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Automatic baud rate and data direction dedection

 
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gokhangs



Joined: 22 Nov 2004
Posts: 2
Location: İstanbul

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Automatic baud rate and data direction dedection
PostPosted: Mon Nov 29, 2004 7:51 am     Reply with quote
Hi. I have a problem. I think you help me to solve my problem. I want to design a RS-232 to RS-485 converter but I don't want to use RTS pin of RS-232 port so I have to develop an algorithm which dedects baud rate and data direction automatically. I couldnt find any document about an algorithm or code example which solves my problem. I am looking forward yor replies and advises. Thanks. Sad [color=blue][/color
Neutone



Joined: 08 Sep 2003
Posts: 839
Location: Houston

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PostPosted: Mon Nov 29, 2004 9:37 am     Reply with quote
Auto baud detection is not a problem.

http://www.ccsinfo.com/forum/viewtopic.php?t=19306
SherpaDoug



Joined: 07 Sep 2003
Posts: 1640
Location: Cape Cod Mass USA

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PostPosted: Mon Nov 29, 2004 11:23 am     Reply with quote
Beware, reliable auto-baud is tough if there is any noise on the transmission line. If possible have the source send a training character like "U" to aquire the baud rate by.
Beyond that just measure the lenght of the bits to find the shortest repeatable plausable time.
Another approach is to try a fast rate and go slower and slower until you stop getting framing errors.
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