Difference between revisions of "Atmel Mikrocontroller Kickstart/EinfacheBeispiele"
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= Einfache Beispiele = | = 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. | led-an.asm: Schaltet die erste LED an PortB, also an PB0 an. | ||
| Line 21: | Line 24: | ||
loop: | 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 | rjmp loop ; start main loop | ||
Revision as of 18:27, 11 October 2005
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, 0b00000001
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
