mirror of
https://github.com/freitz85/AppleIISd.git
synced 2024-06-28 14:29:58 +00:00
592 lines
15 KiB
ArmAsm
592 lines
15 KiB
ArmAsm
;*******************************
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;
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; Initialize SD card
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;
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;*******************************
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.PC02
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ORG $C800
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SLOT16 = $2B ; s0 -> slot * 16
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CURSLOT = $07F8 ; Cs
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DATA = $C0C0 ; slot 4
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CTRL = DATA+1
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DIV = DATA+2
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SS = DATA+3
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R30 = $0478
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R31 = $04F8
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R32 = $0578
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R33 = $05F8
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CMDLO = $FA
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CMDHI = $FB
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WORK = $3C
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FROM = $FA ; + $fb
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TO = $FC ; + $fd
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SIZE = $FE ; + $ff
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SSNONE = $0F
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SS0 = $0E
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TC = $80
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DUMMY = $FF
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;*******************************
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;
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; Install SD card driver
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;
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;*******************************
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; signature bytes
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ldx #$20
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ldy #$00
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ldx #$03
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stx WORK
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; find slot nr
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jsr $FF58
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tsx
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lda $0100,X
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and #$0F
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ora #$C0
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sta CURSLOT ; $Cs
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asl A
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asl A
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asl A
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asl A
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sta SLOT16 ; $s0
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bit $CFFF
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jsr INIT:
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;
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; TODO: check for init error
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;
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; see if slot has a driver already
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INSTALL: ldx $BF31 ; get devcnt
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INSLP: lda $BF32,X ; get a devnum
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and #$70 ; isolate slot
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cmp SLOT16 ; slot?
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beq INSOUT: ; yes, skip it
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dex
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bpl INSLP: ; keep up the search
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; restore the devnum to the list
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ldx $BF31 ; get devcnt again
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cpx #$0D ; device table full?
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bne INSLP2:
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ERROR: jmp INSOUT: ; do something!
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INSLP2: lda $BF32-1,X ; move all entries down
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sta $BF32,X ; to make room at front
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dex ; for a new entry
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bne INSLP2:
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lda #$04 ; ProFile type device
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ora SLOT16
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sta $BF32 ; slot, drive 1 at top of list
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inc $BF31 ; update devcnt
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; now insert the device driver vector
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lda CURSLOT
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and #$0F
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txa
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lda #<DRIVER:
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sta $BF10,X
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lda CURSLOT
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sta $BF11,X
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INSOUT: rts
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;*******************************
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;
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; Jump table
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;
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;*******************************
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DRIVER: cld
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bit $CFFF
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lda $42 ; get command
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cmp #$00
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beq @STATUS:
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cmp #$01
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beq @READ:
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cmp #$02
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beq @WRITE:
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cmp #$03
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beq @FORMAT:
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sec ; unknown command
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lda #$01
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rts
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@STATUS: jmp STATUS:
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@READ: jmp READ:
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@WRITE: jmp WRITE:
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@FORMAT: jmp FORMAT:
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ORG $C8FC
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.word $FFFF ; 65535 blocks
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.byte $47 ; Status bits
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.byte #<DRIVER: ; LSB of driver
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ORG $C900
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;*******************************
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;
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; Initialize SD card
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;
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; C Clear - No error
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; Set - Error
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; A $00 - No error
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; $27 - I/O error - Init failed
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; $28 - No card inserted
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;
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;*******************************
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INIT: cld
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lda #$03 ; set SPI mode 3
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sta CTRL
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lda #SSNONE
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sta SS
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lda #7
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sta DIV
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ldx #10
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lda #DUMMY
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@LOOP: sta DATA
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@WAIT: bit CTRL
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bpl @WAIT:
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dex
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bne @LOOP: ; do 10 times
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lda #SS0 ; set CS low
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sta SS
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lda #<CMD0 ; send CMD0
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sta CMDLO
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lda #>CMD0
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sta CMDHI
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jsr CMD
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jsr GETR1: ; get response
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cmp #$01
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bne ERROR1: ; error!
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lda #<CMD8 ; send CMD8
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sta CMDLO
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lda #>CMD8
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sta CMDHI
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jsr CMD
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jsr GETR3:
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cmp #$01
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bne SDV1: ; may be SD Ver. 1
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; check for $01aa match!
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SDV2: lda #<CMD55
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sta CMDLO
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lda #>CMD55
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sta CMDHI
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jsr CMD
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jsr GETR1:
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lda #<ACMD41_40
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sta CMDLO
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lda #>ACMD41_40
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sta CMDHI
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jsr CMD
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jsr GETR1:
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cmp #$01
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beq SDV2: ; wait for ready
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cmp #$00
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bne ERROR1: ; error!
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; send CMD58
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; SD Ver. 2 initialized!
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jmp BLOCKSZ:
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ERROR1: jmp IOERROR: ; needed for far jump
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SDV1: lda #<CMD55
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sta CMDLO
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lda #>CMD55
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sta CMDHI
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jsr CMD ; ignore response
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lda #<ACMD41_0
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sta CMDLO
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lda #>ACMD41_0
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sta CMDHI
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jsr CMD
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jsr GETR1:
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cmp #$01
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beq SDV1: ; wait for ready
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cmp #$00
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bne MMC: ; may be MMC card
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; SD Ver. 1 initialized!
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jmp BLOCKSZ:
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MMC: lda #<CMD1
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sta CMDLO
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lda #>CMD1
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sta CMDHI
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@LOOP: jsr CMD
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jsr GETR1:
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cmp #$01
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beq @LOOP: ; wait for ready
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cmp #$00
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bne IOERROR: ; error!
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; MMC Ver. 3 initialized!
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BLOCKSZ: lda #<CMD16
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sta CMDLO
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lda #>CMD16
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sta CMDHI
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jsr CMD
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jsr GETR1:
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cmp #$00
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bne IOERROR: ; error!
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END: clc ; all ok
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ldy #0
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bcc END1:
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CDERROR: sec
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ldy #$28 ; no card error
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bcs END1:
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IOERROR: sec
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ldy #$27 ; init error
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END1: lda #SSNONE ; deselect card
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sta SS
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lda #0
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sta DIV
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tya ; retval in A
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rts
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;*******************************
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;
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; Send SD command
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; Call with command in CMDHI and CMDLO
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;
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;*******************************
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CMD: ldy #0
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@LOOP: lda (CMDLO),Y
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sta DATA
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@WAIT: bit CTRL ; TC is in N
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bpl @WAIT:
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iny
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cpy #6
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bcc @LOOP:
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rts
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;*******************************
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;
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; Get R1
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; R1 is in A
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;
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;*******************************
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GETR1: lda #DUMMY
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sta DATA
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@WAIT: bit CTRL
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bpl @WAIT:
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lda DATA ; get response
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sta R30+SLOT ; save R1
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and #$80
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bne GETR1: ; wait for MSB=0
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lda #DUMMY
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sta DATA ; send another dummy
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lda R30+SLOT ; restore R1
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rts
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;*******************************
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;
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; Get R3
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; R1 is in A
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; R3 is in scratchpad ram
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;
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;*******************************
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GETR3: jsr GETR1: ; get R1 first
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pha ; save R1
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phy ; save Y
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ldy #04
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@LOOP: lda #DUMMY ; send dummy
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sta DATA
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@WAIT: bit CTRL
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bpl @WAIT:
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lda DATA
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pha
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dey
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bne @LOOP: ; do 4 times
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pla
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sta R33+SLOT ; save R3
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pla
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sta R32+SLOT
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pla
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sta R31+SLOT
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pla
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sta R30+SLOT
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ply ; restore Y
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lda #DUMMY
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sta DATA ; send another dummy
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pla ; restore R1
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rts
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;*******************************
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;
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; Status request
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; $43 Unt number DSSS000
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; $44-45 Unused
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; $46-47 Unused
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;
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; C Clear - No error
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; Set - Error
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; A $00 - No error
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; $27 - I/O error
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; $28 - No card inserted / no init
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; $2B - Card write protected
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; X - Blocks avail (low byte)
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; Y - Blocks avail (high byte)
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;
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;*******************************
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STATUS: clc ; no error
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lda #0
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ldx #$FF ; 32 MB partition
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ldy #$FF
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rts
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;
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; TODO: check for card detect and write protect!
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;
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;*******************************
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;
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; Read 512 byte block
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; $43 Unit number DSSS0000
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; $44-45 Address (LO/HI) of buffer
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; $46-47 Block number (LO/HI)
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;
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; C Clear - No error
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; Set - Error
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; A $00 - No error
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; $27 - Bad block number
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; $28 - No card inserted
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;
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;*******************************
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;
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; TODO: check for card detect!
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;
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READ: lda #SS0 ; enable /CS
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sta SS
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lda $46 ; store block num
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sta R33+SLOT ; in R30-R33
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lda $47
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sta R32+SLOT
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stz R31+SLOT
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stz R30+SLOT
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ldy #9
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@LOOP: asl R33+SLOT ; mul block num
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rol R32+SLOT ; by 512 to get
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rol R31+SLOT ; real address
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rol R30+SLOT
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dey
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bne @LOOP:
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lda #$51 ; send CMD17
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sta DATA
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@WAIT: bit CTRL
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bpl @WAIT:
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@ARG: lda R30+SLOT ; get arg from R30 on
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sta DATA
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@WAIT1: bit CTRL
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bpl @WAIT1:
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lda R31+SLOT
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sta DATA
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@WAIT11: bit CTRL
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bpl @WAIT11:
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lda R32+SLOT
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sta DATA
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@WAIT12: bit CTRL
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bpl @WAIT12:
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lda R33+SLOT
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sta DATA
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@WAIT13: bit CTRL
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bpl @WAIT13:
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lda #DUMMY
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sta DATA ; dummy crc
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@WAIT2: bit CTRL
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bpl @WAIT2:
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@GETR1: lda #DUMMY
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sta DATA ; get R1
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@WAIT3: bit CTRL
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bpl @WAIT3:
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lda DATA ; get response
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;
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; TODO: check for error!
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;
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cmp #$FE
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bne @GETR1: ; wait for $FE
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ldx #2 ; read data from card
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@LOOPX: ldy #0
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@LOOPY: lda #DUMMY
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sta DATA
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@WAIT4: bit CTRL
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bpl @WAIT4:
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lda DATA
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sta ($44)
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inc $44
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bne @INCY:
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inc $45 ; inc msb on page boundary
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@INCY: iny
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bne @LOOPY:
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dex
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bne @LOOPX:
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@OK: jsr GETR3: ; read 2 bytes crc
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lda #SSNONE
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sta SS ; disable /CS
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clc ; no error
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lda #$00
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rts
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:ERROR: lda #SSNONE
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sta SS ; disable /CS
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sec ; an error occured
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lda #$27
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rts
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;*******************************
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;
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; Write 512 byte block
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; $43 Unit number DSSS000
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; $44-45 Address (LO/HI) of buffer
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; $46-47 Block number (LO/HI)
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;
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; C Clear - No error
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; Set - Error
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; A $00 - No error
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; $27 - Bad block number
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; $28 - No card inserted
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;
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;*******************************
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;
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; TODO: check for card detect and write protect!
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;
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WRITE: lda #SS0 ; enable /CS
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sta SS
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lda $46 ; store block num
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sta R33+SLOT
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lda $47
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sta R32+SLOT
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stz R31+SLOT
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stz R30+SLOT
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ldy #9
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@LOOP: asl R33+SLOT ; mul block num
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rol R32+SLOT ; by 512 to get
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rol R31+SLOT ; real address
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rol R30+SLOT
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dey
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bne @LOOP:
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lda #$58 ; send CMD24
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sta DATA
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@WAIT: bit CTRL
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bpl @WAIT:
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@ARG: lda R30+SLOT ; get arg from R30 on
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sta DATA
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@WAIT1: bit CTRL
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bpl @WAIT1:
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lda R31+SLOT
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sta DATA
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@WAIT11: bit CTRL
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bpl @WAIT11:
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lda R32+SLOT
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sta DATA
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@WAIT12: bit CTRL
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bpl @WAIT12:
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lda R33+SLOT
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sta DATA
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@WAIT13: bit CTRL
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bpl @WAIT13:
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lda #DUMMY
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sta DATA ; dummy crc
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@WAIT2: bit CTRL
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bpl @WAIT2:
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@GETR1: lda #DUMMY
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sta DATA ; get R1
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@WAIT3: bit CTRL
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bpl @WAIT3:
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lda DATA ; get response
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;
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; TODO: check for error!
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;
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cmp #$FE
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bne @GETR1: ; wait for $FE
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ldx #2 ; send data to card
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@LOOPX: ldy #0
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@LOOPY: lda ($44)
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sta DATA
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@WAIT4: bit CTRL
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bpl @WAIT4:
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inc $44
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bne @INCY:
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inc $45 ; inc msb on page boundary
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@INCY: iny
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bne @LOOPY:
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dex
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bne @LOOPX:
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ldy #2 ; send 2 dummy crc bytes
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@CRC: sta DATA
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@WAIT:5 bit CTRL
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bpl @WAIT:5
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dey
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bne @CRC:
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@OK: lda #SSNONE ; disable /CS
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sta SS
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clc ; no error
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lda #0
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rts
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;*******************************
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;
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; Format
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; not supported!
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;
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;*******************************
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FORMAT: sec
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lda #$01 ; invalid command
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rts
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CMD0 .byte $400000000095
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CMD1 .byte $4100000000F9
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CMD8 .byte $48000001AA87
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CMD16 .byte $5000000200FF
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CMD55 .byte $770000000065
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ACMD41_40 .byte $694000000077
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ACMD41_0 .byte $6900000000FF
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DRIVEND = *
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