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touch.asm
executable file
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touch.asm
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; file: touch.asm
; author: Lucas Fric
; Alessandro Motta
; config
.equ touchTop = 0
.equ touchBot = 2
.equ touchLeft = 1
.equ touchRight = 3
.equ touchSpeed = 4
.equ touchContrDDR = DDRA
.equ touchContrPort = PORTA
.dseg
; latest pos X
touchPosX:
.byte 1
; latest pos Y
touchPosY:
.byte 1
; current mode
; 0x00 read pos X
; 0xff read pos Y
touchDir:
.byte 1
.cseg
touchInit:
; save a0
push a0
; enable ADC
; and set conversion speed
OUTI ADCSR, (1 << ADEN) + (1 << ADIE) + touchSpeed
; init control port
OUTI touchContrDDR, 0x00
OUTI touchContrPort, 0x00
; init memory
clr a0
sts touchPosX, a0
sts touchPosY, a0
sts touchDir, a0
; init first run
rcall touchInitDirX
; start conversion
sbi ADCSR, ADSC
; restore a0
pop a0
ret
; config to read pos
; in: none
touchInitDirX:
; save a0
push a0
; set direction
ldi a0, 0
sts touchDir, a0
; config control port
clr a0
ori a0, (1 << touchLeft)
ori a0, (1 << touchRight)
out touchContrDDR, a0
; write control port
clr a0
ori a0, (1 << touchRight)
out touchContrPort, a0
; select A2C line
OUTI ADMUX, touchBot
; restore a0
pop a0
ret
; config to read pos Y
; in: none
touchInitDirY:
; save a0
push a0
; set direction
ldi a0, 1
sts touchDir, a0
; config control port
clr a0
ori a0, (1 << touchTop)
ori a0, (1 << touchBot)
out touchContrDDR, a0
; write control port
clr a0
ori a0, (1 << touchBot)
out touchContrPort, a0
; select A2C line
OUTI ADMUX, touchLeft
; restore a0
pop a0
ret
; in: a0 ADC low
; a1 ADC high
; out a0 pos X
touchToPosX:
; clear carry
clc
ROR2 a1, a0
ROR2 a1, a0
ROR2 a1, a0
ROR2 a1, a0
ret
; in: a0 ADC low
; a1 ADC high
; out a0 pos Y
touchToPosY:
; clear carry
clc
ROR2 a1, a0
ROR2 a1, a0
ROR2 a1, a0
ROR2 a1, a0
ROR2 a1, a0
ret
; in: none
touchRun:
; save SREG
in _sreg, SREG
; save regs
push a0
push a1
push a2
; read result
in a0, ADCL
in a1, ADCH
; get current dir
lds a2, touchDir
; to posX
sbrs a2, 0
rcall touchToPosX
; to posY
sbrc a2, 0
rcall touchToPosY
; save pos X
sbrs a2, 0
sts touchPosX, a0
; save pos Y
sbrc a2, 0
sts touchPosY, a0
; set new dir
com a2
sts touchDir, a2
; dir X
sbrs a2, 0
rcall touchInitDirX
; dir Y
sbrc a2, 0
rcall touchInitDirY
; start conversion
sbi ADCSR, ADSC
; restore regs
pop a2
pop a1
pop a0
; restore SREG
out SREG, _sreg
reti