Difference between revisions of "Atmel Mikrocontroller Kickstart/EinfacheBeispiele"
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Latest revision as of 14:34, 28 May 2007
Contents
Einfache Beispiele
Alle folgenden Beispiele lassen sich mit dem Fnordlicht ausprobieren.
LED einschalten
led-an.asm: Schaltet die erste LED an PortB, also an PB0 an.
.include "m8def.inc"
.ORG 0x0 ; reset vector
rjmp reset
.ORG 0x13
reset: ; reset subprocedure
; executed after a reset (poweron)
ldi r16, 0xff ; configure PORTB as output
out DDRB, r16
ldi r16, 0x01 ; light first LED on PORTB
com r16
out PORTB, r16
loop:
rjmp loop ; start main loop
LED blinken lassen
blinken-einfach.asm: Lässt eine LED ganz schnell blinken, so dass diese gedimmt erscheint.
.include "m8def.inc"
.ORG 0x0 ; reset vector
rjmp reset
.ORG 0x13
reset: ; reset subprocedure
; executed after a reset (poweron)
ldi r16, 0xff ; configure PORTB as output
out DDRB, r16
ldi r16, 0x01 ; light first LED on PORTB
com r16
out PORTB, r16
com r16
loop:
in r17, PORTB
eor r17, r16
out PORTB, r17
rjmp loop ; start main loop
LED richtig blinken lassen
blinken-besser: Lässt LED durch eine Warteschleife verzögert richtig blinken.
.include "m8def.inc"
.ORG 0x0 ; reset vector
rjmp reset
.ORG 0x13
reset: ; reset subprocedure
; executed after a reset (poweron)
ldi r16, 0xff ; configure PORTB as output
out DDRB, r16
ldi r16, 0x01 ; light first LED on PORTB
com r16
out PORTB, r16
com r16
loop:
in r17, PORTB
eor r17, r16
out PORTB, r17
ldi r17, 0xff
outer_wait:
ldi r18, 0xff
inner_wait:
dec r18
brne inner_wait
dec r17
brne outer_wait
rjmp loop ; start main loop
