URL
https://opencores.org/ocsvn/System09/System09/trunk
Subversion Repositories System09
[/] [System09/] [trunk/] [src/] [Flex9/] [f9-dkcf8.asm] - Rev 159
Go to most recent revision | Compare with Previous | Blame | View Log
*
** FLEX 9 COMPACT FLASH DISK DRIVERS
*
* FOR SYS09BUG 1.2 ON THE BURCHED B5-X300
* WITH I/O MAPPED AT $XE000
* AND ROM MAPPED AT $XF000
* THE BURCHED B5-X300 HAS 256KBYTES OF SRAM
* THE FIRST 64K IS USED BY FLEX,
* THE SECOND 192K MAY BE USED AS A RAM DISK
*
*
IMASK EQU $10 IRQ MASK CC
FMASK EQU $40 FIRQ MASK CC
DATREG EQU $FFF0 DAT REGISTERS
*
CF_BASE EQU $E040
CF_DATA EQU CF_BASE+0
CF_ERROR EQU CF_BASE+1 ; read error
CF_FEATURE EQU CF_BASE+1 ; write feature
CF_SECCNT EQU CF_BASE+2
CF_SECNUM EQU CF_BASE+3
CF_CYLLO EQU CF_BASE+4
CF_CYLHI EQU CF_BASE+5
CF_HEAD EQU CF_BASE+6
CF_STATUS EQU CF_BASE+7 ; read status
CF_COMAND EQU CF_BASE+7 ; write command
*
* Command Equates
*
CMDREAD EQU $20 ; Read Single sector
CMDWRITE EQU $30 ; Write Single sector
CMDFEATURE EQU $EF
FEAT8BIT EQU $01 ; enable 8 bit transfers
HEADLBA EQU $E0
*
* Status bit equates
*
BSY EQU $80
DRDY EQU $40
DRQ EQU $08
ERR EQU $01
ORG $DE00
*
* DISK DRIVER JUMP TABLE
*
READ JMP READSC
WRITE JMP WRITSC
VERIFY JMP BUSY
RESTOR JMP RESTR1
DRIVE JMP DRVSEL
DRVRDY JMP CHKDRV
QUICK JMP CHKDRV
COLDDR JMP INITDR
WARMDR JMP WARMD1
SEEK JMP SEEKTS
*
* RAM SPACE
*
DRVNUM FCB 0
*
*
* INITIALIZE CF CARD FOR 8 BIT LBA MODE
*
INITDR BSR WAITRDY
LDA #HEADLBA
STA CF_HEAD
LDA #FEAT8BIT
STA CF_FEATURE
LDA #CMDFEATURE
STA CF_COMAND
BRA WAITRDY
*
* RESTORE DISK DRIVER (SEEK TRACK 00)
*
RESTR1 BSR DRVSEL
CLRA ; Track 0
LDB #$01 ; Sector 1
*
* Seek track and sector
* A holds track number (0 - ??)
* B holds sector number (1 - ??)
* Sector numbers starts from 1
* subtract 1 to start from sector 0 on CF
*
SEEKTS DECB
STB CF_SECNUM
STA CF_CYLLO
LDB DRVNUM
STB CF_CYLHI
LDB #$01
STB CF_SECCNT
CLRB
WARMD1 RTS
*
* READ SECTORS FROM CF
*
*
READSC BSR SEEKTS
LDA #CMDREAD ; IDE READ MULTIPLE
STA CF_COMAND
BSR WAITRDY
*
* READ LOOP
*
CLRB
RDLP1 BSR WAITDRQ
LDA CF_DATA
STA ,X+
DECB
BNE RDLP1
*
CLRB
RDLP2 BSR WAITDRQ
LDA CF_DATA
DECB
BNE RDLP2
*
BSR WAITRDY
CLRB
RTS
*
* WRITE SECTOR TO CF
*
WRITSC BSR SEEKTS ; SEEK TRACK & SECTOR
LDA #CMDWRITE; IDE WRITE MULTIPLE
STA CF_COMAND
BSR WAITRDY
*
* WRITE LOOP
*
CLRB
WRTLP1 BSR WAITDRQ
LDA ,X+
STA CF_DATA
DECB
BNE WRTLP1
*
CLRB
WRTLP2 BSR WAITDRQ
CLRA
STA CF_DATA
DECB
BNE WRTLP2
*
BSR WAITRDY
CLRB
RTS
*
* CHECK FOR BUSY
* Doubles as VERIFY
*
BUSY CLRB Never busy
RTS
*
* DRIVE SELECT DISK DRIVER
*
DRVSEL LDA 3,X GET DRIVE # FROM FCB
CMPA #3
BLS DRVS2 IF > 3, SET IT TO 0
CLRA
DRVS2 STA DRVNUM
CLRB ; SET Z, CLEAR C
RTS
*
* CHECK DRIVE READY DISK DRIVER
*
CHKDRV LDA 3,X
CLRB ; CLEAR C, SET Z
RTS
*
* WAIT UNTIL READY
*
WAITRDY LDA CF_STATUS
BITA #BSY
BNE WAITRDY
LDA CF_STATUS
BITA #DRDY
BEQ WAITRDY
RTS
*
* WAIT FOR DATA REQUEST
*
WAITDRQ LDA CF_STATUS
BITA #DRQ
BEQ WAITDRQ
RTS
*
END
Go to most recent revision | Compare with Previous | Blame | View Log