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- Code:
- XDEF Entry
- XREF __SEG_END_SSTACK
- ; variable/data w
- MY_EXTENDED_RAM: SECTION
- ARR dc.b $0A,$12,$14,$0C,$0
- port_p equ $258
- ddrp equ $25A
- MY_CONSTANT_ROM: SECTION ; constant/definition section
- ; code section
- MyCode: SECTION
- main:
- _Startup:
- Entry:
- ldaa #$1e ;load the proper direction modes to acc. A
- staa ddrp ;push the direction modes into port P DDR
- loop: ldx #ARR ;load the start of sequence of bytes to spin the motor into
- ;register X
- loop1:
- ldaa 1,x+ ;load into A the first value of the array
- cmpa #0 ;check that we are not at the end of the array
- beq loop ;if we are at the end of the array, reload the first array
- ;value
- staa port_p ;push the value in accumulator A to port P, spinning the ;motor one quarter turn
- ldy #30000 ;load into register Y the amount by which we will delay ;loop execution
- delay1:
- dey ;decrement our delay value by 1
- bne delay1 ;if we have not decreased our delay value to zero, continue
- ;decrementing our array value
- bra loop1 ;repeat the code which turns the motor
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