TMS320F28027: Communicating using two separate UART modules

Ariel Pickholz26

Intellectual 1295 points

Part Number: TMS320F28027

Hi All ,

My customer have asked the following :

Is it possible to communicate with two separate UART modules ?

(We would need to support two separate RS485 buses in a systemat the same time using this specific Piccolo model).

For instance using these two pairs of pins

Please advise soon ,

Best regards ,

Arik.P.

AFAE

over 7 years ago

0 Sudharsanan over 7 years ago

TI__Expert 5240 points

Hello,

Can you please upload the the image/reference below the text "two pairs of pins"? It is not visible?

0 Ariel Pickholz26 over 7 years ago in reply to Sudharsanan

TI__Intellectual 1295 points

Hello ,

I will try to re-attach.

Best regards ,

Arik.P.

0 Ken Schachter over 7 years ago in reply to Ariel Pickholz26

TI__Genius 17315 points

Arik,

First, I hope that you realize that this device only has one SCI. Each GPIO pin can have up to four options - I/O and up to three possible peripheral functions. The figure that you attached shows the one SCI TX and RX is multiplexed (pinned out) to two different GPIO locations.

I hope this helps. If this answers your question, please click the green "Verified Answer" button. Thanks.

- Ken

0 Ariel Pickholz26 over 7 years ago in reply to Ken Schachter

TI__Intellectual 1295 points

Hi ,

So with single SCI this processor can’t handle two i stances of UART.

Please confirm.

BR ,

Arik.P

0 Ken Schachter over 7 years ago in reply to Ariel Pickholz26

TI__Genius 17315 points

Arik,

It's a single physical SCI which has two PIE interrupt vectors - one for RX and one for TX. The key words here are "single physical" and not a software "instance". Time-sharing is not very practical, if even possible. This would involve managing a lot of software overhead and code, making it extremely slow.

I hope this answers your question and if so, please click the green "Verified Answer" button. Thank you.

- Ken

0 Ariel Pickholz26 over 7 years ago in reply to Ken Schachter

TI__Intellectual 1295 points

Hi Ken ,
Thank you.

Can you please recommend an alternate Picollo member device that supports dual UART natively ?

Best regards ,

Arik.P

0 Ken Schachter over 7 years ago in reply to Ariel Pickholz26

TI__Genius 17315 points

Arik,

I suggest looking at:

www.ti.com/.../products.html

This will help you select a device based on features and budget (approximate price per 1 ku).

I hope this helps. If this answers your question, please click the green "Verified Answer" button. Thanks.

- Ken

C2000™︎ microcontrollers

C2000 microcontrollers forum

TMS320F28027: Communicating using two separate UART modules