mirror of
https://gitlab.com/xCrystal/pokecrystal-board.git
synced 2024-09-09 09:51:34 -07:00
42 lines
595 B
NASM
42 lines
595 B
NASM
PrinterReceive::
|
|
homecall _PrinterReceive
|
|
ret
|
|
|
|
AskSerial::
|
|
; send out a handshake while serial int is off
|
|
ld a, [wPrinterConnectionOpen]
|
|
bit 0, a
|
|
ret z
|
|
|
|
; if we're still interpreting data, don't try to receive
|
|
ld a, [wPrinterOpcode]
|
|
and a
|
|
ret nz
|
|
|
|
; once every 6 frames
|
|
ld hl, wHandshakeFrameDelay
|
|
inc [hl]
|
|
ld a, [hl]
|
|
cp 6
|
|
ret c
|
|
|
|
xor a
|
|
ld [hl], a
|
|
|
|
ld a, $0c
|
|
ld [wPrinterOpcode], a
|
|
|
|
; handshake
|
|
ld a, $88
|
|
ldh [rSB], a
|
|
|
|
; switch to internal clock
|
|
ld a, (0 << rSC_ON) | (1 << rSC_CLOCK)
|
|
ldh [rSC], a
|
|
|
|
; start transfer
|
|
ld a, (1 << rSC_ON) | (1 << rSC_CLOCK)
|
|
ldh [rSC], a
|
|
|
|
ret
|