Dumitru Stama wrote:
> I have been using rs232 without any handshake but calculations of
> spbrg were my first mistake. I made a simple php calculator and this
> is what i got for your 13.5MHz frequency :

Even better is to let the assembler do the computation at assembly time from
more human-relevant constants in your source code.  This is what my
UART_BAUD macro in STD.INS.ASPIC at http://www.embedinc.com/pic does.  You
previously define the oscillator frequency with FREQ_OSC, you pass the
desired baud rate to the macro, and it computes the UART setup for you
automatically.  It even gives you a warning when the error gets to 1/4 bit
time at the last bit, and a error if it gets to 1/2 bit time.


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