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Javier Parra
Javier Parra
Associate II
October 6, 2022
Solved

STM32F103C8T6 (Blue Pill) CAN BUS Communication

  • October 6, 2022
  • 5 replies
  • 17992 views

Hi,

I´m trying to communicate two blue pills between them using CAN bus, but when I try to run it, it doesn´t even finish the start up, because I tried to use a blink program selecting the CAN in the .ioc and not using it and doesn´t work.

Does anyone knows why does this happen?

This topic has been closed for replies.
Best answer by Peter BENSCH

The so-called Blue Pill use illegally cloned STM32F103. ST resources are only dedicated to supporting genuine ST products. We are not committed to ensuring that clones/fakes products work properly with the firmware we provide.

We recommend to purchase genuine products from STMicroelectronics and purchase them from known and trusted distributors.

This thread will now be locked. However, if you face difficulties while using genuine ST products, we’re here to assist you. Please feel free to start a new thread, and our team, along with community members, will be ready to help you with any issues/questions you encounter.

Thank you for your understanding.

Regards
/Peter

5 replies

Tesla DeLorean
Tesla DeLorean
Guru
October 6, 2022

Perhaps you should use a debugger to establish what's going on?

​

I​ will note the F103 can't support CAN and USB concurrently.

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Javier Parra
Javier ParraAuthor
Associate II
October 10, 2022

Hello, thank you for your comment.

I'm not using the USB, I have the st-link v2 programmer but I don´t use the USB.

I
Imen.D
Technical Moderator
October 7, 2022

Hello @Javier Parra​ and welcome to the Community :)

As @Community member​ said , it may be related to the use of USB and CAN with STM32F103:

Concurrent use of USB and CAN with STM32F103

When your question is answered, please close this topic by choosing Select as Best. This will help other users find that answer faster.

Imen

"When your question is answered, please close this topic by clicking ""Accept as Solution"".ThanksImen"
mƎALLEm
mƎALLEm
Technical Moderator
October 7, 2022

Hello,

Does "Blue Pill" board embed CAN transceiver (I think not) ? If not, did you add this external component?

If not, it will never work!

To give better visibility on the answered topics, please click "Best answer" on the reply which solved your issue or answered your question.
Johi
Johi
Senior II
October 9, 2022

@SofLit,

I think your statement is not correct: if on both side there is no tranceiver it can work for sure.

See "Beginning STM32, by Warren Gay ISBN978-1-4842-3623-9" P317 Chapter 18 CAN-bus"

RX and TX are connected to the same bus with a 4.7K pull up resistor.

Best Regards,

Johi.

mƎALLEm
mƎALLEm
Technical Moderator
October 10, 2022

@Johi,

We do NOT support this kind of "exotic" connections and we don't guarantee the behavior during the communication .. So, in normal mode, CAN bus SHOULD be used with transceivers in a complete bus configuration.

To give better visibility on the answered topics, please click "Best answer" on the reply which solved your issue or answered your question.
Peter BENSCH
Peter BENSCH
Technical Moderator
November 10, 2022

I just stumbled across this thread because, like many others, it deals with the Bluepill. For a long time now, only clones and counterfeits have been used on it, which can flash an LED but do not (cannot) support many other peripheral functions. I now strongly suspect that there is also a counterfeit on your Bluepill.

Are you 100% sure that it is an original STM32F103?

Please check websites like e.g. hackaday.io or eevblog.com.

Regards

/Peter

In order to give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.
Peter BENSCH
Peter BENSCHAnswer
Technical Moderator
April 25, 2025

The so-called Blue Pill use illegally cloned STM32F103. ST resources are only dedicated to supporting genuine ST products. We are not committed to ensuring that clones/fakes products work properly with the firmware we provide.

We recommend to purchase genuine products from STMicroelectronics and purchase them from known and trusted distributors.

This thread will now be locked. However, if you face difficulties while using genuine ST products, we’re here to assist you. Please feel free to start a new thread, and our team, along with community members, will be ready to help you with any issues/questions you encounter.

Thank you for your understanding.

Regards
/Peter

In order to give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.
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