.globl _main
_main:
exisendbyte:
	# r0 should be the byte.
	# r1, r2 get clobbered
	mov r2, #0xB0
	mov r2, r2, LSL #24
	add r2, r0, LSL #20
	# r2 is now 0xB0000000 + (sendbyte<<20)
	mov r0, #0x0d
	mov r1, r0, LSL #24
	mov r0, #0x68
	add r1, r0, LSL #8
	# r1 is 0x0d006800
	# 19; d0; cd00
	mov r0, #0xd0
	str r0, [r1, #0x14]
	str r2, [r1, #0x24]
	mov r0, #0xcd00
	str r0, [r1, #0x20]
	bx lr
exicheckreceivewait:
	ldr r0, [r1, #0x20]
	ands r0, r0, #1
	bne exicheckreceivewait

	ldr r2, [r1, #0x24]
	str r0, [r1, #0x14]
	mov r2, r2, LSL #26 ;#did it work?
	and r0, r2, #1