Performing an action after receiving a CAN message

[sonic_solutions]

Question moved from this thread (a new question)

Thank you very much for the solution. However, I’m still unclear about the core point.

My main concern is that I need CAN files such that, when the code is flashed onto the STM32L4R9I-EVAL board, it should behave in the following way: upon receiving a CAN message, the board should either print something which is predefined or perform an action in response to that message.

Could you please help me with this

[mƎALLEm]

Hello,

I recommend to use the Rx interrupts.

To print messages, you need to do it outside the interrupt handlers and the callback. You can for example set a flag in the interrupt handler and in the main if you check that flag was set, print the message you want.

If for example you need to toggle a LED, you can do it inside the interrupt.

You can inspire from this example: https://github.com/STMicroelectronics/STM32CubeF4/blob/master/Projects/STM324xG_EVAL/Examples/CAN/CAN_Networking/Src/main.c

Hope that helps.

[Andrew Neil]

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@sonic_solutions wrote:

should behave in the following way: upon receiving a CAN message, the board should either print something which is predefined or perform an action in response to that message.

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Well, that's pretty much the definition of any embedded system: it receives events from external interfaces, and then does something in response.

Your job, as the embedded system developer, is to write the code to implement that something.

As @mƎALLEm said, that might typically involve saving any data from the interrupt and/or setting a flag (or flags) to tell the rest of your code that data is available, and to do its work on it.