Why does the CAN Receive block from Raspberry Pi support package not work with PiCAN 2 shield in R2020a and earlier?

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I am using the PiCAN 2 CAN bus shield for Raspberry Pi. In my Simulink model, I inserted a CAN Receive block from the Simulink Support Package for Raspberry Pi. In the model's Configuration Parameters, I set the Interrupt Pin to 25. However, I am unable to observe any CAN bus signal.
When I use other tools such as Vector CANoe, I am able to observe the CAN bus signal. Why does the CAN Receive block from Raspberry Pi support package not work with PiCAN 2 shield?

Accepted Answer

MathWorks Support Team
MathWorks Support Team on 13 Oct 2021
Edited: MathWorks Support Team on 13 Oct 2021
Raspberry Pi CAN blocks are designed to work with MCP2515 based CAN shields such as the PiCAN2. For the PiCAN2 shield, however, the interrupt GPIO Pin may not be saved correctly in the code from the model's Configuration Parameters when using MATLAB R2020a or earlier. As a result, the interrupts triggered by the CAN shield are ignored.
To work around the issue, follow the below steps:
1. Execute the following command at the MATLAB Command Prompt:
>> cd(fullfile(codertarget.raspi.internal.getSpPkgRootDir,'include'))
2. Update the file “MW_MCP2515_CAN.h” in the above directory with the following changes at line 33. Replace
#define INTERRUPT_PIN 12
with
#define INTERRUPT_PIN (MW_CAN_INTERRUPTPIN)
3. Restart MATLAB and change the interruption pin accordingly.
  4 Comments
Chris Hada
Chris Hada on 3 Jun 2020
Hi Simone,
here's the latest answer from Support:
"We have discussed your last post with our development.
Regarding data drop while receiving multiple messages, this is currently a limitation within our implementation of the CAN blocks.
We are working on it and fix will be available in future releases. We will document this in the next September release.
There is currently unfortunately no workaround."
It seems, that the CAN Receive Blocks were not made for can buses with more than one Signal which is very strange.
Im trying to trigger a python script on the raspberry Pi via Simulink which gives me back a list of received CAN Signals.
In that case you also have to use the python scripts for transmitting CAN Signals.
Kind regards
Christof

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More Answers (1)

Chris Hada
Chris Hada on 14 Oct 2020
Hi Support Team,
is there now a Solution for that? Because the Simulink "CAN Receive" Blocks doesnt support multiple messages on any CAN Bus. Python examples still work.
Kind regards

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