TM4C1294NCPDT: CAN transmit Message pending

Tom M

Part Number: TM4C1294NCPDT

Hi.,

I am using Tiva TM4C1294NCPDT microcontroller. I'm transmitting and receiving data using CAN communication.I connected the two pcb using 4 wire CAN connector(Vcc,CANH,CANL,Gnd).

My question is

The 1st PCB was transmitting the data to 2nd PCB,after 1sec if 1st pcb did not get reply from 2nd pcb,it throws CAN communication error and try to reconnect with 2nd pcb by transmitting the data again.Even if data is send to 2nd pcb,its not entering into the interrupt handler(tested using break points) of 2nd pcb.

We are using CAN Analyzer for experiment the above issue,1st PCB sending the data again and again but 2nd pcb was not receiving the data.

My assumption is that the error may occur due to transmission pending message in 2nd pcb. what is the way to clear this issue?

Thank you

over 2 years ago

0 Charles Tsai over 2 years ago

TI__Guru**** 191486 points

Hi,

- There are can_tx and can_rx examples in C:\ti\TivaWare_C_Series-2.2.0.295\examples\peripherals\can folder. Did you try these examples especially for the RX side on your PCB2? I will suggest you first start with the examples as these examples are proven to work. Once you get the examples working, you can adapt to your own application requirements.

- Do you have CAN transceiver for each node on the PCB? I suppose you have as this is needed for the CAN bus to work.

- Do you have proper termination resistor (e.g. 120ohm) for each node on the PCB? https://www.kvaser.com/developer-blog/how-to-test-your-can-termination-works-correctly/#:~:text=It%20is%20well%20known%2C%20in,each%20end%20of%20the%20bus.

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TM4C1294NCPDT: CAN transmit Message pending