TMS320F280049M: F280049 LIN-SCI register

Simen Biao

Part Number: TMS320F280049M

Hi ,

F280049 Lin bus SCI can be used to communicate with PC.

But

1. Driverlib user guide shows "Bitrate = (SYSCLOCK/2) / ((P + 1 + M/16) ∗ 16)", and real result is "Bitrate = (SYSCLOCK) / ((P + 1 + M/16) ∗ 16)",

LINCLK is SYSCLOCK , not SYSCLOCK/2.

2.Lin bus register does not match setup.(as below picture)

No matter what setup with BRSR and SCIGCR1, no value shows on them.

Any suggestion with above two topic?

thanks,

best regards,

Simen

over 7 years ago

0 Baskaran Chidambaram over 7 years ago

TI__Genius 17370 points

Hello,
I am writing to let you know that a C2000 team member has been assigned to this post and should be answering shortly.

Regards
Baskaran

0 Nirav Ginwala over 7 years ago

TI__Genius 15385 points

Hi Simen,

Yes, your assumption is correct. LINCLK=SYSCLK. We will get that changed in the driver lib user guide.

On your second question, do not use debugger expression / register window for SCI registers, since they do not display the contents correctly. The only way to verify the content got programmed correctly is to read the registers back from your code.

Regards,
Nirav

0 Simen Biao over 7 years ago in reply to Nirav Ginwala

Expert 1875 points

Hi Nirav,

Thanks for your answers.

best regards,
Simen

0 Wayne Huang over 7 years ago in reply to Simen Biao

TI__Genius 15035 points

Nirav,

I am asking this for customers.

We are confused.
Would you please make it clearer on "do not use debugger expression / register window for SCI registers, since they do not display the contents correctly"?

Does it mean do not use CCS debug watch window for
1) only this LIN/UART submodule?
2) both LIN/UART and conventional SCI submodules?

Why is there such limitation?

Wayne

0 Nirav Ginwala over 7 years ago in reply to Wayne Huang

TI__Genius 15385 points

Hi Wayne,

The issue is only applicable to LIN module. It has to do with byte bus bridge on LIN. We are looking into this and plan is to provide customer with an option using Memory browser to be able to view the contents of the Register that reflect the data which gets programmed. Right now address offset for LIN is byte wise, while CPU is 16bit hence the content displayed on Expression window on debugger is different.

Regards,
Nirav

0 Wayne Huang over 7 years ago in reply to Nirav Ginwala

TI__Genius 15035 points

Nirav,

I understand.
Thank you for your information.

Wayne

0 Christopher Chiarella over 7 years ago in reply to Wayne Huang

TI__Mastermind 30255 points

Wayne

As mentioned offline, CCS device support package v4.2.1.0 is now available via CCS update.

This includes fixes for:

(1)Viewing LIN registers in the "Registers" window
(2)Moves LIN to the periphal page in the Memory Browser (CAN as well).

Here's a screenshot on switching to the peripheral page and viewing LIN there.

Best regards

Chris

C2000™︎ microcontrollers

C2000 microcontrollers forum

TMS320F280049M: F280049 LIN-SCI register