TMS320F280049: CAN message TX fail

Hi Akihiko Fujinaka, 

Please describe the entire target environment (which board?, C2000Ware version, which example etc.,)  and customer objectives with CAN.  Please take a look at this application note as well.  http://www.ti.com/lit/an/spra876b/spra876b.pdf   

Thanks,

Krishna

Hello Krishna,

Here I received the answers.

 target environment: 

which board?: Customer deisgned board

C2000Ware version:  2_00_00_02

which example:  No example becuase customer original source code refeed can_ex3_external_transmit.c .

Their code send CAN data every 5msec using mailbox assinged different ID every time.

Regards, A.Fujinaka

If the message object is modified before the message TX is started, the new message is what is attempted to tx next. That means, if there are multiple nodes in the network and this node failed arbitration and failed to tx the message before the object is modified with new ID/data, the old ID/data in the message object is discarded. If needed, wait for the TX event before updating the MBOX.

Hello , Thanks for your feedback.

So, they should enable the TXInterrupt by "TxIE" set to "1" and wait for "IntPnd" turns to "1" showing successful transmission? 

Hello Krishna,

I communicated with my customer engineer and proposed to test with TxIE enable and wait for IntPnd bit check before sending the next object.

However, they don't want to add the TX interrupt handler because they are not using TX interrupt in their code now.

Are there any correct sequence of document or decsription to send  the object with CAN_sendMessage() after CAN_setupMessageObject().

Is this IntPnd bit check  necessary for the  sequential object sending? If that's the TI recommendation and only way, they might try to use TX INT handler.

Regards , A.Fujinaka

Hello expoerts,

Do you have any feedback on this question?

My customer is staill waiting for our reply.

Regards, A.Fujinaka

Hi Akihiko Fujinaka,

I have consulted with the domain expert and he will be responding to you today.  Cheers! Krishna

Fujinaka-san,

            Please have customer take a look at my app.note http://www.ti.com/lit/sprace5 ,if they have not already. How does the code ensure completion of the previous transmission before initiating the next transmission? (Joe Josn makes a good point. Kindly read his post carefully). If customer does not want to use interrupts (for whatever reason) and if this is the only mailbox that is transmitting, you could simply poll the TXOK bit in the CANES register. See CAN_EX4_SIMPLE_TRANSMIT project in my application report, for an example. Code snippet below:

        //
        // Poll TxOk bit in CAN_ES register to check completion of transmission
        //
        while(((HWREGH(CANA_BASE + CAN_O_ES) & CAN_ES_TXOK)) !=  CAN_ES_TXOK)
		{
		}

If there are multiple mailboxes that are transmitting, then a different method has to be used.