amiro-lld / source / alld_pca9544a.c @ 8c47f14b
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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 | * @file alld_pca9544a.c
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21 | * @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 | d6728c5b | Thomas Schöpping | #include <alld_pca9544a.h> |
28 | |||
29 | #if defined(AMIROLLD_CFG_USE_PCA9544A) || defined(__DOXYGEN__)
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30 | |||
31 | /**
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32 | * @brief Read the control register of the PCA9544A.
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33 | *
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34 | * @param[in] pca9544a The PCA9544A driver object.
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35 | * @param[out] data The data read from the PCA9544A.
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36 | * @param[in] timeout Timeout for the function to return (in microseconds)
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37 | *
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38 | * @return The return status indicates whether the function call was succesfull or a timeout occurred.
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39 | */
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40 | inline apalExitStatus_t
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41 | pca9544a_lld_read(const PCA9544ADriver* const pca9544a, uint8_t* const data, const apalTime_t timeout) |
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42 | { |
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43 | apalDbgAssert(pca9544a != NULL);
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44 | apalDbgAssert(data != NULL);
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45 | |||
46 | return apalI2CMasterReceive(pca9544a->i2cd, (PCA9544A_LLD_I2C_ADDR_FIXED | pca9544a->addr), data, 1, timeout); |
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47 | } |
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48 | |||
49 | /**
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50 | * @brief Set the control register of the PCA9544A.
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51 | *
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52 | * @param[in] pca9544a The PCA9544A driver object.
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53 | * @param[in] data The value to write to the PCA9544A.
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54 | * @param[in] timeout Timeout for the function to return (in microseconds)
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55 | *
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56 | * @return The return status indicates whether the function call was succesfull or a timeout occurred.
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57 | */
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58 | inline apalExitStatus_t
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59 | pca9544a_lld_write(const PCA9544ADriver* const pca9544a, const uint8_t data, const apalTime_t timeout) |
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60 | { |
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61 | apalDbgAssert(pca9544a != NULL);
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62 | |||
63 | return apalI2CMasterTransmit(pca9544a->i2cd, (PCA9544A_LLD_I2C_ADDR_FIXED | pca9544a->addr), &data, 1, NULL, 0, timeout); |
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64 | } |
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65 | |||
66 | /**
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67 | * @brief Read the interrupt status.
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68 | *
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69 | * @param[in] pca9544a The PCA9544A driver object.
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70 | * @param[out] status The status of the four interrupts.
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71 | * @param[in] timeout Timeout for the function to return (in microseconds)
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72 | *
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73 | * @return The return status indicates whether the function call was succesfull or a timeout occurred.
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74 | */
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75 | inline apalExitStatus_t
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76 | pca9544a_lld_getintstatus(const PCA9544ADriver* const pca9544a, pca9544a_lld_intstatus_t* const status, const apalTime_t timeout) |
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77 | { |
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78 | apalDbgAssert(pca9544a != NULL);
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79 | apalDbgAssert(status != NULL);
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80 | |||
81 | uint8_t buffer; |
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82 | apalExitStatus_t stat = apalI2CMasterReceive(pca9544a->i2cd, (PCA9544A_LLD_I2C_ADDR_FIXED | pca9544a->addr), &buffer, 1, timeout);
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83 | *status = buffer >> 4;
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84 | return stat;
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85 | } |
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86 | |||
87 | /**
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88 | * @brief Read which channel is currently set.
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89 | *
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90 | * @param[in] pca9544a The PCA9544A driver object.
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91 | * @param[out] channel The identifier of the set channel.
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92 | * @param[in] timeout Timeout for the function to return (in microseconds)
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93 | *
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94 | * @return The return status indicates whether the function call was succesfull or a timeout occurred.
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95 | */
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96 | inline apalExitStatus_t
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97 | pca9544a_lld_getcurrentchannel(const PCA9544ADriver* const pca9544a, pca9544a_lld_chid_t* const channel, const apalTime_t timeout) |
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98 | { |
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99 | apalDbgAssert(pca9544a != NULL);
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100 | apalDbgAssert(channel != NULL);
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101 | |||
102 | uint8_t buffer; |
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103 | apalExitStatus_t stat = apalI2CMasterReceive(pca9544a->i2cd, (PCA9544A_LLD_I2C_ADDR_FIXED | pca9544a->addr), &buffer, 1, timeout);
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104 | if (buffer & PCA9544A_LLD_CTRLREG_EN) {
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105 | *channel = buffer & PCA9544A_LLD_CTRLREG_CH_MASK; |
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106 | } else {
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107 | *channel = PCA9544A_LLD_CH_NONE; |
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108 | } |
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109 | return stat;
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110 | } |
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111 | |||
112 | /**
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113 | * @brief Set the channel for multiplexing.
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114 | *
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115 | * @param[in] pca9544a The PCA9544A driver object.
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116 | * @param[in] channel The channel to set for multiplexing.
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117 | * @param[in] timeout Timeout for the function to return (in microseconds)
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118 | *
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119 | * @return The return status indicates whether the function call was succesfull or a timeout occurred.
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120 | */
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121 | inline apalExitStatus_t
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122 | pca9544a_lld_setchannel(const PCA9544ADriver* const pca9544a, const pca9544a_lld_chid_t channel, const apalTime_t timeout) |
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123 | { |
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124 | apalDbgAssert(pca9544a != NULL);
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125 | |||
126 | uint8_t buffer = (channel == PCA9544A_LLD_CH_NONE) ? 0x00u : (PCA9544A_LLD_CTRLREG_EN | channel);
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127 | return apalI2CMasterTransmit(pca9544a->i2cd, (PCA9544A_LLD_I2C_ADDR_FIXED | pca9544a->addr), &buffer, 1, NULL, 0, timeout); |
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128 | } |
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129 | |||
130 | #endif /* defined(AMIROLLD_CFG_USE_PCA9544A) */ |
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131 | 5e2f673b | Marc Rothmann | |
132 | /** @} */ |