D/N Music v3

Old routine didn't check if you had DNS or not, it just assumed. So if you didn't have DNS, the hour would be "0" and it'd always be night music. This new routine corrects that and an error with reading R1.

.text
.align 2
.thumb
.thumb_func
.global gameboyplayerbackgroundroutine
main:
 add r3, r2, #0x4
 ldr r2, ramtable
 push {r0,r2-r7}
 ldr r0, DNS
 ldr r0, [r0]
 cmp r0, #0x0
 beq noDNS
 mov r1, #0x0
 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
noDNS: pop {r0,r2-r7}
 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
DNS:  .word 0x300553C