******************************** * * Apple][Sd Firmware * Version 0.8 * * (c) Florian Reitz, 2017 * * X register usually contains SLOT16 * Y register is used for counting or SLOT * ******************************** DAT XC ; enable 65C02 code DEBUG = 0 DO DEBUG ORG $8000 ELSE ORG $C700 ; Expansion ROM FIN * Memory defines SLOT16 = $2B ; $s0 -> slot * 16 SLOT = $3D ; $0s CMDLO = $40 CMDHI = $41 DCMD = $42 ; Command code BUFFER = $44 ; Buffer address BLOCK = $46 ; Block number CURSLOT = $07F8 ; $Cs DATA = $C080 CTRL = DATA+1 DIV = DATA+2 SS = DATA+3 R30 = $0478 R31 = $04F8 R32 = $0578 R33 = $05F8 * Constants DUMMY = $FF FRX = $10 ; CTRL register ECE = $04 SS0 = $01 ; SS register WP = $20 CD = $40 INITED = $80 * signature bytes LDX #$20 LDY #$00 LDX #$03 LDY #$3C * find slot nr DO DEBUG LDA #$04 STA SLOT LDA #$C4 STA CURSLOT LDA #$40 ELSE JSR $FF58 TSX LDA $0100,X STA CURSLOT ; $Cs AND #$0F STA SLOT ; $0s ASL A ASL A ASL A ASL A FIN STA SLOT16 ; $s0 TAX ; X holds now SLOT16 BIT $CFFF JSR CARDDET BCC :INIT LDA #$2F ; no card inserted BRK :INIT JSR INIT ******************************** * * Install SD card driver * ******************************** DO DEBUG * see if slot has a driver already LDX $BF31 ; get devcnt INSTALL LDA $BF32,X ; get a devnum AND #$70 ; isolate slot CMP SLOT16 ; slot? BEQ :INSOUT ; yes, skip it DEX BPL INSTALL ; keep up the search * restore the devnum to the list LDX $BF31 ; get devcnt again CPX #$0D ; device table full? BNE :INST2 JSR $FF3A ; bell JMP :INSOUT ; do something! :INST2 LDA $BF32-1,X ; move all entries down STA $BF32,X ; to make room at front DEX ; for a new entry BNE :INST2 LDA #$04 ; ProFile type device ORA SLOT16 STA $BF32 ; slot, drive 1 at top of list INC $BF31 ; update devcnt * now insert the device driver vector LDA SLOT ASL TAX LDA #DRIVER STA $BF11,X :INSOUT RTS ******************************** * * Boot from SD card * ******************************** ELSE BOOT BEQ :DRAW ; check for error BRK :DRAW LDY #0 ; display copyright message :DRAW1 LDA TEXT,Y BEQ :BOOT1 ; check for NULL STA $07D0,Y ; put on last line INY BPL :DRAW1 :BOOT1 LDA #$01 STA DCMD ; load command LDX SLOT16 STX $43 ; slot number LDA #$08 STA BUFFER+1 ; buffer hi STZ BUFFER ; buffer lo STZ BLOCK+1 ; block hi STZ BLOCK ; block lo BIT $CFFF JSR READ ; call driver LDA #$01 STA DCMD ; load command LDX SLOT16 STX $43 ; slot number LDA #$0A STA BUFFER+1 ; buffer hi STZ BUFFER ; buffer lo STZ BLOCK+1 ; block hi LDA #$01 STA BLOCK ; block lo BIT $CFFF JSR READ ; call driver LDX SLOT16 JMP $801 ; goto bootloader FIN ******************************** * * Jump table * ******************************** DRIVER CLD :SAVEZP PHA ; make room for retval LDA SLOT16 ; save all ZP locations PHA LDA SLOT PHA LDA CMDLO PHA LDA CMDHI PHA DO DEBUG LDA #$04 STA SLOT LDA #$C4 STA CURSLOT LDA #$40 ELSE JSR $FF58 ; find slot nr TSX LDA $0100,X STA CURSLOT ; $Cs AND #$0F STA SLOT ; $0s ASL A ASL A ASL A ASL A FIN STA SLOT16 ; $s0 TAX ; X holds now SLOT16 BIT $CFFF JSR CARDDET BCC :INITED LDA #$2F ; no card inserted SEC BRA :RESTZP :INITED LDA #INITED ; check for init BIT SS,X BEQ :INIT :CMD LDA DCMD ; get command CMP #0 BEQ :STATUS CMP #1 BEQ :READ CMP #2 BEQ :WRITE CMP #3 BEQ :FORMAT CMP #$FF BEQ :TEST LDA #1 ; unknown command SEC BRA :RESTZP :STATUS JSR STATUS BRA :RESTZP :READ JSR READ BRA :RESTZP :WRITE JSR WRITE BRA :RESTZP :FORMAT JSR FORMAT BRA :RESTZP :TEST JSR TEST ; do device test BRA :RESTZP :INIT JSR INIT BCC :CMD ; init ok :RESTZP TSX STA $105,X ; save retval on stack PLA ; restore all ZP locations STA CMDHI PLA STA CMDLO PLA STA SLOT PLA STA SLOT16 PLA ; get retval RTS * Signature bytes DS \ ; fill with zeroes DS -4 ; locate to $xxFC DW $0 ; use status call DB $07 ; Status bits DB #CMD0 STA CMDHI JSR SDCMD JSR GETR1 ; get response CMP #$01 BNE :ERROR1 ; error! LDA #CMD8 STA CMDHI JSR SDCMD JSR GETR3 CMP #$01 BNE :SDV1 ; may be SD Ver. 1 * check for $01aa match! :SDV2 LDA #CMD55 STA CMDHI JSR SDCMD JSR GETR1 LDA #ACMD4140 STA CMDHI JSR SDCMD JSR GETR1 CMP #$01 BEQ :SDV2 ; wait for ready CMP #0 BNE :ERROR1 ; error! * send CMD58 * SD Ver. 2 initialized! JMP :BLOCKSZ :ERROR1 JMP :IOERROR ; needed for far jump :SDV1 LDA #CMD55 STA CMDHI JSR SDCMD ; ignore response LDA #ACMD410 STA CMDHI JSR SDCMD JSR GETR1 CMP #$01 BEQ :SDV1 ; wait for ready CMP #0 BNE :MMC ; may be MMC card * SD Ver. 1 initialized! JMP :BLOCKSZ :MMC LDA #CMD1 STA CMDHI :LOOP1 JSR SDCMD JSR GETR1 CMP #$01 BEQ :LOOP1 ; wait for ready CMP #0 BNE :IOERROR ; error! * MMC Ver. 3 initialized! :BLOCKSZ LDA #CMD16 STA CMDHI JSR SDCMD JSR GETR1 CMP #0 BNE :IOERROR ; error! :END LDA SS,X ORA #INITED ; initialized STA SS,X LDA CTRL,X ORA #ECE ; enable 7MHz STA CTRL,X CLC ; all ok LDY #0 BCC :END1 :IOERROR SEC LDY #$27 ; init error :END1 LDA SS,X ; set CS high ORA #SS0 STA SS,X LDA #0 ; set div to 2 STA DIV,X TYA ; retval in A RTS ******************************** * * Send SD command * Call with command in CMDHI and CMDLO * ******************************** SDCMD PHY LDY #0 :LOOP LDA (CMDLO),Y STA DATA,X :WAIT BIT CTRL,X ; TC is in N BPL :WAIT INY CPY #6 BCC :LOOP PLY RTS ******************************** * * Get R1 * R1 is in A * ******************************** GETR1 LDA #DUMMY STA DATA,X :WAIT BIT CTRL,X BPL :WAIT LDA DATA,X ; get response BIT #$80 BNE GETR1 ; wait for MSB=0 PHA LDA #DUMMY STA DATA,X ; send another dummy PLA ; restore R1 RTS ******************************** * * Get R3 * R1 is in A * R3 is in scratchpad ram * ******************************** GETR3 JSR GETR1 ; get R1 first PHA ; save R1 PHY ; save Y LDY #04 ; load counter :LOOP LDA #DUMMY ; send dummy STA DATA,X :WAIT BIT CTRL,X BPL :WAIT LDA DATA,X PHA DEY BNE :LOOP ; do 4 times LDY SLOT PLA STA R33,Y ; save R3 PLA STA R32,Y PLA STA R31,Y PLA STA R30,Y PLY ; restore Y LDA #DUMMY STA DATA,X ; send another dummy PLA ; restore R1 RTS ******************************** * * Calculate block address * Unit number is in $43 DSSS0000 * Block no is in $46-47 * Address is in R30-R33 * ******************************** GETBLOCK PHX ; save X PHY ; save Y LDX SLOT LDA BLOCK ; store block num STA R33,X ; in R30-R33 LDA BLOCK+1 STA R32,X LDA #0 STA R31,X STA R30,X LDA #$80 ; drive number BIT $43 BEQ :SHIFT ; D1 LDA #1 ; D2 STA R31,X :SHIFT LDY #9 ; ASL can't be used with Y :LOOP ASL R33,X ; mul block num ROL R32,X ; by 512 to get ROL R31,X ; real address ROL R30,X DEY BNE :LOOP PLY ; restore Y PLX ; restore X RTS ******************************** * * Send SD command * Cmd is in A * ******************************** COMMAND PHY ; save Y LDY SLOT STA DATA,X ; send command LDA R30,Y ; get arg from R30 on STA DATA,X LDA R31,Y STA DATA,X LDA R32,Y STA DATA,X LDA R33,Y STA DATA,X LDA #DUMMY STA DATA,X ; dummy crc JSR GETR1 PLY ; restore Y RTS ******************************** * * Check for card detect * * C Clear - card in slot * Set - no card in slot * ******************************** CARDDET PHA LDA #CD ; 0: card in BIT SS,X ; 1: card out CLC BEQ :DONE ; card is in SEC ; card is out :DONE PLA RTS ******************************** * * Check for write protect * * C Clear - card not protected * Set - card write protected * ******************************** WRPROT PHA LDA #WP ; 0: write enabled BIT SS,X ; 1: write disabled CLC BEQ :DONE SEC :DONE PLA RTS ******************************** * * Status request * $43 Unit number DSSS000 * $44-45 Unused * $46-47 Unused * * C Clear - No error * Set - Error * A $00 - No error * $2B - Card write protected * $2F - No card inserted * X - Blocks avail (low byte) * Y - Blocks avail (high byte) * ******************************** STATUS LDA #0 ; no error LDX #$FF ; 32 MB partition LDY #$FF JSR WRPROT BCC :DONE LDA #$2B ; card write protected :DONE RTS ******************************** * * Read 512 byte block * $43 Unit number DSSS0000 * $44-45 Address (LO/HI) of buffer * $46-47 Block number (LO/HI) * * C Clear - No error * Set - Error * A $00 - No error * $27 - Bad block number * ******************************** READ JSR GETBLOCK ; calc block address LDA SS,X ; enable /CS AND #$FF!SS0 STA SS,X LDA #$51 ; send CMD17 JSR COMMAND ; send command BNE :ERROR ; check for error :GETTOK LDA #DUMMY ; get data token STA DATA,X LDA DATA,X ; get response CMP #$FE BNE :GETTOK ; wait for $FE LDA CTRL,X ; enable FRX ORA #FRX STA CTRL,X LDA #DUMMY STA DATA,X LDY #0 :LOOP1 LDA DATA,X ; read data from card STA (BUFFER),Y INY BNE :LOOP1 INC BUFFER+1 ; inc msb on page boundary :LOOP2 LDA DATA,X STA (BUFFER),Y INY BNE :LOOP2 DEC BUFFER+1 :CRC LDA DATA,X ; read two bytes crc LDA DATA,X ; and ignore LDA DATA,X ; read a dummy byte LDA CTRL,X ; disable FRX AND #$FF!FRX STA CTRL,X CLC ; no error LDA #0 :DONE PHP PHA LDA SS,X ORA #SS0 STA SS,X ; disable /CS PLA PLP RTS :ERROR SEC ; an error occured LDA #$27 BRA :DONE ******************************** * * Write 512 byte block * $43 Unit number DSSS0000 * $44-45 Address (LO/HI) of buffer * $46-47 Block number (LO/HI) * * C Clear - No error * Set - Error * A $00 - No error * $27 - I/O error or bad block number * $2B - Card write protected * ******************************** WRITE JSR WRPROT BCS :WPERROR ; card write protected JSR GETBLOCK ; calc block address LDA SS,X ; enable /CS AND #$FF!SS0 STA SS,X LDA #$58 ; send CMD24 JSR COMMAND ; send command BNE :IOERROR ; check for error LDA #DUMMY STA DATA,X ; send dummy LDA #$FE STA DATA,X ; send data token LDY #0 :LOOP1 LDA (BUFFER),Y STA DATA,X : INY BNE :LOOP1 INC BUFFER+1 : :LOOP2 LDA (BUFFER),Y STA DATA,X INY BNE :LOOP2 DEC BUFFER+1 :CRC LDA #DUMMY STA DATA,X ; send 2 dummy crc bytes STA DATA,X STA DATA,X ; get data response LDA DATA,X AND #$1F CMP #$05 BNE :IOERROR ; check for write error CLC ; no error LDA #0 :DONE PHP PHA :WAIT LDA #DUMMY STA DATA,X ; wait for write cycle LDA DATA,X ; to complete BEQ :WAIT LDA SS,X ; disable /CS ORA #SS0 STA SS,X PLA PLP RTS :IOERROR SEC ; an error occured LDA #$27 BRA :DONE :WPERROR SEC LDA #$2B BRA :DONE ******************************** * * Format * not supported! * ******************************** FORMAT SEC LDA #$01 ; invalid command RTS ******************************** * * Test routine * ******************************** TEST LDA SLOT16 PHA LDA SLOT PHA * get buffer LDA #2 ; get 512 byte buffer JSR $BEF5 ; call GETBUFR BCS :ERROR STA BUFFER+1 STZ BUFFER PLA STA SLOT PLA STA SLOT16 * fill buffer LDY #0 :LOOP TYA STA (BUFFER),Y INY BNE :LOOP INC BUFFER+1 :LOOP1 TYA STA (BUFFER),Y INY BNE :LOOP1 DEC BUFFER+1 STZ BLOCK ; block number STZ BLOCK+1 LDX SLOT16 * write to card JSR WRITE BCS :ERROR * read from card JSR READ BCS :ERROR * check for errors LDY #0 :LOOP2 TYA CMP (BUFFER),Y BNE :ERRCMP ; error in buffer INY BNE :LOOP2 INC BUFFER+1 :LOOP3 TYA CMP (BUFFER),Y BNE :ERRCMP INY BNE :LOOP3 DEC BUFFER+1 * free buffer JSR $BEF8 ; call FREEBUFR CLC LDA #0 RTS :ERROR BRK :ERRCMP BRK TEXT ASC "Apple][Sd (c)2017 Florian Reitz",00 CMD0 HEX 400000 HEX 000095 CMD1 HEX 410000 HEX 0000F9 CMD8 HEX 480000 HEX 01AA87 CMD16 HEX 500000 HEX 0200FF CMD55 HEX 770000 HEX 000065 ACMD4140 HEX 694000 HEX 000077 ACMD410 HEX 690000 HEX 0000FF