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https://github.com/tjboldt/Apple2-IO-RPi.git
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Add RAM based ProDOS driver for testing
This commit is contained in:
Terence Boldt
parent
7acbbc1d26
commit
8dff6e4765
181
Firmware/Driver.asm
Normal file
181
Firmware/Driver.asm
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@ -0,0 +1,181 @@
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; ProDOS Global Page
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Device2S1 = $bf14 ;POINTER FOR SLOT 2 DRIVE 1 DRIVER
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DeviceCount = $bf31 ;DEVICE COUNT -1
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DeviceList = $bf32 ;DEVICE LIST
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; ProDOS Zero Page
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Command = $42 ;ProDOS Command
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Unit = $43 ;ProDOS unit (SDDD0000)
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BufferLo = $44
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BufferHi = $45
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BlockLo = $46
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BlockHi = $47
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; ProDOS Error Codes
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IOError = $27
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NoDevice = $28
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WriteProtect = $2B
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SlotDrive = $50
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InputByte = $c0de
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OutputByte = $c0dd
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ReadBlockCommand = $01
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WriteBlockCommand = $02
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NibbleStorage = $1d
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.org $1000
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; Register the driver with ProDOS
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lda #<Driver
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sta Device2S1
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lda #>Driver
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sta Device2S1+1
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; Add the drive to the device list
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inc DeviceCount
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lda DeviceCount
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lda #SlotDrive
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sta DeviceList,y
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rts
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; ProDOS Driver code
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; First check that this is the right drive
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Driver:
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lda Unit
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cmp #SlotDrive
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beq DoCommand ;correct device, so proceed
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sec ;set carry as ProDOS treats this as an error
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lda #NoDevice ;put the error code in accumulator for ProDOS
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rts
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; Check which command is being requested
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DoCommand:
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lda Command
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beq GetStatus ;0 = Status command
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cmp #ReadBlockCommand
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beq ReadBlock
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cmp #WriteBlockCommand
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beq WriteBlock
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sec ;set carry as we don't support any other commands
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lda #$53 ;Invalid parameter error
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rts
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; ProDOS Status Command Handler
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GetStatus:
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lda #$00 ;0 indicates ready to read/write
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lda #$ff ;low byte number of blocks
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lda #$ff ;high byte number of blocks
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lda #$0 ;zero accumulator and clear carry for success
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clc
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rts
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; ProDOS Read Block Command
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ReadBlock:
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lda #ReadBlockCommand
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jsr SendCommand
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lda BlockLo
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jsr SendByte
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lda BlockHi
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jsr SendByte
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ldy #$0
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jsr read256
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inc BufferHi
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jsr read256
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dec BufferHi
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lda #$0 ;zero accumulator and clear carry for success
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clc
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rts
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read256:
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jsr GetByte
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sta (BufferLo),y
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iny
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bne read256
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rts
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; ProDOS Write Block Command
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WriteBlock:
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lda #WriteBlockCommand
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jsr SendCommand
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lda BlockLo
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jsr SendByte
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lda BlockHi
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jsr SendByte
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ldy #$0
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jsr write256
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inc BufferHi
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jsr write256
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dec BufferHi
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lda #$0 ;zero accumulator and clear carry for success
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clc
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rts
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write256:
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lda (BufferLo),y
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jsr SendByte
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iny
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bne write256
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rts
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SendCommand:
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ora #$D0 ;Write Hi, Read Hi, Command Write Lo, Command Read Hi
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sta OutputByte
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commandWait:
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lda InputByte
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asl
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asl
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asl
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bmi commandWait
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lda #$F0 ;set write/read/command flags high
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sta OutputByte
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rts
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SendByte:
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pha
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lsr
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lsr
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lsr
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lsr
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jsr SendNibble
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pla
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jsr SendNibble
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rts
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SendNibble:
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and #$0F
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ora #$70 ;Write bit low
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pha
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waitWrite:
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lda InputByte
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asl ;Second highest bit goes low when ready
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bmi waitWrite
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pla
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sta OutputByte
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finishWrite:
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lda InputByte
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asl
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bpl finishWrite
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rts
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GetByte:
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jsr GetNibble
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asl
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asl
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asl
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asl
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sta NibbleStorage
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jsr GetNibble
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and #$0f
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ora NibbleStorage
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lda NibbleStorage
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rts
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GetNibble:
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lda #$b0 ;set read flag low
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sta OutputByte
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waitRead:
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lda InputByte
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bmi waitRead
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and #$f0 ;set all flags high
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sta OutputByte
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rts
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186
Firmware/Driver.lst
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186
Firmware/Driver.lst
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@ -0,0 +1,186 @@
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ca65 V2.18 - Ubuntu 2.18-1
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Main file : Driver.asm
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Current file: Driver.asm
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000000r 1 ; ProDOS Global Page
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000000r 1 Device2S1 = $bf14 ;POINTER FOR SLOT 2 DRIVE 1 DRIVER
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000000r 1 DeviceCount = $bf31 ;DEVICE COUNT -1
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000000r 1 DeviceList = $bf32 ;DEVICE LIST
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000000r 1
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000000r 1 ; ProDOS Zero Page
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000000r 1 Command = $42 ;ProDOS Command
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000000r 1 Unit = $43 ;ProDOS unit (SDDD0000)
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000000r 1 BufferLo = $44
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000000r 1 BufferHi = $45
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000000r 1 BlockLo = $46
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000000r 1 BlockHi = $47
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000000r 1
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000000r 1 ; ProDOS Error Codes
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000000r 1 IOError = $27
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000000r 1 NoDevice = $28
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000000r 1 WriteProtect = $2B
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000000r 1
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000000r 1 SlotDrive = $50
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000000r 1 InputByte = $c0de
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000000r 1 OutputByte = $c0dd
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000000r 1 ReadBlockCommand = $01
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000000r 1 WriteBlockCommand = $02
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000000r 1 NibbleStorage = $1d
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000000r 1
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000000r 1 .org $1000
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001000 1
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001000 1 ; Register the driver with ProDOS
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001000 1 A9 16 lda #<Driver
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001002 1 8D 14 BF sta Device2S1
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001005 1 A9 10 lda #>Driver
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001007 1 8D 15 BF sta Device2S1+1
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00100A 1 ; Add the drive to the device list
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00100A 1 EE 31 BF inc DeviceCount
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00100D 1 AD 31 BF lda DeviceCount
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001010 1 A9 50 lda #SlotDrive
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001012 1 99 32 BF sta DeviceList,y
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001015 1 60 rts
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001016 1
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001016 1 ; ProDOS Driver code
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001016 1 ; First check that this is the right drive
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001016 1 Driver:
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001016 1 A5 43 lda Unit
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001018 1 C9 50 cmp #SlotDrive
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00101A 1 F0 04 beq DoCommand ;correct device, so proceed
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00101C 1 38 sec ;set carry as ProDOS treats this as an error
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00101D 1 A9 28 lda #NoDevice ;put the error code in accumulator for ProDOS
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00101F 1 60 rts
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001020 1
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001020 1 ; Check which command is being requested
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001020 1 DoCommand:
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001020 1 A5 42 lda Command
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001022 1 F0 0C beq GetStatus ;0 = Status command
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001024 1 C9 01 cmp #ReadBlockCommand
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001026 1 F0 12 beq ReadBlock
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001028 1 C9 02 cmp #WriteBlockCommand
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00102A 1 F0 36 beq WriteBlock
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00102C 1 38 sec ;set carry as we don't support any other commands
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00102D 1 A9 53 lda #$53 ;Invalid parameter error
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00102F 1 60 rts
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001030 1
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001030 1 ; ProDOS Status Command Handler
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001030 1 GetStatus:
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001030 1 A9 00 lda #$00 ;0 indicates ready to read/write
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001032 1 A9 FF lda #$ff ;low byte number of blocks
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001034 1 A9 FF lda #$ff ;high byte number of blocks
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001036 1 A9 00 lda #$0 ;zero accumulator and clear carry for success
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001038 1 18 clc
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001039 1 60 rts
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00103A 1
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00103A 1 ; ProDOS Read Block Command
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00103A 1 ReadBlock:
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00103A 1 A9 01 lda #ReadBlockCommand
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00103C 1 20 8A 10 jsr SendCommand
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00103F 1 A5 46 lda BlockLo
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001041 1 20 9D 10 jsr SendByte
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001044 1 A5 47 lda BlockHi
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001046 1 20 9D 10 jsr SendByte
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001049 1 A0 00 ldy #$0
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00104B 1 20 59 10 jsr read256
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00104E 1 E6 45 inc BufferHi
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001050 1 20 59 10 jsr read256
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001053 1 C6 45 dec BufferHi
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001055 1 A9 00 lda #$0 ;zero accumulator and clear carry for success
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001057 1 18 clc
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001058 1 60 rts
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001059 1
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001059 1 read256:
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001059 1 20 C0 10 jsr GetByte
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00105C 1 91 44 sta (BufferLo),y
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00105E 1 C8 iny
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00105F 1 D0 F8 bne read256
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001061 1 60 rts
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001062 1
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001062 1 ; ProDOS Write Block Command
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001062 1 WriteBlock:
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001062 1 A9 02 lda #WriteBlockCommand
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001064 1 20 8A 10 jsr SendCommand
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001067 1 A5 46 lda BlockLo
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001069 1 20 9D 10 jsr SendByte
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00106C 1 A5 47 lda BlockHi
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00106E 1 20 9D 10 jsr SendByte
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001071 1 A0 00 ldy #$0
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001073 1 20 81 10 jsr write256
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001076 1 E6 45 inc BufferHi
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001078 1 20 81 10 jsr write256
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00107B 1 C6 45 dec BufferHi
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00107D 1 A9 00 lda #$0 ;zero accumulator and clear carry for success
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00107F 1 18 clc
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001080 1 60 rts
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001081 1
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001081 1 write256:
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001081 1 B1 44 lda (BufferLo),y
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001083 1 20 9D 10 jsr SendByte
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001086 1 C8 iny
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001087 1 D0 F8 bne write256
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001089 1 60 rts
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00108A 1
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00108A 1 SendCommand:
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00108A 1 09 D0 ora #$D0 ;Write Hi, Read Hi, Command Write Lo, Command Read Hi
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00108C 1 8D DD C0 sta OutputByte
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00108F 1 commandWait:
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00108F 1 AD DE C0 lda InputByte
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001092 1 0A asl
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001093 1 0A asl
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001094 1 0A asl
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001095 1 30 F8 bmi commandWait
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001097 1 A9 F0 lda #$F0 ;set write/read/command flags high
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001099 1 8D DD C0 sta OutputByte
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00109C 1 60 rts
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00109D 1
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00109D 1 SendByte:
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00109D 1 48 pha
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00109E 1 4A lsr
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00109F 1 4A lsr
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0010A0 1 4A lsr
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0010A1 1 4A lsr
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0010A2 1 20 AA 10 jsr SendNibble
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0010A5 1 68 pla
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0010A6 1 20 AA 10 jsr SendNibble
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0010A9 1 60 rts
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0010AA 1
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0010AA 1 SendNibble:
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0010AA 1 29 0F and #$0F
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0010AC 1 09 70 ora #$70 ;Write bit low
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0010AE 1 48 pha
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0010AF 1 waitWrite:
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0010AF 1 AD DE C0 lda InputByte
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0010B2 1 0A asl ;Second highest bit goes low when ready
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0010B3 1 30 FA bmi waitWrite
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0010B5 1 68 pla
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0010B6 1 8D DD C0 sta OutputByte
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0010B9 1 finishWrite:
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0010B9 1 AD DE C0 lda InputByte
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0010BC 1 0A asl
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0010BD 1 10 FA bpl finishWrite
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0010BF 1 60 rts
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0010C0 1
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0010C0 1 GetByte:
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0010C0 1 20 D3 10 jsr GetNibble
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0010C3 1 0A asl
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0010C4 1 0A asl
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0010C5 1 0A asl
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0010C6 1 0A asl
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0010C7 1 85 1D sta NibbleStorage
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0010C9 1 20 D3 10 jsr GetNibble
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0010CC 1 29 0F and #$0f
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0010CE 1 05 1D ora NibbleStorage
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0010D0 1 A5 1D lda NibbleStorage
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0010D2 1 60 rts
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0010D3 1
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0010D3 1 GetNibble:
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0010D3 1 A9 B0 lda #$b0 ;set read flag low
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0010D5 1 8D DD C0 sta OutputByte
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0010D8 1 waitRead:
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0010D8 1 AD DE C0 lda InputByte
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0010DB 1 30 FB bmi waitRead
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0010DD 1 29 F0 and #$f0 ;set all flags high
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0010DF 1 8D DD C0 sta OutputByte
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0010E2 1 60 rts
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0010E3 1
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0010E3 1
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