Border and background color circling on the C64

Here is a short mashine code program to change the colors of the border and the background with quite a decent delay
I used this with CBM prg STUDIO.


;program start
*=$0828
        lda #0
        sta colorStorage
@loop
        lda colorStorage
        sta $d020
        jsr waitSomeTime
        sta $d021
        jsr waitSomeTime
        inc colorStorage
        cmp #16
        bne @loop
        rts

colorStorage
        byte 0,4 ;this is where the color value is stored

waitSomeTime
        ldy #$7f ;127
        ldx #$ff ;255

@loopCountdown
        dex
        cpx #0
        beq @doYs
        jmp @loopCountdown

@doYs
        dey
        cpy #0
        beq back
        ldx #$ff ;255
        jmp @loopCountdown
back
        rts