Project DCAN_RX not working

Hi Lee,

The TMS570LC43x launchpad doesn't include CAN transceiver, so the launchpad can not be connected to CAN network directly. 

There are many CAN transceiver adaptor in the market:

https://www.robotshop.com/en/waveshare-can-board-sn65hvd230.html?gclid=Cj0KCQjwwNWKBhDAARIsAJ8Hkhfo2ZQJREVt58U56YbK3OqTJ_RLHIKytmzgPy4KEQQ0Iknz2rsaFvEaArnCEALw_wcB

You can plug this kind of small adaptor onto the launchpad.

When TMS570 CAN transmits data, is the data appeared on the CAN bus? The waveform on the CAN_H and CAN_L look like:

If you see the correct transmitted message waveform on the CAN bus, the CAN receiver may not be configured correctly to get the data. 

Hi, QJ Wang,

Thank you for quick response.

I use another TMS570LC43x launchpad with transceivers connected.

DCAN 3 as transmitter to transmit data and DCAN 4 as receiver to receive data, but receiver doesn't get the data.

DCAN 3 transmits data to the registers DCAN IF1DATA and DCAN IF1DATB. How to make sure that data are go to pin Tx?

The codes: 

uint32 canTransmit(canBASE_t *node, uint32 messageBox, const uint8 * data)

{

      node->IF1DATx[i] = *data;

}

DCAN 4 receives data from 

uint32 canIsRxMessageArrived(canBASE_t *node, uint32 messageBox)

{

     flag = node->NWDATx[regIndex] & bitIndex;

}

flag has never be set, so codes are loop here infinitely in while loop in main().

uint32 canGetData(canBASE_t *node, uint32 messageBox, uint8 * const data)

{

     *pData = node->IF2DATx[s_canByteOrder[i]];

}

int main(void)
{
      /* USER CODE BEGIN (3) */
      canInit(canREG3); // Initialize the CAN Module Channel3
      canInit(canREG4); // Initialize the CAN Module Channel4

      canTransmit(canREG3, canMESSAGE_BOX1, tx_data); // Transmit data through Msg Box1 of CAN3

      while(!canIsRxMessageArrived(canREG4, canMESSAGE_BOX1)); // Wait till a message is received on CAN4, Msg Box1
      canGetData(canREG4, canMESSAGE_BOX1, rx_data); // Store the received data in rx_data

       error = checkPackets(&tx_data[0], &rx_data[0], D_SIZE); // Check if the message received is same as expected

        while(1); // Infinite Loop
/* USER CODE END */
}

Thanks,

F