Issue with receiving FDCAN data with STM3232H750

[revvathi]

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

[SofLit]

Hello @revvathi and welcome to the community,

Not sure I've understood the case.

You said :

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@revvathi wrote:

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

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

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@revvathi wrote:

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

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

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@revvathi wrote:

Txdata[2]={7,8};

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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.

[revvathi]

yes Txdata1 is from fdcan1 and rxdata1 being recieved from fdcan2 
like an array of TxData1={7,8} is being transmitted in my live expressions it only sends '8' to RxData1 and the rest buffer  becomes 0 in TxData1 and other  becomes 7 so basically Rxdata1 is receiving only 1 byte of 8 

[SofLit]

Hello,

You didn't share your project at least we can check.

[revvathi]

You can check out the code copy attached below

[SofLit]

Better to share the complete project.

[revvathi]

it isnt supporting the file type

[SofLit]

Compress your project with .rar or .zip format

[revvathi]

you can find the attached zip file for the whole test sample project 

[SofLit · Accepted solution]

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.