Thu, 06 Apr 2023 20:53:06 +0200
Set the new measured deep sleep current consumption. This is half of the Wemos D1 system.
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1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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1 | /* |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
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2 | * Copyright (c) 2017 Gunar Schorcht <https://github.com/gschorcht> |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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3 | * Copyright (c) 2019 Ruslan V. Uss <unclerus@gmail.com> |
1c9894662795
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4 | * |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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5 | * Redistribution and use in source and binary forms, with or without |
1c9894662795
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6 | * modification, are permitted provided that the following conditions are met: |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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7 | * |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
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8 | * 1. Redistributions of source code must retain the above copyright notice, |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
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9 | * this list of conditions and the following disclaimer. |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
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10 | * 2. Redistributions in binary form must reproduce the above copyright notice, |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
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11 | * this list of conditions and the following disclaimer in the documentation |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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12 | * and/or other materials provided with the distribution. |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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13 | * 3. Neither the name of the copyright holder nor the names of itscontributors |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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14 | * may be used to endorse or promote products derived from this software without |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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15 | * specific prior written permission. |
1c9894662795
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16 | * |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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17 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
1c9894662795
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18 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
1c9894662795
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20 | * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE |
1c9894662795
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21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
1c9894662795
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22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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23 | * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
1c9894662795
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24 | * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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25 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
1c9894662795
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26 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
1c9894662795
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27 | */ |
1c9894662795
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28 | |
1c9894662795
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29 | /** |
1c9894662795
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30 | * @file sht3x.c |
1c9894662795
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31 | * |
1c9894662795
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32 | * ESP-IDF driver for Sensirion SHT3x digital temperature and humidity sensor |
1c9894662795
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33 | * |
1c9894662795
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34 | * Forked from <https://github.com/gschorcht/sht3x-esp-idf> |
1c9894662795
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35 | * |
1c9894662795
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36 | * Copyright (c) 2017 Gunar Schorcht <https://github.com/gschorcht>\n |
1c9894662795
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37 | * Copyright (c) 2019 Ruslan V. Uss <unclerus@gmail.com> |
1c9894662795
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38 | * |
1c9894662795
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39 | * BSD Licensed as described in the file LICENSE |
1c9894662795
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40 | */ |
1c9894662795
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41 | |
1c9894662795
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42 | #include <esp_log.h> |
1c9894662795
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43 | #include <freertos/FreeRTOS.h> |
1c9894662795
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44 | #include <freertos/task.h> |
1c9894662795
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45 | #include <esp_timer.h> |
1c9894662795
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46 | #include <esp_idf_lib_helpers.h> |
1c9894662795
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47 | #include "sht3x.h" |
1c9894662795
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48 | |
1c9894662795
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49 | #define I2C_FREQ_HZ 1000000 // 1MHz |
1c9894662795
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50 | |
1c9894662795
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51 | const char *TAG = "sht3x"; |
1c9894662795
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52 | |
1c9894662795
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53 | #define SHT3X_STATUS_CMD 0xF32D |
1c9894662795
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54 | #define SHT3X_CLEAR_STATUS_CMD 0x3041 |
1c9894662795
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55 | #define SHT3X_RESET_CMD 0x30A2 |
1c9894662795
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56 | #define SHT3X_FETCH_DATA_CMD 0xE000 |
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57 | #define SHT3X_STOP_PERIODIC_MEAS_CMD 0x3093 |
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58 | #define SHT3X_HEATER_ON_CMD 0x306D |
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59 | #define SHT3X_HEATER_OFF_CMD 0x3066 |
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60 | |
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61 | static const uint16_t SHT3X_MEASURE_CMD[6][3] = { |
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62 | {0x2400, 0x240b, 0x2416}, // [SINGLE_SHOT][H,M,L] without clock stretching |
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63 | {0x2032, 0x2024, 0x202f}, // [PERIODIC_05][H,M,L] |
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64 | {0x2130, 0x2126, 0x212d}, // [PERIODIC_1 ][H,M,L] |
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65 | {0x2236, 0x2220, 0x222b}, // [PERIODIC_2 ][H,M,L] |
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66 | {0x2334, 0x2322, 0x2329}, // [PERIODIC_4 ][H,M,L] |
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67 | {0x2737, 0x2721, 0x272a} // [PERIODIC_10][H,M,L] |
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68 | }; |
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69 | |
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70 | // due to the fact that ticks can be smaller than portTICK_PERIOD_MS, one and |
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71 | // a half tick period added to the duration to be sure that waiting time for |
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72 | // the results is long enough |
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73 | #define TIME_TO_TICKS(ms) (1 + ((ms) + (portTICK_PERIOD_MS-1) + portTICK_PERIOD_MS/2 ) / portTICK_PERIOD_MS) |
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74 | |
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75 | #define SHT3X_MEAS_DURATION_REP_HIGH 15 |
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76 | #define SHT3X_MEAS_DURATION_REP_MEDIUM 6 |
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77 | #define SHT3X_MEAS_DURATION_REP_LOW 4 |
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78 | |
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79 | // measurement durations in us |
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80 | static const uint16_t SHT3X_MEAS_DURATION_US[3] = { |
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81 | SHT3X_MEAS_DURATION_REP_HIGH * 1000, |
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82 | SHT3X_MEAS_DURATION_REP_MEDIUM * 1000, |
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83 | SHT3X_MEAS_DURATION_REP_LOW * 1000 |
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84 | }; |
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85 | |
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86 | // measurement durations in RTOS ticks |
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87 | static const uint8_t SHT3X_MEAS_DURATION_TICKS[3] = { |
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88 | TIME_TO_TICKS(SHT3X_MEAS_DURATION_REP_HIGH), |
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89 | TIME_TO_TICKS(SHT3X_MEAS_DURATION_REP_MEDIUM), |
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90 | TIME_TO_TICKS(SHT3X_MEAS_DURATION_REP_LOW) |
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91 | }; |
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92 | |
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93 | #define CHECK(x) do { esp_err_t __; if ((__ = x) != ESP_OK) return __; } while (0) |
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94 | #define CHECK_ARG(VAL) do { if (!(VAL)) return ESP_ERR_INVALID_ARG; } while (0) |
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95 | |
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96 | #define G_POLYNOM 0x31 |
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97 | |
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98 | static inline uint16_t shuffle(uint16_t val) |
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99 | { |
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100 | return (val >> 8) | (val << 8); |
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101 | } |
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102 | |
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103 | static uint8_t crc8(uint8_t data[], int len) |
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104 | { |
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105 | // initialization value |
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106 | uint8_t crc = 0xff; |
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107 | |
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108 | // iterate over all bytes |
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109 | for (int i = 0; i < len; i++) |
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110 | { |
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111 | crc ^= data[i]; |
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112 | for (int i = 0; i < 8; i++) |
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113 | { |
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114 | bool xor = crc & 0x80; |
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115 | crc = crc << 1; |
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116 | crc = xor ? crc ^ G_POLYNOM : crc; |
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117 | } |
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118 | } |
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119 | return crc; |
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120 | } |
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121 | |
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122 | static esp_err_t send_cmd_nolock(sht3x_t *dev, uint16_t cmd) |
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123 | { |
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124 | cmd = shuffle(cmd); |
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125 | |
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126 | return i2c_dev_write(&dev->i2c_dev, NULL, 0, &cmd, 2); |
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127 | } |
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128 | |
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129 | static esp_err_t send_cmd(sht3x_t *dev, uint16_t cmd) |
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130 | { |
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131 | I2C_DEV_TAKE_MUTEX(&dev->i2c_dev); |
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132 | I2C_DEV_CHECK(&dev->i2c_dev, send_cmd_nolock(dev, cmd)); |
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133 | I2C_DEV_GIVE_MUTEX(&dev->i2c_dev); |
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134 | |
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135 | return ESP_OK; |
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136 | } |
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137 | |
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138 | static esp_err_t start_nolock(sht3x_t *dev, sht3x_mode_t mode, sht3x_repeat_t repeat) |
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139 | { |
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140 | dev->mode = mode; |
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141 | dev->repeatability = repeat; |
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142 | CHECK(send_cmd_nolock(dev, SHT3X_MEASURE_CMD[mode][repeat])); |
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143 | dev->meas_start_time = esp_timer_get_time(); |
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144 | dev->meas_started = true; |
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145 | dev->meas_first = true; |
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146 | |
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147 | return ESP_OK; |
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148 | } |
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149 | |
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150 | static inline bool is_measuring(sht3x_t *dev) |
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151 | { |
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152 | // not running if measurement is not started at all or |
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153 | // it is not the first measurement in periodic mode |
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154 | if (!dev->meas_started || !dev->meas_first) |
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155 | return false; |
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156 | |
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157 | // not running if time elapsed is greater than duration |
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158 | uint64_t elapsed = esp_timer_get_time() - dev->meas_start_time; |
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159 | |
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160 | return elapsed < SHT3X_MEAS_DURATION_US[dev->repeatability]; |
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161 | } |
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162 | |
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163 | static esp_err_t get_raw_data_nolock(sht3x_t *dev, sht3x_raw_data_t raw_data) |
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164 | { |
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165 | if (!dev->meas_started) |
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166 | { |
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167 | ESP_LOGE(TAG, "Measurement is not started"); |
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168 | return ESP_ERR_INVALID_STATE; |
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169 | } |
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170 | if (is_measuring(dev)) |
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171 | { |
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172 | ESP_LOGE(TAG, "Measurement is still running"); |
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173 | return ESP_ERR_INVALID_STATE; |
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174 | } |
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175 | |
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176 | // read raw data |
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177 | uint16_t cmd = shuffle(SHT3X_FETCH_DATA_CMD); |
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178 | CHECK(i2c_dev_read(&dev->i2c_dev, &cmd, 2, raw_data, sizeof(sht3x_raw_data_t))); |
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179 | |
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180 | // reset first measurement flag |
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181 | dev->meas_first = false; |
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182 | |
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183 | // reset measurement started flag in single shot mode |
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184 | if (dev->mode == SHT3X_SINGLE_SHOT) |
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185 | dev->meas_started = false; |
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186 | |
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187 | // check temperature crc |
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188 | if (crc8(raw_data, 2) != raw_data[2]) |
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189 | { |
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190 | ESP_LOGE(TAG, "CRC check for temperature data failed"); |
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191 | return ESP_ERR_INVALID_CRC; |
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192 | } |
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193 | |
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194 | // check humidity crc |
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195 | if (crc8(raw_data + 3, 2) != raw_data[5]) |
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196 | { |
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197 | ESP_LOGE(TAG, "CRC check for humidity data failed"); |
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198 | return ESP_ERR_INVALID_CRC; |
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199 | } |
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200 | |
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201 | return ESP_OK; |
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202 | } |
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203 | |
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204 | /////////////////////////////////////////////////////////////////////////////// |
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205 | |
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206 | esp_err_t sht3x_init_desc(sht3x_t *dev, uint8_t addr, i2c_port_t port, gpio_num_t sda_gpio, gpio_num_t scl_gpio) |
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207 | { |
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208 | CHECK_ARG(dev); |
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209 | |
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210 | dev->i2c_dev.port = port; |
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211 | dev->i2c_dev.addr = addr; |
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212 | dev->i2c_dev.cfg.sda_io_num = sda_gpio; |
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213 | dev->i2c_dev.cfg.scl_io_num = scl_gpio; |
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214 | #if HELPER_TARGET_IS_ESP32 |
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215 | dev->i2c_dev.cfg.master.clk_speed = I2C_FREQ_HZ; |
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216 | #endif |
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217 | |
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218 | return i2c_dev_create_mutex(&dev->i2c_dev); |
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219 | } |
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220 | |
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221 | esp_err_t sht3x_free_desc(sht3x_t *dev) |
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222 | { |
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223 | CHECK_ARG(dev); |
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224 | |
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225 | return i2c_dev_delete_mutex(&dev->i2c_dev); |
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226 | } |
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227 | |
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228 | esp_err_t sht3x_init(sht3x_t *dev) |
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229 | { |
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230 | CHECK_ARG(dev); |
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231 | |
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232 | dev->mode = SHT3X_SINGLE_SHOT; |
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233 | dev->meas_start_time = 0; |
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234 | dev->meas_started = false; |
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235 | dev->meas_first = false; |
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236 | |
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237 | return send_cmd(dev, SHT3X_CLEAR_STATUS_CMD); |
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238 | } |
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239 | |
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240 | esp_err_t sht3x_set_heater(sht3x_t *dev, bool enable) |
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241 | { |
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242 | CHECK_ARG(dev); |
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243 | |
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244 | return send_cmd(dev, enable ? SHT3X_HEATER_ON_CMD : SHT3X_HEATER_OFF_CMD); |
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245 | } |
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246 | |
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247 | esp_err_t sht3x_compute_values(sht3x_raw_data_t raw_data, float *temperature, float *humidity) |
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248 | { |
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249 | CHECK_ARG(raw_data && (temperature || humidity)); |
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250 | |
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251 | if (temperature) |
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252 | *temperature = ((((raw_data[0] * 256.0) + raw_data[1]) * 175) / 65535.0) - 45; |
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253 | |
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254 | if (humidity) |
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255 | *humidity = ((((raw_data[3] * 256.0) + raw_data[4]) * 100) / 65535.0); |
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256 | |
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257 | return ESP_OK; |
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258 | } |
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259 | |
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260 | esp_err_t sht3x_measure(sht3x_t *dev, float *temperature, float *humidity) |
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261 | { |
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262 | CHECK_ARG(dev && (temperature || humidity)); |
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263 | |
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264 | sht3x_raw_data_t raw_data; |
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265 | |
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266 | I2C_DEV_TAKE_MUTEX(&dev->i2c_dev); |
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267 | I2C_DEV_CHECK(&dev->i2c_dev, start_nolock(dev, SHT3X_SINGLE_SHOT, SHT3X_HIGH)); |
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268 | vTaskDelay(SHT3X_MEAS_DURATION_TICKS[SHT3X_HIGH]); |
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269 | I2C_DEV_CHECK(&dev->i2c_dev, get_raw_data_nolock(dev, raw_data)); |
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270 | I2C_DEV_GIVE_MUTEX(&dev->i2c_dev); |
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271 | |
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272 | return sht3x_compute_values(raw_data, temperature, humidity); |
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273 | } |
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274 | |
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275 | uint8_t sht3x_get_measurement_duration(sht3x_repeat_t repeat) |
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276 | { |
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277 | return SHT3X_MEAS_DURATION_TICKS[repeat]; // in RTOS ticks |
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278 | } |
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279 | |
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280 | esp_err_t sht3x_start_measurement(sht3x_t *dev, sht3x_mode_t mode, sht3x_repeat_t repeat) |
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281 | { |
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282 | CHECK_ARG(dev); |
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283 | |
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284 | I2C_DEV_TAKE_MUTEX(&dev->i2c_dev); |
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285 | I2C_DEV_CHECK(&dev->i2c_dev, start_nolock(dev, mode, repeat)); |
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286 | I2C_DEV_GIVE_MUTEX(&dev->i2c_dev); |
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287 | |
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288 | return ESP_OK; |
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289 | } |
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290 | |
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291 | esp_err_t sht3x_stop_periodic_measurement(sht3x_t *dev) |
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292 | { |
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293 | CHECK_ARG(dev); |
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294 | |
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295 | CHECK(send_cmd(dev, SHT3X_STOP_PERIODIC_MEAS_CMD)); |
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296 | dev->mode = SHT3X_SINGLE_SHOT; |
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297 | dev->meas_start_time = 0; |
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298 | dev->meas_started = false; |
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299 | dev->meas_first = false; |
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300 | |
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301 | return ESP_OK; |
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302 | } |
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303 | |
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304 | esp_err_t sht3x_get_raw_data(sht3x_t *dev, sht3x_raw_data_t raw_data) |
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305 | { |
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306 | CHECK_ARG(dev && raw_data); |
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307 | |
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308 | I2C_DEV_TAKE_MUTEX(&dev->i2c_dev); |
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309 | I2C_DEV_CHECK(&dev->i2c_dev, get_raw_data_nolock(dev, raw_data)); |
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310 | I2C_DEV_GIVE_MUTEX(&dev->i2c_dev); |
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311 | |
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312 | return ESP_OK; |
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313 | } |
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314 | |
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315 | esp_err_t sht3x_get_results(sht3x_t *dev, float *temperature, float *humidity) |
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316 | { |
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317 | CHECK_ARG(dev && (temperature || humidity)); |
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318 | |
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319 | sht3x_raw_data_t raw_data; |
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320 | |
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321 | CHECK(sht3x_get_raw_data(dev, raw_data)); |
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322 | |
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323 | return sht3x_compute_values(raw_data, temperature, humidity); |
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324 | } |