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) 2020 Erriez <https://github.com/Erriez> |
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 | * Copyright (c) 2021 David Douard <david.douard@sdfa3.org> |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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4 | * |
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 | * Redistribution and use in source and binary forms, with or without |
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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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.
Michiel Broek <mbroek@mbse.eu>
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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>
parents:
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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>
parents:
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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.
Michiel Broek <mbroek@mbse.eu>
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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.
Michiel Broek <mbroek@mbse.eu>
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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.
Michiel Broek <mbroek@mbse.eu>
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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.
Michiel Broek <mbroek@mbse.eu>
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15 | * specific prior written permission. |
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 | * |
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 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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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
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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20 | * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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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.
Michiel Broek <mbroek@mbse.eu>
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23 | * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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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
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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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 mhz19b.c |
1c9894662795
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31 | * |
1c9894662795
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32 | * ESP-IDF driver for MH-Z19B NDIR CO2 sensor connected to UART |
1c9894662795
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33 | * |
1c9894662795
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34 | * Inspired from https://github.com/Erriez/ErriezMHZ19B |
1c9894662795
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35 | * |
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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36 | * Copyright (c) 2020 Erriez <https://github.com/Erriez> |
1c9894662795
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37 | * Copyright (c) 2021 David Douard <david.douard@sdfa3.org> |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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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 | #include <string.h> |
1c9894662795
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42 | #include <esp_idf_lib_helpers.h> |
1c9894662795
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43 | #include <esp_log.h> |
1c9894662795
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44 | #include <esp_timer.h> |
1c9894662795
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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 | #include "mhz19b.h" |
1c9894662795
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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 | static const char *TAG = "mhz19b"; |
1c9894662795
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49 | |
1c9894662795
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50 | #define CHECK(x) do { esp_err_t __; if ((__ = x) != ESP_OK) return __; } while (0) |
1c9894662795
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51 | #define CHECK_ARG(VAL) do { if (!(VAL)) 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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52 | |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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53 | esp_err_t mhz19b_init(mhz19b_dev_t *dev, uart_port_t uart_port, gpio_num_t tx_gpio, gpio_num_t rx_gpio) |
1c9894662795
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54 | { |
1c9894662795
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55 | CHECK_ARG(dev); |
1c9894662795
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56 | |
1c9894662795
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57 | uart_config_t uart_config = { |
1c9894662795
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58 | .baud_rate = 9600, |
1c9894662795
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59 | .data_bits = UART_DATA_8_BITS, |
1c9894662795
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60 | .parity = UART_PARITY_DISABLE, |
1c9894662795
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61 | .stop_bits = UART_STOP_BITS_1, |
1c9894662795
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62 | .flow_ctrl = UART_HW_FLOWCTRL_DISABLE, |
1c9894662795
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63 | #if ESP_IDF_VERSION >= ESP_IDF_VERSION_VAL(4, 3, 0) |
1c9894662795
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64 | .source_clk = UART_SCLK_APB, |
1c9894662795
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65 | #endif |
1c9894662795
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66 | }; |
1c9894662795
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67 | CHECK(uart_driver_install(uart_port, MHZ19B_SERIAL_BUF_LEN * 2, 0, 0, NULL, 0)); |
1c9894662795
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68 | CHECK(uart_param_config(uart_port, &uart_config)); |
1c9894662795
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69 | #if HELPER_TARGET_IS_ESP32 |
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70 | CHECK(uart_set_pin(uart_port, tx_gpio, rx_gpio, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE)); |
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71 | #endif |
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72 | |
1c9894662795
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73 | dev->uart_port = uart_port; |
1c9894662795
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74 | // buffer for the incoming data |
1c9894662795
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75 | dev->buf = malloc(MHZ19B_SERIAL_BUF_LEN); |
1c9894662795
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76 | if (!dev->buf) |
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77 | return ESP_ERR_NO_MEM; |
1c9894662795
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78 | dev->last_value = -1; |
1c9894662795
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79 | dev->last_ts = esp_timer_get_time(); |
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80 | return ESP_OK; |
1c9894662795
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81 | } |
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82 | |
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83 | esp_err_t mhz19b_free(mhz19b_dev_t *dev) |
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84 | { |
1c9894662795
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85 | CHECK_ARG(dev && dev->buf); |
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86 | |
1c9894662795
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87 | free(dev->buf); |
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88 | dev->buf = NULL; |
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89 | return ESP_OK; |
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90 | } |
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91 | |
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92 | bool mhz19b_detect(mhz19b_dev_t *dev) |
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93 | { |
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94 | CHECK_ARG(dev); |
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95 | |
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96 | uint16_t range; |
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97 | // Check valid PPM range |
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98 | if ((mhz19b_get_range(dev, &range) == ESP_OK) && (range > 0)) |
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99 | return true; |
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100 | |
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101 | // Sensor not detected, or invalid range returned |
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102 | // Try recover by calling setRange(MHZ19B_RANGE_5000); |
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103 | return false; |
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104 | } |
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105 | |
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106 | bool mhz19b_is_warming_up(mhz19b_dev_t *dev, bool smart_warming_up) |
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107 | { |
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108 | CHECK_ARG(dev); |
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109 | |
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110 | // Wait at least 3 minutes after power-on |
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111 | if (esp_timer_get_time() < MHZ19B_WARMING_UP_TIME_US) |
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112 | { |
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113 | if (smart_warming_up) |
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114 | { |
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115 | ESP_LOGD(TAG, "Using smart warming up detection"); |
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116 | |
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117 | int16_t co2, last_co2; |
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118 | last_co2 = dev->last_value; |
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119 | // Sensor returns valid data after CPU reset and keep sensor powered |
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120 | if (mhz19b_read_co2(dev, &co2) != ESP_OK) |
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121 | return false; |
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122 | if ((last_co2 != -1) && (last_co2 != co2)) |
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123 | // CO2 value changed since last read, no longer warming-up |
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124 | return false; |
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125 | } |
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126 | // Warming-up |
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127 | return true; |
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128 | } |
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129 | |
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130 | // Not warming-up |
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131 | return false; |
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132 | } |
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133 | |
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134 | bool mhz19b_is_ready(mhz19b_dev_t *dev) |
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135 | { |
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136 | if (!dev) return false; |
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137 | |
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138 | // Minimum CO2 read interval (Built-in LED flashes) |
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139 | if ((esp_timer_get_time() - dev->last_ts) > MHZ19B_READ_INTERVAL_MS) { |
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140 | return true; |
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141 | } |
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142 | |
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143 | return false; |
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144 | } |
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145 | |
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146 | esp_err_t mhz19b_read_co2(mhz19b_dev_t *dev, int16_t *co2) |
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147 | { |
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148 | CHECK_ARG(dev && co2); |
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149 | |
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150 | // Send command "Read CO2 concentration" |
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151 | CHECK(mhz19b_send_command(dev, MHZ19B_CMD_READ_CO2, 0, 0, 0, 0, 0)); |
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152 | |
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153 | // 16-bit CO2 value in response Bytes 2 and 3 |
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154 | *co2 = (dev->buf[2] << 8) | dev->buf[3]; |
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155 | dev->last_ts = esp_timer_get_time(); |
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156 | dev->last_value = *co2; |
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157 | |
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158 | return ESP_OK; |
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159 | } |
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160 | |
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161 | esp_err_t mhz19b_get_version(mhz19b_dev_t *dev, char *version) |
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162 | { |
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163 | CHECK_ARG(dev && version); |
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164 | |
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165 | // Clear version |
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166 | memset(version, 0, 5); |
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167 | |
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168 | // Send command "Read firmware version" (NOT DOCUMENTED) |
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169 | CHECK(mhz19b_send_command(dev, MHZ19B_CMD_GET_VERSION, 0, 0, 0, 0, 0)); |
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170 | |
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171 | // Copy 4 ASCII characters to version array like "0443" |
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172 | for (uint8_t i = 0; i < 4; i++) { |
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173 | // Version in response Bytes 2..5 |
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174 | version[i] = dev->buf[i + 2]; |
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175 | } |
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176 | |
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177 | return ESP_OK; |
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178 | } |
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179 | |
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180 | esp_err_t mhz19b_set_range(mhz19b_dev_t *dev, mhz19b_range_t range) |
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181 | { |
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182 | CHECK_ARG(dev); |
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183 | |
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184 | // Send "Set range" command |
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185 | return mhz19b_send_command(dev, MHZ19B_CMD_SET_RANGE, |
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186 | 0x00, 0x00, 0x00, (range >> 8), (range & 0xff)); |
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187 | } |
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188 | |
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189 | esp_err_t mhz19b_get_range(mhz19b_dev_t *dev, uint16_t *range) |
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190 | { |
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191 | CHECK_ARG(dev && range); |
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192 | |
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193 | // Send command "Read range" (NOT DOCUMENTED) |
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194 | CHECK(mhz19b_send_command(dev, MHZ19B_CMD_GET_RANGE, 0, 0, 0, 0, 0)); |
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195 | |
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196 | // Range is in Bytes 4 and 5 |
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197 | *range = (dev->buf[4] << 8) | dev->buf[5]; |
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198 | |
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199 | // Check range according to documented specification |
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200 | if ((*range != MHZ19B_RANGE_2000) && (*range != MHZ19B_RANGE_5000)) |
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201 | return ESP_ERR_INVALID_RESPONSE; |
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202 | |
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203 | return ESP_OK; |
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204 | } |
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205 | |
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206 | esp_err_t mhz19b_set_auto_calibration(mhz19b_dev_t *dev, bool calibration_on) |
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207 | { |
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208 | CHECK_ARG(dev); |
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209 | |
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210 | // Send command "Set Automatic Baseline Correction (ABC logic function)" |
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211 | return mhz19b_send_command(dev, MHZ19B_CMD_SET_AUTO_CAL, (calibration_on ? 0xA0 : 0x00), 0, 0, 0, 0); |
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212 | } |
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213 | |
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214 | esp_err_t mhz19b_get_auto_calibration(mhz19b_dev_t *dev, bool *calibration_on) |
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215 | { |
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216 | CHECK_ARG(dev && calibration_on); |
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217 | |
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218 | // Send command "Get Automatic Baseline Correction (ABC logic function)" (NOT DOCUMENTED) |
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219 | CHECK(mhz19b_send_command(dev, MHZ19B_CMD_GET_AUTO_CAL, 0, 0, 0, 0, 0)); |
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220 | |
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221 | // Response is located in Byte 7: 0 = off, 1 = on |
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222 | *calibration_on = dev->buf[7] & 0x01; |
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223 | |
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224 | return ESP_OK; |
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225 | } |
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226 | |
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227 | esp_err_t mhz19b_start_calibration(mhz19b_dev_t *dev) |
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228 | { |
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229 | CHECK_ARG(dev); |
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230 | |
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231 | // Send command "Zero Point Calibration" |
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232 | return mhz19b_send_command(dev, MHZ19B_CMD_CAL_ZERO_POINT, 0, 0, 0, 0, 0); |
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233 | } |
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234 | |
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235 | esp_err_t mhz19b_send_command(mhz19b_dev_t *dev, uint8_t cmd, uint8_t b3, uint8_t b4, uint8_t b5, uint8_t b6, uint8_t b7) |
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236 | { |
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237 | CHECK_ARG(dev && dev->buf); |
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238 | |
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239 | uint8_t txBuffer[MHZ19B_SERIAL_RX_BYTES] = { 0xFF, 0x01, cmd, b3, b4, b5, b6, b7, 0x00 }; |
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240 | |
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241 | // Check initialized |
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242 | #if HELPER_TARGET_IS_ESP32 && ESP_IDF_VERSION >= ESP_IDF_VERSION_VAL(4, 0, 0) |
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243 | if (!uart_is_driver_installed(dev->uart_port)) |
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244 | return ESP_ERR_INVALID_STATE; |
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245 | #endif |
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246 | |
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247 | // Add CRC Byte |
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248 | txBuffer[8] = mhz19b_calc_crc(txBuffer); |
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249 | |
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250 | // Clear receive buffer |
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251 | uart_flush(dev->uart_port); |
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252 | |
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253 | // Write serial data |
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254 | uart_write_bytes(dev->uart_port, (char *) txBuffer, sizeof(txBuffer)); |
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255 | |
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256 | // Clear receive buffer |
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257 | memset(dev->buf, 0, MHZ19B_SERIAL_BUF_LEN); |
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258 | |
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259 | // Read response from serial buffer |
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260 | int len = uart_read_bytes(dev->uart_port, dev->buf, |
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261 | MHZ19B_SERIAL_RX_BYTES, |
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262 | MHZ19B_SERIAL_RX_TIMEOUT_MS / portTICK_PERIOD_MS); |
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263 | if (len < 9) |
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264 | return ESP_ERR_TIMEOUT; |
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265 | |
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266 | // Check received Byte[0] == 0xFF and Byte[1] == transmit command |
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267 | if ((dev->buf[0] != 0xFF) || (dev->buf[1] != cmd)) |
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268 | return ESP_ERR_INVALID_RESPONSE; |
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269 | |
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270 | // Check received Byte[8] CRC |
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271 | if (dev->buf[8] != mhz19b_calc_crc(dev->buf)) |
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272 | return ESP_ERR_INVALID_CRC; |
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273 | |
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274 | // Return result |
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275 | return ESP_OK; |
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276 | } |
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277 | |
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278 | // ---------------------------------------------------------------------------- |
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279 | // Private functions |
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280 | // ---------------------------------------------------------------------------- |
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281 | |
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282 | uint8_t mhz19b_calc_crc(uint8_t *data) |
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283 | { |
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284 | uint8_t crc = 0; |
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285 | |
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286 | // Calculate CRC on 8 data Bytes |
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287 | for (uint8_t i = 1; i < 8; i++) |
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288 | crc += data[i]; |
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289 | |
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290 | crc = 0xFF - crc; |
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291 | crc++; |
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292 | |
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293 | // Return calculated CRC |
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294 | return crc; |
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295 | } |