can_loopback example

Tanja Nowitzki

Hello,

I'm trying to implement a CAN connection on an F28M35H52C1 controller (on control card). I found the can_loopback example for the M3 and it works just fine. The signal at the Tx pin can be detected on a scope. If I remove the following line: "HWREG(CAN0_BASE + CAN_O_TEST) = CAN_TEST_EXL;" the controller doesn't receive its messages (as expected), but there is also no more signal at the Tx pin (which I don't understand).

Can you give me a hint on how to implement the connection correctly without test mode?

Is there a CAN example using TIRTOS?

Thank you for your efforts!

Best regards

Tanja

over 9 years ago

0 Steven Connell over 9 years ago

TI__Mastermind 45025 points

Hi Tanja,

There is no CAN example for TI-RTOS.

I'll see if I can get your post moved to a forum where someone can help you with CAN.

Steve

0 Tanja Nowitzki over 9 years ago in reply to Steven Connell

Prodigy 50 points

Hi Steve,

thank you for your quick reply! I see my question is still in the TI-RTOS forum. But never mind, I've just found out that someone had a similar problem which is discussed in a post called "Concerto F28M35x - can_loopback_m3 Bit Rate". I didn't realize it at the first time because the initial question is about changing the bitrate. I will try the steps which are suggested there.

Is there a way for me to move my post to another forum? Just in case I need this later.

Tanja

0 David Friedland over 9 years ago in reply to Tanja Nowitzki

TI__Mastermind 18320 points

Tanja,

Per your request, I have moved this thread over to the C2000 forum.

0 Hao Wang over 9 years ago

Intellectual 360 points

Hello Tanja,
I also want to use can on Concerto device, did you figure out how to use without test mode? and how to receive CAN message?
Thanks.

Hao

0 Tanja Nowitzki over 9 years ago in reply to Hao Wang

Prodigy 50 points

Hello Hao,

the hardware I used had a little bug. The GND pin of the CAN-transceiver wasn't connected. All I had to do was to connect the supply voltage of the CAN transceiver correctly. I guess the CAN driver of the Concerto checks, if there's a transceiver connected to the Rx and Tx pins. If there's no transceiver, normal mode doesn't work.

Best regards,
Tanja

0 Hao Wang over 9 years ago in reply to Tanja Nowitzki

Intellectual 360 points

Thanks for reply Tanja. I have the CAN transceiver converting Rx Tx to CANL,CANH. I just had the receiving working earlier this week, by adding RX interrupt clear message in the CAN interrupt handler. It works perfect now.

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can_loopback example