D/N switch

.text
.align 2
.thumb
.thumb_func
.global gameboyplayerbackgroundroutine
main:
 add r3, r2, #0x4
 ldr r2, ramtable
 push {r0,r2-r7}
 ldr r0, hour
 ldrb r0, [r0]
 add r1, r0, #0x0
 pop {r0,r2-r7}
 cmp r1, #0x4
 blt gbp
 cmp r1, #0x14
 bge gbp
 ldr r1, normaltable
 b exit
gbp: ldr r1, gbptable
exit: lsr r0, r0, #0xD
 add r0, r0, r1
 mov pc, r3
.align
ramtable: .word 0x084A329C
normaltable: .word 0x08B43D00
gbptable: .word 0x08B44D00
hour:  .word 0x3005542