Mon, 03 Apr 2023 20:11:29 +0200
Changed voltage range to 32 volt. Tried INA219 powersave mode, doesn't work.
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1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
parents:
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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 | * @file sgp40.c |
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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3 | * |
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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4 | * ESP-IDF driver for SGP40 Indoor Air Quality Sensor for VOC Measurements |
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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5 | * |
1c9894662795
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6 | * Copyright (c) 2020 Ruslan V. Uss <unclerus@gmail.com> |
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 | * BSD Licensed as described in the file LICENSE |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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9 | */ |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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10 | #include <esp_err.h> |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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11 | #include <esp_idf_lib_helpers.h> |
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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12 | #include <esp_log.h> |
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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13 | #include "sgp40.h" |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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14 | #include <math.h> |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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15 | #include <freertos/FreeRTOS.h> |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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16 | #include <freertos/task.h> |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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17 | #include <ets_sys.h> |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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18 | |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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19 | #define I2C_FREQ_HZ 400000 |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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20 | |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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21 | static const char *TAG = "sgp40"; |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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22 | |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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23 | #define CMD_SOFT_RESET 0x0006 |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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24 | #define CMD_FEATURESET 0x202f |
1c9894662795
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25 | #define CMD_MEASURE_RAW 0x260f |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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26 | #define CMD_SELF_TEST 0x280e |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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27 | #define CMD_SERIAL 0x3682 |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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28 | #define CMD_HEATER_OFF 0x3615 |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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29 | |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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30 | #define TIME_SOFT_RESET 10 |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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31 | #define TIME_FEATURESET 10 |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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32 | #define TIME_MEASURE_RAW 30 |
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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33 | #define TIME_SELF_TEST 250 |
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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34 | #define TIME_HEATER_OFF 10 |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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35 | #define TIME_SERIAL 10 |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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36 | |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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37 | #define SELF_TEST_OK 0xd400 |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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38 | |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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39 | #define CHECK(x) do { esp_err_t __; if ((__ = x) != ESP_OK) return __; } while (0) |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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40 | #define CHECK_ARG(ARG) do { if (!(ARG)) return ESP_ERR_INVALID_ARG; } while (0) |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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41 | |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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42 | static uint8_t crc8(const uint8_t *data, size_t count) |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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43 | { |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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44 | uint8_t res = 0xff; |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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45 | |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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46 | for (size_t i = 0; i < count; ++i) |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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47 | { |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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48 | res ^= data[i]; |
1c9894662795
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49 | for (uint8_t bit = 8; bit > 0; --bit) |
1c9894662795
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50 | { |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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51 | if (res & 0x80) |
1c9894662795
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52 | res = (res << 1) ^ 0x31; |
1c9894662795
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53 | else |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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54 | res = (res << 1); |
1c9894662795
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55 | } |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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56 | } |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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57 | return res; |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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58 | } |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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59 | |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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60 | static inline uint16_t swap(uint16_t v) |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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61 | { |
1c9894662795
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62 | return (v << 8) | (v >> 8); |
1c9894662795
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63 | } |
1c9894662795
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64 | |
1c9894662795
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65 | static esp_err_t send_cmd(i2c_dev_t *dev, uint16_t cmd, uint16_t *data, size_t words) |
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66 | { |
1c9894662795
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67 | uint8_t buf[2 + words * 3]; |
1c9894662795
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68 | // add command |
1c9894662795
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69 | *(uint16_t *)buf = swap(cmd); |
1c9894662795
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70 | if (data && words) |
1c9894662795
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71 | // add arguments |
1c9894662795
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72 | for (size_t i = 0; i < words; i++) |
1c9894662795
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73 | { |
1c9894662795
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74 | uint8_t *p = buf + 2 + i * 3; |
1c9894662795
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75 | *(uint16_t *)p = swap(data[i]); |
1c9894662795
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76 | *(p + 2) = crc8(p, 2); |
1c9894662795
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77 | } |
1c9894662795
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78 | |
1c9894662795
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79 | ESP_LOGV(TAG, "Sending buffer:"); |
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80 | ESP_LOG_BUFFER_HEX_LEVEL(TAG, buf, sizeof(buf), ESP_LOG_VERBOSE); |
1c9894662795
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81 | |
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82 | return i2c_dev_write(dev, NULL, 0, buf, sizeof(buf)); |
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83 | } |
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84 | |
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85 | static esp_err_t read_resp(i2c_dev_t *dev, uint16_t *data, size_t words) |
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86 | { |
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87 | uint8_t buf[words * 3]; |
1c9894662795
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88 | CHECK(i2c_dev_read(dev, NULL, 0, buf, sizeof(buf))); |
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89 | |
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90 | ESP_LOGV(TAG, "Received buffer:"); |
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91 | ESP_LOG_BUFFER_HEX_LEVEL(TAG, buf, sizeof(buf), ESP_LOG_VERBOSE); |
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92 | |
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93 | for (size_t i = 0; i < words; i++) |
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94 | { |
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95 | uint8_t *p = buf + i * 3; |
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96 | uint8_t crc = crc8(p, 2); |
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97 | if (crc != *(p + 2)) |
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98 | { |
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99 | ESP_LOGE(TAG, "Invalid CRC 0x%02x, expected 0x%02x", crc, *(p + 2)); |
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100 | return ESP_ERR_INVALID_CRC; |
1c9894662795
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101 | } |
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102 | data[i] = swap(*(uint16_t *)p); |
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103 | } |
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104 | return ESP_OK; |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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105 | } |
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106 | |
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107 | static esp_err_t execute_cmd(sgp40_t *dev, uint16_t cmd, uint32_t timeout_ms, |
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108 | uint16_t *out_data, size_t out_words, uint16_t *in_data, size_t in_words) |
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109 | { |
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110 | CHECK_ARG(dev); |
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111 | |
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112 | I2C_DEV_TAKE_MUTEX(&dev->i2c_dev); |
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113 | I2C_DEV_CHECK(&dev->i2c_dev, send_cmd(&dev->i2c_dev, cmd, out_data, out_words)); |
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114 | if (timeout_ms) |
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115 | { |
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116 | if (timeout_ms > 10) |
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117 | vTaskDelay(pdMS_TO_TICKS(timeout_ms)); |
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118 | else |
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119 | ets_delay_us(timeout_ms * 1000); |
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120 | } |
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121 | if (in_data && in_words) |
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122 | I2C_DEV_CHECK(&dev->i2c_dev, read_resp(&dev->i2c_dev, in_data, in_words)); |
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123 | I2C_DEV_GIVE_MUTEX(&dev->i2c_dev); |
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124 | |
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125 | return ESP_OK; |
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126 | } |
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127 | |
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128 | //////////////////////////////////////////////////////////////////////////////// |
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129 | |
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130 | esp_err_t sgp40_init_desc(sgp40_t *dev, i2c_port_t port, gpio_num_t sda_gpio, gpio_num_t scl_gpio) |
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131 | { |
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132 | CHECK_ARG(dev); |
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133 | |
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134 | dev->i2c_dev.port = port; |
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135 | dev->i2c_dev.addr = SGP40_ADDR; |
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136 | dev->i2c_dev.cfg.sda_io_num = sda_gpio; |
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137 | dev->i2c_dev.cfg.scl_io_num = scl_gpio; |
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138 | #if HELPER_TARGET_IS_ESP32 |
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139 | dev->i2c_dev.cfg.master.clk_speed = I2C_FREQ_HZ; |
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140 | #endif |
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141 | return i2c_dev_create_mutex(&dev->i2c_dev); |
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142 | } |
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143 | |
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144 | esp_err_t sgp40_free_desc(sgp40_t *dev) |
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145 | { |
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146 | CHECK_ARG(dev); |
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147 | |
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148 | return i2c_dev_delete_mutex(&dev->i2c_dev); |
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149 | } |
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150 | |
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151 | esp_err_t sgp40_init(sgp40_t *dev) |
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152 | { |
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153 | CHECK_ARG(dev); |
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154 | |
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155 | CHECK(execute_cmd(dev, CMD_SERIAL, TIME_SERIAL, NULL, 0, dev->serial, 3)); |
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156 | CHECK(execute_cmd(dev, CMD_FEATURESET, TIME_FEATURESET, NULL, 0, &dev->featureset, 1)); |
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157 | |
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158 | ESP_LOGD(TAG, "Device found. S/N: 0x%04x%04x%04x, featureset 0x%04x", |
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159 | dev->serial[0], dev->serial[1], dev->serial[2], dev->featureset); |
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160 | |
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161 | VocAlgorithm_init(&dev->voc); |
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162 | |
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163 | return ESP_OK; |
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164 | } |
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165 | |
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166 | esp_err_t sgp40_soft_reset(sgp40_t *dev) |
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167 | { |
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168 | CHECK_ARG(dev); |
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169 | |
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170 | return execute_cmd(dev, CMD_SOFT_RESET, TIME_SOFT_RESET, NULL, 0, NULL, 0); |
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171 | } |
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172 | |
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173 | esp_err_t sgp40_self_test(sgp40_t *dev) |
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174 | { |
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175 | CHECK_ARG(dev); |
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176 | |
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177 | uint16_t res; |
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178 | CHECK(execute_cmd(dev, CMD_SELF_TEST, TIME_SELF_TEST, NULL, 0, &res, 1)); |
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179 | |
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180 | return res == SELF_TEST_OK ? ESP_OK : ESP_FAIL; |
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181 | } |
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182 | |
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183 | esp_err_t sgp40_heater_off(sgp40_t *dev) |
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184 | { |
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185 | CHECK_ARG(dev); |
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186 | |
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187 | return execute_cmd(dev, CMD_HEATER_OFF, TIME_HEATER_OFF, NULL, 0, NULL, 0); |
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188 | } |
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189 | |
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190 | esp_err_t sgp40_measure_raw(sgp40_t *dev, float humidity, float temperature, uint16_t *raw) |
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191 | { |
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192 | CHECK_ARG(dev && raw); |
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193 | |
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194 | uint16_t params[2]; |
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195 | if (isnan(humidity) || isnan(temperature)) |
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196 | { |
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197 | params[0] = 0x8000; |
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198 | params[1] = 0x6666; |
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199 | ESP_LOGW(TAG, "Uncompensated measurement"); |
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200 | } |
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201 | else |
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202 | { |
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203 | if (humidity < 0) |
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204 | humidity = 0; |
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205 | else if (humidity > 100) |
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206 | humidity = 100; |
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207 | |
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208 | if (temperature < -45) |
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209 | temperature = -45; |
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210 | else if (temperature > 129.76) |
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211 | temperature = 129.76; |
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212 | |
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213 | params[0] = (uint16_t)(humidity / 100.0 * 65536); |
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214 | params[1] = (uint16_t)((temperature + 45) / 175.0 * 65535); |
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215 | } |
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216 | |
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217 | return execute_cmd(dev, CMD_MEASURE_RAW, TIME_MEASURE_RAW, params, 2, raw, 1); |
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218 | } |
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219 | |
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220 | esp_err_t sgp40_measure_voc(sgp40_t *dev, float humidity, float temperature, int32_t *voc_index) |
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221 | { |
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222 | CHECK_ARG(dev && voc_index); |
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223 | |
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224 | uint16_t raw; |
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225 | CHECK(sgp40_measure_raw(dev, humidity, temperature, &raw)); |
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226 | VocAlgorithm_process(&dev->voc, raw, voc_index); |
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227 | |
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228 | return ESP_OK; |
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229 | } |