calling a c++ function using coder.ceval to be compiled on raspberrypi [error ./MW/modelname: No such file or directory]

Hello,

I'm trying to access GPIOs by calling a c++ function (which uses the wiringPi) in simulink. The matlab function used in the model looks something like this :

function ledf(signalin)
%#codegen

persistent initflag;

coder.cinclude('/home/pi/blinkerf.h');
if strcmp(coder.target, 'rtw')
    if isempty(initflag)
        % Initialize step
        coder.ceval('blinker_init');
        initflag = 1;
    else
        % Output step
        coder.ceval('blinker_update',coder.ref(signalin));
    end

end

the functions ("blinker_init" and "blinker_update") and the header file blinkerf work fine when used directly on the raspberryPi in a c++ code, however when I try to deploy the model I get this error :

Error executing SSH command: make: Entering directory '/home/pi/simublink_rtt'
"g++"   -lm -ldl -lpthread -lrt  -o final ./MW/simublink -lwiringPi
g++: error: ./MW/simublink: No such file or directory
_simublink.mk:122: recipe for target 'MW/simublink' failed
make: *** [MW/simublink] Error 1
make: Leaving directory '/home/pi/simublink_rtt'

just in case, the Xmake configurations look like this:

I have no idea what should be found in this address or how i can modify this path. Any hints would be appreciated.

Thanks

Arman

[Vaibhav Awale]

Hi Arman,

Are you able to run any demo models shipped with the Rasberry pi support package?

The demo models can be found by entering following command at MATLAB command prompt:

raspi_examples

Are you able to run any other C++ functions on your board using the above approach?

Regards,

Vaibhav

[arman sani]

Hi Vaibhav, raspi_example doesn work I'm not sure what I'm doing wrong there! and none of the examples, that are incluided in the support package, use C++ functions directly. They are all made up of RaspberryPi blocks. regards Arman

[Dennis]

Hi, I got the same error: Integrating custom code works with simulation, but not on another target. It seems like Matlab does not transfer the custom code to the raspberry pi. Ich checked the pi folders where stuff is compiled, and everything is copied there except my custom code. I integrated headers and .c references in both locations in the simulink options.

https://de.mathworks.com/matlabcentral/answers/262856-coder-ceval-on-raspberry-pi-undefined-reference-error

Answer 1

[Venkatachala Sarma]

Hi,

This looks like a path issue. While including external code for Simulation and Code Generation, it is necessary to provide the include path and the names of the C++ files in the "Custom Code" Section of Configuration Parameters in addition to providing that information in the 'code.ceval' function. The external code information should be provided in the 'Simulation Target' tab and 'Code Generation' tab for them to be linked while performing Simulation and Code Generation respectively.

Go through the following documentation links to understand how to provide the include directory and C++ files in the Custom Code section.

Integrate Custom C/C++ Code for Code Generation

Integrate Custom C/C++ Code for Simulation

Hope this helps.

Regards,

Venkatachala Sarma

[arman sani]

Hi, I'll take a look at it as soon as I can. I actually gave up on MATLAB function and redid everything from scratch with S-function builder and fortunately it's working now. I'll post it here if find out where the problem was. Tanks a lot Arman