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TITLE " MOUSE "
LIST P=16C54,R=O
;
;*******************************************
;* *
;* MOUSE CONTROLLER *
;* *
;* VERSION : 25 APRIL, 1990 *
;* *
;* PIC MODE = PIC16C54XT CLK=4.0MHZ *
;*******************************************
;
;-------------------------------------------
; FILES ASSIGNMENT
;-------------------------------------------
;
STATUS EQU 3 ;STATUS REGISTER
RA EQU 5 ;I/O PORT A
RB EQU 6 ;I/O PORT B
TIMER1 EQU 10 ;COUNTER FOR DELAY
CSTAT EQU 14 ;CO-ORDINATE STATUS
BSTAT EQU 15 ;BUTTON STATUS
DATA0 EQU 16 ;
DATA1 EQU 17 ;
DATA2 EQU 20 ;5 BYTE RS232 DATA
DATA3 EQU 21 ;
DATA4 EQU 22 ;
FLAGA EQU 23 ;GENERAL PURPOSE FLAG
XCOUNT EQU 24 ;X-MOVEMENT COUNTER
YCOUNT EQU 25 ;Y-MOVEMENT COUNTER
FLAGB EQU 26 ;GENERAL PURPOSE FLAG
COUNT EQU 30 ;GENERAL PURPOSE COUNTER
DATA_AREA EQU 31 ;FOR TEMP. STORAGE
;
;------------------------------------------
; BIT ASSIGNMENT
;------------------------------------------
;
YC EQU 0 ;Y-CLOCK PIN
YD EQU 1 ;Y-DATA PIN
UP EQU 1 ;MOVING UP FLAG
XC EQU 2 ;X-CLOCK PIN
XD EQU 3 ;X-DATA PIN
RI EQU 3 ;MOVING RIGHT FLAG
BU1 EQU 0 ;BUTTON #1 PIN
BU2 EQU 2 ;BUTTON #2 PIN
CA EQU 0 ;CARRY FLAG
RD EQU 7 ;RECEIVED DATA PIN TO RS232
ZERO_AREA EQU 2 ;ZERO FLAG
TR EQU 2 ;TIGGER FLAG
;
;===========================================
; SUBROUTINES
;===========================================
;
;*******************************************
ORG 0
;*******************************************
;
;===========================================
; DELAY A BIT TIME AND CHECK XC & YC STATUS
;===========================================
BIT
BTFSS RA,XC ;XC = 1 ?
GOTO BIT0
BTFSC CSTAT,XC ;(XC=1)
GOTO BITY ;(XC ALWAYS = 1)
INCF XCOUNT ;(XC --|__)
BCF FLAGB,RI ;DEFAULT LEFT
BTFSS RA,XD ;LEFT / RIGHT ?
GOTO BITY
BSF FLAGB,RI
GOTO BITY
BIT0
BTFSS CSTAT,XC ;(XC=0)
GOTO BITY ;(XC ALWAYS = 0)
INCF XCOUNT ;(XC __|--)
BCF FLAGB,RI ;DEFAULT LEFT
BTFSC RA,XD ;LEFT / RIGHT ?
GOTO BITY
BSF FLAGB,RI
BITY
BTFSS RA,YC ;YC = 1 ?
GOTO BITY0
BTFSC CSTAT,YC ;(YC=1)
GOTO BITDY ;(YC ALWAYS = 1)
INCF YCOUNT ;(YC --|__)
BCF FLAGB,UP ;DEFAULT DOWN
BTFSS RA,YD ;DOWN / UP ?
GOTO BITDY
BSF FLAGB,UP
GOTO BITDY
BITY0
BTFSS CSTAT,YC ;(YC=0)
GOTO BITDY ;(YC ALWAYS = 0)
INCF YCOUNT ;(YC __|--)
BCF FLAGB,UP ;DEFAULT DOWN
BTFSC RA,YD ;DOWN / UP ?
GOTO BITDY
BSF FLAGB,UP
BITDY
MOVF RA,W ;SAVE COOR. STATUS
MOVWF CSTAT
MOVLW 193D ;0.833 MS DELAY
MOVWF TIMER1
BITD0
NOP
DECFSZ TIMER1
GOTO BITD0
RETLW 0
;
;=================================================
;
;************************************************
;* SUBROUTINE TO SEND A BYTE *
;* AS RS232C FORMAT 8,N,1 *
;************************************************
;
BYTE
CLRF COUNT ;RESET 8 BIT COUNT
BTFSS FLAGA,TR ;ANY TRIGGER
GOTO BYTE0
BCF RB,RD ;LOW RD FOR START BIT
BYTE0
CALL BIT
BYTE1
BTFSS FLAGA,TR ;ANY TRIGGER ?
GOTO BYTE3
RRF DATA_AREA ;SHIFT DATA TO CARRY
BTFSS STATUS,CA ;0 / 1 ?
GOTO BYTE2
BSF RB,RD ;SEND A 1
GOTO BYTE3
BYTE2
BCF RB,RD ;SEND A 0
BYTE3
CALL BIT
INCF COUNT
BTFSS COUNT,3 ;COUNT = 8 ?
GOTO BYTE1
BTFSS FLAGA,TR ;ANY TRIGGER ?
GOTO BYTE4
BCF RB,RD ;SEND SENT BIT
CALL BIT
BSF RB,RD
CALL BIT
GOTO BYTE5
BYTE4
CALL BIT
CALL BIT
BYTE5
RETLW 0
;
;============================================
; RESET ENTRY
;============================================
;
INIT
MOVLW B'11000001' ;DISABLE WATCH DOG
OPTION
MOVLW B'00001111' ;INIT RB0~3 BE INPUTS
TRIS RB ;RB4~7 BE OUTPUTS
MOVLW B'11111111' ;INIT RA0~3 BE INPUTS
TRIS RA
BSF RB,RD ;HIGH RD PIN
COMF RB,W ;GET INIT BUTTON INPUTS
ANDLW B'00000101'
IORLW B'10000000'
MOVWF BSTAT
MOVWF DATA0
MOVF RA,W
MOVWF CSTAT
CLRF FLAGA ;CLEAR TR FLAG
CLRF XCOUNT ;RESET XCOUNT & YCOUNT
CLRF YCOUNT
SCAN
CLRF DATA1 ;UPDATE X,Y MOVEMENT DATA
CLRF DATA2
CLRF DATA3
CLRF DATA4
MOVF XCOUNT,W ;XCOUNT = 0 ?
BTFSS STATUS,ZERO_AREA
GOTO WRITX
SCANA
MOVF YCOUNT,W ;YCOUNT = 0 ?
BTFSS STATUS,ZERO_AREA
GOTO WRITY
SCANB
COMF RB,W ;BUTTON STATUS CHANGE ?
ANDLW B'00000101'
IORLW B'10000000'
SUBWF BSTAT
BTFSC STATUS,ZERO_AREA ;IF CHANGE THEN TRIGGER
GOTO SCANC ;(NO CHANGE)
BSF FLAGA,TR ;(CHANGE) SET TRIGGER FLAG
COMF RB,W ;FORMAT BUTTON STATUS DATA
ANDLW B'00000101'
IORLW B'10000000'
MOVWF DATA0
SCANC
COMF RB,W
ANDLW B'00000101'
IORLW B'10000000'
MOVWF BSTAT
MOVF DATA0,W ;SEND DATA0,1,2,3,4 TO HOST
MOVWF DATA_AREA
CALL BYTE
MOVF DATA1,W
MOVWF DATA_AREA
CALL BYTE
MOVF DATA2,W
MOVWF DATA_AREA
CALL BYTE
MOVF DATA3,W
MOVWF DATA_AREA
CALL BYTE
MOVF DATA4,W
MOVWF DATA_AREA
CALL BYTE
BCF FLAGA,TR ;CLEAR TRIGGER FLAG
GOTO SCAN
;
WRITX
BSF FLAGA,TR ;SET TRIGGER FLAG
MOVLW 40H ;IF XCOUNT > 64 THEN XCOUNT <-64
SUBWF XCOUNT,W
BTFSC STATUS,CA
GOTO WRITR
WRITS
BTFSS FLAGB,RI ;LEFT / RIGHT ?
GOTO WRITL
COMF XCOUNT ;(RIGHT) NEG XCOUNT
INCF XCOUNT,W
WRITA
MOVWF DATA1
MOVWF DATA3
CLRF XCOUNT ;RESET XCOUNT
GOTO SCANA
;
WRITR
MOVLW 40H ;XCOUNT <- 64
MOVWF XCOUNT
GOTO WRITS
;
WRITL
MOVF XCOUNT,W ;(LEFT)
GOTO WRITA
;
WRITY
BSF FLAGA,TR ;SET TRIGGER FLAG
MOVLW 40H ;IF YCOUNT > 64 THEN YCOUNT <-64
SUBWF YCOUNT,W
BTFSC STATUS,CA
GOTO WRITV
WRITW
BTFSS FLAGB,UP ;DOWN / UP ?
GOTO WRITD
COMF YCOUNT ;(UP) NEG YCOUNT
INCF YCOUNT,W
WRITB
MOVWF DATA2
MOVWF DATA4
CLRF YCOUNT ;RESET YCOUNT
GOTO SCANB
;
WRITV
MOVLW 40H ;YCOUNT <- 64
MOVWF YCOUNT
GOTO WRITW
;
WRITD
MOVF YCOUNT,W ;(DOWN)
GOTO WRITB
;
;===========================================
; RESET ENTRY
;===========================================
;
ORG 777
GOTO INIT ;JUMP TO PROGRAM STARTING
;
END
;
;********************************************
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