TMS570LS1224: CAN Loopback Tests

Yes, you can use loopback to check the acceptance filtering.  

Hi, Thank you for your reply. I did tried this yesterday and hence I wrote the mail. It seems not working. Not sure Where I am going wrong.
I had set the controller in loop back mode with :
canEnableloopback(canReg1, Internal_Lbk);

In Halcogen had set the Message 14 in Tranmsit node.
I had set the mask as 0x00000000 and ID as 0x119 generated the code.

I has sent the message with:
Can ID - 0x120
CAN message box number - 14 (same as transmit since it s a loop back mode.
and data bits.

But it seems to accept the messsage and I can see the receive message via loopback.  I was expecting it to reject the loop back transmit message.

Is this the expected way of working or I am doing any thing wrong here ?

Please use different message box for receive.

If msk[28:0]=0x0000000, the identifier of the message object is not used for acceptance filtering, this message box can receive message with different IDs.

for example, Msg box1 transmits data with ID=119

Msg box3 transmits data with ID=121

Msg box5 transmits data with ID=123

The Message Box 2 is configured to receive data, the msk of this object is 0x0000. This msg box will receive data from msg box 1, 3, and 5.

#define D_SIZE 8

uint8 TX_DATA1[D_SIZE]={1,2,3,4,5,6,7,8}; /* transmit buffer in sys ram */
uint8 TX_DATA2[D_SIZE]={11,12,13,14,15,16,17,18}; /* transmit buffer in sys ram */
uint8 TX_DATA3[D_SIZE]={21,22,23,24,25,26,27,28}; /* transmit buffer in sys ram */
uint8 RX_DATA1[D_SIZE]= {0}; /* receive buffer in sys ram */
uint8 RX_DATA2[D_SIZE]= {0}; /* receive buffer in sys ram */
uint8 RX_DATA3[D_SIZE]= {0}; /* receive buffer in sys ram */

uint32 CAN_Comp_Flag = 0xAAAA5555;
/* USER CODE END */

int main(void)
{
/* USER CODE BEGIN (3) */
/* initialize can 1 */
_enable_IRQ_interrupt_();

canInit();

canEnableloopback(canREG1,Internal_Lbk);

/* transmit on can1 */
canTransmit(canREG1, canMESSAGE_BOX1, TX_DATA1);

/* Wait for the DMA interrupt ISR to set the Flag */
while(CAN_Comp_Flag != 0x5555AAAA);

/* Reset the Flag */
CAN_Comp_Flag = 0xAAAA5555;

/* transmit on can1 */
canTransmit(canREG1, canMESSAGE_BOX3, TX_DATA2);

/* Wait for the DMA interrupt ISR to set the Flag */
while(CAN_Comp_Flag != 0x5555AAAA);

/* Reset the Flag */
CAN_Comp_Flag = 0xAAAA5555;

/* transmit on can1 */
canTransmit(canREG1, canMESSAGE_BOX5, TX_DATA3);

/* Run forever */
while(1);

/* USER CODE END */

return 0;
}

/* USER CODE BEGIN (4) */
void canMessageNotification(canBASE_t *node, uint32 messageBox)
{
    CAN_Comp_Flag = 0x5555AAAA;
    if(node==canREG1)
    {
         canGetData(canREG1, canMESSAGE_BOX2, (uint8 * )&RX_DATA1[0]); /* copy to RAM */
    }
}

Thank you very much for your support. It has helped me very much.