MATLAB: Do I get ‘undefined reference to “c-method” ‘ error when trying to load the matlab function to arduino uno

Question

Hi, I have a Simulink model containing a matlab function block. In this function two methods from my .c file are called, hc595_Init and hc595_SendData. These should set the selected pins as outputs and set them to low/high. When I try to download the simulink model to my arduino Uno I get the following error:

Error(s) encountered while building "Fan": ### Failed to generate all binary outputs

In the code generation report it says:

C:\Program Files\MATLAB\R2017b\Fan_ert_rtw/Fan.c:61: undefined reference to `hc595_Init' C:\Program Files\MATLAB\R2017b\Fan_ert_rtw/Fan.c:134: undefined reference to `hc595_SendData' collect2.exe: error: ld returned 1 exit status gmake: * [../Fan.elf] Error 1 C:\Program Files\MATLAB\R2017b\Fan_ert_rtw>echo The make command returned an error of 2 The make command returned an error of 2 C:\Program Files\MATLAB\R2017b\Fan_ert_rtw>An_error_occurred_during_the_call_to_make Der Befehl "An_error_occurred_during_the_call_to_make" ist entweder falsch geschrieben oder konnte nicht gefunden werden.

Can anybody tell me why this error occurs?

Thanks!

Answer 1

You need to add the your .c and .h files in the Simulation Target pane of the Configuration parameters of the model. Here is the exact procedure you need to follow:

Integrate C Code Using the MATLAB Function Block

Hope this helps.

- Shashank