;emouse.pic - electronic mouse ;stand-alone 16F84 program to generate mouse data ;joecolquitt@clear.net.nz ; org 21.12.98 ; rev 31.12.98 ; rev 09.01.99 ;Microsoft Mouse, 3 byte data stream ;1200 bps, 7 data bits, 1 stop bit, no parity ;1200 bps = 833.3us / bit = 8333 instruction cycles ;bit 7 6 5 4 3 2 1 0 ; ;Byte 1 0 0 L R Y7 Y6 X7 X6 ;Byte 2 0 0 Y5 Y4 Y3 Y2 Y1 Y0 ;Byte 3 0 0 X5 X4 X3 X2 X1 X0 ; ;X7 = 1 = left X7 = 0 = right ;Y7 = 1 = up Y7 = 0 = down ; L = 1 = left button ; R = 1 = right ; ;Other bits are speed ; ;First 20 movement instructions are for 1 pixel, after that ;4 pixels. Counter is reset when pushbutton is released status equ 03h carry equ status.0 zero equ status.2 porta equ 05h portb equ 06h option equ 81h trisa equ 85h trisb equ 86h ram equ 0ch lin equ portb.0 ;pushbutton for left rin equ portb.1 ; right uin equ portb.2 ; up din equ portb.3 ; down bin equ portb.4 ; left button comm equ portb.5 ;data to PC start equ 00h w equ 0 ;instruction suffix = w = accumulator f equ 1 ; = f = register orgdata ram data rb ;byte to send bit equ data.7 ;bit to send bcnt rb ;bit counter tdc1 rb ;time delay counter move rb ;pixel movement counter pixel rb ;movement rate counter pflags rb ;change movement rate flags lfl equ pflags.0 rfl equ pflags.1 ufl equ pflags.2 dfl equ pflags.3 config 0f2h ;10MHz crystal xxxx xx10 ;watchdog timer disabled xxxx x0xx ;power-up timer enabled xxxx 0xxx ;code not protected xxx1 xxxx org start goto entry entry movlw 00h ;Porta unused o/p tris porta movlw 1fh ;Portb = oooi iiii tris portb clrf porta ;clear data latches clrf portb movlw 80h ;Portb pull-ups off option bsf comm ;idle ;---- main loop main btfss lin ;look for direction pushbuttons goto left btfss rin goto right btfss uin goto up btfss din goto down movlw 14h ;reset movement counter movwf pixel clrf pflags ;reset rate change flags btfss bin ;mouse button goto button goto main ;---- data output setups left btfsc lfl ;if high-rate is set then 4pixel move goto left4 decfsz pixel,f ;else decrement counter until 0 goto left1 bsf lfl ;then set flag goto left4 left1 movlw 9eh ;1001 1110 call send movlw 20h ;0010 0000 (24) call send movlw 4fh ;0100 1111 call send movlw 0f0h ;1111 0000 call send goto main right btfsc rfl goto right4 decfsz pixel,f goto right1 bsf rfl goto right4 right1 movlw 0feh ;1111 1110 call send movlw 2fh ;0010 1111 (2b) call send movlw 0cfh ;1100 1111 call send movlw 0f0h ;1111 0000 call send goto main up btfsc ufl goto up4 decfsz pixel,f goto up1 bsf ufl goto up4 up1 movlw 0e6h ;1110 0110 call send movlw 3fh ;0011 1111 call send movlw 0c8h ;1100 1000 (c9) call send movlw 10h ;0001 0000 call send goto main down btfsc dfl goto down4 decfsz pixel,f goto down1 bsf dfl goto down4 down1 movlw 0feh ;1111 1110 call send movlw 3fh ;0011 1111 call send movlw 0cbh ;1100 1011 (ca) call send movlw 0f0h ;1111 0000 call send goto main left4 movlw 9eh ;1001 1110 call send movlw 24h ;0010 0100 (20) call send movlw 4fh ;0100 1111 call send movlw 0f0h ;1111 0000 call send goto main right4 movlw 0feh ;1111 1110 call send movlw 2bh ;0010 1011 (2f) call send movlw 0cfh ;1100 1111 call send movlw 0f0h ;1111 0000 call send goto main up4 movlw 0e6h ;1110 0110 call send movlw 3fh ;0011 1111 call send movlw 0c9h ;1100 1001 (c8) call send movlw 10h ;0001 0000 call send goto main down4 movlw 0feh ;1111 1110 call send movlw 3fh ;0011 1111 call send movlw 0cah ;1100 1010 (cb) call send movlw 0f0h ;1111 0000 call send goto main button movlw 0fch ;1111 1100 call send movlw 3fh ;0011 1111 call send movlw 0cfh ;1100 1111 call send movlw 0f0h ;1111 0000 call send bhold btfss bin ;wait for button release goto bhold out movlw 0feh ;1111 1110 call send movlw 3fh ;0011 1111 call send movlw 0cfh ;1100 1111 call send movlw 0f0h ;1111 0000 call send goto main ;---- ouput data bits send movwf data movlw 08h movwf bcnt sbit btfss bit ;test goto b0 b1 bcf comm ;'1' call bitdel goto newbit b0 bsf comm ;'0' call bitdel newbit rlf data,f decfsz bcnt,f goto sbit return ;---- comms timing delay bitdel movlw 00h ;bit-length delay movwf tdc1 lp1 decfsz tdc1,f goto lp1 movlw 00h movwf tdc1 lp2 decfsz tdc1,f goto lp2 movlw 0ach movwf tdc1 lp3 decfsz tdc1,f goto lp3 return
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