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inited flag in fpga

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Florian Reitz 2017-08-27 15:02:58 +02:00
parent 19632c05dc
commit 30f6b89f2b
3 changed files with 777 additions and 775 deletions
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AppleIISd.bin
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1420
AppleIISd.lst
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62
AppleIISd.s
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@ -37,15 +37,16 @@ R30 = $0478
R31 = $04F8
R32 = $0578
R33 = $05F8
INITED = $0678
* Constants
SSNONE = $0F
SS0 = $0E
DUMMY = $FF
FRXEN = $17
FRXDIS = $07
FRX = $10 ; CTRL register
ECE = $04
SS0 = $01 ; SS register
WP = $20
CARDDET = $40
INITED = $80
* signature bytes
@ -191,10 +192,10 @@ DRIVER CLD
TAX ; X holds now SLOT16
BIT $CFFF
LDY SLOT
LDA INITED,Y ; check for init
CMP #$01
BCC :INIT
LDA #INITED ; check for init
BIT SS,X
BEQ :INIT
:CMD LDA $42 ; get command
CMP #$00
BEQ :STATUS
@ -240,7 +241,8 @@ DRIVER CLD
INIT CLD
LDA #$03 ; set SPI mode 3
STA CTRL,X
LDA #SSNONE
LDA SS,X
ORA #SS0 ; set CS high
STA SS,X
LDA #7
STA DIV,X
@ -252,7 +254,8 @@ INIT CLD
BPL :WAIT
DEY
BNE :LOOP ; do 10 times
LDA #SS0 ; set CS low
LDA SS,X
AND #$FF!SS0 ; set CS low
STA SS,X
LDA #<CMD0 ; send CMD0
@ -336,8 +339,12 @@ INIT CLD
BNE :IOERROR ; error!
:END LDY SLOT
LDA #$01
STA INITED,Y ; initialized
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
@ -346,10 +353,9 @@ INIT CLD
BCS :END1
:IOERROR SEC
LDY #$27 ; init error
:END1 LDA #SSNONE ; deselect card
:END1 LDA SS,X ; set CS high
ORA #SS0
STA SS,X
LDA #7 ; enable 7MHz
STA CTRL,X
LDA #0 ; set div to 2
STA DIV,X
TYA ; retval in A
@ -535,7 +541,8 @@ STATUS CLC ; no error
READ JSR BLOCK ; calc block address
LDA #SS0 ; enable /CS
LDA SS,X ; enable /CS
AND #$FF!SS0
STA SS,X
LDA #$51 ; send CMD17
JSR COMMAND ; send command
@ -550,7 +557,8 @@ READ JSR BLOCK ; calc block address
BNE :GETTOK ; wait for $FE
LDY #2 ; read data from card
LDA #FRXEN ; enable FRX
LDA CTRL,X ; enable FRX
ORA #FRX
STA CTRL,X
LDA #DUMMY
STA DATA,X
@ -565,19 +573,22 @@ READ JSR BLOCK ; calc block address
DEY
BNE :LOOPY
LDA #FRXDIS ; disable FRX
LDA CTRL,X ; disable FRX
AND #$FF!FRX
STA CTRL,X
:CRC LDA #DUMMY ; first crc byte has
STA DATA,X ; already been read
LDA #SSNONE
LDA SS,X
ORA #SS0
STA SS,X ; disable /CS
CLC ; no error
LDA #$00
RTS
:ERROR LDA #SSNONE
:ERROR LDA SS,X
ORA #SS0
STA SS,X ; disable /CS
SEC ; an error occured
LDA #$27
@ -604,7 +615,8 @@ READ JSR BLOCK ; calc block address
WRITE JSR BLOCK ; calc block address
LDA #SS0 ; enable /CS
LDA SS,X ; enable /CS
AND #$FF!SS0
STA SS,X
LDA #$58 ; send CMD24
JSR COMMAND ; send command
@ -644,7 +656,8 @@ WRITE JSR BLOCK ; calc block address
CMP #$00
BEQ :WAIT6
LDA #SSNONE ; disable /CS
LDA SS,X ; disable /CS
ORA #SS0
STA SS,X
CLC ; no error
LDA #0
@ -656,7 +669,8 @@ WRITE JSR BLOCK ; calc block address
CMP #$00
BEQ :ERROR
LDA #SSNONE
LDA SS,X
ORA #SS0
STA SS,X ; disable /CS
SEC ; an error occured
LDA #$27