TMS320F28379D: CAN Simple Transmit and Receive Examples - TI Microcontroller TMS32028379D

Josh Navarro

Part Number: TMS320F28379D
Other Parts Discussed in Thread: C2000WARE

I'm not sure if I am doing this right, but I have connected two launchpads to separate workspaces to execute the simple transmit and receive examples. However I am unsure why the loop below is not executing.

while(((HWREGH(CANA_BASE + CAN_O_ES) & CAN_ES_TXOK)) != CAN_ES_TXOK)

I configured the debuggers by serial number based on a tutorial I found online. In terms of wiring the nodes, is it correct to physically connect CANH to CANH and CANL to CANL for each microcontroller?

over 3 years ago

0 Hareesh Janakiraman over 3 years ago

TI__Guru* 95315 points

Josh,

I suggest you try this with two different PCs first. Once it works, you can then use the same PC. This is basically to eliminate CAN issues Vs CCS issues.

I suggest you look my debug tips in www.ti.com/lit/SPRACE5.

Josh Navarro said:
In terms of wiring the nodes, is it correct to physically connect CANH to CANH and CANL to CANL for each microcontroller?

Yes, and don't forget to connect the grounds of the two boards together. Again, SPRACE5 explains this.

0 Hareesh Janakiraman over 3 years ago in reply to Hareesh Janakiraman

TI__Guru* 95315 points

Here are some helpful CAN resources:

I have created a video to help with the first communication project using DCAN: https://training.ti.com/getting-started-dcan-module. Please take a look.

The TRM chapter explains the CAN protocol implementation in the MCU. i.e. it explains the functions of the various registers/bits. However, it does not explain the protocol itself. For protocol information, refer to these excellent videos:

https://training.ti.com/automotive-can-overview

https://training.ti.com/ti-precision-labs-canlinsbc-can-and-can-fd-protocol?context=1139747-1138099-1139707-1138111

https://training.ti.com/ti-precision-labs-canlinsbc-can-and-can-fd-overview?context=1139747-1138099-1139707-1138109

https://training.ti.com/ti-precision-labs-canlinsbc-can-physical-layer?context=1139747-1138099-1139707-1138110

0 Josh Navarro over 3 years ago in reply to Hareesh Janakiraman

Prodigy 20 points

For the F28379D there is only can_ex4_simple_transmit and can_ex5_simple_receive. Neither of those files require commenting out the TRANSMIT definition as seen in the video. I have both programs running in separate workspaces with the launchpads connected properly now, but the receive program is not acquiring the message in rxMsgData. What needs to be done to complete the message transmission?

0 Hareesh Janakiraman over 3 years ago in reply to Josh Navarro

TI__Guru* 95315 points

Josh,

Is the transmit-side code working now? If not, did you review the debug tips in SPRACE5? These are tested examples that should pretty much work out of the box.

0 Josh Navarro over 3 years ago in reply to Hareesh Janakiraman

Prodigy 20 points

Hareesh,

The transmit side is working. I can see the TxMsgData fill in under Watch Expressions. RxMsgData for the receive side is not updating after running each program.

0 Josh Navarro over 3 years ago in reply to Josh Navarro

Prodigy 20 points

Additionally, both sides of the code (transmit and receive) are reading:

"../lab_main.c", line 105: warning #225-D: function "SysCtl_allocateSharedPeripheral" declared implicitly
"../lab_main.c", line 105: error #20: identifier "SYSCTL_PALLOCATE_CAN_A" is undefined
"../lab_main.c", line 106: error #20: identifier "SYSCTL_PALLOCATE_CAN_B" is undefined

I cannot find which header file is supposed to include this specific sysCtrl identifier. If you could help with that too I would appreciate it.

0 Hareesh Janakiraman over 3 years ago in reply to Josh Navarro

TI__Guru* 95315 points

Transmit side uses an extended ID of 0x15555555. Receive side uses a standard ID of 0x1. That is why receive is not working. I have clearly explained this in SPRACE5: " When attempting to initiate communication on the bus for the very first time, ensure that the mailbox in the transmitting node and the receiving node are programmed with the same MSGID"

Please install the latest version of C2000ware (Version: 4.03.00.00) and try out the examples there.

0 Josh Navarro over 3 years ago in reply to Hareesh Janakiraman

Prodigy 20 points

I have the newest version installed, and both the MSIDs read 0x15555555 for transmit and receive on the script. The script stops executing at the while(txMsgSuccessful) loop.

0 Hareesh Janakiraman over 3 years ago in reply to Josh Navarro

TI__Guru* 95315 points

If the Transmit succeeds, that indicates there is no H/W issue and connection between the boards are good. Please use the debug tips in SPRACE5 to debug this. I am afraid I cannot help further.

0 Josh Navarro over 3 years ago in reply to Hareesh Janakiraman

Prodigy 20 points

Can you please link the file location for the transmit_receive project? I was only able to find the c file, not an entire project. So I had to use an empty project for the F28379D and add the c file to run the program.

0 Hareesh Janakiraman over 3 years ago in reply to Josh Navarro

TI__Guru* 95315 points

You can import the projects from C:\ti\c2000\C2000Ware_4_03_00_00\driverlib\f2837xd\examples\cpu1\can\CCS.

You should import can_ex4_simple_transmit and can_ex5_simple_receive. When you import the projects through CCS, it will import the entire project.

0 Josh Navarro over 3 years ago in reply to Hareesh Janakiraman

Prodigy 20 points

Hi Hareesh,

I got the transmission to work. I would like to now attempt this communication with three controllers. I think I understand how that can be done via CCS, but not in terms of the pin connections.

0 Hareesh Janakiraman over 3 years ago in reply to Josh Navarro

TI__Guru* 95315 points

Josh,

Please take a look at Figure 1-1 on page 2 of www.ti.com/lit/SPRACU9.

C2000™︎ microcontrollers

C2000 microcontrollers forum

TMS320F28379D: CAN Simple Transmit and Receive Examples - TI Microcontroller TMS32028379D