If the modules loaded, you will see something in your cmd shell. That is why the write fails. Just remember: 512M Pi's use i2c port 1, 256M ones use i2c port 0! With lsmod command we can test, whether both modules loaded or not. Are you using a Raspberry Pi? Select 8 Advanced Options and then A7 I2C – Enable/Disable automatic loading 다운로드. In this quick tutorial we’ll enable the I2C bus on the Raspberry Pi. In the Raspberry Pi Software Configuration Tool, navigate to ‘Interfacing Options’. So follow the following steps to be able to enable the I2C communication in the Raspberry Pi. By default the Raspberry Pi comes with the I2C channel disabled. 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. It means, it is working. ... 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. In older Raspberry Pi models, navigate to ‘Advanced Options’ and then ‘I2C’. sudo nano /etc/modules append: i2c-bcm2708 i2c-dev I2C-Tools Wait until the yellow LED on the Raspberry Pi stops blinking before removing the power cord. The Raspberry Pi designers swapped over I2C ports between board releases. :D In the pop-up window, enable the Arm I2C interface and select ‘Yes’ to load the I2C Kernel Module. Lines beginning with "#" are ignored. Configure your Pi and enable the I2C sudo raspi-config Select Advanced Options -> I2C ->
to enable the I2C driver by kernel. There is no evidence that a device exists at address 0x77. You can't write to an I2C device which doesn't exist. Always shut down your Raspberry Pi by first typing sudo halt on the command line (or by selecting Shutdown from the GUI menu). When you are finished in raspi-config reboot for the i2c modules to automatically load into the kernel. This project calls for the SwitchDoc Labs HDC1080; if you are using an Amazon device, make sure to use a Grove patch cable. The next thing to do is add the I2C module to the kernel. If you are using Raspian Linux 3.18 or later, you need to go into the Raspberry Pi config utility and enable I2C. # # This file contains the names of kernel modules that should be loaded # at boot time, one per line. All done. sudo raspi-config. Prerequisites for Raspberry Pi I2C Configuration. The above line should be added just before the heading calculation is done. So the following discussion is oriented around the steps to install and the enabling the requisites for the I2C port in Raspberry Pi. Very unUnix. Enable i2c on the Raspberry Pi. pi@raspberrypi~ $ modprobe i2c-bcm2708; pi@raspberrypi~ $ modprobe i2c-dev; pi@raspberrypi~ $ lsmod. The Raspberry Pi does do not have an I2C bus 2, it has an I2C bus 0 and an I2C bus 1. The Raspberry Pi I2C buses. Then you can check if the I2C is enabled: lsmod If I2C enabled, the terminal echoes an i2c-bcm2708 device. Editing files is some much more fun (and dangerous). In each of the examples the ID 1 is used, for example “sudo i2cdetect -y 1”. 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. Run the command sudo nano /etc/modules.You should see the following file: # /etc/modules: kernel modules to load at boot time. 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