195 lines
6.4 KiB
C
195 lines
6.4 KiB
C
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/*
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ChibiOS/RT - Copyright (C) 2006-2013 Giovanni Di Sirio
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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/**
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* @file templates/i2c_lld.c
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* @brief I2C Driver subsystem low level driver source template.
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*
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* @addtogroup I2C
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* @{
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*/
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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 local definitions. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver exported variables. */
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/*===========================================================================*/
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/**
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* @brief I2C1 driver identifier.
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*/
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#if PLATFORM_I2C_USE_I2C1 || defined(__DOXYGEN__)
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I2CDriver I2CD1;
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#endif
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/*===========================================================================*/
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/* Driver local variables and types. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver local functions. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver interrupt handlers. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver exported functions. */
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/*===========================================================================*/
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/**
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* @brief Low level I2C driver initialization.
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*
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* @notapi
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*/
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void i2c_lld_init(void) {
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#if PLATFORM_I2C_USE_I2C1
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i2cObjectInit(&I2CD1);
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#endif /* PLATFORM_I2C_USE_I2C1 */
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}
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/**
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* @brief Configures and activates the I2C peripheral.
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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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void i2c_lld_start(I2CDriver *i2cp) {
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if (i2cp->state == I2C_STOP) {
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/* Enables the peripheral.*/
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#if PLATFORM_I2C_USE_I2C1
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if (&I2CD1 == i2cp) {
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}
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#endif /* PLATFORM_I2C_USE_I2C1 */
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}
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/* Configures the peripheral.*/
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}
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/**
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* @brief Deactivates the I2C peripheral.
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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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void i2c_lld_stop(I2CDriver *i2cp) {
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if (i2cp->state != I2C_STOP) {
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/* Resets the peripheral.*/
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/* Disables the peripheral.*/
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#if PLATFORM_I2C_USE_I2C1
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if (&I2CD1 == i2cp) {
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}
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#endif /* PLATFORM_I2C_USE_I2C1 */
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}
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}
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/**
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* @brief Receives data via the I2C bus as master.
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* @details Number of receiving bytes must be more than 1 on STM32F1x. This is
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* hardware restriction.
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*
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* @param[in] i2cp pointer to the @p I2CDriver object
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* @param[in] addr slave device address
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* @param[out] rxbuf pointer to the receive buffer
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* @param[in] rxbytes number of bytes to be received
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* @param[in] timeout the number of ticks before the operation timeouts,
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* the following special values are allowed:
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* - @a TIME_INFINITE no timeout.
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* .
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* @return The operation status.
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* @retval RDY_OK if the function succeeded.
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* @retval RDY_RESET if one or more I2C errors occurred, the errors can
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* be retrieved using @p i2cGetErrors().
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* @retval RDY_TIMEOUT if a timeout occurred before operation end. <b>After a
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* timeout the driver must be stopped and restarted
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* because the bus is in an uncertain state</b>.
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*
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* @notapi
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*/
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msg_t i2c_lld_master_receive_timeout(I2CDriver *i2cp, i2caddr_t addr,
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uint8_t *rxbuf, size_t rxbytes,
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systime_t timeout) {
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(void)i2cp;
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(void)addr;
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(void)rxbuf;
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(void)rxbytes;
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(void)timeout;
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return RDY_OK;
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}
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/**
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* @brief Transmits data via the I2C bus as master.
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* @details Number of receiving bytes must be 0 or more than 1 on STM32F1x.
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* This is hardware restriction.
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*
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* @param[in] i2cp pointer to the @p I2CDriver object
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* @param[in] addr slave device address
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* @param[in] txbuf pointer to the transmit buffer
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* @param[in] txbytes number of bytes to be transmitted
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* @param[out] rxbuf pointer to the receive buffer
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* @param[in] rxbytes number of bytes to be received
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* @param[in] timeout the number of ticks before the operation timeouts,
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* the following special values are allowed:
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* - @a TIME_INFINITE no timeout.
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* .
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* @return The operation status.
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* @retval RDY_OK if the function succeeded.
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* @retval RDY_RESET if one or more I2C errors occurred, the errors can
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* be retrieved using @p i2cGetErrors().
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* @retval RDY_TIMEOUT if a timeout occurred before operation end. <b>After a
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* timeout the driver must be stopped and restarted
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* because the bus is in an uncertain state</b>.
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*
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* @notapi
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*/
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msg_t i2c_lld_master_transmit_timeout(I2CDriver *i2cp, i2caddr_t addr,
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const uint8_t *txbuf, size_t txbytes,
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uint8_t *rxbuf, size_t rxbytes,
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systime_t timeout) {
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(void)i2cp;
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(void)addr;
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(void)txbuf;
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(void)txbytes;
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(void)rxbuf;
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(void)rxbytes;
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(void)timeout;
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return RDY_OK;
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}
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#endif /* HAL_USE_I2C */
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/** @} */
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