Neil,

Here is a routine I wrote awhile back that generates even parity.

; Subroutine - Generate even parity for contents of W register. Parity bit
is returned
;              in bit 0 of parity register.
;
even_parity     mov     parity,w                ;This routine will leave the
parity of
                mov     w,<>parity              ; PARITY register in
PARITY.0
                xor     parity,w
                mov     w,>>parity
                xor     parity,w
                snb     parity.2
                inc     parity
                retp

In the send_byte subroutine, you'll need to insert the following line to
properly setup the parity bit.

                movb    tx_high.7,parity.0      ;Load parity bit into frame

I never got around to writing the receive code, but these routines could be
used there too.

Stephen

-----Original Message-----
From: Neil Gandler [mailto:neil_gandler@GETMAI.COM]
Sent: Wednesday, January 10, 2001 4:58 PM
To: PICLIST@MITVMA.MIT.EDU
Subject: [SX]: Looking for modified UART virtual peripheral (parity
bit/parity decode, framing error detect)


I am using an SX28 microcontroller, including the UART virtual peripheral.
If someone has modified the VP
to detect and decode a 9th parity bit and framing error, I would appreciate
the forwarded source code.
I am sure its easy to do, yet if someone has proven source code, it would
save me time.
Thanks

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