LAUNCHXL2-570LC43: CAN Communication Not Working Between Two LAUNCHXL2-570LC43 Boards (Loopback Works Fine)

Tool/software:

Hello everyone,

I have successfully tested the CAN loopback example on a single LAUNCHXL2-570LC43 board, and it works perfectly. The loopback code transmits and receives CAN messages internally without any issues.

Now, I am trying to establish CAN communication between two separate LAUNCHXL2-570LC43 boards using the same code and HALCoGen configurations. However, the communication does not work as expected — no messages are being received on either side.

What I have done so far:

• Verified that both boards have the same CAN bit timing and baud rate configuration.

• Confirmed that the CAN transceivers are properly connected to the CAN_H and CAN_L lines. I am using TD5(3)21DCANH Transceiver.

• Checked power and ground connections between the two boards.

• I am using CAN1 MessageBox1 for Transmission and Reception on both side.

• All the connections are perfect from my side and I haven't changed anything else on HALCoGen.

What I observe:

• CAN RX controller remains stuck in initialization mode (INIT bit stays set).

• No CAN messages are received on the receiving board.

• Loopback mode on a single board works fine, indicating the basic CAN module setup is correct

Questions:

• Are there any additional steps required to enable CAN communication between two LAUNCHXL2-570LC43 boards?

• Could this issue be related to hardware wiring, CAN transceiver setup, or HALCoGen configuration?

• Any suggestions or known issues to check?

With Regards 

/* This is my Transmitter side code */

#include "HL_sys_common.h"
#include "HL_can.h"

#define D_SIZE 9

uint8 tx_data[D_SIZE] = {'R','A','D','H','A','\0'};
uint8 rx_data[D_SIZE] = {0};

void delay_2s(void)
{
    volatile unsigned long i;
    for (i = 0; i < 600000000; i++);
}

int main(void)
{
    canInit();
    while (1)
    {
        canTransmit(canREG1, canMESSAGE_BOX1, tx_data);
        delay_2s();
    }

    return 0;
}


/* This is my Receiver Side Code */

#include "HL_sys_common.h"
#include "HL_can.h"

#define D_SIZE 9

uint8 rx_data[D_SIZE] = {0};

void delay_2s(void)
{
    volatile unsigned long i;
    for (i = 0; i < 600000000; i++);
}

int main(void)
{
    canInit();
    while (1)
    {

        if (canIsRxMessageArrived(canREG2, canMESSAGE_BOX1))
        {
            canGetData(canREG1, canMESSAGE_BOX1, rx_data);
        }
        delay_2s();
    }

    return 0;
}