CAN2 in STM32F429I-DISC1

3 replies
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Hi guys,

I was trying to implement CAN in STM32F429I-DISC1. In that board when using PB5 and PB6 for CAN2 it is working but when using CAN2 with PB12 and PB13 it is not working and it shows bit dominant error. if any of you faced this error, help me to rectify it.

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mƎALLEmBest answer

ST Technical Moderator

Hello,

That's normal. See schematics of the board.

PB5/PB6 are free while PB12 and PB13 are connected to USB pin functions.

You can remove R67 to disconnect OTG_FS_ID but unfortunately you can't disconnect VBUS_FS.

So you need to use PB5/PB6.

To give better visibility on the answered topics, please click "Best answer" on the reply which solved your issue or answered your question.

mƎALLEmBest answer

ST Technical Moderator

Hello,

That's normal. See schematics of the board.

PB5/PB6 are free while PB12 and PB13 are connected to USB pin functions.

You can remove R67 to disconnect OTG_FS_ID but unfortunately you can't disconnect VBUS_FS.

So you need to use PB5/PB6.

To give better visibility on the answered topics, please click "Best answer" on the reply which solved your issue or answered your question.

G

gokul2507Author

Associate

Thanks for your reply.

Is there any way to particularly use that two specific pins(PB12 and PB13) for CAN communication?

mƎALLEm

ST Technical Moderator

Not possible. Except if you remove R67, U8 IC and maybe also R65. If you don't have the necessary a good desoldering tools it could be a tough task.

To give better visibility on the answered topics, please click "Best answer" on the reply which solved your issue or answered your question.

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