amiro-lld / drivers / PCA9544A / v1 / alld_PCA9544A.c @ ed9a1bf5
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/*
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AMiRo-LLD is a compilation of low-level hardware drivers for the Autonomous Mini Robot (AMiRo) platform.
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Copyright (C) 2016..2020 Thomas Schöpping et al.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser 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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This program 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 Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser 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 alld_PCA9544A.c
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* @brief I2C Multiplexer function implementations.
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*
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* @addtogroup lld_multi
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* @{
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*/
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#include <alld_PCA9544A.h> |
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/******************************************************************************/
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/* LOCAL DEFINITIONS */
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/******************************************************************************/
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/******************************************************************************/
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/* EXPORTED VARIABLES */
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/******************************************************************************/
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/******************************************************************************/
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/* LOCAL TYPES */
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/******************************************************************************/
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/******************************************************************************/
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/* LOCAL VARIABLES */
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/******************************************************************************/
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/******************************************************************************/
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/* LOCAL FUNCTIONS */
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/******************************************************************************/
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/******************************************************************************/
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/* EXPORTED FUNCTIONS */
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/******************************************************************************/
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/**
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* @brief Read the control register of the PCA9544A.
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*
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* @param[in] pca9544a The PCA9544A driver object.
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* @param[out] data The data read from the PCA9544A.
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* @param[in] timeout Timeout for the function to return (in microseconds)
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*
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* @return The return status indicates whether the function call was succesfull or a timeout occurred.
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*/
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apalExitStatus_t pca9544a_lld_read(const PCA9544ADriver* const pca9544a, uint8_t* const data, const apalTime_t timeout) |
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{
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apalDbgAssert(pca9544a != NULL);
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apalDbgAssert(data != NULL);
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return apalI2CMasterReceive(pca9544a->i2cd, (PCA9544A_LLD_I2C_ADDR_FIXED | pca9544a->addr), data, 1, timeout); |
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} |
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/**
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* @brief Set the control register of the PCA9544A.
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*
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* @param[in] pca9544a The PCA9544A driver object.
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* @param[in] data The value to write to the PCA9544A.
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* @param[in] timeout Timeout for the function to return (in microseconds)
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*
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* @return The return status indicates whether the function call was succesfull or a timeout occurred.
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*/
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apalExitStatus_t pca9544a_lld_write(const PCA9544ADriver* const pca9544a, const uint8_t data, const apalTime_t timeout) |
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{
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apalDbgAssert(pca9544a != NULL);
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return apalI2CMasterTransmit(pca9544a->i2cd, (PCA9544A_LLD_I2C_ADDR_FIXED | pca9544a->addr), &data, 1, NULL, 0, timeout); |
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} |
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/**
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* @brief Read the interrupt status.
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*
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* @param[in] pca9544a The PCA9544A driver object.
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* @param[out] status The status of the four interrupts.
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* @param[in] timeout Timeout for the function to return (in microseconds)
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*
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* @return The return status indicates whether the function call was succesfull or a timeout occurred.
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*/
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apalExitStatus_t pca9544a_lld_getintstatus(const PCA9544ADriver* const pca9544a, pca9544a_lld_intstatus_t* const status, const apalTime_t timeout) |
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{
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apalDbgAssert(pca9544a != NULL);
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apalDbgAssert(status != NULL);
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uint8_t buffer; |
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apalExitStatus_t stat = apalI2CMasterReceive(pca9544a->i2cd, (PCA9544A_LLD_I2C_ADDR_FIXED | pca9544a->addr), &buffer, 1, timeout);
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*status = buffer >> 4;
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return stat;
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} |
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/**
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* @brief Read which channel is currently set.
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*
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* @param[in] pca9544a The PCA9544A driver object.
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* @param[out] channel The identifier of the set channel.
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* @param[in] timeout Timeout for the function to return (in microseconds)
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*
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* @return The return status indicates whether the function call was succesfull or a timeout occurred.
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*/
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apalExitStatus_t pca9544a_lld_getcurrentchannel(const PCA9544ADriver* const pca9544a, pca9544a_lld_chid_t* const channel, const apalTime_t timeout) |
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{
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apalDbgAssert(pca9544a != NULL);
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apalDbgAssert(channel != NULL);
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uint8_t buffer; |
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apalExitStatus_t stat = apalI2CMasterReceive(pca9544a->i2cd, (PCA9544A_LLD_I2C_ADDR_FIXED | pca9544a->addr), &buffer, 1, timeout);
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if (buffer & PCA9544A_LLD_CTRLREG_EN) {
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*channel = buffer & PCA9544A_LLD_CTRLREG_CH_MASK; |
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} else {
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*channel = PCA9544A_LLD_CH_NONE; |
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} |
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return stat;
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} |
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/**
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* @brief Set the channel for multiplexing.
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*
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* @param[in] pca9544a The PCA9544A driver object.
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* @param[in] channel The channel to set for multiplexing.
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* @param[in] timeout Timeout for the function to return (in microseconds)
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*
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* @return The return status indicates whether the function call was succesfull or a timeout occurred.
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*/
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apalExitStatus_t pca9544a_lld_setchannel(const PCA9544ADriver* const pca9544a, const pca9544a_lld_chid_t channel, const apalTime_t timeout) |
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{
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apalDbgAssert(pca9544a != NULL);
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uint8_t buffer = (channel == PCA9544A_LLD_CH_NONE) ? 0x00u : (PCA9544A_LLD_CTRLREG_EN | channel);
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return apalI2CMasterTransmit(pca9544a->i2cd, (PCA9544A_LLD_I2C_ADDR_FIXED | pca9544a->addr), &buffer, 1, NULL, 0, timeout); |
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} |
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/** @} */
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