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.
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 | * Copyright (c) 2016 Jonathan Hartsuiker <https://github.com/jsuiker> |
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) 2018 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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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
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.
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parents:
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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.
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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
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.
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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 dht.c |
1c9894662795
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31 | * |
1c9894662795
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32 | * ESP-IDF driver for DHT11, AM2301 (DHT21, DHT22, AM2302, AM2321), Itead Si7021 |
1c9894662795
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33 | * |
1c9894662795
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34 | * Ported from esp-open-rtos |
1c9894662795
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35 | * |
1c9894662795
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36 | * Copyright (c) 2016 Jonathan Hartsuiker <https://github.com/jsuiker>\n |
1c9894662795
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37 | * Copyright (c) 2018 Ruslan V. Uss <unclerus@gmail.com>\n |
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 | #include "dht.h" |
1c9894662795
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42 | |
1c9894662795
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43 | #include <freertos/FreeRTOS.h> |
1c9894662795
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44 | #include <string.h> |
1c9894662795
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45 | #include <esp_log.h> |
1c9894662795
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46 | #include <ets_sys.h> |
1c9894662795
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47 | #include <esp_idf_lib_helpers.h> |
1c9894662795
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48 | |
1c9894662795
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49 | // DHT timer precision in microseconds |
1c9894662795
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50 | #define DHT_TIMER_INTERVAL 2 |
1c9894662795
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51 | #define DHT_DATA_BITS 40 |
1c9894662795
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52 | #define DHT_DATA_BYTES (DHT_DATA_BITS / 8) |
1c9894662795
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53 | |
1c9894662795
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54 | /* |
1c9894662795
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55 | * Note: |
1c9894662795
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56 | * A suitable pull-up resistor should be connected to the selected GPIO line |
1c9894662795
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57 | * |
1c9894662795
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58 | * __ ______ _______ ___________________________ |
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59 | * \ A / \ C / \ DHT duration_data_low / \ |
1c9894662795
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60 | * \_______/ B \______/ D \__________________________/ DHT duration_data_high \__ |
1c9894662795
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61 | * |
1c9894662795
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62 | * |
1c9894662795
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63 | * Initializing communications with the DHT requires four 'phases' as follows: |
1c9894662795
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64 | * |
1c9894662795
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65 | * Phase A - MCU pulls signal low for at least 18000 us |
1c9894662795
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66 | * Phase B - MCU allows signal to float back up and waits 20-40us for DHT to pull it low |
1c9894662795
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67 | * Phase C - DHT pulls signal low for ~80us |
1c9894662795
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68 | * Phase D - DHT lets signal float back up for ~80us |
1c9894662795
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69 | * |
1c9894662795
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70 | * After this, the DHT transmits its first bit by holding the signal low for 50us |
1c9894662795
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71 | * and then letting it float back high for a period of time that depends on the data bit. |
1c9894662795
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72 | * duration_data_high is shorter than 50us for a logic '0' and longer than 50us for logic '1'. |
1c9894662795
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73 | * |
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74 | * There are a total of 40 data bits transmitted sequentially. These bits are read into a byte array |
1c9894662795
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75 | * of length 5. The first and third bytes are humidity (%) and temperature (C), respectively. Bytes 2 and 4 |
1c9894662795
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76 | * are zero-filled and the fifth is a checksum such that: |
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77 | * |
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78 | * byte_5 == (byte_1 + byte_2 + byte_3 + byte_4) & 0xFF |
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79 | * |
1c9894662795
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80 | */ |
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81 | |
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82 | static const char *TAG = "dht"; |
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83 | |
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84 | #if HELPER_TARGET_IS_ESP32 |
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85 | static portMUX_TYPE mux = portMUX_INITIALIZER_UNLOCKED; |
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86 | #define PORT_ENTER_CRITICAL() portENTER_CRITICAL(&mux) |
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87 | #define PORT_EXIT_CRITICAL() portEXIT_CRITICAL(&mux) |
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88 | |
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89 | #elif HELPER_TARGET_IS_ESP8266 |
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90 | #define PORT_ENTER_CRITICAL() portENTER_CRITICAL() |
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91 | #define PORT_EXIT_CRITICAL() portEXIT_CRITICAL() |
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92 | #endif |
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93 | |
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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 CHECK_LOGE(x, msg, ...) do { \ |
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97 | esp_err_t __; \ |
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98 | if ((__ = x) != ESP_OK) { \ |
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99 | PORT_EXIT_CRITICAL(); \ |
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100 | ESP_LOGE(TAG, msg, ## __VA_ARGS__); \ |
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101 | return __; \ |
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102 | } \ |
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103 | } while (0) |
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104 | |
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105 | |
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106 | /** |
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107 | * Wait specified time for pin to go to a specified state. |
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108 | * If timeout is reached and pin doesn't go to a requested state |
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109 | * false is returned. |
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110 | * The elapsed time is returned in pointer 'duration' if it is not NULL. |
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111 | */ |
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112 | static esp_err_t dht_await_pin_state(gpio_num_t pin, uint32_t timeout, |
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113 | int expected_pin_state, uint32_t *duration) |
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114 | { |
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115 | /* XXX dht_await_pin_state() should save pin direction and restore |
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116 | * the direction before return. however, the SDK does not provide |
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117 | * gpio_get_direction(). |
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118 | */ |
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119 | gpio_set_direction(pin, GPIO_MODE_INPUT); |
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120 | for (uint32_t i = 0; i < timeout; i += DHT_TIMER_INTERVAL) |
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121 | { |
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122 | // need to wait at least a single interval to prevent reading a jitter |
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123 | ets_delay_us(DHT_TIMER_INTERVAL); |
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124 | if (gpio_get_level(pin) == expected_pin_state) |
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125 | { |
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126 | if (duration) |
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127 | *duration = i; |
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128 | return ESP_OK; |
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129 | } |
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130 | } |
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131 | |
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132 | return ESP_ERR_TIMEOUT; |
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133 | } |
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134 | |
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135 | /** |
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136 | * Request data from DHT and read raw bit stream. |
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137 | * The function call should be protected from task switching. |
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138 | * Return false if error occurred. |
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139 | */ |
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140 | static inline esp_err_t dht_fetch_data(dht_sensor_type_t sensor_type, gpio_num_t pin, uint8_t data[DHT_DATA_BYTES]) |
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141 | { |
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142 | uint32_t low_duration; |
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143 | uint32_t high_duration; |
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144 | |
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145 | // Phase 'A' pulling signal low to initiate read sequence |
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146 | gpio_set_direction(pin, GPIO_MODE_OUTPUT_OD); |
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147 | gpio_set_level(pin, 0); |
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148 | ets_delay_us(sensor_type == DHT_TYPE_SI7021 ? 500 : 20000); |
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149 | gpio_set_level(pin, 1); |
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150 | |
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151 | // Step through Phase 'B', 40us |
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152 | CHECK_LOGE(dht_await_pin_state(pin, 40, 0, NULL), |
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153 | "Initialization error, problem in phase 'B'"); |
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154 | // Step through Phase 'C', 88us |
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155 | CHECK_LOGE(dht_await_pin_state(pin, 88, 1, NULL), |
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156 | "Initialization error, problem in phase 'C'"); |
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157 | // Step through Phase 'D', 88us |
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158 | CHECK_LOGE(dht_await_pin_state(pin, 88, 0, NULL), |
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159 | "Initialization error, problem in phase 'D'"); |
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160 | |
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161 | // Read in each of the 40 bits of data... |
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162 | for (int i = 0; i < DHT_DATA_BITS; i++) |
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163 | { |
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164 | CHECK_LOGE(dht_await_pin_state(pin, 65, 1, &low_duration), |
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165 | "LOW bit timeout"); |
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166 | CHECK_LOGE(dht_await_pin_state(pin, 75, 0, &high_duration), |
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167 | "HIGH bit timeout"); |
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168 | |
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169 | uint8_t b = i / 8; |
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170 | uint8_t m = i % 8; |
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171 | if (!m) |
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172 | data[b] = 0; |
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173 | |
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174 | data[b] |= (high_duration > low_duration) << (7 - m); |
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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 | /** |
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181 | * Pack two data bytes into single value and take into account sign bit. |
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182 | */ |
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183 | static inline int16_t dht_convert_data(dht_sensor_type_t sensor_type, uint8_t msb, uint8_t lsb) |
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184 | { |
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185 | int16_t data; |
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186 | |
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187 | if (sensor_type == DHT_TYPE_DHT11) |
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188 | { |
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189 | data = msb * 10; |
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190 | } |
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191 | else |
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192 | { |
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193 | data = msb & 0x7F; |
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194 | data <<= 8; |
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195 | data |= lsb; |
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196 | if (msb & BIT(7)) |
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197 | data = -data; // convert it to negative |
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198 | } |
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199 | |
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200 | return data; |
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201 | } |
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202 | |
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203 | esp_err_t dht_read_data(dht_sensor_type_t sensor_type, gpio_num_t pin, |
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204 | int16_t *humidity, int16_t *temperature) |
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205 | { |
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206 | CHECK_ARG(humidity || temperature); |
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207 | |
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208 | uint8_t data[DHT_DATA_BYTES] = { 0 }; |
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209 | |
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210 | gpio_set_direction(pin, GPIO_MODE_OUTPUT_OD); |
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211 | gpio_set_level(pin, 1); |
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212 | |
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213 | PORT_ENTER_CRITICAL(); |
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214 | esp_err_t result = dht_fetch_data(sensor_type, pin, data); |
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215 | if (result == ESP_OK) |
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216 | PORT_EXIT_CRITICAL(); |
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217 | |
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218 | /* restore GPIO direction because, after calling dht_fetch_data(), the |
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219 | * GPIO direction mode changes */ |
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220 | gpio_set_direction(pin, GPIO_MODE_OUTPUT_OD); |
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221 | gpio_set_level(pin, 1); |
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222 | |
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223 | if (result != ESP_OK) |
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224 | return result; |
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225 | |
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226 | if (data[4] != ((data[0] + data[1] + data[2] + data[3]) & 0xFF)) |
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227 | { |
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228 | ESP_LOGE(TAG, "Checksum failed, invalid data received from sensor"); |
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229 | return ESP_ERR_INVALID_CRC; |
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230 | } |
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231 | |
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232 | if (humidity) |
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233 | *humidity = dht_convert_data(sensor_type, data[0], data[1]); |
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234 | if (temperature) |
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235 | *temperature = dht_convert_data(sensor_type, data[2], data[3]); |
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236 | |
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237 | ESP_LOGD(TAG, "Sensor data: humidity=%d, temp=%d", *humidity, *temperature); |
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238 | |
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239 | return ESP_OK; |
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240 | } |
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241 | |
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242 | esp_err_t dht_read_float_data(dht_sensor_type_t sensor_type, gpio_num_t pin, |
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243 | float *humidity, float *temperature) |
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244 | { |
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245 | CHECK_ARG(humidity || temperature); |
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246 | |
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247 | int16_t i_humidity, i_temp; |
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248 | |
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249 | esp_err_t res = dht_read_data(sensor_type, pin, humidity ? &i_humidity : NULL, temperature ? &i_temp : NULL); |
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250 | if (res != ESP_OK) |
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251 | return res; |
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252 | |
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253 | if (humidity) |
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254 | *humidity = i_humidity / 10.0; |
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255 | if (temperature) |
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256 | *temperature = i_temp / 10.0; |
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257 | |
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258 | return ESP_OK; |
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259 | } |