cancel
Showing results for 
Search instead for 
Did you mean: 

STM32F74G-DISCO and STM32f407VGT6 with CAN bus communication not working

PAra.1
Associate II

Hello,

I have two boards: STM32F74G-DISCO and STM32f407VGT6 

They are connected with CAN bus, but the connection is not working. On the picture in attachment is my schema. I think that my code is okay, but I am not sure about schema. I have two transceivers MCP2551. I can paste also the code, if needed.

Thanks for answers.

1 ACCEPTED SOLUTION

Accepted Solutions
PAra.1
Associate II

I changed transceivers and used new ones: MCP2542. Now it is working fine.

Thank you very much for your answers.

View solution in original post

4 REPLIES 4

Common the ground on the F746 side

Tips, buy me a coffee, or three.. PayPal Venmo Up vote any posts that you find helpful, it shows what's working..

I have tried it, but the same result. Both boards are also connected to the same PC, so there should not be the problem with ground.

Nikita91
Lead II

According to the MCP2551 datasheet, the driver may be in standby mode: V Rs > 0.75 VDD

See table 1-1

Rs pin must be tied to ground through a resistor

PAra.1
Associate II

I changed transceivers and used new ones: MCP2542. Now it is working fine.

Thank you very much for your answers.