Mon, 17 Apr 2023 16:20:58 +0200
Version 0.4.1 Measure internal chip temperature, range -10 to 80. Result available in mqtt json payload.
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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.
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2 | * Copyright (c) 2016 Bernhard Guillon <Bernhard.Guillon@begu.org> |
1c9894662795
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3 | * Copyright (c) 2018 Ruslan V. Uss <unclerus@gmail.com> |
1c9894662795
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4 | * |
1c9894662795
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5 | * Redistribution and use in source and binary forms, with or without |
1c9894662795
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6 | * modification, are permitted provided that the following conditions are met: |
1c9894662795
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7 | * |
1c9894662795
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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.
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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.
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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.
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11 | * this list of conditions and the following disclaimer in the documentation |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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12 | * and/or other materials provided with the distribution. |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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13 | * 3. Neither the name of the copyright holder nor the names of itscontributors |
1c9894662795
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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
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17 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
1c9894662795
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18 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
1c9894662795
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20 | * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE |
1c9894662795
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21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
1c9894662795
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22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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23 | * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
1c9894662795
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24 | * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
1c9894662795
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25 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
1c9894662795
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26 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
1c9894662795
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27 | */ |
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28 | |
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29 | /** |
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30 | * @file ms5611.c |
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31 | * |
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32 | * ESP-IDF driver for barometric pressure sensor MS5611-01BA03 |
1c9894662795
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33 | * |
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34 | * Ported from esp-open-rtos |
1c9894662795
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35 | * |
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36 | * Copyright (c) 2016 Bernhard Guillon <Bernhard.Guillon@begu.org>\n |
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37 | * Copyright (c) 2018 Ruslan V. Uss <unclerus@gmail.com> |
1c9894662795
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38 | * |
1c9894662795
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39 | * BSD Licensed as described in the file LICENSE |
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40 | */ |
1c9894662795
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41 | |
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42 | #include <esp_idf_lib_helpers.h> |
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43 | #include "ms5611.h" |
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44 | |
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45 | #include <stddef.h> |
1c9894662795
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46 | #include <esp_system.h> |
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47 | #include <esp_log.h> |
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48 | #include <freertos/FreeRTOS.h> |
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49 | #include <freertos/task.h> |
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50 | #include <ets_sys.h> |
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51 | |
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52 | #define I2C_FREQ_HZ 400000 // 400 kHz |
1c9894662795
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53 | |
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54 | #define CMD_CONVERT_D1 0x40 |
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55 | #define CMD_CONVERT_D2 0x50 |
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56 | #define CMD_ADC_READ 0x00 |
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57 | #define CMD_RESET 0x1E |
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58 | |
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59 | #define PROM_ADDR_SENS 0xa2 |
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60 | #define PROM_ADDR_OFF 0xa4 |
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61 | #define PROM_ADDR_TCS 0xa6 |
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62 | #define PROM_ADDR_TCO 0xa8 |
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63 | #define PROM_ADDR_T_REF 0xaa |
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64 | #define PROM_ADDR_TEMPSENS 0xac |
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65 | |
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66 | #define CHECK(x) do { esp_err_t __; if ((__ = x) != ESP_OK) return __; } while (0) |
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67 | #define CHECK_ARG(VAL) do { if (!(VAL)) return ESP_ERR_INVALID_ARG; } while (0) |
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68 | |
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69 | static const char *TAG = "ms5611"; |
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70 | |
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71 | static inline esp_err_t send_command(ms5611_t *dev, uint8_t cmd) |
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72 | { |
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73 | return i2c_dev_write(&dev->i2c_dev, NULL, 0, &cmd, 1); |
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74 | } |
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75 | |
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76 | static inline uint16_t shuffle(uint16_t val) |
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77 | { |
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78 | return ((val & 0xff00) >> 8) | ((val & 0xff) << 8); |
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79 | } |
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80 | |
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81 | static inline esp_err_t read_prom(ms5611_t *dev) |
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82 | { |
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83 | uint16_t tmp; |
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84 | |
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85 | // FIXME calculate CRC (AN502) |
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86 | |
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87 | CHECK(i2c_dev_read_reg(&dev->i2c_dev, PROM_ADDR_SENS, &tmp, 2)); |
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88 | dev->config_data.sens = shuffle(tmp); |
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89 | CHECK(i2c_dev_read_reg(&dev->i2c_dev, PROM_ADDR_OFF, &tmp, 2)); |
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90 | dev->config_data.off = shuffle(tmp); |
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91 | CHECK(i2c_dev_read_reg(&dev->i2c_dev, PROM_ADDR_TCS, &tmp, 2)); |
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92 | dev->config_data.tcs = shuffle(tmp); |
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93 | CHECK(i2c_dev_read_reg(&dev->i2c_dev, PROM_ADDR_TCO, &tmp, 2)); |
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94 | dev->config_data.tco = shuffle(tmp); |
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95 | CHECK(i2c_dev_read_reg(&dev->i2c_dev, PROM_ADDR_T_REF, &tmp, 2)); |
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96 | dev->config_data.t_ref = shuffle(tmp); |
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97 | CHECK(i2c_dev_read_reg(&dev->i2c_dev, PROM_ADDR_TEMPSENS, &tmp, 2)); |
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98 | dev->config_data.tempsens = shuffle(tmp); |
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99 | |
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100 | return ESP_OK; |
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101 | } |
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102 | |
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103 | static esp_err_t read_adc(ms5611_t *dev, uint32_t *result) |
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104 | { |
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105 | uint8_t tmp[3]; |
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106 | |
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107 | CHECK(i2c_dev_read_reg(&dev->i2c_dev, 0, tmp, 3)); |
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108 | *result = (tmp[0] << 16) | (tmp[1] << 8) | tmp[2]; |
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109 | |
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110 | // If we are to fast the ADC will return 0 instead of the actual result |
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111 | return *result == 0 ? ESP_ERR_INVALID_RESPONSE : ESP_OK; |
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112 | } |
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113 | |
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114 | static void wait_conversion(ms5611_t *dev) |
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115 | { |
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116 | uint32_t us = 8220; |
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117 | switch (dev->osr) |
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118 | { |
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119 | case MS5611_OSR_256: us = 500; break; // 0.5ms |
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120 | case MS5611_OSR_512: us = 1100; break; // 1.1ms |
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121 | case MS5611_OSR_1024: us = 2100; break; // 2.1ms |
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122 | case MS5611_OSR_2048: us = 4100; break; // 4.1ms |
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123 | case MS5611_OSR_4096: us = 8220; break; // 8.22ms |
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124 | } |
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125 | ets_delay_us(us); |
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126 | } |
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127 | |
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128 | static inline esp_err_t get_raw_temperature(ms5611_t *dev, uint32_t *result) |
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129 | { |
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130 | CHECK(send_command(dev, CMD_CONVERT_D2 + dev->osr)); |
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131 | wait_conversion(dev); |
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132 | CHECK(read_adc(dev, result)); |
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133 | |
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134 | return ESP_OK; |
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135 | } |
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136 | |
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137 | static inline esp_err_t get_raw_pressure(ms5611_t *dev, uint32_t *result) |
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138 | { |
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139 | CHECK(send_command(dev, CMD_CONVERT_D1 + dev->osr)); |
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140 | wait_conversion(dev); |
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141 | CHECK(read_adc(dev, result)); |
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142 | |
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143 | return ESP_OK; |
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144 | } |
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145 | |
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146 | static esp_err_t ms5611_reset(ms5611_t *dev) |
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147 | { |
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148 | I2C_DEV_TAKE_MUTEX(&dev->i2c_dev); |
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149 | I2C_DEV_CHECK(&dev->i2c_dev, send_command(dev, CMD_RESET)); |
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150 | I2C_DEV_GIVE_MUTEX(&dev->i2c_dev); |
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151 | |
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152 | return ESP_OK; |
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153 | } |
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154 | |
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155 | /////////////////////////Public////////////////////////////////////// |
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156 | |
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157 | esp_err_t ms5611_init_desc(ms5611_t *dev, uint8_t addr, i2c_port_t port, gpio_num_t sda_gpio, gpio_num_t scl_gpio) |
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158 | { |
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159 | CHECK_ARG(dev); |
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160 | |
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161 | if (addr != MS5611_ADDR_CSB_HIGH && addr != MS5611_ADDR_CSB_LOW) |
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162 | { |
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163 | ESP_LOGE(TAG, "Invalid I2C address 0x%02x", addr); |
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164 | return ESP_ERR_INVALID_ARG; |
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165 | } |
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166 | |
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167 | dev->i2c_dev.port = port; |
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168 | dev->i2c_dev.addr = addr; |
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169 | dev->i2c_dev.cfg.sda_io_num = sda_gpio; |
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170 | dev->i2c_dev.cfg.scl_io_num = scl_gpio; |
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171 | #if HELPER_TARGET_IS_ESP32 |
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172 | dev->i2c_dev.cfg.master.clk_speed = I2C_FREQ_HZ; |
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173 | #endif |
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174 | |
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175 | return i2c_dev_create_mutex(&dev->i2c_dev); |
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176 | } |
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177 | |
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178 | esp_err_t ms5611_free_desc(ms5611_t *dev) |
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179 | { |
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180 | CHECK_ARG(dev); |
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181 | |
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182 | return i2c_dev_delete_mutex(&dev->i2c_dev); |
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183 | } |
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184 | |
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185 | esp_err_t ms5611_init(ms5611_t *dev, ms5611_osr_t osr) |
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186 | { |
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187 | CHECK_ARG(dev); |
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188 | |
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189 | dev->osr = osr; |
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190 | |
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191 | // First of all we need to reset the chip |
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192 | CHECK(ms5611_reset(dev)); |
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193 | // Wait a bit for the device to reset |
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194 | vTaskDelay(pdMS_TO_TICKS(10)); |
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195 | // Get the config |
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196 | CHECK(read_prom(dev)); |
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197 | |
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198 | return ESP_OK; |
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199 | } |
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200 | |
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201 | esp_err_t ms5611_get_sensor_data(ms5611_t *dev, int32_t *pressure, float *temperature) |
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202 | { |
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203 | CHECK_ARG(dev && pressure && temperature); |
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204 | |
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205 | // Second order temperature compensation see datasheet p8 |
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206 | uint32_t raw_pressure = 0; |
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207 | uint32_t raw_temperature = 0; |
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208 | |
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209 | I2C_DEV_TAKE_MUTEX(&dev->i2c_dev); |
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210 | I2C_DEV_CHECK(&dev->i2c_dev, get_raw_pressure(dev, &raw_pressure)); |
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211 | I2C_DEV_CHECK(&dev->i2c_dev, get_raw_temperature(dev, &raw_temperature)); |
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212 | I2C_DEV_GIVE_MUTEX(&dev->i2c_dev); |
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213 | |
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214 | // dT = D2 - T_ref = D2 - C5 * 2^8 |
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215 | int32_t dt = raw_temperature - ((int32_t)dev->config_data.t_ref << 8); |
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216 | // Actual temperature (-40...85C with 0.01 resolution) |
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217 | // TEMP = 20C +dT * TEMPSENSE =2000 + dT * C6 / 2^23 |
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218 | int64_t temp = (2000 + (int64_t)dt * dev->config_data.tempsens / 8388608); |
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219 | // Offset at actual temperature |
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220 | // OFF=OFF_t1 + TCO * dT = OFF_t1(C2) * 2^16 + (C4*dT)/2^7 |
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221 | int64_t off = (int64_t)((int64_t)dev->config_data.off * 65536) |
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222 | + (((int64_t)dev->config_data.tco * dt) / 128); |
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223 | // Sensitivity at actual temperature |
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224 | // SENS=SENS_t1 + TCS *dT = SENS_t1(C1) *2^15 + (TCS(C3) *dT)/2^8 |
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225 | int64_t sens = (int64_t)(((int64_t)dev->config_data.sens) * 32768) |
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226 | + (((int64_t)dev->config_data.tcs * dt) / 256); |
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227 | |
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228 | // Set defaults for temp >= 2000 |
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229 | int64_t t_2 = 0; |
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230 | int64_t off_2 = 0; |
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231 | int64_t sens_2 = 0; |
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232 | int64_t help = 0; |
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233 | if (temp < 2000) |
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234 | { |
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235 | // Low temperature |
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236 | t_2 = ((dt * dt) >> 31); // T2 = dT^2/2^31 |
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237 | help = (temp - 2000); |
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238 | help = 5 * help * help; |
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239 | off_2 = help >> 1; // OFF_2 = 5 * (TEMP - 2000)^2/2^1 |
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240 | sens_2 = help >> 2; // SENS_2 = 5 * (TEMP - 2000)^2/2^2 |
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241 | if (temp < -1500) |
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242 | { |
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243 | // Very low temperature |
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244 | help = (temp + 1500); |
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245 | help = help * help; |
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246 | off_2 = off_2 + 7 * help; // OFF_2 = OFF_2 + 7 * (TEMP + 1500)^2 |
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247 | sens_2 = sens_2 + ((11 * help) >> 1); // SENS_2 = SENS_2 + 7 * (TEMP + 1500)^2/2^1 |
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248 | } |
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249 | } |
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250 | |
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251 | temp = temp - t_2; |
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252 | off = off - off_2; |
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253 | sens = sens - sens_2; |
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254 | |
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255 | // Temperature compensated pressure (10...1200mbar with 0.01mbar resolution |
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256 | // P = digital pressure value * SENS - OFF = (D1 * SENS/2^21 -OFF)/2^15 |
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257 | *pressure = (int32_t)(((int64_t)raw_pressure * (sens / 0x200000) - off) / 32768); |
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258 | *temperature = (float)temp / 100.0; |
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259 | |
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260 | return ESP_OK; |
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261 | } |