO_ERROR;
- i2cp->state = I2C_ACTIVE_RX;
- rdymsg = i2c_lld_master_receive_timeout(i2cp, addr, rxbuf, rxbytes, timeout);
- if (rdymsg == RDY_TIMEOUT)
- i2cp->state = I2C_LOCKED;
- else
- i2cp->state = I2C_READY;
- chSysUnlock();
- return rdymsg;
-}
-
-#if I2C_USE_MUTUAL_EXCLUSION || defined(__DOXYGEN__)
-/**
- * @brief Gains exclusive access to the I2C bus.
- * @details This function tries to gain ownership to the SPI bus, if the bus
- * is already being used then the invoking thread is queued.
- * @pre In order to use this function the option @p I2C_USE_MUTUAL_EXCLUSION
- * must be enabled.
- *
- * @param[in] i2cp pointer to the @p I2CDriver object
- *
- * @api
- */
-void i2cAcquireBus(I2CDriver *i2cp) {
-
- chDbgCheck(i2cp != NULL, "i2cAcquireBus");
-
-#if CH_CFG_USE_MUTEXES
- chMtxLock(&i2cp->mutex);
-#elif CH_CFG_USE_SEMAPHORES
- chSemWait(&i2cp->semaphore);
-#endif
-}
-
-/**
- * @brief Releases exclusive access to the I2C bus.
- * @pre In order to use this function the option @p I2C_USE_MUTUAL_EXCLUSION
- * must be enabled.
- *
- * @param[in] i2cp pointer to the @p I2CDriver object
- *
- * @api
- */
-void i2cReleaseBus(I2CDriver *i2cp) {
-
- chDbgCheck(i2cp != NULL, "i2cReleaseBus");
-
-#if CH_CFG_USE_MUTEXES
- chMtxUnlock();
-#elif CH_CFG_USE_SEMAPHORES
- chSemSignal(&i2cp->semaphore);
-#endif
-}
-#endif /* I2C_USE_MUTUAL_EXCLUSION */
-
-#endif /* HAL_USE_I2C */
-
-/** @} */
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