MATLAB Answers

How to access RaspberryPi I2c in Simulink

11 views (last 30 days)
Wayne
Wayne on 15 Mar 2013
Answered: Mirko on 23 May 2014
Is there a way to access the i2c bus on a Raspberry Pi with the new support package in Simulink? I dont see any straightforward way of doing it.

  0 Comments

Sign in to comment.

Answers (4)

Murat Belge
Murat Belge on 2 Apr 2013
There are no Simulink blocks to access I2C bus in the Raspberry Pi support package. However, that does not mean you can't do it. Using MATLAB function blocks, you can call Linux command line utilities i2cset and i2cget to read and write to the I2C bus. Someone used this approach to access the GPIO pins back when GPIO was not supported. Here is the link to the MATLAB FEX entry: http://www.mathworks.com/matlabcentral/fileexchange/38508-access-gpio-pins-on-beagleboard-from-simulink.
There is a multitude of references in Internet on how to use i2cset and i2cget functions. Before being able to use these, you need to install i2c-tools package on Raspbian Wheezy (run "sudo apt-get update; sudo apt-get install i2c-tools" on Linux shell to install). Here is a tutorial: https://www.ridgerun.com/developer/wiki/index.php/Developing_a_Linux_driver_for_a_chip_with_I2C_registers

  0 Comments

Sign in to comment.


utya
utya on 19 Apr 2013
hello. So i use i2cset and i2cget functions to recieva data from IMU. I use this code http://www.mathworks.com/matlabcentral/fileexchange/38508-access-gpio-pins-on-beagleboard-from-simulink
function y = fcn()
%#codegen
persistent pf;
pf = coder.opaque('FILE *');
y = coder.nullcopy(uint8(0));
res = coder.nullcopy(uint8(zeros(1, 10)));
readOnly = c_string('r');
readCmd = c_string(['i2cget -y 1 0x53 0x32']);
if isequal(coder.target, 'rtw')
pf = coder.ceval('popen', coder.rref(readCmd), coder.rref(readOnly));
coder.ceval('fgets', coder.wref(res), 10, pf);
coder.ceval('printf', c_string('%s'), c_string(res));
end
end
function str = c_string(str)
% Convert MATLAB string to C-string by adding a string termination
% character
str = [str, 0];
end
But i dont know how to send data to Scope. Please help me.

  0 Comments

Sign in to comment.


Lennart
Lennart on 3 May 2013
Hi there,
I was wondering whether anyone might know something like the i2cset and i2cget functin for I2S. Is there anything like that for a linux on a chip? Can't really find anything in combination with simulink :/

  0 Comments

Sign in to comment.


Mirko
Mirko on 23 May 2014
Hi, I am a new user of Matlab/Simulink, for the first time, I would like to make a connection between a raspberry pi I2C and an Arduino using simulink. Someone could explain how this code and where do I pick up the data read?
There is a place in simulink Sfunction that creates a connection with I2C read and write?

  0 Comments

Sign in to comment.

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by