Apple-2-HW/Apple2-IO-RPi
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Apple2-IO-RPi/Apple2/RPi.Command.lst
Terence Boldt 78d0b86b2f Add version info
2022-02-07 22:01:06 -05:00

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ca65 V2.18 - N/A
Main file : RPi.Command.asm
Current file: RPi.Command.asm
000000r 1 ; Copyright Terence J. Boldt (c)2021-2022
000000r 1 ; Use of this source code is governed by an MIT
000000r 1 ; license that can be found in the LICENSE file.
000000r 1
000000r 1 ; This file contains the source for the RPI.COMMAND
000000r 1 ; application that runs on the Apple II and extends
000000r 1 ; ProDOS BASIC.SYSTEM to add the RPI command which
000000r 1 ; allows commands to be executed on the Raspberry Pi
000000r 1
000000r 1 .ORG $300
000300 1 INBUF = $200 ;GETLN input buffer.
000300 1 WAIT = $FCA8 ;Monitor wait routine.
000300 1 BELL = $FF3A ;Monitor bell routine.
000300 1 EXTRNCMD = $BE06 ;External cmd JMP vector.
000300 1 XTRNADDR = $BE50 ;Ext cmd implementation addr.
000300 1 XLEN = $BE52 ;length of command string-1.
000300 1 XCNUM = $BE53 ;CI cmd no. (ext cmd - 0).
000300 1 PBITS = $BE54 ;Command parameter bits.
000300 1 XRETURN = $FF58 ;Known RTS instruction.
000300 1 InputByte = $c08e
000300 1 OutputByte = $c08d
000300 1 InputFlags = $c08b
000300 1 OutputFlags = $c087
000300 1
000300 1 ReadBlockCommand = $01
000300 1 WriteBlockCommand = $02
000300 1 GetTimeCommand = $03
000300 1 ChangeDriveCommand = $04
000300 1 ExecCommand = $05
000300 1 LoadFileCommand = $06
000300 1 SaveFileCommand = $07
000300 1 MenuCommand = $08
000300 1
000300 1 InputString = $fd67
000300 1 PrintChar = $fded
000300 1 Keyboard = $c000
000300 1 ClearKeyboard = $c010
000300 1 Wait = $fca8
000300 1
000300 1 LastChar = $06
000300 1 SlotL = $fe
000300 1 SlotH = $ff
000300 1 ESC = $9b
000300 1
000300 1 .org $2000
002000 1 A2 07 ldx #$07 ; start at slot 7
002002 1 DetectSlot:
002002 1 A0 00 ldy #$00
002004 1 A9 FC lda #$fc
002006 1 85 FE sta SlotL
002008 1 8A txa
002009 1 09 C0 ora #$c0
00200B 1 85 FF sta SlotH
00200D 1 B1 FE lda (SlotL),y
00200F 1 D0 1C bne nextSlot
002011 1 C8 iny
002012 1 B1 FE lda (SlotL),y
002014 1 D0 17 bne nextSlot
002016 1 C8 iny
002017 1 B1 FE lda (SlotL),y
002019 1 C9 17 cmp #$17
00201B 1 D0 10 bne nextSlot
00201D 1 C8 iny
00201E 1 B1 FE lda (SlotL),y
002020 1 C9 14 cmp #$14
002022 1 D0 09 bne nextSlot
002024 1 8A txa
002025 1 0A asl
002026 1 0A asl
002027 1 0A asl
002028 1 0A asl
002029 1 AA tax
00202A 1 18 clc
00202B 1 90 04 bcc Start
00202D 1 nextSlot:
00202D 1 CA dex
00202E 1 D0 D2 bne DetectSlot
002030 1 60 rts
002031 1 Start:
002031 1 8E 48 21 stx slotx + $1e01 ;set the slot for the driver
002034 1 A2 00 ldx #$00
002036 1 copyDriver:
002036 1 BD 00 21 lda $2100,x
002039 1 9D 00 03 sta $0300,x
00203C 1 E8 inx
00203D 1 E0 E6 cpx #$e6
00203F 1 D0 F5 bne copyDriver
002041 1 end:
002041 1 4C 00 03 jmp $0300
002044 1
002044 1 00 00 00 00 .repeat 253-<end
002048 1 00 00 00 00
00204C 1 00 00 00 00
002100 1 .byte 0
002100 1 .endrepeat
002100 1
002100 1 .org $0300
000300 1 ;
000300 1 ; FIRST SAVE THE EXTERNAL COMMAND ADDRESS SO YOU WON'T
000300 1 ; DISCONNECT ANY PREVIOUSLY CONNECTED COMMAND.
000300 1 ;
000300 1 AD 07 BE LDA EXTRNCMD+1
000303 1 8D E5 03 STA NXTCMD
000306 1 AD 08 BE LDA EXTRNCMD+2
000309 1 8D E6 03 STA NXTCMD+1
00030C 1 ;
00030C 1 A9 17 LDA #<RPI ;Install the address of our
00030E 1 8D 07 BE STA EXTRNCMD+1 ; command handler in the
000311 1 A9 03 LDA #>RPI ; external command JMP
000313 1 8D 08 BE STA EXTRNCMD+2 ; vector.
000316 1 60 RTS
000317 1 ;
000317 1 A2 00 RPI: LDX #0 ;Check for our command.
000319 1 BD 00 02 NXTCHR: LDA INBUF,X ;Get first character.
00031C 1 09 20 ora #$20 ;Make it lower case
00031E 1 DD E2 03 CMP CMD,X ;Does it match?
000321 1 D0 29 BNE NOTOURS ;No, back to CI.
000323 1 E8 INX ;Next character
000324 1 E0 03 CPX #CMDLEN ;All characters yet?
000326 1 D0 F1 BNE NXTCHR ;No, read next one.
000328 1 ;
000328 1 A9 02 LDA #CMDLEN-1 ;Our cmd! Put cmd length-1
00032A 1 ;lda #$8d
00032A 1 ;sta $02ff
00032A 1 ;lda #$fe
00032A 1 8D 52 BE STA XLEN ; in CI global XLEN.
00032D 1 A9 58 LDA #<XRETURN ;Point XTRNADDR to a known
00032F 1 8D 50 BE STA XTRNADDR ; RTS since we'll handle
000332 1 A9 FF LDA #>XRETURN ; at the time we intercept
000334 1
000334 1 8D 51 BE STA XTRNADDR+1 ; our command.
000337 1 A9 00 LDA #0 ;Mark the cmd number as
000339 1 8D 53 BE STA XCNUM ; zero (external).
00033C 1 8D 54 BE STA PBITS ;And indicate no parameters
00033F 1 8D 55 BE STA PBITS+1 ; to be parsed.
000342 1 A9 8D lda #$8d
000344 1 20 ED FD jsr $fded
000347 1 A2 70 slotx: ldx #$70 ; set x to slot # in high nibble
000349 1 18 clc
00034A 1 90 04 bcc SendCommand
00034C 1 ;
00034C 1 38 NOTOURS: SEC ; ALWAYS SET CARRY IF NOT YOUR
00034D 1 6C E5 03 JMP (NXTCMD) ; CMD AND LET NEXT COMMAND TRY
000350 1 ; ; TO CLAIM IT.
000350 1
000350 1 SendCommand:
000350 1 2C 10 C0 bit ClearKeyboard
000353 1 A9 05 lda #$05 ;send command 5 = exec
000355 1 20 9B 03 jsr SendByte
000358 1 A0 03 ldy #$03 ;skip over "RPI"
00035A 1 getInput:
00035A 1 B9 00 02 lda $0200,y
00035D 1 C9 8D cmp #$8d
00035F 1 F0 08 beq sendNullTerminator
000361 1 29 7F and #$7f
000363 1 20 9B 03 jsr SendByte
000366 1 C8 iny
000367 1 D0 F1 bne getInput
000369 1 sendNullTerminator:
000369 1 A9 00 lda #$00
00036B 1 20 9B 03 jsr SendByte
00036E 1 DumpOutput:
00036E 1 20 B9 03 jsr GetByte
000371 1 B0 07 bcs skipOutput
000373 1 C9 00 cmp #$00
000375 1 F0 19 beq endOutput
000377 1 20 ED FD jsr PrintChar
00037A 1 skipOutput:
00037A 1 2C 00 C0 bit Keyboard ;check for keypress
00037D 1 10 EF bpl DumpOutput ;keep dumping output if no keypress
00037F 1 AD 00 C0 lda Keyboard ;send keypress to RPi
000382 1 20 ED FD jsr PrintChar
000385 1 29 7F and #$7f
000387 1 20 9B 03 jsr SendByte
00038A 1 2C 10 C0 bit ClearKeyboard
00038D 1 18 clc
00038E 1 90 DE bcc DumpOutput
000390 1 endOutput:
000390 1 18 clc
000391 1 6C E5 03 jmp (NXTCMD)
000394 1
000394 1 HelpCommand:
000394 1 61 32 68 65 .byte "a2help",$00
000398 1 6C 70 00
00039B 1
00039B 1 SendByte:
00039B 1 48 pha
00039C 1 waitWrite:
00039C 1 BD 8B C0 lda InputFlags,x
00039F 1 2A rol
0003A0 1 2A rol
0003A1 1 B0 F9 bcs waitWrite
0003A3 1 68 pla
0003A4 1 9D 8D C0 sta OutputByte,x
0003A7 1 A9 1E lda #$1e ; set bit 0 low to indicate write started
0003A9 1 9D 87 C0 sta OutputFlags,x
0003AC 1 finishWrite:
0003AC 1 BD 8B C0 lda InputFlags,x
0003AF 1 2A rol
0003B0 1 2A rol
0003B1 1 90 F9 bcc finishWrite
0003B3 1 A9 1F lda #$1f
0003B5 1 9D 87 C0 sta OutputFlags,x
0003B8 1 60 rts
0003B9 1
0003B9 1 GetByte:
0003B9 1 A9 1D lda #$1d ;set read flag low
0003BB 1 9D 87 C0 sta OutputFlags,x
0003BE 1 waitRead:
0003BE 1 BD 8B C0 lda InputFlags,x
0003C1 1 2A rol
0003C2 1 90 0C bcc readByte
0003C4 1 2C 00 C0 bit Keyboard ;keypress will abort waiting to read
0003C7 1 10 F5 bpl waitRead
0003C9 1 A9 1F lda #$1f ;set all flags high and exit
0003CB 1 9D 87 C0 sta OutputFlags,x
0003CE 1 38 sec ;failure
0003CF 1 60 rts
0003D0 1 readByte:
0003D0 1 BD 8E C0 lda InputByte,x
0003D3 1 48 pha
0003D4 1 A9 1F lda #$1f ;set all flags high
0003D6 1 9D 87 C0 sta OutputFlags,x
0003D9 1 finishRead:
0003D9 1 BD 8B C0 lda InputFlags,x
0003DC 1 2A rol
0003DD 1 90 FA bcc finishRead
0003DF 1 68 pla
0003E0 1 18 clc ;success
0003E1 1 60 rts
0003E2 1
0003E2 1
0003E2 1 ;macro for string with high-bit set
0003E2 1 .macro aschi str
0003E2 1 .repeat .strlen (str), c
0003E2 1 .byte .strat (str, c) | $80
0003E2 1 .endrep
0003E2 1 .endmacro
0003E2 1
0003E2 1 F2 F0 E9 CMD: aschi "rpi"
0003E5 1 CMDLEN = 3 ;Our command length
0003E5 1 ;
0003E5 1 00 00 NXTCMD: .byte 0,0 ; STORE THE NEXT EXT CMD'S
0003E7 1 ; ADDRESS HERE.
0003E7 1
0003E7 1
0003E7 1
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