STM32 F103RB CAN bus controller

Nicolas Cmb · ‎2017-05-09

Posted on May 09, 2017 at 13:05

Hi,

I'm not really an expert in CAN protocol communication but I know minimum about it. I read some forums which talk about transceiver and controller, which are necessary to communicate into CAN protocol.

So I take a MCP 2551 transceiver made by Microchip; but for the controller part, I don't even know if the microcontroller STM32 has an internal controller or not.

My question is the following one:

If the microcontroller STM32 has an internal controller how does it work.

And if it's not, what can I buy for it?

Thanks answer to my questions.

Nicolas.

Tesla DeLorean · ‎2017-05-09

Posted on May 09, 2017 at 15:04

That's what Data Sheets are for

http://www.st.com/content/ccc/resource/technical/document/datasheet/33/d4/6f/1d/df/0b/4c/6d/CD00161566.pdf/files/CD00161566.pdf/jcr:content/translations/en.CD00161566.pdf

Table 2 covers the peripheral counts in the different models.

The Reference Manual describes the peripheral, and the Standard Peripheral Library has examples of using it, as does the HAL/Cube. Look at the EVAL series board schematics to see how CAN is wired up.

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Nicolas Cmb · ‎2017-05-09

Posted on May 09, 2017 at 16:13

Thank you so much

Tamas Novak · ‎2017-05-11

Posted on May 11, 2017 at 10:01

There is a free application called 'CubeMX' you can download from ST, which helps you to select the proper MCU.

http://www.st.com/en/development-tools/stm32cubemx.html

You can tick 'CAN' checkbox and MX filters out STM32's not having CAN controller.

Nicolas Cmb · ‎2017-05-11

Posted on May 11, 2017 at 11:12

Thank you for your help,

To begin, I want to use CAN just for communicate between two STM32F103RB microcontrolers one send a message that the other one have to receive.

After that I will implement a cylinder which I will command with orders from one of those microcontrolers.

Nicolas Cmb · ‎2017-05-11

Posted on May 11, 2017 at 10:38

Thank you Tamas,

I've download it and begin to program but I want to know if the J1939 protocol is compatible with the CAN libraries.

Tamas Novak · ‎2017-05-11

Posted on May 11, 2017 at 10:58

I don't know too much on this subject, but J1939 seems a huge collection of standards:

http://store.sae.org/j1939/contents/

Physical layer conformity depends on CAN driver IC you choose, and higher levels mostly depend on your code running on STM32.

I assume the CAN core logic within STM32 is compatible. So the answer to your question is probably yes... but at most it depends on your work.