Initial attempt at adding command to basic
This commit is contained in:
Terence Boldt
parent
4dee72b1c2
commit
a80939355b
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.ORG $300
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INBUF = $200 ;GETLN input buffer.
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WAIT = $FCA8 ;Monitor wait routine.
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BELL = $FF3A ;Monitor bell routine.
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EXTRNCMD = $BE06 ;External cmd JMP vector.
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XTRNADDR = $BE50 ;Ext cmd implementation addr.
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XLEN = $BE52 ;length of command string-1.
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XCNUM = $BE53 ;CI cmd no. (ext cmd - 0).
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PBITS = $BE54 ;Command parameter bits.
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XRETURN = $BE9E ;Known RTS instruction.
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InputByte = $c0fe
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OutputByte = $c0fd
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InputFlags = $c0fb
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OutputFlags = $c0f7
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ReadBlockCommand = $01
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WriteBlockCommand = $02
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GetTimeCommand = $03
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ChangeDriveCommand = $04
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ExecCommand = $05
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LoadFileCommand = $06
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SaveFileCommand = $07
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MenuCommand = $08
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InputString = $fd67
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PrintChar = $fded
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Keyboard = $c000
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ClearKeyboard = $c010
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Wait = $fca8
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;
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; FIRST SAVE THE EXTERNAL COMMAND ADDRESS SO YOU WON'T
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; DISCONNECT ANY PREVIOUSLY CONNECTED COMMAND.
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;
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LDA EXTRNCMD+1
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STA NXTCMD
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LDA EXTRNCMD+2
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STA NXTCMD+1
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;
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LDA #<RPI ;Install the address of our
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STA EXTRNCMD+1 ; command handler in the
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LDA #>RPI ; external command JMP
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STA EXTRNCMD+2 ; vector.
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RTS
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;
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RPI: LDX #0 ;Check for our command.
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NXTCHR: LDA INBUF,X ;Get first character.
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ora #$20 ;Make it lower case
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CMP CMD,X ;Does it match?
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BNE NOTOURS ;No, back to CI.
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INX ;Next character
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CPX #CMDLEN ;All characters yet?
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BNE NXTCHR ;No, read next one.
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;
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LDA #CMDLEN-1 ;Our cmd! Put cmd length-1
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STA XLEN ; in CI global XLEN.
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LDA #>XRETURN ;Point XTRNADDR to a known
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STA XTRNADDR ; RTS since we'll handle
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LDA #<XRETURN ; at the time we intercept
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STA XTRNADDR+1 ; our command.
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LDA #0 ;Mark the cmd number as
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STA XCNUM ; zero (external).
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STA PBITS ;And indicate no parameters
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STA PBITS+1 ; to be parsed.
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lda #$8d
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jsr $fded
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clc
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bcc SendCommand
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;
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NOTOURS: SEC ; ALWAYS SET CARRY IF NOT YOUR
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JMP (NXTCMD) ; CMD AND LET NEXT COMMAND TRY
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; ; TO CLAIM IT.
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SendCommand:
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bit ClearKeyboard
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lda #$05 ;send command 5 = exec
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jsr SendByte
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ldy #$03 ;skip over "RPI"
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getInput:
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lda $0200,y
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cmp #$8d
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beq sendNullTerminator
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and #$7f
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jsr SendByte
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iny
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bne getInput
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sendNullTerminator:
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lda #$00
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jsr SendByte
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DumpOutput:
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jsr GetByte
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bcs skipOutput
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cmp #$00
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beq endOutput
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jsr PrintChar
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skipOutput:
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bit Keyboard ;check for keypress
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bpl DumpOutput ;keep dumping output if no keypress
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lda Keyboard ;send keypress to RPi
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jsr PrintChar
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and #$7f
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jsr SendByte
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bit ClearKeyboard
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clc
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bcc DumpOutput
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endOutput:
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rts
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HelpCommand:
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.byte "a2help",$00
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SendByte:
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pha
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waitWrite:
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lda InputFlags
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rol
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rol
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bcs waitWrite
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pla
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sta OutputByte
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lda #$1e ; set bit 0 low to indicate write started
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sta OutputFlags
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finishWrite:
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lda InputFlags
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rol
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rol
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bcc finishWrite
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lda #$1f
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sta OutputFlags
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rts
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GetByte:
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lda #$1d ;set read flag low
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sta OutputFlags
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waitRead:
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lda InputFlags
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rol
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bcc readByte
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bit Keyboard ;keypress will abort waiting to read
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bpl waitRead
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lda #$1f ;set all flags high and exit
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sta OutputFlags
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sec ;failure
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rts
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readByte:
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lda InputByte
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pha
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lda #$1f ;set all flags high
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sta OutputFlags
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finishRead:
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lda InputFlags
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rol
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bcc finishRead
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pla
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clc ;success
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end:
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clc
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rts
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;macro for string with high-bit set
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.macro aschi str
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.repeat .strlen (str), c
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.byte .strat (str, c) | $80
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.endrep
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.endmacro
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CMD: aschi "rpi"
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CMDLEN = 3 ;Our command length
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;
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NXTCMD: .byte 0,0 ; STORE THE NEXT EXT CMD'S
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; ADDRESS HERE.
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Binary file not shown.
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@ -0,0 +1,179 @@
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ca65 V2.17 - Raspbian 2.17-1
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Main file : RPi.Command.asm
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Current file: RPi.Command.asm
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000000r 1 .ORG $300
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000300 1 INBUF = $200 ;GETLN input buffer.
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000300 1 WAIT = $FCA8 ;Monitor wait routine.
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000300 1 BELL = $FF3A ;Monitor bell routine.
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000300 1 EXTRNCMD = $BE06 ;External cmd JMP vector.
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000300 1 XTRNADDR = $BE50 ;Ext cmd implementation addr.
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000300 1 XLEN = $BE52 ;length of command string-1.
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000300 1 XCNUM = $BE53 ;CI cmd no. (ext cmd - 0).
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000300 1 PBITS = $BE54 ;Command parameter bits.
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000300 1 XRETURN = $BE9E ;Known RTS instruction.
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000300 1 InputByte = $c0fe
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000300 1 OutputByte = $c0fd
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000300 1 InputFlags = $c0fb
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000300 1 OutputFlags = $c0f7
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000300 1
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000300 1 ReadBlockCommand = $01
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000300 1 WriteBlockCommand = $02
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000300 1 GetTimeCommand = $03
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000300 1 ChangeDriveCommand = $04
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000300 1 ExecCommand = $05
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000300 1 LoadFileCommand = $06
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000300 1 SaveFileCommand = $07
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000300 1 MenuCommand = $08
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000300 1
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000300 1 InputString = $fd67
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000300 1 PrintChar = $fded
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000300 1 Keyboard = $c000
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000300 1 ClearKeyboard = $c010
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000300 1 Wait = $fca8
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000300 1
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000300 1 ;
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000300 1 ; FIRST SAVE THE EXTERNAL COMMAND ADDRESS SO YOU WON'T
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000300 1 ; DISCONNECT ANY PREVIOUSLY CONNECTED COMMAND.
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000300 1 ;
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000300 1 AD 07 BE LDA EXTRNCMD+1
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000303 1 8D E1 03 STA NXTCMD
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000306 1 AD 08 BE LDA EXTRNCMD+2
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000309 1 8D E2 03 STA NXTCMD+1
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00030C 1 ;
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00030C 1 A9 17 LDA #<RPI ;Install the address of our
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00030E 1 8D 07 BE STA EXTRNCMD+1 ; command handler in the
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000311 1 A9 03 LDA #>RPI ; external command JMP
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000313 1 8D 08 BE STA EXTRNCMD+2 ; vector.
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000316 1 60 RTS
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000317 1 ;
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000317 1 A2 00 RPI: LDX #0 ;Check for our command.
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000319 1 BD 00 02 NXTCHR: LDA INBUF,X ;Get first character.
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00031C 1 09 20 ora #$20 ;Make it lower case
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00031E 1 DD DE 03 CMP CMD,X ;Does it match?
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000321 1 D0 27 BNE NOTOURS ;No, back to CI.
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000323 1 E8 INX ;Next character
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000324 1 E0 03 CPX #CMDLEN ;All characters yet?
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000326 1 D0 F1 BNE NXTCHR ;No, read next one.
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000328 1 ;
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000328 1 A9 02 LDA #CMDLEN-1 ;Our cmd! Put cmd length-1
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00032A 1 8D 52 BE STA XLEN ; in CI global XLEN.
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00032D 1 A9 BE LDA #>XRETURN ;Point XTRNADDR to a known
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00032F 1 8D 50 BE STA XTRNADDR ; RTS since we'll handle
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000332 1 A9 9E LDA #<XRETURN ; at the time we intercept
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000334 1
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000334 1 8D 51 BE STA XTRNADDR+1 ; our command.
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000337 1 A9 00 LDA #0 ;Mark the cmd number as
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000339 1 8D 53 BE STA XCNUM ; zero (external).
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00033C 1 8D 54 BE STA PBITS ;And indicate no parameters
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00033F 1 8D 55 BE STA PBITS+1 ; to be parsed.
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000342 1 A9 8D lda #$8d
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000344 1 20 ED FD jsr $fded
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000347 1 18 clc
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000348 1 90 04 bcc SendCommand
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00034A 1 ;
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00034A 1 38 NOTOURS: SEC ; ALWAYS SET CARRY IF NOT YOUR
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00034B 1 6C E1 03 JMP (NXTCMD) ; CMD AND LET NEXT COMMAND TRY
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00034E 1 ; ; TO CLAIM IT.
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00034E 1
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00034E 1 SendCommand:
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00034E 1 2C 10 C0 bit ClearKeyboard
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000351 1 A9 05 lda #$05 ;send command 5 = exec
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000353 1 20 96 03 jsr SendByte
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000356 1 A0 03 ldy #$03 ;skip over "RPI"
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000358 1 getInput:
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000358 1 B9 00 02 lda $0200,y
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00035B 1 C9 8D cmp #$8d
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00035D 1 F0 08 beq sendNullTerminator
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00035F 1 29 7F and #$7f
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000361 1 20 96 03 jsr SendByte
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000364 1 C8 iny
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000365 1 D0 F1 bne getInput
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000367 1 sendNullTerminator:
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000367 1 A9 00 lda #$00
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000369 1 20 96 03 jsr SendByte
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00036C 1 DumpOutput:
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00036C 1 20 B4 03 jsr GetByte
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00036F 1 B0 07 bcs skipOutput
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000371 1 C9 00 cmp #$00
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000373 1 F0 19 beq endOutput
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000375 1 20 ED FD jsr PrintChar
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000378 1 skipOutput:
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000378 1 2C 00 C0 bit Keyboard ;check for keypress
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00037B 1 10 EF bpl DumpOutput ;keep dumping output if no keypress
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00037D 1 AD 00 C0 lda Keyboard ;send keypress to RPi
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000380 1 20 ED FD jsr PrintChar
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000383 1 29 7F and #$7f
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000385 1 20 96 03 jsr SendByte
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000388 1 2C 10 C0 bit ClearKeyboard
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00038B 1 18 clc
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00038C 1 90 DE bcc DumpOutput
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00038E 1 endOutput:
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00038E 1 60 rts
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00038F 1
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00038F 1 HelpCommand:
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00038F 1 61 32 68 65 .byte "a2help",$00
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000393 1 6C 70 00
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000396 1
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000396 1 SendByte:
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000396 1 48 pha
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000397 1 waitWrite:
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000397 1 AD FB C0 lda InputFlags
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00039A 1 2A rol
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00039B 1 2A rol
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00039C 1 B0 F9 bcs waitWrite
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00039E 1 68 pla
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00039F 1 8D FD C0 sta OutputByte
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0003A2 1 A9 1E lda #$1e ; set bit 0 low to indicate write started
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0003A4 1 8D F7 C0 sta OutputFlags
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0003A7 1 finishWrite:
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0003A7 1 AD FB C0 lda InputFlags
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0003AA 1 2A rol
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0003AB 1 2A rol
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0003AC 1 90 F9 bcc finishWrite
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0003AE 1 A9 1F lda #$1f
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0003B0 1 8D F7 C0 sta OutputFlags
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0003B3 1 60 rts
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0003B4 1
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0003B4 1 GetByte:
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0003B4 1 A9 1D lda #$1d ;set read flag low
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0003B6 1 8D F7 C0 sta OutputFlags
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0003B9 1 waitRead:
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0003B9 1 AD FB C0 lda InputFlags
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0003BC 1 2A rol
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0003BD 1 90 0C bcc readByte
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0003BF 1 2C 00 C0 bit Keyboard ;keypress will abort waiting to read
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0003C2 1 10 F5 bpl waitRead
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0003C4 1 A9 1F lda #$1f ;set all flags high and exit
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0003C6 1 8D F7 C0 sta OutputFlags
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0003C9 1 38 sec ;failure
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0003CA 1 60 rts
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0003CB 1 readByte:
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0003CB 1 AD FE C0 lda InputByte
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0003CE 1 48 pha
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0003CF 1 A9 1F lda #$1f ;set all flags high
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0003D1 1 8D F7 C0 sta OutputFlags
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0003D4 1 finishRead:
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0003D4 1 AD FB C0 lda InputFlags
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0003D7 1 2A rol
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0003D8 1 90 FA bcc finishRead
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0003DA 1 68 pla
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0003DB 1 18 clc ;success
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0003DC 1 end:
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0003DC 1 18 clc
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0003DD 1 60 rts
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0003DE 1
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0003DE 1
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0003DE 1 ;macro for string with high-bit set
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0003DE 1 .macro aschi str
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0003DE 1 .repeat .strlen (str), c
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0003DE 1 .byte .strat (str, c) | $80
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0003DE 1 .endrep
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0003DE 1 .endmacro
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0003DE 1
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0003DE 1 F2 F0 E9 CMD: aschi "rpi"
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0003E1 1 CMDLEN = 3 ;Our command length
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0003E1 1 ;
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0003E1 1 00 00 NXTCMD: .byte 0,0 ; STORE THE NEXT EXT CMD'S
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0003E3 1 ; ADDRESS HERE.
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0003E3 1
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