Issue with receiving FDCAN data with STM3232H750

Question

I have debugged the whole code to send data from stm32h750b-dk between the two fdcan terminals fdcan1 and fdcan2 the data is appearing on live expressions of txdata1 but in rxdata only 1 bit is being transferred can somebody mention what the problem could be all my parameters are adjusted accurately 
Txdata[2]={7,8};
this is the output which is shown can somebody help me out on wtt could be done

mƎALLEm · Accepted Answer

Thank your for the sharing.You didn't activate the FDCAN2 IRQ:I'm attaching your project (modified) where FDCAN2 is receiving these two bytes.This is a screen shot of the debug session, the bytes 7 and 8 are well received with FDCAN2 and a counter counting the number of the reception I've added in the example:Another thing to add:In the sending operation you didn't wait for the Tx FIFO to be empty which will cause a send error.I've added it as the following: while((hfdcan1.Instance->TXFQS & FDCAN_TXFQS_TFQF) != 0U); // wait for Tx FIFO to be empty status = HAL_FDCAN_AddMessageToTxFifoQ(&hfdcan1, &TxHeader1, TxData1); if (status != HAL_OK) { Error_Handler(); } }Don't forget to fit the jumpers JP6 and JP7 to connect the CAN terminating resistors (120ohm) on the board.A recommendation before running the example I shared, please update to the latest version of STM32CubeMx V6.13.0.Hope that helps.

mƎALLEm · Answer

Hello @revvathi and welcome to the community,

Not sure I've understood the case.

You said :

@revvathi wrote:

I have debugged the whole code to send data from stm32h750d-bk between the two fdcan terminals fdcan1 and fdcan2

So TxData1 is the buffer sent by FDCAN1 and RxData1 is the data received by FDCAN2?

@revvathi wrote:

the data is appearing on live expressions of txdata1 but in rxdata only 1 bit is being transferred

What do you mean by only "1 bit" is transferred? do you mean 1 byte?

@revvathi wrote:

Txdata[2]={7,8};

Here Txdata (do you mean Txdata1?) contains two bytes 7 and 8 but in the live expression it's showing 0 and 7. That's not clear.

I propose to share your project to look at it closely.

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