amiro-lld / drivers / PCA9544A / v1 / alld_PCA9544A.c @ c9774bf5
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| 1 | d6728c5b | Thomas Schöpping | /*
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| 2 | AMiRo-LLD is a compilation of low-level hardware drivers for the Autonomous Mini Robot (AMiRo) platform.
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| 3 | f125ae07 | Thomas Schöpping | Copyright (C) 2016..2019 Thomas Schöpping et al.
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| 4 | d6728c5b | Thomas Schöpping | |
| 5 | This program is free software: you can redistribute it and/or modify
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| 6 | f0ca400f | Thomas Schöpping | it under the terms of the GNU Lesser General Public License as published by
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| 7 | d6728c5b | Thomas Schöpping | the Free Software Foundation, either version 3 of the License, or
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| 8 | (at your option) any later version.
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| 9 | |||
| 10 | This program is distributed in the hope that it will be useful,
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 13 | f0ca400f | Thomas Schöpping | GNU Lesser General Public License for more details.
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| 14 | d6728c5b | Thomas Schöpping | |
| 15 | f0ca400f | Thomas Schöpping | You should have received a copy of the GNU Lesser General Public License
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| 16 | d6728c5b | Thomas Schöpping | along with this program. If not, see <http://www.gnu.org/licenses/>.
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| 17 | */
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| 18 | |||
| 19 | 5e2f673b | Marc Rothmann | /**
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| 20 | 9466e34d | Thomas Schöpping | * @file alld_PCA9544A.c
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| 21 | 5e2f673b | Marc Rothmann | * @brief I2C Multiplexer function implementations.
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| 22 | *
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| 23 | * @addtogroup lld_multi
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| 24 | * @{
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| 25 | */
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| 26 | |||
| 27 | 1d5bcc82 | Thomas Schöpping | #include <alld_PCA9544A.h> |
| 28 | d6728c5b | Thomas Schöpping | |
| 29 | ef078306 | Thomas Schöpping | /******************************************************************************/
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| 30 | /* LOCAL DEFINITIONS */
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| 31 | /******************************************************************************/
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| 32 | |||
| 33 | /******************************************************************************/
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| 34 | /* EXPORTED VARIABLES */
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| 35 | /******************************************************************************/
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| 36 | |||
| 37 | /******************************************************************************/
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| 38 | /* LOCAL TYPES */
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| 39 | /******************************************************************************/
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| 40 | |||
| 41 | /******************************************************************************/
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| 42 | /* LOCAL VARIABLES */
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| 43 | /******************************************************************************/
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| 44 | |||
| 45 | /******************************************************************************/
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| 46 | /* LOCAL FUNCTIONS */
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| 47 | /******************************************************************************/
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| 48 | |||
| 49 | /******************************************************************************/
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| 50 | /* EXPORTED FUNCTIONS */
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| 51 | /******************************************************************************/
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| 52 | |||
| 53 | d6728c5b | Thomas Schöpping | /**
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| 54 | * @brief Read the control register of the PCA9544A.
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| 55 | *
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| 56 | * @param[in] pca9544a The PCA9544A driver object.
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| 57 | * @param[out] data The data read from the PCA9544A.
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| 58 | * @param[in] timeout Timeout for the function to return (in microseconds)
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| 59 | *
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| 60 | * @return The return status indicates whether the function call was succesfull or a timeout occurred.
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| 61 | */
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| 62 | 21076167 | Thomas Schöpping | apalExitStatus_t pca9544a_lld_read(const PCA9544ADriver* const pca9544a, uint8_t* const data, const apalTime_t timeout) |
| 63 | d6728c5b | Thomas Schöpping | {
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| 64 | apalDbgAssert(pca9544a != NULL);
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| 65 | apalDbgAssert(data != NULL);
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| 66 | |||
| 67 | return apalI2CMasterReceive(pca9544a->i2cd, (PCA9544A_LLD_I2C_ADDR_FIXED | pca9544a->addr), data, 1, timeout); |
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| 68 | } |
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| 69 | |||
| 70 | /**
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| 71 | * @brief Set the control register of the PCA9544A.
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| 72 | *
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| 73 | * @param[in] pca9544a The PCA9544A driver object.
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| 74 | * @param[in] data The value to write to the PCA9544A.
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| 75 | * @param[in] timeout Timeout for the function to return (in microseconds)
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| 76 | *
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| 77 | * @return The return status indicates whether the function call was succesfull or a timeout occurred.
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| 78 | */
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| 79 | 21076167 | Thomas Schöpping | apalExitStatus_t pca9544a_lld_write(const PCA9544ADriver* const pca9544a, const uint8_t data, const apalTime_t timeout) |
| 80 | d6728c5b | Thomas Schöpping | {
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| 81 | apalDbgAssert(pca9544a != NULL);
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| 82 | |||
| 83 | return apalI2CMasterTransmit(pca9544a->i2cd, (PCA9544A_LLD_I2C_ADDR_FIXED | pca9544a->addr), &data, 1, NULL, 0, timeout); |
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| 84 | } |
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| 85 | |||
| 86 | /**
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| 87 | * @brief Read the interrupt status.
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| 88 | *
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| 89 | * @param[in] pca9544a The PCA9544A driver object.
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| 90 | * @param[out] status The status of the four interrupts.
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| 91 | * @param[in] timeout Timeout for the function to return (in microseconds)
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| 92 | *
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| 93 | * @return The return status indicates whether the function call was succesfull or a timeout occurred.
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| 94 | */
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| 95 | 21076167 | Thomas Schöpping | apalExitStatus_t pca9544a_lld_getintstatus(const PCA9544ADriver* const pca9544a, pca9544a_lld_intstatus_t* const status, const apalTime_t timeout) |
| 96 | d6728c5b | Thomas Schöpping | {
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| 97 | apalDbgAssert(pca9544a != NULL);
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| 98 | apalDbgAssert(status != NULL);
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| 99 | |||
| 100 | uint8_t buffer; |
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| 101 | apalExitStatus_t stat = apalI2CMasterReceive(pca9544a->i2cd, (PCA9544A_LLD_I2C_ADDR_FIXED | pca9544a->addr), &buffer, 1, timeout);
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| 102 | *status = buffer >> 4;
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| 103 | return stat;
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| 104 | } |
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| 105 | |||
| 106 | /**
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| 107 | * @brief Read which channel is currently set.
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| 108 | *
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| 109 | * @param[in] pca9544a The PCA9544A driver object.
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| 110 | * @param[out] channel The identifier of the set channel.
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| 111 | * @param[in] timeout Timeout for the function to return (in microseconds)
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| 112 | *
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| 113 | * @return The return status indicates whether the function call was succesfull or a timeout occurred.
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| 114 | */
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| 115 | 21076167 | Thomas Schöpping | apalExitStatus_t pca9544a_lld_getcurrentchannel(const PCA9544ADriver* const pca9544a, pca9544a_lld_chid_t* const channel, const apalTime_t timeout) |
| 116 | d6728c5b | Thomas Schöpping | {
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| 117 | apalDbgAssert(pca9544a != NULL);
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| 118 | apalDbgAssert(channel != NULL);
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| 119 | |||
| 120 | uint8_t buffer; |
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| 121 | apalExitStatus_t stat = apalI2CMasterReceive(pca9544a->i2cd, (PCA9544A_LLD_I2C_ADDR_FIXED | pca9544a->addr), &buffer, 1, timeout);
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| 122 | if (buffer & PCA9544A_LLD_CTRLREG_EN) {
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| 123 | *channel = buffer & PCA9544A_LLD_CTRLREG_CH_MASK; |
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| 124 | } else {
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| 125 | *channel = PCA9544A_LLD_CH_NONE; |
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| 126 | } |
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| 127 | return stat;
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| 128 | } |
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| 129 | |||
| 130 | /**
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| 131 | * @brief Set the channel for multiplexing.
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| 132 | *
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| 133 | * @param[in] pca9544a The PCA9544A driver object.
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| 134 | * @param[in] channel The channel to set for multiplexing.
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| 135 | * @param[in] timeout Timeout for the function to return (in microseconds)
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| 136 | *
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| 137 | * @return The return status indicates whether the function call was succesfull or a timeout occurred.
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| 138 | */
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| 139 | 21076167 | Thomas Schöpping | apalExitStatus_t pca9544a_lld_setchannel(const PCA9544ADriver* const pca9544a, const pca9544a_lld_chid_t channel, const apalTime_t timeout) |
| 140 | d6728c5b | Thomas Schöpping | {
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| 141 | apalDbgAssert(pca9544a != NULL);
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| 142 | |||
| 143 | uint8_t buffer = (channel == PCA9544A_LLD_CH_NONE) ? 0x00u : (PCA9544A_LLD_CTRLREG_EN | channel);
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| 144 | return apalI2CMasterTransmit(pca9544a->i2cd, (PCA9544A_LLD_I2C_ADDR_FIXED | pca9544a->addr), &buffer, 1, NULL, 0, timeout); |
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| 145 | } |
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| 146 | |||
| 147 | 5e2f673b | Marc Rothmann | /** @} */
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