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Auto baud detection algoritm

 
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mesuty
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Auto baud detection algoritm
PostPosted: Sat Apr 23, 2005 2:20 am     Reply with quote
Hi friends;

Did somebody work before on automatic baudrate detection in PIC 18xxx series of MCUs.

My baudrate range is between 9600-115200 . What is the logic behind the automatic baud rate sensing.

Could somebody give me a light )

Thanks.
Humberto



Joined: 08 Sep 2003
Posts: 1215
Location: Buenos Aires, La Reina del Plata

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PostPosted: Sat Apr 23, 2005 8:10 am     Reply with quote
1) Calculating the edges time interval

http://ww1.microchip.com/downloads/en/AppNotes/00962a.pdf

2) Searching for a Bit pattern recognition:

http://www.iol.ie/~ecarroll/autobaud.html

Humberto
Mark



Joined: 07 Sep 2003
Posts: 2838
Location: Atlanta, GA

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PostPosted: Sat Apr 23, 2005 12:43 pm     Reply with quote
There is also a boot loader for the PIC on Mircochip's website that has an autobaud routine in it.
Humberto



Joined: 08 Sep 2003
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PostPosted: Sat Apr 23, 2005 12:51 pm     Reply with quote
Also if the PIC 18xxx you are using have hardware EUART you can use:

setup_uart(UART_AUTODETECT);

and will sets the UART baud rate to match.
I never use it.

Humberto
Neutone



Joined: 08 Sep 2003
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Re: Auto baud detection algoritm
PostPosted: Tue Apr 26, 2005 3:47 pm     Reply with quote
mesuty wrote:
Hi friends;

Did somebody work before on automatic baudrate detection in PIC 18xxx series of MCUs.

My baudrate range is between 9600-115200 . What is the logic behind the automatic baud rate sensing.

Could somebody give me a light )

Thanks.


I posted an example that uses framing errors to know the baud rate is wrong. Starting at the highest baud rate and reducing the baud rate until the correct baud rate is found.
http://www.ccsinfo.com/forum/viewtopic.php?t=19306
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