TMS320F28379D: Can Bus Example code

sagar shah54

Expert 2125 points

Part Number: TMS320F28379D
Other Parts Discussed in Thread: C2000WARE

Hello I am trying to test can bus code can_external_transmit.c.

So it says i have to have external connections which I do-

Is this correct -

Gpio8 (can txB) connected to Gpio 31(CAN -L on j12 ) ?

Gpio 10(can rxb) connected to Gpio 30 can RXA (CAN H)?

I am just starting to understand the protocol of CAN so not sure if this is correct for testing the code mentioned above?

over 6 years ago

0 Hareesh Janakiraman over 6 years ago

TI__Guru* 95315 points

You need a transceiver to achieve communication. Please take a look at SPRA876 for the wiring diagram and the schematics in C:\ti\c2000\C2000Ware_1_00_06_00\boards\LaunchPads\LAUNCHXL_F28379D\R2.0. Once you have this, you need to connect CAN_H of the two transceivers together. Likewise with CAN_L.

0 sagar shah54 over 6 years ago in reply to Hareesh Janakiraman

Expert 2125 points

Gpio 30 and Gpio 31 on J12? You mean transceiver from Gpio 8 and Gpio 10?

0 Hareesh Janakiraman over 6 years ago in reply to Hareesh Janakiraman

TI__Guru* 95315 points

For general information about the protocol itself (which is not covered in our documentation), there are excellent resources online.

Wikipedia & many videos on YouTube cover the protocol extensively.
Good resource for a tutorial is https://www.kvaser.com/about-can/the-can-protocol/ .
I have benefited immensely from reading the book “A Comprehensible Guide to Controller Area Network” by Wilfried Voss.
There are also good Application Notes on our website. You can find them listed in the References section of my own app.note SPRA876. I especially urge you to look at http://www.ti.com/lit/an/slyt529/slyt529.pdf and http://www.ti.com/lit/an/sloa101b/sloa101b.pdf

0 Hareesh Janakiraman over 6 years ago in reply to sagar shah54

TI__Guru* 95315 points

Every pair of CAN pins (CANTX & CANRX) needs its own transceiver. Please go through the links I have provided to understand the basics of the CAN physical layer.

0 Hareesh Janakiraman over 6 years ago in reply to Hareesh Janakiraman

TI__Guru* 95315 points

It appears you rejected the answer. Please clarify why you did so.

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TMS320F28379D: Can Bus Example code