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Copy pathPad.asm
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Pad.asm
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; No args
; Information about buttons is stored in R10
PAD_init:
sbi DDRD, PAD_LATCH
cbi DDRD, PAD_DATA
sbi DDRD, PAD_CLK
cbi PORTD, PAD_LATCH
sbi PORTD, PAD_CLK
sbi PORTD, PAD_DATA
ret
; Reads pad state
; return r10 - pad1_byte
; 0bB A S S U D L R
; e t p o e i
; l a w f g
; e r n t h
; c t t
; t
PAD_GetState:
push r16
push r17
push r18
sbi PAD_PORT, PAD_LATCH
delay200ns 60 ;12us
cbi PAD_PORT, PAD_LATCH
ldi r18, 8
clr r17
; 8bits
GetPadState_loop:
delay200ns 60 ;6us
cbi PAD_PORT, PAD_CLK
sbis PAD_PIN, PAD_DATA ; pominie, jezeli nienacisniety
rcall button_pressed
delay200ns 60 ;6us
sbi PAD_PORT, PAD_CLK
GetPadState_continue:
dec r18
breq GetPadState_end
lsl r17 ; xxxxxxx1 -> xxxxxx1y
rjmp GetPadState_loop
GetPadState_end:
mov r10, r17
pop r18
pop r17
pop r16
ret
button_pressed:
ori r17, 1
ret