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simpleled_2.s
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1995-02-27
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* $VER: SimpleLED_2_Source 1.0 (21-Oct-93)
* *****************************************
* * SimpleLED_2.s v1.0 *
* * Copyright © 1993, Richard Karlsson *
* * *
* * Klövergränd 4 *
* * SF-22100 Mariehamn *
* * Finland *
* * *
* * Ph. +358-28-22441 *
* *****************************************
* This program will make a nice moving pattern of two lit LEDs
* traveling the oposite directions on PORTB. See theSimpleLED_1.s
* source for more info on how to set up the LEDs.
* Read the comments for SimpleLED_1.s before trying this example.
RAM = 0
EEPROM = $b600
RegBase = $1000
Include "HcInclude:A8Regs.i"
org RAM
Left rmb 1 ; Leave one byte room for "Left" and
Right rmb 1 ; "Right". Here the two LEDs positions
; are stored.
org EEPROM
ldaa #1 ; Set start position for the LED
staa Left ; travelling left.
ldaa #1<<7 ; And the start position for the other
staa Right ; one.
Main
ldaa Left ; Logic OR the Left and Right LEDs
oraa Right ; together to make a single pattern
staa PORTB ; at PORTB
ldaa Left ; Move the LED travelling left one
rola ; position to the left. If it comes
ldaa Left ; to the end of the port it will start
rola ; over from the beginning.
staa Left
ldaa Right ; And move the other LED.
rora
ldaa Right
rora
staa Right
bsr HumaneDelay ; Wait a while so that you can see the
; pattern.
bra Main ; And start over.
HumaneDelay
* Wait while the processor is couting to 300000.
* Trashes Index register X and Y.
ldx #5
HD_Outer
ldy #60000
HD_Inner
dey
bne HD_Inner
dex
bne HD_Outer
rts