Wed, 12 Apr 2023 16:23:02 +0200
Reduced I2C master speed from 400 to 100 Khz. Hope to get power-on init for BMP280 more reliable. Added warnings for I2C devices that are missing. Some logmessages reduced to debug log messages. Added extra 10 mSec delays before read shunt voltage in the INA219 task. Removed and reduced log levels in the MQTT task. Show received data events. Remove WiFi total time debug logging, it's ok now.
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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 | # FAQ |
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 | |
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.
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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.
Michiel Broek <mbroek@mbse.eu>
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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.
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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
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16 | |
1c9894662795
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17 | Common causes of I2C issues are: |
1c9894662795
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18 | |
1c9894662795
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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
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21 | * wrong I2C address |
1c9894662795
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22 | * broken I2C module |
1c9894662795
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23 | * the driver has a bug |
1c9894662795
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24 | |
1c9894662795
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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
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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
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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
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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
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35 | your wiring might have issues. If the scanner finds the I2C device, make sure |
1c9894662795
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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.
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37 | I2C modules, try them all. |
1c9894662795
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38 | |
1c9894662795
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39 | If the scanner finds the I2C device and you are sure that the wiring is |
1c9894662795
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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
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42 | |
1c9894662795
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43 | If the driver does not work after these steps, please [let us |
1c9894662795
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44 | know](https://github.com/UncleRus/esp-idf-lib/issues). |
1c9894662795
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45 | |
1c9894662795
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46 | ## Why are semaphores (mutexes) used in i2cdev routines? |
1c9894662795
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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
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51 | necessary to avoid problems in the situation mentioned in the documentation: |
1c9894662795
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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
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54 | different tasks, you need to take care of the multi-thread issue. |
1c9894662795
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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", ....); |
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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 | |
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81 | These mutexes are used when single device operation requires several I2C |
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82 | transactions in a row. |
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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. |
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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. |
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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). |