CAN communication between 3 Nucleo boards

[Srivatsan]

Hi,

I am trying to establish CAN communication between three different MCUs: NUCLEO-H723ZG, NUCLEO-H755ZIQ, and NUCLEO-G474RE. However, I am unable to successfully communicate between the boards, even though the same baud rate has been configured on all MCUs. I have also connected an external CAN transceiver to each board for proper CAN bus operation.

On the NUCLEO-G474RE, I have enabled UART4 to send command data, using the following pins:

• PC11 – UART4_RX

• PC10 – UART4_TX

Clock Frequency [SYSCLK] & Baud Rate [CAN]:

1. NUCLEO-H723ZG: 550 MHz

    Baud Rate: 500000 Bit/s

2. NUCLEO-H755ZIQ: 480 MHz

    Baud Rate: 500000 Bit/s

3. NUCLEO-G474RE: 170 MHz

    Baud Rate: 500000 Bit/s

[Srivatsan]

I've logic analyzer. I've connected the logic analyzer and taken the output. 

connecting the G474RE board-1 with the H723ZG Board:

connecting the G474RE board-2 with the H723ZG Board:

connecting the G474RE board-1 & board-2 with the H723ZG Board:

connecting only the H723ZG board-3:

Sorry, hereafter I won't change any things in the .ioc file. I have uploaded the latest .ioc file which is attached.

[mƎALLEm · Accepted solution]

I don't know what you did behind the scene. What Channel 1 refers to? G4 FDCAN Tx? or CAN analyzer Tx?

If one of them, H7 FDCAN_Rx is not receiving anything, so it's a hardware issue either a wiring issue or a transceiver issue. 

- So check your wiring on H7 side 

- Check the power supply of your transceiver

- Even, replace the transceiver used by STM32H7.