TMS570LS3137: CAN messages lost

Hello,

Whenever the CAN bus is free, any unit may start to transmit a message. If 2 nodes start transmitting messages at the same time, the bus access conflict is resolved by bitwise arbitration using the ID. Do you use the same ID for 2 TX MSG boxes? 

Hello,

No, I use different ID for the 2 TX MSG boxes. I use the function updateID provide by HALCoGen. In the configuration I configure the TX boxes with different IDs.

Best regards

Hello.

I have configured 2 mailboxes for input data and 2 mailboxes for output data in both CAN with fixed IDs. I send CAN frames every 10ms, and I can check that if I have a priority message in other mailbox (lower ID), it discard other messages. How is this possible if the busload is 10%?

Thanks in advance,

Best regards

Hello,

Thanks for reply. How can i create a single queue for TX? Thanks

Instead of calling "canTransmit"; load the three parameters for canTransmit into arrays. Then loop to send the array values, but wait until the tx queue has no pending tx on either mailbox ID

Hello,

I use this code to create the queue:

	while (1) {
	    for(i = 0; i < 50; i++) {
	        if(txFrames[0][i] == 1)
	        {
	            while(canTransmit(canREG1, txFrames[1][i], &txFrames[2][i]) == 0);
	            txFrames[0][i] = 0;
	        }
	        else if(txFrames[0][i] == 2)
	        {
	            while(canTransmit(canREG2, txFrames[1][i], &txFrames[2][i]) == 0);
	            txFrames[0][i] = 0;
	        }
	    }
	}

I fill the txFrames data in the canMessageNotification function. The problem persists with this code. Any suggestions?

Thanks in advance