In the Raspberry Pi Software Configuration Tool, navigate to ‘Interfacing Options’. Select 8 Advanced Options and then A7 I2C – Enable/Disable automatic loading 다운로드. All done. The next thing to do is add the I2C module to the kernel. With lsmod command we can test, whether both modules loaded or not. If you are using Raspian Linux 3.18 or later, you need to go into the Raspberry Pi config utility and enable I2C. The original Raspberry Pi models A and B with a 26 pin GPIO header had a bus ID of 0 and used the following GPIO pins: Pin 3 – I2C SDA (Data) Are you using a Raspberry Pi? You can't write to an I2C device which doesn't exist. Configure your Pi and enable the I2C sudo raspi-config Select Advanced Options -> I2C ->
to enable the I2C driver by kernel. The Raspberry Pi designers swapped over I2C ports between board releases. Very unUnix. Prerequisites for Raspberry Pi I2C Configuration. In order to enable it we have two options: enable it “on-demand” or enable it by modifying some configuration files so it’s enabled by default at every start-up. Editing files is some much more fun (and dangerous). Lines beginning with "#" are ignored. Or on the PI 4 just use the desktop raspberry icon to open “Preferences”, then “Raspberry Pi Configuration”, and select the “Interfaces” tab, then click enable for the I2C. The Raspberry Pi I2C buses. Enable i2c on the Raspberry Pi. # # This file contains the names of kernel modules that should be loaded # at boot time, one per line. Else you can also add it manually. :D Run the command sudo nano /etc/modules.You should see the following file: # /etc/modules: kernel modules to load at boot time. Now reboot Raspberry Pi by entering the following command: sudo reboot Just remember: 512M Pi's use i2c port 1, 256M ones use i2c port 0! So the following discussion is oriented around the steps to install and the enabling the requisites for the I2C port in Raspberry Pi. By default the Raspberry Pi comes with the I2C channel disabled. The Raspberry Pi does do not have an I2C bus 2, it has an I2C bus 0 and an I2C bus 1. Step1: Open the Terminal Window of the Raspberry Pi. Then you can check if the I2C is enabled: lsmod If I2C enabled, the terminal echoes an i2c-bcm2708 device. # Parameters can be specified after the module name. There is no evidence that a device exists at address 0x77. This project calls for the SwitchDoc Labs HDC1080; if you are using an Amazon device, make sure to use a Grove patch cable. ... i2c_client is the pointer we used to open the i2c bus, command is the register we want to write to and value is the value we want to write. Each of the tools below takes a parameter for the ID of the target I2C bus on the Raspberry Pi. sudo nano /etc/modules append: i2c-bcm2708 i2c-dev I2C-Tools sudo raspi-config. That is why the write fails. So follow the following steps to be able to enable the I2C communication in the Raspberry Pi. Always shut down your Raspberry Pi by first typing sudo halt on the command line (or by selecting Shutdown from the GUI menu). If the modules loaded, you will see something in your cmd shell. In each of the examples the ID 1 is used, for example “sudo i2cdetect -y 1”. Wait until the yellow LED on the Raspberry Pi stops blinking before removing the power cord. In the pop-up window, enable the Arm I2C interface and select ‘Yes’ to load the I2C Kernel Module. When you are finished in raspi-config reboot for the i2c modules to automatically load into the kernel. The above line should be added just before the heading calculation is done. 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