Sun, 16 Apr 2023 12:27:12 +0200
Preparations for BLE GATT. Added extra time after INA219 is powered on before measurement. Reduced LEDC frequency to 60 Hz, that makes the LED lights less nervous. Hardware mod on output 4, now needs external pulldown resistor.
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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.
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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
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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6 | * Copyright (c) 2020 Ruslan V. Uss <unclerus@gmail.com> |
1c9894662795
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7 | * |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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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.
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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.
Michiel Broek <mbroek@mbse.eu>
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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.
Michiel Broek <mbroek@mbse.eu>
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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
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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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.
Michiel Broek <mbroek@mbse.eu>
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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.
Michiel Broek <mbroek@mbse.eu>
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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.
Michiel Broek <mbroek@mbse.eu>
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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
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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49 | for (uint8_t bit = 8; bit > 0; --bit) |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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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
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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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
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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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
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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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
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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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
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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78 | |
1c9894662795
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79 | ESP_LOGV(TAG, "Sending buffer:"); |
1c9894662795
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80 | ESP_LOG_BUFFER_HEX_LEVEL(TAG, buf, sizeof(buf), ESP_LOG_VERBOSE); |
1c9894662795
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81 | |
1c9894662795
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82 | return i2c_dev_write(dev, NULL, 0, buf, sizeof(buf)); |
1c9894662795
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83 | } |
1c9894662795
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84 | |
1c9894662795
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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]; |
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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)) |
1c9894662795
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98 | { |
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99 | ESP_LOGE(TAG, "Invalid CRC 0x%02x, expected 0x%02x", crc, *(p + 2)); |
1c9894662795
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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; |
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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 | } |