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 | # FAQ |
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 | |
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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3 | <!-- vim-markdown-toc GFM --> |
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 | |
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 | * [How to debug I2C-based drivers?](#how-to-debug-i2c-based-drivers) |
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 | * [Why are semaphores (mutexes) used in i2cdev routines?](#why-are-semaphores-mutexes-used-in-i2cdev-routines) |
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 | * [How can I connect multiple I2C devices?](#how-can-i-connect-multiple-i2c-devices) |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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8 | * [How can I change frequency of I2C clock? At default frequency my device is unstable or not working at all.](#how-can-i-change-frequency-of-i2c-clock-at-default-frequency-my-device-is-unstable-or-not-working-at-all) |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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9 | * [How to use internal pull-up resistors](#how-to-use-internal-pull-up-resistors) |
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 | * [Can I use I2C device drivers from interrupts?](#can-i-use-i2c-device-drivers-from-interrupts) |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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11 | * [Porting I2C libs to I2Cdev](#porting-i2c-libs-to-i2cdev) |
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 | |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
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13 | <!-- vim-markdown-toc --> |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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14 | |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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15 | ## How to debug I2C-based drivers? |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
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16 | |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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17 | Common causes of I2C issues are: |
1c9894662795
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18 | |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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19 | * wrong wiring |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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20 | * wrong pull-up resistors |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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21 | * wrong I2C address |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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22 | * broken I2C module |
1c9894662795
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23 | * the driver has a bug |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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24 | |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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25 | When any of I2C-based drivers does not work, follow the steps below. |
1c9894662795
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26 | |
1c9894662795
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27 | Build an [_I2C scanner_ device](examples/i2c_scanner). The device is not |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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28 | necessarily an ESP device. There are many examples for various platforms. |
1c9894662795
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29 | Search by keyword `i2c scanner`. |
1c9894662795
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30 | |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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31 | Connect the I2C module to the I2C scanner device. Make sure appropriate |
1c9894662795
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32 | pull-up resistors are connected to `SCL` and `SDA` lines. |
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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33 | |
1c9894662795
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34 | Scan devices on the I2C bus. If the scanner does not find the I2C device, then |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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35 | your wiring might have issues. If the scanner finds the I2C device, make sure |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
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36 | the address found is what the driver expects. If you have more than one same |
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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37 | I2C modules, try them all. |
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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38 | |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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39 | If the scanner finds the I2C device and you are sure that the wiring is |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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40 | correct, see the signals on the wire using an oscilloscope. Most oscilloscopes |
1c9894662795
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41 | can decode I2C signals and display I2C transactions in human-readable way. |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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42 | |
1c9894662795
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43 | If the driver does not work after these steps, please [let us |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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44 | know](https://github.com/UncleRus/esp-idf-lib/issues). |
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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45 | |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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46 | ## Why are semaphores (mutexes) used in i2cdev routines? |
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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47 | |
1c9894662795
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48 | i2cdev uses two types of mutexes: port and transactional. |
1c9894662795
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49 | |
1c9894662795
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50 | Port mutexes (there are only two of them, by the number of I2C ports) are |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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51 | necessary to avoid problems in the situation mentioned 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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52 | |
1c9894662795
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53 | > The I2C APIs are not thread-safe, if you want to use one I2C port in |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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54 | different tasks, you need to take care of the multi-thread issue. |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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55 | |
1c9894662795
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56 | They are taken before executing single I2C transactions and are released |
1c9894662795
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57 | immediately after them. |
1c9894662795
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58 | |
1c9894662795
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59 | Mutexes of the second type are created one per device and are necessary if |
1c9894662795
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60 | the same device is used in several tasks: |
1c9894662795
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61 | |
1c9894662795
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62 | ```C |
1c9894662795
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63 | static i2c_dev_t some_dev; |
1c9894662795
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64 | |
1c9894662795
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65 | void task1(void *arg) |
1c9894662795
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66 | { |
1c9894662795
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67 | // some_dev used here |
1c9894662795
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68 | } |
1c9894662795
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69 | |
1c9894662795
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70 | void task2(void *arg) |
1c9894662795
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71 | { |
1c9894662795
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72 | // and here some_dev used too |
1c9894662795
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73 | } |
1c9894662795
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74 | |
1c9894662795
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75 | ... |
1c9894662795
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76 | xTaskCreate(task1, "task1", ....); |
1c9894662795
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77 | xTaskCreate(task2, "task2", ....); |
1c9894662795
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78 | |
1c9894662795
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79 | ``` |
1c9894662795
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80 | |
1c9894662795
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81 | These mutexes are used when single device operation requires several I2C |
1c9894662795
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82 | transactions in a row. |
1c9894662795
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83 | |
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84 | ## How can I connect multiple I2C devices? |
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85 | |
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86 | With i2cdev, you can use almost any way to connect I2C devices. |
1c9894662795
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87 | |
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88 | For example, in the case of using SSD1306 and two MCP3428s, I would recommend |
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89 | connecting them like this: |
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90 | |
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91 | * 2 GPIO outputs on ESP32 for dedicated screen connection via I2C bus 0 |
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92 | * 2 GPIO outputs to the second I2C bus, to which 2 MCP3428 are connected with |
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93 | different addresses. |
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94 | |
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95 | If you need to connect more than one sensor with the same addresses and there |
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96 | are free GPIOs, then you can directly connect these sensors to individual GPIO |
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97 | outputs instead of using the I2C multiplexer. i2cdev will take care of |
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98 | reconfiguring I2C driver to the according outputs when you exchange data |
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99 | with these devices. |
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100 | |
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101 | ## How can I change frequency of I2C clock? At default frequency my device is unstable or not working at all. |
1c9894662795
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102 | |
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103 | You can change the frequency after initializing the device handler, like this: |
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104 | |
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105 | ```C |
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106 | #include <esp_idf_lib_helpers.h> |
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107 | |
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108 | ... |
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109 | |
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110 | ESP_ERROR_CHECK(ads111x_init_desc(&dev, addr, I2C_PORT, SDA_GPIO, SCL_GPIO)); |
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111 | |
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112 | #if HELPER_TARGET_IS_ESP32 |
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113 | dev.cfg.master.clk_speed = 100000; // Hz |
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114 | #endif |
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115 | |
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116 | ESP_ERROR_CHECK(ads111x_set_mode(&dev, ADS111X_MODE_CONTINUOUS)); // Continuous conversion mode |
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117 | ESP_ERROR_CHECK(ads111x_set_data_rate(&dev, ADS111X_DATA_RATE_32)); // 32 samples per second |
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118 | ... |
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119 | ``` |
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120 | |
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121 | ## How to use internal pull-up resistors |
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122 | |
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123 | Just enable them in `i2c_dev_t` config. For example: |
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124 | |
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125 | ```C |
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126 | ... |
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127 | |
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128 | dev.cfg.scl_pullup_en = true; |
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129 | dev.cfg.sda_pullup_en = true; |
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130 | ESP_ERROR_CHECK(ads111x_init_desc(&dev, addr, I2C_PORT, SDA_GPIO, SCL_GPIO)); |
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131 | |
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132 | ... |
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133 | ``` |
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134 | |
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135 | ## Can I use I2C device drivers from interrupts? |
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136 | |
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137 | With default configuration you can't. Since the drivers use mutexes, this will |
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138 | crash the system. But you can disable use of any I2C mutexes (both port and |
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139 | device) in configuration: just enable CONFIG_I2CDEV_NOLOCK. Keep in mind that |
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140 | after enabling this option all i2c device drivers will become non-thread safe. |
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141 | |
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142 | |
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143 | ## Porting I2C libs to I2Cdev |
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144 | |
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145 | See [porting.md](docs/porting.md). |