First thanks  for all the info for accessing text string, it seems there is
no easy way to do it.

I now have another problem I am using a 16c74 and have got to send the data
from the A/D down the serial port. I now want to do is to send it commands
(from a PC) and for the program the  to act on those commands.
The first thing I have tried is to get the program it to echo back what has
been sent down the serial line, but I cant get this to work! The program
sends data perfectly what I cant seem to get it to do is to recieve a byte
and then send it back. I have included part of the code below,
I know I am not checking for errors but I just want to  keep it simple to
start with ( maybe I cant..). If there are some obvious errors please show
me....
My 3 main question are
1) Do I check the RCIF bit to see if data is in the RCREG, or is there
another way?
2) Do I have to do anything else to read the RCREG, do I need to clear it
after wards?
3) Does anyone have a example bit of working code I could try!!

All help gratefully received.

Thanks

Mike Barrett


; start of code to echo back data from RX port to TX port
; data is 1 ascii character

        CALL    SERIAL_SETUP

A1                              ;START HERE
        BTFSS   PIR1,RCIF       ; SEE IF DATA IN BUFFER, SET IF DATA
        GOTO    NO_DATA
        MOVF    RCREG,W ; MOVE DATA INTO W
        MOVWF   TX_CHAR
        call    serial_send     ; byte in TX_CHAR this sub works
NO_DATA
        GOTO    A1              ; RETURN TO START OF LOOP

;
; SETUP SERIAL PORT AND BAUD RATE
;
SERIAL_SETUP
        BSF     RCSTA,SPEN      ; ENABLE RC6,RC7 SERIAL COMMUNICTION
        BSF     RCSTA,RX9       ; SET FOR 9 BIT RX DATA
        BSF     RCSTA,CREN      ; ENABLE RX
        BCF     STATUS,BIT6     ; BANK 1
        BSF     STATUS,BIT5     ; SETUP FOR MEMORY BANK
        BSF     TXSTA,TXEN      ; ENABLE TX
        BSF     TXSTA,TX9       ; SET TX LENGTH TO 9 BITS
        BCF     TXSTA,TX9D      ; 9 BIT SET LOW
        BCF     TXSTA,BRGH      ; SET BAUD RATE low
        MOVLW   H'0C'           ; 12 BAUD RATE FOR 4800
        MOVWF   SPBRG           ; MOVE TO BAUD RATE GENERATOR
        BCF     TXSTA,SYNC      ; SET SYNC TO  ASYNCHRONOUS MODE
        BCF     STATUS,BIT6     ; BANK 0
        BCF     STATUS,BIT5     ; SETUP FOR MEMORY BANK
RETURN

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Mike Barrett                E-mail: barrett@cambridge.scr.slb.com
Schlumberger Cambridge Research      Phone: 01223 325200
High Cross,  Cambridge, CB3 OEL. U.K    Fax: 01223 327019
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