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Changing baud rate on the fly

 
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Haplo



Joined: 06 Sep 2003
Posts: 659
Location: Sydney, Australia

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Changing baud rate on the fly
PostPosted: Thu Feb 26, 2004 6:04 am     Reply with quote
Hi
Can I use the set_baud_rate() to change the baud rate of a software serial port? Or does it only work with the hardware UART?
The manual says it is only for the hardware UART. In an application I have a software and a hardware UART with different stream identifiers, using the set_baud_rate() function with each of the indentifiers results in a different code (as in the .LST file), but it seems the software port doesn't change the speed.

Thanks.
PCM programmer



Joined: 06 Sep 2003
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PostPosted: Thu Feb 26, 2004 12:33 pm     Reply with quote
Quote:
Can I use the set_baud_rate() to change the baud rate of a software serial port ?

No.
The CCS library code for software USARTs doesn't have the ability
to change the baud rate. The baud rate is determined by inline code
with software delay loops or just NOPs, to create the appropriate
pulse widths. These delays are hard coded at compile time.

The solution is to use a separate #use rs232 statement for each
baudrate that you need for your software USART. This will cause
the compiler to generate a separate set of ASM code for each
baudrate. Here is a post that shows one way to do this:
http://www.pic-c.com/forum/old/messages/3188.html
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