******************************** * * Apple][Sd Firmware * Version 0.6 * * (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 $C800 ; Expansion ROM FIN * Memory defines SLOT16 = $2B ; $s0 -> slot * 16 WORK = $3C SLOT = $3D ; $0s CMDLO = $40 CMDHI = $41 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 CARDDET = $40 INITED = $80 * signature bytes LDX #$20 LDY #$00 LDX #$03 STX WORK * find slot nr DO DEBUG LDA #$04 STA SLOT LDA #$C4 STA CURSLOT LDA #$40 STA SLOT16 ELSE JSR $FF58 TSX LDA $0100,X AND #$0F STA SLOT ; $0s ORA #$C0 STA CURSLOT ; $Cs ASL A ASL A ASL A ASL A STA SLOT16 ; $s0 FIN TAX ; X holds now SLOT16 BIT $CFFF JSR INIT * * TODO: check for init error * ******************************** * * 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 LDA #$01 STA $42 ; load command LDA SLOT16 TAX STA $43 ; slot number STZ $44 ; buffer lo LDA #$08 STA $45 ; buffer hi STZ $46 ; block lo STZ $47 ; block hi BIT $CFFF JSR READ ; call driver JMP $801 ; goto bootloader FIN ******************************** * * Jump table * ******************************** DRIVER CLD DO DEBUG LDA #$04 STA SLOT LDA #$C4 STA CURSLOT LDA #$40 STA SLOT16 ELSE JSR $FF58 ; find slot nr TSX LDA $0100,X AND #$0F STA SLOT ; $0s ORA #$C0 STA CURSLOT ; $Cs ASL A ASL A ASL A ASL A STA SLOT16 ; $s0 FIN TAX ; X holds now SLOT16 BIT $CFFF LDA #INITED ; check for init BIT SS,X BEQ :INIT :CMD LDA $42 ; get command CMP #$00 BEQ :STATUS CMP #$01 BEQ :READ CMP #$02 BEQ :WRITE CMP #$03 BEQ :FORMAT SEC ; unknown command LDA #$01 RTS :STATUS JMP STATUS :READ JMP READ :WRITE JMP WRITE :FORMAT JMP FORMAT :INIT JSR INIT BRA :CMD * Signature bytes DS \ ; fill with zeroes DS -4 ; locate to $xxFC DW $FFFF ; 65535 blocks DB $47 ; Status bits DB #CMD0 STA CMDHI JSR CMD JSR GETR1 ; get response CMP #$01 BNE :ERROR1 ; error! LDA #CMD8 STA CMDHI JSR CMD JSR GETR3 CMP #$01 BNE :SDV1 ; may be SD Ver. 1 * check for $01aa match! :SDV2 LDA #CMD55 STA CMDHI JSR CMD JSR GETR1 LDA #ACMD4140 STA CMDHI JSR CMD JSR GETR1 CMP #$01 BEQ :SDV2 ; wait for ready CMP #$00 BNE :ERROR1 ; error! * send CMD58 * SD Ver. 2 initialized! JMP :BLOCKSZ :ERROR1 JMP :IOERROR ; needed for far jump :SDV1 LDA #CMD55 STA CMDHI JSR CMD ; ignore response LDA #ACMD410 STA CMDHI JSR CMD JSR GETR1 CMP #$01 BEQ :SDV1 ; wait for ready CMP #$00 BNE :MMC ; may be MMC card * SD Ver. 1 initialized! JMP :BLOCKSZ :MMC LDA #CMD1 STA CMDHI :LOOP1 JSR CMD JSR GETR1 CMP #$01 BEQ :LOOP1 ; wait for ready CMP #$00 BNE :IOERROR ; error! * MMC Ver. 3 initialized! :BLOCKSZ LDA #CMD16 STA CMDHI JSR CMD JSR GETR1 CMP #$00 BNE :IOERROR ; error! :END LDY SLOT 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 :CDERROR SEC LDY #$28 ; no card error BCS :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 * ******************************** CMD 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 STA WORK ; save R1 AND #$80 BNE GETR1 ; wait for MSB=0 LDA #DUMMY STA DATA,X ; send another dummy LDA WORK ; 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 * Block no is in $46-47 * Address is in R30-R33 * ******************************** BLOCK PHX ; save X PHY ; save Y LDX SLOT LDA $46 ; store block num STA R33,X ; in R30-R33 LDA $47 STA R32,X LDA #0 STA R31,X STA R30,X 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 ******************************** * * Status request * $43 Unit number DSSS000 * $44-45 Unused * $46-47 Unused * * C Clear - No error * Set - Error * A $00 - No error * $27 - I/O error * $28 - No card inserted / no init * $2B - Card write protected * x - Blocks avail (low byte) * y - Blocks avail (high byte) * ******************************** STATUS CLC ; no error LDA #0 LDX #$FF ; 32 MB partition LDY #$FF RTS * TODO: check for card detect and write protect! ******************************** * * 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 * $28 - No card inserted * ******************************** * TODO: check for card detect! READ JSR BLOCK ; calc block address LDA SS,X ; enable /CS AND #$FF!SS0 STA SS,X LDA #$51 ; send CMD17 JSR COMMAND ; send command CMP #0 ; check for error BNE :ERROR :GETTOK LDA #DUMMY ; get data token STA DATA,X LDA DATA,X ; get response CMP #$FE BNE :GETTOK ; wait for $FE LDY #2 ; read data from card LDA CTRL,X ; enable FRX ORA #FRX STA CTRL,X LDA #DUMMY STA DATA,X :LOOPY STZ WORK :LOOPW LDA DATA,X STA ($44) INC $44 BNE :INW INC $45 ; inc msb on page boundary :INW INC WORK BNE :LOOPW DEY BNE :LOOPY LDA CTRL,X ; disable FRX AND #$FF!FRX STA CTRL,X :CRC LDA #DUMMY ; first crc byte has STA DATA,X ; already been read LDA SS,X ORA #SS0 STA SS,X ; disable /CS CLC ; no error LDA #$00 RTS :ERROR LDA SS,X ORA #SS0 STA SS,X ; disable /CS SEC ; an error occured LDA #$27 RTS ******************************** * * Write 512 byte block * $43 Unit number DSSS000 * $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 * $28 - No card inserted * $2B - Card write protected * ******************************** * TODO: check for card detect and write protect! WRITE JSR BLOCK ; calc block address LDA SS,X ; enable /CS AND #$FF!SS0 STA SS,X LDA #$58 ; send CMD24 JSR COMMAND ; send command CMP #0 ; check for error BNE :ERROR LDA #DUMMY STA DATA,X ; send dummy LDA #$FE STA DATA,X ; send data token LDY #2 ; send data to card :LOOPY STZ WORK :LOOPW LDA ($44) STA DATA,X INC $44 BNE :INW INC $45 ; inc msb on page boundary :INW INC WORK BNE :LOOPW DEY BNE :LOOPY :CRC 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 :ERROR ; check for write error :WAIT6 LDA #DUMMY STA DATA,X ; wait for write cycle LDA DATA,X ; to complete CMP #$00 BEQ :WAIT6 LDA SS,X ; disable /CS ORA #SS0 STA SS,X CLC ; no error LDA #0 RTS :ERROR LDA #DUMMY STA DATA,X ; wait for write cycle LDA DATA,X ; to complete CMP #$00 BEQ :ERROR LDA SS,X ORA #SS0 STA SS,X ; disable /CS SEC ; an error occured LDA #$27 RTS ******************************** * * Format * not supported! * ******************************** FORMAT SEC LDA #$01 ; invalid command RTS 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