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Date Posted: 00:04:20 02/12/02 Tue
Author: Ronald
Subject: Potter: SX Code

Hi Potter, I am not able to get picture locked on your 50mhz or 20 Mhz code. How can I modify your 50Mhz source to work on this timing?

MAKEHLINE
incf COARSEFASTCNT,f ;CY=1
incf COARSESLOWCNT,f ; add 1 to both as one will ALWAYS be reset!
nop
nop
nop
nop
nop
nop
nop
nop
movlw BLACK ; make BLACK
btfss MODE,VIDEOKAY ; IF video bad THEN
movlw VIDEO ; pass video
movwf PORTB ;CY=14 change mode

nop
nop
nop
nop ; waste some time

movlw SYNC ; make SYNC
btfss MODE,VIDEOKAY ; IF video bad THEN
movlw VIDEO ; passvideo
movwf PORTB ;CY=22 change mode

nop ;
nop ;
nop ;
nop ;
nop
nop
nop
nop
nop
nop
nop
nop
nop
nop
nop
nop
nop
nop
nop

movlw BURST ; pass burst
btfss MODE,VIDEOKAY ; IF video bad THEN
movlw VIDEO ; pass video
movwf PORTB ;CY=45 change mode

movf PORTB,w ; take sample..NEW ***
nop
nop
movwf DATAHOLDER

btfsc DATAHOLDER,NEGEDGE ; IF neg edge was heard THEN
bsf DATAHOLDER,POSEDGE ; make it look like we heard pos edge

;----------------------new vcxo (digitalman)--------
bcf PORTA,PLL ;PLL=0
movlw OSCTRLON ;OSCTRLON=11111000b
btfsc DATAHOLDER,POSEDGE
movlw OSCTRLOFF ;OSCTRLOFF=11111001b
tris PORTA
;--------------------------------------------------
btfss DATAHOLDER,POSEDGE ; IF no pos edge THEN
clrf COARSEFASTCNT ; clear fast counter
btfsc DATAHOLDER,POSEDGE ; IF pos edge THEN
clrf COARSESLOWCNT ; clear slow counter

btfsc COARSEFASTCNT,6 ; WAS 6 ; IF fastcount is 64 THEN
goto NORMAL ; .4uS + .2uS to NORMAL

btfsc COARSESLOWCNT,6 ; WAS 6 ; IF slowcount is 64 THEN
goto NORMAL ; .8us + .2uS to NORMAL

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