shithub: pokecrystal

ref: 3370a04d9edce3b9ab28c9970ce7658e66fbcac0
dir: /home/handshake.asm/

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AskSerial: ; 2063
; send out a handshake while serial int is off
	ld a, [$c2d4]
	bit 0, a
	ret z
	
	ld a, [$c2d5]
	and a
	ret nz
	
; once every 6 frames
	ld hl, $ca8a
	inc [hl]
	ld a, [hl]
	cp 6
	ret c
	
	xor a
	ld [hl], a
	
	ld a, $c
	ld [$c2d5], a
	
; handshake
	ld a, $88
	ld [rSB], a
	
; switch to internal clock
	ld a, %00000001
	ld [rSC], a
	
; start transfer
	ld a, %10000001
	ld [rSC], a
	
	ret
; 208a