TMS320F28379D: CAN message ID's

berkantgulen

Part Number: TMS320F28379D

Hi everyone,

i'm using the C2000 Launchpad XL to receive and transmit messages via CAN.

The problem i'm facing is the possible message ID's. I set up message boxes as follows;

CAN_setupMessageObject(CANB_BASE, CO_MSG_OBJ_ID_RX_TPDO1, CO_COB_ID_TPDO1,
CAN_MSG_FRAME_STD, CAN_MSG_OBJ_TYPE_RX, CO_COB_ID_T_MASK,
CAN_MSG_OBJ_RX_INT_ENABLE | CAN_MSG_OBJ_USE_ID_FILTER,
CO_MSG_DATA_LENGTH_TPDO);

Note:

* CO_MSG_OBJ_ID_RX_TPDO1 = 21

* CO_COB_ID_TPDO1 = 0x180

* CO_COB_ID_T_MASK = 0xF80

And i can get messages from different nodes 0x181, 0x182, 0x183...

But when i read the coming data with function, I only know object ID (21, 22, 23 etc.). I can not get message id.

I'm using C2000 Ware drivelib. How can i find which message id (node id) came?

over 5 years ago

0 Baskaran Chidambaram over 5 years ago

TI__Genius 17370 points

Looks like the driverlib is not providing any API to get the node id. I will check if there is any option and get back.

Regards

Baskaran

0 berkantgulen over 5 years ago in reply to Baskaran Chidambaram

Prodigy 110 points

Yes i can not find any API to get message ID in driverlib. I try to find in CanxRegs register, but there is nothing about message ID.

If i can find something, will give you information too.

Regards,

Berkant

0 Christopher Chiarella over 5 years ago in reply to berkantgulen

TI__Mastermind 30255 points

Hello

Modify the CAN_readMessage() API where at the first line with "HWREG_BP" add in an ORing of CAN_IF2CMD_ARB as well. This will then transfer the message ID into the interface register.

This is currently an open issue on our end.

Best regards

Chris

0 berkantgulen over 5 years ago in reply to Christopher Chiarella

Prodigy 110 points

Hi,

I applied the change you said. I modified inside of CAN_readMessage() in the following way.

HWREG_BP(base + CAN_O_IF2CMD) =
((uint32_t)CAN_IF2CMD_DATA_A | (uint32_t)CAN_IF2CMD_DATA_B |
(uint32_t)CAN_IF2CMD_CONTROL | (objID & CAN_IF2CMD_MSG_NUM_M) | CAN_IF2CMD_ARB);

Then i try to get message id as follows in interrupt function. But still can not find message id.

uint32_t id = HWREG_BP(CANB_BASE + CAN_O_IF2CMD);

And i tried another register "CAN_O_IF2ARB". Both of them not working to get message ID. :/

I hope you solve the problem as soon as possible. I think an API is required. :)

Regards

Berkant

0 Christopher Chiarella over 5 years ago in reply to berkantgulen

TI__Mastermind 30255 points

Hello

The ID will be in the IF2ARB register not the IF2CMD. Make sure you are rebuilding the driverlib to use your modified can.c

The ID will be in bits 28-0 (possibility only bits 28:18 if using standard frame ID and will require shifting).

Best regards

Chris

0 berkantgulen over 5 years ago in reply to Christopher Chiarella

Prodigy 110 points

Hi Christopher,

I'm sorry for the late reply. I was on vacation.

I was rebuilding can.c library wrong. Now it's working correctly. Thank you so much.

By the way thanks for helps Baskaran.

Best Regards

Berkant

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TMS320F28379D: CAN message ID's