******************************** * * Apple][Sd Firmware * Version 0.5 * * (c) Florian Reitz, 2017 * * X register usually contains SLOT16 * Y register is used for counting or SLOT * ******************************** DAT XC ; enable 65C02 code DEBUG = 1 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 SSNONE = $0F SS0 = $0E DUMMY = $FF ******************************** * * Install SD card driver * ******************************** * 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 JSR INIT BIT $CFFF * * TODO: check for init error * * see if slot has a driver already LDX $BF31 ; get devcnt INSLP LDA $BF32,X ; get a devnum AND #$70 ; isolate slot CMP SLOT16 ; slot? BEQ INSOUT ; yes, skip it DEX BPL INSLP ; keep up the search * restore the devnum to the list LDX $BF31 ; get devcnt again CPX #$0D ; device table full? BNE INSLP2 JSR $FF3A ; bell JMP INSOUT ; do something! INSLP2 LDA $BF32-1,X ; move all entries down STA $BF32,X ; to make room at front DEX ; for a new entry BNE INSLP2 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 ELSE LDA CURSLOT FIN STA $BF11,X INSOUT RTS ******************************** * * 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 $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 * Signature bytes DS \ ; fill with zeroes DS -4 ; locate to $C8FC 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 CLC ; all ok LDY #0 BCC :END1 :CDERROR SEC LDY #$28 ; no card error BCS :END1 :IOERROR SEC LDY #$27 ; init error :END1 LDA #SSNONE ; deselect card 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 PHY ; save Y LDY SLOT LDA $46 ; store block num STA R33,Y ; in R30-R33 LDA $47 STA R32,Y LDA #0 STA R31,Y STA R30,Y PHX LDY #9 LDX SLOT ; ASL can't be done with Y :LOOP ASL R33,X ; mul block num ROL R32,X ; by 512 to get ROL R31,X ; real address ROL R30,X DEY BNE :LOOP PLX PLY ; restore Y RTS ******************************** * * Send SD command * Cmd is in A * ******************************** COMMAND PHY ; save Y LDY SLOT STA DATA,X ; send command :WAIT BIT CTRL,X BPL :WAIT :ARG LDA R30,Y ; get arg from R30 on STA DATA,X :WAIT1 BIT CTRL,X BPL :WAIT1 LDA R31,Y STA DATA,X :WAIT11 BIT CTRL,X BPL :WAIT11 LDA R32,Y STA DATA,X :WAIT12 BIT CTRL,X BPL :WAIT12 LDA R33,Y STA DATA,X :WAIT13 BIT CTRL,X BPL :WAIT13 LDA #DUMMY STA DATA,X ; dummy crc :WAIT2 BIT CTRL,X BPL :WAIT2 :GETR1 LDA #DUMMY STA DATA,X ; get R1 :WAIT3 BIT CTRL,X BPL :WAIT3 LDA DATA,X ; get response * * TODO: check for error! * CMP #$FE BNE :GETR1 ; wait for $FE 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 #SS0 ; enable /CS STA SS,X LDA #$51 ; send CMD17 JSR COMMAND ; send command PHY LDY #2 ; read data from card :LOOPY STZ WORK :LOOPW LDA #DUMMY STA DATA,X :WAIT4 BIT CTRL,X BPL :WAIT4 LDA DATA,X STA ($44) INC $44 BNE :INW INC $45 ; inc msb on page boundary :INW INC WORK BNE :LOOPW DEY BNE :LOOPY PLY JSR GETR3 ; read 2 bytes crc LDA #SSNONE STA SS,X ; disable /CS CLC ; no error LDA #$00 PLY ; restore Y RTS :ERROR LDA #SSNONE STA SS,X ; disable /CS SEC ; an error occured LDA #$27 PLY ; restore Y 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 - Bad block number * $28 - No card inserted * ******************************** * TODO: check for card detect and write protect! WRITE JSR BLOCK ; calc block address LDA #SS0 ; enable /CS STA SS,X LDA #$58 ; send CMD24 JSR COMMAND ; send command PHY LDY #2 ; send data to card :LOOPY STZ WORK :LOOPW LDA ($44) STA DATA,X :WAIT4 BIT CTRL,X BPL :WAIT4 INC $44 BNE :INW INC $45 ; inc msb on page boundary :INW INC WORK BNE :LOOPW DEY BNE :LOOPY LDY #2 ; send 2 dummy crc bytes :CRC STA DATA,X :WAIT5 BIT CTRL,X BPL :WAIT5 DEY BNE :CRC PLY LDA #SSNONE ; disable /CS STA SS,X CLC ; no error LDA #0 PLY 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