Moving peripheral pins

Log in or register to post comments
Go To Last Post
4 posts / 0 new
Author
Message
JamesLS
JamesLS's picture
Level: Wannabe
Joined: Tue. Sep 11, 2007
Posts: 81 View posts
Location: Vancouver, BC
#1
Posted by JamesLS: Wed. Aug 20, 2008 - 02:12 AM
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Hi all,

Perhaps a simple/obvious question, but can I move the pins a peripheral is attached to? I would like to connect one of the USARTs to pins PB00,PB01 etc.. I'm not using SPI1 and would rather have a USART there connecting to the onboard CPLD.

Unfortunately the other USART pins aren't connected to the CPLD of interest..

Possible?

Thanks!

~James

Tags:

AVR Microcontrollers, AVR UC3
Top
hce
hce's picture
Level: Raving Lunatic
Joined: Tue. Jan 7, 2003
Posts: 4582 View posts
Location: Oslo, Norway
Posted by hce: Wed. Aug 20, 2008 - 07:43 AM
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

No, you can not move the pin multiplexing, take a look in the datasheet to see how the multiplexing is done. It should be in the peripherals section, in AP7000 that list starts on page 82.

Hans-Christian

Top
squidgit
squidgit's picture
Level: Raving Lunatic
Joined: Sun. Sep 14, 2003
Posts: 4228 View posts
Location: Queanbeyan, Australia
Posted by squidgit: Wed. Aug 20, 2008 - 01:19 PM
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

AFAIK only OMAP2 has a many-to-many pinmux setup and they dropped that when they realized just what a right royal pita it was for all involved.

That said, if it's just a usart you want on those pins then, depending on baud, you can probably bit-bang it over gpio eh?

-S.

Blag: http://www.niasdigital.com/blag

Top
JamesLS
JamesLS's picture
Level: Wannabe
Joined: Tue. Sep 11, 2007
Posts: 81 View posts
Location: Vancouver, BC
Posted by JamesLS: Wed. Aug 20, 2008 - 06:04 PM
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Thanks guys, I was having a look in the datasheet after posting that and was suspecting it isn't possible. Good to have confirmation though!

Bit-banging is definitely an option, however by lucky chance it seems that USART0 actually does come out to test points, so I figure I can just bridge it across with jumper wires to the CPLD device. I had been looking at an older version of the schematic that didn't have the test points..

Thanks again!

Top