Mon, 03 Apr 2023 20:11:29 +0200
Changed voltage range to 32 volt. Tried INA219 powersave mode, doesn't work.
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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1 | /* |
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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2 | * Copyright (c) 2022 Ruslan V. Uss <unclerus@gmail.com> |
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 | * |
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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4 | * 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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5 | * 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>
parents:
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6 | * |
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 | * 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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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.
Michiel Broek <mbroek@mbse.eu>
parents:
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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.
Michiel Broek <mbroek@mbse.eu>
parents:
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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
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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12 | * 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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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
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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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
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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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
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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19 | * 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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20 | * 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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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
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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23 | * 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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24 | * 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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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 max31855.c |
1c9894662795
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30 | * |
1c9894662795
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31 | * ESP-IDF driver for MAX31855 cold-junction compensated |
1c9894662795
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32 | * thermocouple-to-digital converter |
1c9894662795
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33 | * |
1c9894662795
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34 | * Copyright (c) 2022 Ruslan V. Uss <unclerus@gmail.com> |
1c9894662795
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35 | * |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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36 | * BSD Licensed as described in the file LICENSE |
1c9894662795
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37 | */ |
1c9894662795
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38 | #include "max31855.h" |
1c9894662795
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39 | #include <string.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 | #define CHECK(x) do { esp_err_t __; if ((__ = x) != ESP_OK) return __; } while (0) |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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45 | #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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46 | |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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47 | #define BIT_TC_SIGN 31 |
1c9894662795
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48 | #define BIT_TC 18 |
1c9894662795
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49 | #define BIT_CJ_SIGN 15 |
1c9894662795
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50 | #define BIT_CJ 4 |
1c9894662795
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51 | #define BIT_SCV 2 |
1c9894662795
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52 | #define BIT_SCG 1 |
1c9894662795
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53 | #define BIT_OC 0 |
1c9894662795
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54 | |
1c9894662795
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55 | #define MASK_CJ 0x0fff |
1c9894662795
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56 | #define MASK_TC 0x3fff |
1c9894662795
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57 | |
1c9894662795
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58 | #define SIGN_CJ 0xf000 |
1c9894662795
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59 | #define SIGN_TC 0xc000 |
1c9894662795
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60 | |
1c9894662795
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61 | #define LSB_TC 0.25f |
1c9894662795
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62 | #define LSB_CJ 0.0625f |
1c9894662795
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63 | |
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64 | static inline esp_err_t read_32(max31855_t *dev, uint32_t *val) |
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65 | { |
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66 | spi_transaction_t t; |
1c9894662795
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67 | memset(&t, 0, sizeof(spi_transaction_t)); |
1c9894662795
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68 | |
1c9894662795
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69 | uint8_t rx[4]; |
1c9894662795
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70 | |
1c9894662795
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71 | t.tx_buffer = NULL; |
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72 | t.rx_buffer = rx; |
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73 | t.length = 32; |
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74 | CHECK(spi_device_transmit(dev->spi_dev, &t)); |
1c9894662795
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75 | |
1c9894662795
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76 | *val = ((uint32_t)rx[0] << 24) | ((uint32_t)rx[1] << 16) | ((uint32_t)rx[2] << 8) | rx[3]; |
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77 | |
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78 | return ESP_OK; |
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79 | } |
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80 | |
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81 | static inline esp_err_t max31855_get_raw_data(max31855_t *dev, int16_t *tc_t, int16_t *cj_t, bool *scv, bool *scg, bool *oc) |
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82 | { |
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83 | CHECK_ARG(dev && tc_t && cj_t && scv && scg && oc); |
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84 | |
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85 | uint32_t v = 0; |
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86 | CHECK(read_32(dev, &v)); |
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87 | |
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88 | // faults |
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89 | *scv = v & BIT(BIT_SCV) ? true : false; |
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90 | *scg = v & BIT(BIT_SCG) ? true : false; |
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91 | *oc = v & BIT(BIT_OC) ? true : false; |
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92 | |
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93 | // cold junction temperature |
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94 | *cj_t = (int16_t)((v >> BIT_CJ) & MASK_CJ) | (v & BIT(BIT_CJ_SIGN) ? SIGN_CJ : 0); |
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95 | |
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96 | // thermocouple temperature |
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97 | *tc_t = (int16_t)((v >> BIT_TC) & MASK_TC) | (v & BIT(BIT_TC_SIGN) ? SIGN_TC : 0); |
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98 | |
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99 | return ESP_OK; |
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100 | } |
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101 | |
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102 | /////////////////////////////////////////////////////////////////////////////// |
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103 | |
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104 | esp_err_t max31855_init_desc(max31855_t *dev, spi_host_device_t host, uint32_t clock_speed_hz, gpio_num_t cs_pin) |
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105 | { |
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106 | CHECK_ARG(dev); |
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107 | |
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108 | memset(&dev->spi_cfg, 0, sizeof(dev->spi_cfg)); |
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109 | dev->spi_cfg.spics_io_num = cs_pin; |
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110 | dev->spi_cfg.clock_speed_hz = clock_speed_hz; |
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111 | dev->spi_cfg.mode = 0; |
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112 | dev->spi_cfg.queue_size = 1; |
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113 | dev->spi_cfg.cs_ena_pretrans = 1; |
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114 | |
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115 | return spi_bus_add_device(host, &dev->spi_cfg, &dev->spi_dev); |
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116 | } |
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117 | |
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118 | esp_err_t max31855_free_desc(max31855_t *dev) |
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119 | { |
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120 | CHECK_ARG(dev); |
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121 | |
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122 | return spi_bus_remove_device(dev->spi_dev); |
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123 | } |
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124 | |
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125 | esp_err_t max31855_get_temperature(max31855_t *dev, float *tc_t, float *cj_t, bool *scv, bool *scg, bool *oc) |
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126 | { |
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127 | CHECK_ARG(tc_t); |
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128 | |
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129 | int16_t raw_tc = 0, raw_cj = 0; |
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130 | CHECK(max31855_get_raw_data(dev, &raw_tc, &raw_cj, scv, scg, oc)); |
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131 | |
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132 | *tc_t = (float)raw_tc * LSB_TC; |
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133 | if (cj_t) |
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134 | *cj_t = (float)raw_cj * LSB_CJ; |
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135 | |
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136 | return ESP_OK; |
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137 | } |