ca65 V2.17 - Raspbian 2.17-1 Main file : RPi.Command.asm Current file: RPi.Command.asm 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 = $c0fe 000300 1 OutputByte = $c0fd 000300 1 InputFlags = $c0fb 000300 1 OutputFlags = $c0f7 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 ; 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 E3 03 STA NXTCMD 000306 1 AD 08 BE LDA EXTRNCMD+2 000309 1 8D E4 03 STA NXTCMD+1 00030C 1 ; 00030C 1 A9 17 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 E0 03 CMP CMD,X ;Does it match? 000321 1 D0 27 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 ; 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 18 clc 000348 1 90 04 bcc SendCommand 00034A 1 ; 00034A 1 38 NOTOURS: SEC ; ALWAYS SET CARRY IF NOT YOUR 00034B 1 6C E3 03 JMP (NXTCMD) ; CMD AND LET NEXT COMMAND TRY 00034E 1 ; ; TO CLAIM IT. 00034E 1 00034E 1 SendCommand: 00034E 1 2C 10 C0 bit ClearKeyboard 000351 1 A9 05 lda #$05 ;send command 5 = exec 000353 1 20 99 03 jsr SendByte 000356 1 A0 03 ldy #$03 ;skip over "RPI" 000358 1 getInput: 000358 1 B9 00 02 lda $0200,y 00035B 1 C9 8D cmp #$8d 00035D 1 F0 08 beq sendNullTerminator 00035F 1 29 7F and #$7f 000361 1 20 99 03 jsr SendByte 000364 1 C8 iny 000365 1 D0 F1 bne getInput 000367 1 sendNullTerminator: 000367 1 A9 00 lda #$00 000369 1 20 99 03 jsr SendByte 00036C 1 DumpOutput: 00036C 1 20 B7 03 jsr GetByte 00036F 1 B0 07 bcs skipOutput 000371 1 C9 00 cmp #$00 000373 1 F0 19 beq endOutput 000375 1 20 ED FD jsr PrintChar 000378 1 skipOutput: 000378 1 2C 00 C0 bit Keyboard ;check for keypress 00037B 1 10 EF bpl DumpOutput ;keep dumping output if no keypress 00037D 1 AD 00 C0 lda Keyboard ;send keypress to RPi 000380 1 20 ED FD jsr PrintChar 000383 1 29 7F and #$7f 000385 1 20 99 03 jsr SendByte 000388 1 2C 10 C0 bit ClearKeyboard 00038B 1 18 clc 00038C 1 90 DE bcc DumpOutput 00038E 1 endOutput: 00038E 1 18 clc 00038F 1 6C E3 03 jmp (NXTCMD) 000392 1 000392 1 HelpCommand: 000392 1 61 32 68 65 .byte "a2help",$00 000396 1 6C 70 00 000399 1 000399 1 SendByte: 000399 1 48 pha 00039A 1 waitWrite: 00039A 1 AD FB C0 lda InputFlags 00039D 1 2A rol 00039E 1 2A rol 00039F 1 B0 F9 bcs waitWrite 0003A1 1 68 pla 0003A2 1 8D FD C0 sta OutputByte 0003A5 1 A9 1E lda #$1e ; set bit 0 low to indicate write started 0003A7 1 8D F7 C0 sta OutputFlags 0003AA 1 finishWrite: 0003AA 1 AD FB C0 lda InputFlags 0003AD 1 2A rol 0003AE 1 2A rol 0003AF 1 90 F9 bcc finishWrite 0003B1 1 A9 1F lda #$1f 0003B3 1 8D F7 C0 sta OutputFlags 0003B6 1 60 rts 0003B7 1 0003B7 1 GetByte: 0003B7 1 A9 1D lda #$1d ;set read flag low 0003B9 1 8D F7 C0 sta OutputFlags 0003BC 1 waitRead: 0003BC 1 AD FB C0 lda InputFlags 0003BF 1 2A rol 0003C0 1 90 0C bcc readByte 0003C2 1 2C 00 C0 bit Keyboard ;keypress will abort waiting to read 0003C5 1 10 F5 bpl waitRead 0003C7 1 A9 1F lda #$1f ;set all flags high and exit 0003C9 1 8D F7 C0 sta OutputFlags 0003CC 1 38 sec ;failure 0003CD 1 60 rts 0003CE 1 readByte: 0003CE 1 AD FE C0 lda InputByte 0003D1 1 48 pha 0003D2 1 A9 1F lda #$1f ;set all flags high 0003D4 1 8D F7 C0 sta OutputFlags 0003D7 1 finishRead: 0003D7 1 AD FB C0 lda InputFlags 0003DA 1 2A rol 0003DB 1 90 FA bcc finishRead 0003DD 1 68 pla 0003DE 1 18 clc ;success 0003DF 1 60 rts 0003E0 1 0003E0 1 0003E0 1 ;macro for string with high-bit set 0003E0 1 .macro aschi str 0003E0 1 .repeat .strlen (str), c 0003E0 1 .byte .strat (str, c) | $80 0003E0 1 .endrep 0003E0 1 .endmacro 0003E0 1 0003E0 1 F2 F0 E9 CMD: aschi "rpi" 0003E3 1 CMDLEN = 3 ;Our command length 0003E3 1 ; 0003E3 1 00 00 NXTCMD: .byte 0,0 ; STORE THE NEXT EXT CMD'S 0003E5 1 ; ADDRESS HERE. 0003E5 1