STM32F4xx CAN (controller area network) HAL_CAN_IsTxMessagePending

RFuji.2 · ‎2022-02-28

Hello

I am working with STM32F446ZET7.

I can't transmit data.

When I debugged it, it was looping with HAL_CAN_IsTxMessagePending.

Status was 1:Pending transmission request on at least one of the selected Tx Mailbox.

Can you think of any reasons?

SofLit · ‎2022-03-01

Hello,

1- Check your hardware:

Are you using a complete CAN bus: your STM32F4xx + CAN transceiver + another node connected to the bus (+ termination resistors) that will receive your messages?

2- Check your CAN bitrate configuration.

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RFuji.2 · ‎2022-03-03

I have found the cause.

It was caused by CAN transceiver(MCP2551) mode select pin.

Thank you.