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.
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2 | * Copyright (c) 2021 Ruslan V. Uss <unclerus@gmail.com> |
1c9894662795
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3 | * |
1c9894662795
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4 | * Redistribution and use in source and binary forms, with or without |
1c9894662795
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5 | * modification, are permitted provided that the following conditions are met: |
1c9894662795
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6 | * |
1c9894662795
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7 | * 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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8 | * 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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9 | * 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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10 | * 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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11 | * and/or other materials provided with the distribution. |
1c9894662795
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12 | * 3. Neither the name of the copyright holder nor the names of itscontributors |
1c9894662795
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13 | * 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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14 | * specific prior written permission. |
1c9894662795
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15 | * |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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16 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
1c9894662795
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17 | * 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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18 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
1c9894662795
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19 | * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE |
1c9894662795
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20 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
1c9894662795
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21 | * 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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22 | * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
1c9894662795
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23 | * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
1c9894662795
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24 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
1c9894662795
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25 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
1c9894662795
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26 | */ |
1c9894662795
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27 | |
1c9894662795
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28 | /** |
1c9894662795
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29 | * @file max31865.c |
1c9894662795
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30 | * |
1c9894662795
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31 | * ESP-IDF driver for MAX31865, resistance converter for platinum RTDs |
1c9894662795
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32 | * |
1c9894662795
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33 | * Copyright (c) 2021 Ruslan V. Uss <unclerus@gmail.com> |
1c9894662795
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34 | * |
1c9894662795
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35 | * BSD Licensed as described in the file LICENSE |
1c9894662795
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36 | */ |
1c9894662795
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37 | #include "max31865.h" |
1c9894662795
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38 | #include <string.h> |
1c9894662795
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39 | #include <esp_log.h> |
1c9894662795
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40 | #include <math.h> |
1c9894662795
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41 | #include <freertos/FreeRTOS.h> |
1c9894662795
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42 | #include <freertos/task.h> |
1c9894662795
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43 | |
1c9894662795
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44 | static const char *TAG = "max31865"; |
1c9894662795
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45 | |
1c9894662795
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46 | #define REG_CONFIG (0x00) |
1c9894662795
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47 | #define REG_RTD_MSB (0x01) |
1c9894662795
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48 | #define REG_HIGH_FAULT_MSB (0x03) |
1c9894662795
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49 | #define REG_LOW_FAULT_MSB (0x05) |
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50 | #define REG_FAULT_STATUS (0x07) |
1c9894662795
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51 | |
1c9894662795
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52 | #define BIT_CONFIG_50HZ BIT(0) |
1c9894662795
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53 | #define BIT_CONFIG_FAULT_CLEAR BIT(1) |
1c9894662795
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54 | #define BIT_CONFIG_FAULT_D2 BIT(2) |
1c9894662795
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55 | #define BIT_CONFIG_FAULT_D3 BIT(3) |
1c9894662795
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56 | #define BIT_CONFIG_3WIRE BIT(4) |
1c9894662795
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57 | #define BIT_CONFIG_1SHOT BIT(5) |
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58 | #define BIT_CONFIG_AUTO BIT(6) |
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59 | #define BIT_CONFIG_VBIAS BIT(7) |
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60 | |
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61 | #define MASK_CONFIG_FAULT (BIT_CONFIG_FAULT_D2 | BIT_CONFIG_FAULT_D3) |
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62 | |
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63 | typedef struct |
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64 | { |
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65 | float a, b; |
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66 | } rtd_coeff_t; |
1c9894662795
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67 | |
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68 | static const rtd_coeff_t rtd_coeff[] = { |
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69 | [MAX31865_ITS90] = { .a = 3.9083e-3f, .b = -5.775e-7f }, |
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70 | [MAX31865_DIN43760] = { .a = 3.9848e-3f, .b = -5.8019e-7f }, |
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71 | [MAX31865_US_INDUSTRIAL] = { .a = 3.9692e-3f, .b = -5.8495e-7f }, |
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72 | }; |
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73 | |
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74 | #define CHECK(x) do { esp_err_t __; if ((__ = x) != ESP_OK) return __; } while (0) |
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75 | #define CHECK_ARG(VAL) do { if (!(VAL)) return ESP_ERR_INVALID_ARG; } while (0) |
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76 | |
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77 | static esp_err_t write_reg_8(max31865_t *dev, uint8_t reg, uint8_t val) |
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78 | { |
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79 | spi_transaction_t t; |
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80 | memset(&t, 0, sizeof(spi_transaction_t)); |
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81 | |
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82 | uint8_t tx[] = { reg | 0x80, val }; |
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83 | |
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84 | t.tx_buffer = tx; |
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85 | t.length = sizeof(tx) * 8; |
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86 | |
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87 | return spi_device_transmit(dev->spi_dev, &t); |
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88 | } |
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89 | |
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90 | static esp_err_t read_reg_8(max31865_t *dev, uint8_t reg, uint8_t *val) |
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91 | { |
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92 | spi_transaction_t t; |
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93 | memset(&t, 0, sizeof(spi_transaction_t)); |
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94 | |
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95 | uint8_t tx[] = { reg, 0 }; |
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96 | uint8_t rx[sizeof(tx)]; |
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97 | |
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98 | t.tx_buffer = tx; |
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99 | t.rx_buffer = rx; |
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100 | t.length = sizeof(tx) * 8; |
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101 | CHECK(spi_device_transmit(dev->spi_dev, &t)); |
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102 | |
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103 | *val = rx[1]; |
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104 | |
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105 | return ESP_OK; |
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106 | } |
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107 | |
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108 | static esp_err_t read_reg_16(max31865_t *dev, uint8_t reg, uint16_t *val) |
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109 | { |
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110 | spi_transaction_t t; |
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111 | memset(&t, 0, sizeof(spi_transaction_t)); |
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112 | |
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113 | uint8_t tx[] = { reg, 0, 0 }; |
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114 | uint8_t rx[sizeof(tx)]; |
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115 | |
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116 | t.tx_buffer = tx; |
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117 | t.rx_buffer = rx; |
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118 | t.length = sizeof(tx) * 8; |
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119 | CHECK(spi_device_transmit(dev->spi_dev, &t)); |
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120 | |
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121 | *val = (uint16_t)rx[1] << 8; |
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122 | *val |= rx[2]; |
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123 | |
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124 | return ESP_OK; |
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125 | } |
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126 | |
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127 | /////////////////////////////////////////////////////////////////////////////// |
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128 | |
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129 | esp_err_t max31865_init_desc(max31865_t *dev, spi_host_device_t host, uint32_t clock_speed_hz, gpio_num_t cs_pin) |
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130 | { |
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131 | CHECK_ARG(dev); |
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132 | |
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133 | memset(&dev->spi_cfg, 0, sizeof(dev->spi_cfg)); |
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134 | dev->spi_cfg.spics_io_num = cs_pin; |
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135 | dev->spi_cfg.clock_speed_hz = clock_speed_hz; |
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136 | dev->spi_cfg.mode = 1; |
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137 | dev->spi_cfg.queue_size = 1; |
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138 | dev->spi_cfg.cs_ena_pretrans = 1; |
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139 | //dev->spi_cfg.flags = SPI_DEVICE_NO_DUMMY; |
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140 | |
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141 | return spi_bus_add_device(host, &dev->spi_cfg, &dev->spi_dev); |
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142 | } |
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143 | |
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144 | esp_err_t max31865_free_desc(max31865_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 spi_bus_remove_device(dev->spi_dev); |
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149 | } |
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150 | |
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151 | esp_err_t max31865_set_config(max31865_t *dev, const max31865_config_t *config) |
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152 | { |
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153 | CHECK_ARG(dev && config); |
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154 | |
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155 | uint8_t val; |
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156 | CHECK(read_reg_8(dev, REG_CONFIG, &val)); |
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157 | |
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158 | val &= ~(BIT_CONFIG_AUTO | BIT_CONFIG_3WIRE | BIT_CONFIG_VBIAS | BIT_CONFIG_50HZ); |
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159 | |
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160 | val |= config->mode == MAX31865_MODE_AUTO ? BIT_CONFIG_AUTO : 0; |
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161 | val |= config->connection == MAX31865_3WIRE ? BIT_CONFIG_3WIRE : 0; |
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162 | val |= config->v_bias ? BIT_CONFIG_VBIAS : 0; |
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163 | val |= config->filter == MAX31865_FILTER_50HZ ? BIT_CONFIG_50HZ : 0; |
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164 | |
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165 | CHECK(write_reg_8(dev, REG_CONFIG, val)); |
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166 | |
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167 | return ESP_OK; |
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168 | } |
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169 | |
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170 | esp_err_t max31865_get_config(max31865_t *dev, max31865_config_t *config) |
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171 | { |
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172 | CHECK_ARG(dev && config); |
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173 | |
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174 | uint8_t val; |
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175 | CHECK(read_reg_8(dev, REG_CONFIG, &val)); |
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176 | |
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177 | config->filter = val & BIT_CONFIG_50HZ ? MAX31865_FILTER_50HZ : MAX31865_FILTER_60HZ; |
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178 | config->v_bias = val & BIT_CONFIG_VBIAS ? 1 : 0; |
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179 | config->mode = val & BIT_CONFIG_AUTO ? MAX31865_MODE_AUTO : MAX31865_MODE_SINGLE; |
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180 | config->connection = val & BIT_CONFIG_3WIRE ? MAX31865_3WIRE : MAX31865_2WIRE; |
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181 | |
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182 | return ESP_OK; |
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183 | } |
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184 | |
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185 | esp_err_t max31865_start_measurement(max31865_t *dev) |
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186 | { |
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187 | CHECK_ARG(dev); |
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188 | |
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189 | uint8_t val; |
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190 | CHECK(read_reg_8(dev, REG_CONFIG, &val)); |
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191 | val |= BIT_CONFIG_1SHOT; |
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192 | CHECK(write_reg_8(dev, REG_CONFIG, val)); |
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193 | |
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194 | return ESP_OK; |
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195 | } |
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196 | |
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197 | esp_err_t max31865_read_raw(max31865_t *dev, uint16_t *raw, bool *fault) |
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198 | { |
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199 | CHECK_ARG(dev && raw && fault); |
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200 | |
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201 | CHECK(read_reg_16(dev, REG_RTD_MSB, raw)); |
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202 | *fault = *raw & 1; |
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203 | *raw >>= 1; |
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204 | |
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205 | return ESP_OK; |
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206 | } |
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207 | |
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208 | // conversion code taken from Adafruit library |
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209 | esp_err_t max31865_read_temperature(max31865_t *dev, float *temp) |
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210 | { |
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211 | CHECK_ARG(dev && temp && dev->standard <= MAX31865_US_INDUSTRIAL); |
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212 | |
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213 | uint16_t raw; |
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214 | bool fault; |
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215 | CHECK(max31865_read_raw(dev, &raw, &fault)); |
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216 | if (fault) |
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217 | { |
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218 | ESP_LOGE(TAG, "[CS %d] Fault detected", dev->spi_cfg.spics_io_num); |
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219 | return ESP_FAIL; |
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220 | } |
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221 | |
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222 | float r_rtd = raw * dev->r_ref / 32768; |
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223 | |
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224 | ESP_LOGD(TAG, "[CS %d] RTD resistance: %.8f", dev->spi_cfg.spics_io_num, r_rtd); |
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225 | |
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226 | const rtd_coeff_t *c = rtd_coeff + dev->standard; |
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227 | |
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228 | *temp = (sqrtf((c->a * c->a - (4 * c->b)) + (4 * c->b / dev->rtd_nominal * r_rtd)) - c->a) / (2 * c->b); |
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229 | |
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230 | if (*temp >= 0) |
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231 | return ESP_OK; |
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232 | |
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233 | // below zero |
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234 | r_rtd = r_rtd / dev->rtd_nominal * 100; // normalize to 100 Ohm |
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235 | |
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236 | float rpoly = r_rtd; |
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237 | |
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238 | *temp = -242.02; |
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239 | *temp += 2.2228 * rpoly; |
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240 | rpoly *= r_rtd; // square |
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241 | *temp += 2.5859e-3 * rpoly; |
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242 | rpoly *= r_rtd; // ^3 |
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243 | *temp -= 4.8260e-6 * rpoly; |
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244 | rpoly *= r_rtd; // ^4 |
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245 | *temp -= 2.8183e-8 * rpoly; |
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246 | rpoly *= r_rtd; // ^5 |
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247 | *temp += 1.5243e-10 * rpoly; |
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248 | |
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249 | return ESP_OK; |
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250 | } |
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251 | |
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252 | esp_err_t max31865_measure(max31865_t *dev, float *temp) |
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253 | { |
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254 | CHECK(max31865_start_measurement(dev)); |
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255 | vTaskDelay(pdMS_TO_TICKS(70)); |
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256 | return max31865_read_temperature(dev, temp); |
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257 | } |
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258 | |
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259 | esp_err_t max31865_detect_fault_auto(max31865_t *dev) |
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260 | { |
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261 | CHECK_ARG(dev); |
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262 | |
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263 | uint8_t conf; |
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264 | CHECK(read_reg_8(dev, REG_CONFIG, &conf)); |
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265 | |
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266 | uint8_t fault_bits = conf & MASK_CONFIG_FAULT; |
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267 | if (fault_bits == BIT_CONFIG_FAULT_D2) |
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268 | { |
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269 | ESP_LOGD(TAG, "[CS %d] Automatic fault detection still running", dev->spi_cfg.spics_io_num); |
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270 | return ESP_ERR_INVALID_STATE; |
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271 | } |
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272 | if (fault_bits == BIT_CONFIG_FAULT_D3) |
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273 | { |
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274 | ESP_LOGD(TAG, "[CS %d] Manual cycle 1 still running, waiting for user to start cycle 2", dev->spi_cfg.spics_io_num); |
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275 | return ESP_ERR_INVALID_STATE; |
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276 | } |
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277 | if (fault_bits == (BIT_CONFIG_FAULT_D2 | BIT_CONFIG_FAULT_D3)) |
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278 | { |
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279 | ESP_LOGD(TAG, "[CS %d] Manual cycle 2 still running", dev->spi_cfg.spics_io_num); |
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280 | return ESP_ERR_INVALID_STATE; |
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281 | } |
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282 | |
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283 | CHECK(write_reg_8(dev, REG_CONFIG, BIT_CONFIG_VBIAS | BIT_CONFIG_FAULT_D2)); |
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284 | |
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285 | uint8_t tmp; |
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286 | do |
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287 | { |
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288 | // FIXME endless loop |
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289 | CHECK(read_reg_8(dev, REG_CONFIG, &tmp)); |
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290 | } |
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291 | while (tmp & MASK_CONFIG_FAULT); |
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292 | |
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293 | return ESP_OK; |
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294 | } |
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295 | |
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296 | esp_err_t max31865_get_fault_status(max31865_t *dev, uint8_t *fault_status) |
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297 | { |
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298 | CHECK_ARG(dev && fault_status); |
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299 | |
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300 | return read_reg_8(dev, REG_FAULT_STATUS, fault_status); |
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301 | } |
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302 | |
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303 | esp_err_t max31865_clear_fault_status(max31865_t *dev) |
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304 | { |
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305 | CHECK_ARG(dev); |
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306 | |
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307 | uint8_t val; |
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308 | CHECK(read_reg_8(dev, REG_CONFIG, &val)); |
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309 | val &= ~(BIT_CONFIG_1SHOT | BIT_CONFIG_FAULT_D2 | BIT_CONFIG_FAULT_D3); |
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310 | val |= BIT_CONFIG_FAULT_CLEAR; |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
311 | CHECK(write_reg_8(dev, REG_CONFIG, val)); |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
312 | |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
313 | return ESP_OK; |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
314 | } |