mirror of https://github.com/pret/pokecrystal.git
638 lines
12 KiB
NASM
638 lines
12 KiB
NASM
Printer_StartTransmission:
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ld hl, wGameboyPrinterRAM
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ld bc, wGameboyPrinterRAMEnd - wGameboyPrinterRAM
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xor a
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call Printer_ByteFill
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xor a
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ld [rSB], a
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ld [rSC], a
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ld [wPrinterOpcode], a
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ld hl, wPrinterConnectionOpen
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set 0, [hl]
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ld a, [wGBPrinter]
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ld [wGBPrinterSettings], a
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xor a
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ld [wJumptableIndex], a
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ret
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PrinterJumptableIteration:
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ld a, [wJumptableIndex]
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ld e, a
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ld d, 0
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ld hl, .Jumptable
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add hl, de
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add hl, de
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ld a, [hli]
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ld h, [hl]
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ld l, a
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jp hl
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.Jumptable:
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dw Print_InitPrinterHandshake ; 00
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dw Printer_CheckConnectionStatus ; 01
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dw Printer_WaitSerial ; 02
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dw Printer_StartTransmittingTilemap ; 03
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dw Printer_TransmissionLoop ; 04
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dw Printer_WaitSerialAndLoopBack2 ; 05
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dw Printer_EndTilemapTransmission ; 06
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dw Printer_TransmissionLoop ; 07
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dw Printer_WaitSerial ; 08
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dw Printer_SignalSendHeader ; 09
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dw Printer_TransmissionLoop ; 0a
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dw Printer_WaitSerial ; 0b
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dw Printer_WaitUntilFinished ; 0c
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dw Printer_Quit ; 0d
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dw Printer_NextSection ; 0e
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dw Printer_WaitSerial ; 0f
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dw Printer_SignalLoopBack ; 10
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dw Printer_SectionOne ; 11
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dw Printer_NextSectionWaitLoopBack ; 12
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dw Printer_WaitLoopBack ; 13
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_Printer_NextSection:
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ld hl, wJumptableIndex
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inc [hl]
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ret
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Printer_PrevSection:
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ld hl, wJumptableIndex
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dec [hl]
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ret
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Printer_Quit:
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xor a
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ld [wPrinterStatusFlags], a
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ld hl, wJumptableIndex
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set 7, [hl]
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ret
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Printer_NextSection:
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call _Printer_NextSection
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ret
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Printer_SectionOne:
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ld a, $1
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ld [wJumptableIndex], a
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ret
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Print_InitPrinterHandshake:
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call Printer_ResetData
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ld hl, PrinterDataPacket1
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call Printer_CopyPacket
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xor a
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ld [wPrinterSendByteCounter], a
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ld [wPrinterSendByteCounter + 1], a
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ld a, [wPrinterQueueLength]
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ld [wPrinterRowIndex], a
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call _Printer_NextSection
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call Printer_WaitHandshake
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ld a, PRINTER_STATUS_CHECKING
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ld [wPrinterStatus], a
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ret
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Printer_StartTransmittingTilemap:
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call Printer_ResetData
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; check ???
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ld hl, wPrinterRowIndex
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ld a, [hl]
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and a
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jr z, Printer_EndTilemapTransmission
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; send packet 3
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ld hl, PrinterDataPacket3 ; signal start of transmission
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call Printer_CopyPacket
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; prepare to send 40 tiles
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call Printer_Convert2RowsTo2bpp
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ld a, LOW(40 tiles)
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ld [wPrinterSendByteCounter], a
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ld a, HIGH(40 tiles)
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ld [wPrinterSendByteCounter + 1], a
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; compute the checksum
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call Printer_ComputeChecksum
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call _Printer_NextSection
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call Printer_WaitHandshake
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ld a, PRINTER_STATUS_TRANSMITTING
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ld [wPrinterStatus], a
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ret
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Printer_EndTilemapTransmission:
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; ensure that we go from here to routine 7
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ld a, $6
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ld [wJumptableIndex], a
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; send packet 4
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ld hl, PrinterDataPacket4 ; signal no transmission
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call Printer_CopyPacket
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; send no tile data
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xor a
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ld [wPrinterSendByteCounter], a
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ld [wPrinterSendByteCounter + 1], a
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call _Printer_NextSection
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call Printer_WaitHandshake
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ret
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Printer_SignalSendHeader:
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call Printer_ResetData
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ld hl, PrinterDataPacket2 ; signal request print
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call Printer_CopyPacket
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; prepare to send 1 tile
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call Printer_StageHeaderForSend
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ld a, LOW(4)
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ld [wPrinterSendByteCounter], a
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ld a, HIGH(4)
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ld [wPrinterSendByteCounter + 1], a
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; compute the checksum
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call Printer_ComputeChecksum
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call _Printer_NextSection
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call Printer_WaitHandshake
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ld a, PRINTER_STATUS_PRINTING
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ld [wPrinterStatus], a
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ret
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Printer_SignalLoopBack:
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call Printer_ResetData
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; send packet 1
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ld hl, PrinterDataPacket1 ; signal no transmission
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call Printer_CopyPacket
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; send no tile data
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xor a
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ld [wPrinterSendByteCounter], a
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ld [wPrinterSendByteCounter + 1], a
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ld a, [wPrinterQueueLength]
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ld [wPrinterRowIndex], a
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call _Printer_NextSection
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call Printer_WaitHandshake
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ret
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Printer_WaitSerial:
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ld hl, wPrinterSerialFrameDelay
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inc [hl]
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ld a, [hl]
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cp $6
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ret c
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xor a
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ld [hl], a
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call _Printer_NextSection
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ret
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Printer_WaitSerialAndLoopBack2:
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ld hl, wPrinterSerialFrameDelay
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inc [hl]
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ld a, [hl]
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cp $6
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ret c
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xor a
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ld [hl], a
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ld hl, wPrinterRowIndex
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dec [hl]
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call Printer_PrevSection
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call Printer_PrevSection
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ret
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Printer_CheckConnectionStatus:
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ld a, [wPrinterOpcode]
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and a
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ret nz
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ld a, [wPrinterHandshake]
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cp $ff
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jr nz, .printer_connected
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ld a, [wPrinterStatusFlags]
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cp $ff
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jr z, .printer_error
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.printer_connected
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ld a, [wPrinterHandshake]
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cp $81
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jr nz, .printer_error
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ld a, [wPrinterStatusFlags]
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cp $0
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jr nz, .printer_error
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ld hl, wPrinterConnectionOpen
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set 1, [hl]
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ld a, $5
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ld [wHandshakeFrameDelay], a
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call _Printer_NextSection
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ret
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.printer_error
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ld a, $ff
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ld [wPrinterHandshake], a
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ld [wPrinterStatusFlags], a
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ld a, $e
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ld [wJumptableIndex], a
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ret
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Printer_TransmissionLoop:
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ld a, [wPrinterOpcode]
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and a
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ret nz
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ld a, [wPrinterStatusFlags]
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and $f0
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jr nz, .enter_wait_loop
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ld a, [wPrinterStatusFlags]
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and $1
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jr nz, .cycle_back
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call _Printer_NextSection
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ret
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.cycle_back
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call Printer_PrevSection
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ret
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.enter_wait_loop
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ld a, $12 ; Printer_NextSectionWaitLoopBack
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ld [wJumptableIndex], a
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ret
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Printer_WaitUntilFinished:
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ld a, [wPrinterOpcode]
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and a
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ret nz
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ld a, [wPrinterStatusFlags]
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and $f3
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ret nz
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call _Printer_NextSection
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ret
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Printer_NextSectionWaitLoopBack:
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call _Printer_NextSection
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Printer_WaitLoopBack:
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ld a, [wPrinterOpcode]
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and a
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ret nz
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ld a, [wPrinterStatusFlags]
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and $f0
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ret nz
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xor a
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ld [wJumptableIndex], a
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ret
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Printer_WaitHandshake:
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.loop
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ld a, [wPrinterOpcode]
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and a
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jr nz, .loop
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xor a
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ld [wPrinterSendByteOffset], a
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ld [wPrinterSendByteOffset + 1], a
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ld a, $1
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ld [wPrinterOpcode], a
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ld a, $88
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ld [rSB], a
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ld a, $1
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ld [rSC], a
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ld a, $81
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ld [rSC], a
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ret
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Printer_CopyPacket:
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ld a, [hli]
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ld [wPrinterData], a
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ld a, [hli]
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ld [wPrinterData + 1], a
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ld a, [hli]
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ld [wPrinterData + 2], a
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ld a, [hli]
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ld [wPrinterData + 3], a
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ld a, [hli]
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ld [wPrinterChecksum], a
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ld a, [hl]
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ld [wPrinterChecksum + 1], a
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ret
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Printer_ResetData:
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xor a
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ld hl, wPrinterData
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ld [hli], a
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ld [hli], a
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ld [hli], a
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ld [hl], a
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ld hl, wPrinterChecksum
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ld [hli], a
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ld [hl], a
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xor a
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ld [wPrinterSendByteCounter], a
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ld [wPrinterSendByteCounter + 1], a
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ld hl, wGameboyPrinterRAM
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ld bc, wGameboyPrinter2bppSourceEnd - wGameboyPrinter2bppSource
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call Printer_ByteFill
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ret
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Printer_ComputeChecksum:
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ld hl, 0
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ld bc, 4
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ld de, wPrinterData
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call .ComputeChecksum
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ld a, [wPrinterSendByteCounter]
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ld c, a
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ld a, [wPrinterSendByteCounter + 1]
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ld b, a
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ld de, wGameboyPrinterRAM
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call .ComputeChecksum
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ld a, l
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ld [wPrinterChecksum], a
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ld a, h
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ld [wPrinterChecksum + 1], a
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ret
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.ComputeChecksum:
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.loop
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ld a, [de]
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inc de
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add l
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jr nc, .no_overflow
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inc h
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.no_overflow
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ld l, a
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dec bc
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ld a, c
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or b
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jr nz, .loop
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ret
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Printer_StageHeaderForSend:
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ld a, $1
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ld [wGameboyPrinter2bppSource + 0], a
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ld a, [wcbfa]
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ld [wGameboyPrinter2bppSource + 1], a
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ld a, %11100100
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ld [wGameboyPrinter2bppSource + 2], a
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ld a, [wGBPrinterSettings]
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ld [wGameboyPrinter2bppSource + 3], a
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ret
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Printer_Convert2RowsTo2bpp:
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; de = wPrinterTileMapBuffer + 2 * SCREEN_WIDTH * ([wPrinterQueueLength] - [wPrinterRowIndex])
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ld a, [wPrinterRowIndex]
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xor $ff
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ld d, a
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ld a, [wPrinterQueueLength]
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inc a
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add d
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ld hl, wPrinterTileMapBuffer
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ld de, 2 * SCREEN_WIDTH
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.loop1
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and a
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jr z, .okay1
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add hl, de
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dec a
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jr .loop1
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.okay1
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ld e, l
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ld d, h
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ld hl, wGameboyPrinter2bppSource
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ld c, 2 * SCREEN_WIDTH
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.loop2
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ld a, [de]
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inc de
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push bc
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push de
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push hl
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; convert tile index to vram address
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swap a
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ld d, a
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and $f0
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ld e, a
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ld a, d
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and $f
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ld d, a
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and $8
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ld a, d
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jr nz, .vtiles_8xxx
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or $90
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jr .got_vtile_addr
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.vtiles_8xxx
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or $80
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.got_vtile_addr
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ld d, a
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; copy 1 vtile to hl
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lb bc, BANK(Printer_Convert2RowsTo2bpp), 1
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call Request2bpp
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pop hl
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ld de, 1 tiles
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add hl, de
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pop de
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pop bc
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dec c
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jr nz, .loop2
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ret
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Printer_ByteFill:
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push de
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ld e, a
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.loop
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ld [hl], e
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inc hl
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dec bc
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ld a, c
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or b
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jr nz, .loop
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ld a, e
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pop de
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ret
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PrinterDataPacket1:
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db 1, 0, $00, 0
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dw 1
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PrinterDataPacket2:
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db 2, 0, $04, 0
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dw 0
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PrinterDataPacket3:
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db 4, 0, $80, 2
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dw 0
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PrinterDataPacket4:
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db 4, 0, $00, 0
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dw 4
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PrinterDataPacket5: ; unused
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db 8, 0, $00, 0
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dw 8
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PrinterDataPacket6: ; unused
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db 15, 0, $00, 0
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dw 15
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_PrinterReceive::
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ld a, [wPrinterOpcode]
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add a
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ld e, a
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ld d, 0
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ld hl, .Jumptable
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add hl, de
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ld a, [hli]
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ld h, [hl]
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ld l, a
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jp hl
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.Jumptable:
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dw Printer_DoNothing ; 00
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dw Printer_Send0x33 ; 01
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dw Printer_SendPrinterData1 ; 02
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dw Printer_SendPrinterData2 ; 03
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dw Printer_SendPrinterData3 ; 04
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dw Printer_SendPrinterData4 ; 05
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dw Printer_SendNextByte ; 06
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dw Printer_SendwPrinterChecksumLo ; 07
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dw Printer_SendwPrinterChecksumHi ; 08
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dw Printer_Send0x00_2 ; 09
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dw Printer_ReceiveTwoPrinterHandshakeAndSend0x00 ; 0a
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dw Printer_ReceiveTwoPrinterStatusFlagsAndExitSendLoop ; 0b
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dw Printer_Send0x33 ; 0c triggered by AskSerial
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dw Printer_Send0x0f ; 0d
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dw Printer_Send0x00 ; 0e
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dw Printer_Send0x00 ; 0f
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dw Printer_Send0x00 ; 10
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dw Printer_Send0x0f ; 11
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dw Printer_Send0x00 ; 12
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dw Printer_Send0x00_2 ; 13
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dw Printer_ReceiveTwoPrinterHandshakeAndSend0x00 ; 14
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dw Printer_ReceiveTwoPrinterStatusFlagsAndExitSendLoop_2 ; 15
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dw Printer_Send0x33 ; 16 triggered by pressing B
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dw Printer_Send0x08 ; 17
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dw Printer_Send0x00 ; 18
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dw Printer_Send0x00 ; 19
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dw Printer_Send0x00 ; 1a
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dw Printer_Send0x08 ; 1b
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dw Printer_Send0x00 ; 1c
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dw Printer_Send0x00_2 ; 1d
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dw Printer_ReceiveTwoPrinterHandshakeAndSend0x00 ; 1e
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dw Printer_ReceiveTwoPrinterStatusFlagsAndExitSendLoop ; 1f
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Printer_NextInstruction:
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ld hl, wPrinterOpcode
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inc [hl]
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ret
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Printer_DoNothing:
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ret
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Printer_Send0x33:
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ld a, $33
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call Printer_SerialSend
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call Printer_NextInstruction
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ret
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Printer_SendPrinterData1:
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ld a, [wPrinterData]
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call Printer_SerialSend
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call Printer_NextInstruction
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ret
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Printer_SendPrinterData2:
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ld a, [wPrinterData + 1]
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call Printer_SerialSend
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call Printer_NextInstruction
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ret
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Printer_SendPrinterData3:
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ld a, [wPrinterData + 2]
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call Printer_SerialSend
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call Printer_NextInstruction
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ret
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Printer_SendPrinterData4:
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ld a, [wPrinterData + 3]
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call Printer_SerialSend
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call Printer_NextInstruction
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ret
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Printer_SendNextByte:
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; decrement 16-bit counter
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ld hl, wPrinterSendByteCounter
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ld a, [hli]
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ld d, [hl]
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ld e, a
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or d
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jr z, .done
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dec de
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ld [hl], d
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dec hl
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ld [hl], e
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ld a, [wPrinterSendByteOffset]
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ld e, a
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ld a, [wPrinterSendByteOffset + 1]
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ld d, a
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ld hl, wGameboyPrinterRAM
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add hl, de
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inc de
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ld a, e
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ld [wPrinterSendByteOffset], a
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ld a, d
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ld [wPrinterSendByteOffset + 1], a
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ld a, [hl]
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call Printer_SerialSend
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ret
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.done
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call Printer_NextInstruction
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Printer_SendwPrinterChecksumLo:
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ld a, [wPrinterChecksum]
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call Printer_SerialSend
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call Printer_NextInstruction
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ret
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Printer_SendwPrinterChecksumHi:
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ld a, [wPrinterChecksum + 1]
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call Printer_SerialSend
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call Printer_NextInstruction
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ret
|
|
|
|
Printer_Send0x00_2:
|
|
; identical to Printer_Send0x00, but referenced less
|
|
ld a, $0
|
|
call Printer_SerialSend
|
|
call Printer_NextInstruction
|
|
ret
|
|
|
|
Printer_ReceiveTwoPrinterHandshakeAndSend0x00:
|
|
ld a, [rSB]
|
|
ld [wPrinterHandshake], a
|
|
ld a, $0
|
|
call Printer_SerialSend
|
|
call Printer_NextInstruction
|
|
ret
|
|
|
|
Printer_ReceiveTwoPrinterStatusFlagsAndExitSendLoop:
|
|
ld a, [rSB]
|
|
ld [wPrinterStatusFlags], a
|
|
xor a
|
|
ld [wPrinterOpcode], a
|
|
ret
|
|
|
|
Printer_Send0x0f:
|
|
ld a, $f
|
|
call Printer_SerialSend
|
|
call Printer_NextInstruction
|
|
ret
|
|
|
|
Printer_Send0x00:
|
|
ld a, $0
|
|
call Printer_SerialSend
|
|
call Printer_NextInstruction
|
|
ret
|
|
|
|
Printer_Send0x08:
|
|
ld a, $8
|
|
call Printer_SerialSend
|
|
call Printer_NextInstruction
|
|
ret
|
|
|
|
Printer_SerialSend:
|
|
ld [rSB], a
|
|
ld a, $1 ; switch to internal clock
|
|
ld [rSC], a
|
|
ld a, $81 ; start transfer
|
|
ld [rSC], a
|
|
ret
|
|
|
|
Printer_ReceiveTwoPrinterStatusFlagsAndExitSendLoop_2:
|
|
; identical to Printer_ReceiveTwoPrinterStatusFlagsAndExitSendLoop, but referenced less
|
|
ld a, [rSB]
|
|
ld [wPrinterStatusFlags], a
|
|
xor a
|
|
ld [wPrinterOpcode], a
|
|
ret
|