Cannot use codegen with C code written for Arduino board

Question

Matthew Tieu 2022-12-17

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1880177-cannot-use-codegen-with-c-code-written-for-arduino-board

评论： Matthew Tieu 2022-12-21

Hi,

I am trying to make an executable mex file to change the PWM frequency of an Arduino pin since the Arduino hardware support add-on does not have a function to change the frequency of a PWM pin. To achieve this, I have been referring to the guide from the URL: https://au.mathworks.com/help/coder/ug/call-cc-code-from-matlab-code.html. In both the C source and header files, I have included the line:

#include <avr/io.h>

However, upon running codegen, I receive a message which states "??? Build error: C compilier produced errors. See the Build Log for details". If I check the build log, I can see the error message:

C:/Users/matth/Documents/MATLAB/writePWMFrequency.c:1:20: fatal error: avr/io.h: No such file or directory

#include <avr/io.h>

^

compilation terminated.

This implies that I need to somehow install avr-gcc in the MATLAB path. Is there a way to resolve my problem? For further info, this code is not for a homework task.

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Harshit Saini 2022-12-21

在 MATLAB Online 中打开

I have reproduced the error you are facing using the “Call C Code” example from the link you have provided. I moved the header file into a directory to replicate the path inside the code you are executing.

To resolve the error,

Make sure the path to the header file is defined correctly inside the two files it is referenced from.

i) inside the MATLAB file at the function

coder.cinclude(path)

ii) inside the C file

Make sure the header file exists inside the directory path where all the include files are located. As you are using “<>” syntax for including the header files, the pre-processor will search that predetermined directory path to locate the header file. If you enclose the header inside double quotations (""), the pre-processor will look for the header file in the same directory as the source file.

Matthew Tieu 2022-12-21

Hi Harshit,

I have included the header file. However, the issue is that the library 'avr/io.h' is not produced by me (similar to stdio.h and string.h). It is a library for AVR microcontrollers which is developed by teh company Microchip. This library requires a separate compilier called avr-gcc.

Regards

Matthew

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