Davor Tolja wrote:
>
> I'm a newbie using a PIC16F877 trying to develop serial
> communications between the PIC and in this case, my PC.
> I followed the instructions in section 10 in the manual and I
> am pretty sure I have initialized the port properly as I do
> receive some of the data sent.  The problem is that I only
> get a couple of the characters sent and lose most of the
> message.  This is what I have done below:  any suggestions?


Most likely, the data is being sent to the TXREG before it has a chance
to send it out. It takes a certain amount of time to shift the data out,
depending on the baud rate.

This is a non interrupt method of waiting for all TX to finish.

;-------------------
; Display Message
;-------------------
displaymsg

        clrf        FSR
loop
        movf      FSR,w
        incf        FSR,f
        call         showmsg
        iorlw       0                    ; check if end of message
        btfsc        STATUS,Z
        return
        movwf     TXREG       ; send data to register
        call TransWt    ; <<<<<<<<<<<<<<<<<<<<<<
        goto  loop

;
; ------------------------------------
; WAIT UNTIL RS232 IS FINISHED SENDING
; ------------------------------------
;
TransWt bsf STATUS,RP0
WtHere  btfss TXSTA,TRMT                ; (1) transmission is complete if hi
        goto WtHere
;
        clrf STATUS             ; RAM Page 0
        return


--
Best regards

Tony

ICmicro's
http://www.picnpoke.com
mailto:sales@picnpoke.com

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