Cannot query I2C bus speed

Hi,

I’m using a Raspberry Pi 5 with the fresh latest OS and the MATLAB Support Package for Raspberry Pi. Last week I made a simple visualisaztion for gyroscope through i2c and it worked nicely. But today I had problem with this error when i try to do raspi

mypi = raspi('192.168.0.212', 'admin', 'raspberry');

Cannot query I2C bus speed.

Caused by:

Error using matlabshared.internal.ssh2client/execute

Error executing command "sudo cat /sys/module/i2c_bcm2708/parameters/baudrate". Details:

STDERR: cat: /sys/module/i2c_bcm2708/parameters/baudrate: No such file or directory

STDOUT:

So i looked everywhere, made a fresh OS install, flashed a bootloader. I tried enabling via GUI, raspi-config and matlab. Nothing worked. Interestingly when I disable i2c interface on pi I no longer get this error and can do things in matlab.

My /boot/config.txt correctly enables I2C and sets the baudrate:

[Patrik]

I also want to add that in linux I can acces the sensor without a problem.

Answer 1

[Patrik]

So I finally figure it out by

sudo modprobe i2c-bcm2708

that creates that baudrate file that Matlab is trying to read.

[Xiaoxing Wang]

Great answer. I had the same symptom and now my Raspberry Pi 5 works.