Olin Lathrop wrote:
> Good thing you're using a high level language that makes this sort of 
> thing
> so easy to read.  This is much more obscure in my equivalent assembler
> module.

I can't tell for sure, but I think you're being sarcastic. :-)

> At the top the baud rate is defined:
>
> baud     equ     115200      ;serial line baud rate
>
> Then in the derived constants section a macro is envoked that is passed 
> the
> baud rate and knows the oscillator frequency from a global assembly time
> constant.  This macro figures out which flavor of UART the PIC has, what 
> the
> optimal baud rate configuration is given the desired baud rate and the
> oscillator frequency, and checks to make sure it is close enough for
> reliable communication:
>
>         uart_baud baud      ;set asm constants for UART configuration
>
> Then in the module init routine another macro is envoked that takes the
> state computed by the UART_BAUD macro and stuffs it in the appropriate
> registers:
>
>         uart_setup          ;init to config from UART_BAUD, above
>
> The three lines of code above were copied directly from the QQQ_UART.ASPIC
> template module.  The macros are defined in STD.INS.ASPIC.  Both are part 
> of
> my PIC development environment described at http://www.embedinc.com/pic,
> which can be downloaded for free from 
> http://www.embedinc.com/pic/dload.htm.

So how would you change the baud rate, at run-time? In C, it's:

    Uart_SetBaudRate(9600);

Vitaliy 

-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist