mirror of
https://github.com/hsoft/collapseos.git
synced 2024-09-29 09:20:55 +10:00
sdc: add sdcPutC
Wriiiiiite!
This commit is contained in:
Virgil Dupras
parent
3bc7cec03a
commit
5e5c7e6592
160
kernel/sdc.asm
160
kernel/sdc.asm
@ -35,7 +35,6 @@
|
||||
; sector.
|
||||
.equ SDC_BUFSEC SDC_BUF+SDC_BLKSIZE
|
||||
; Whether the buffer has been written to. 0 means clean. 1 means dirty.
|
||||
; (not used yet)
|
||||
.equ SDC_BUFDIRTY SDC_BUFSEC+1
|
||||
.equ SDC_RAMEND SDC_BUFDIRTY+1
|
||||
|
||||
@ -314,32 +313,119 @@ sdcReadBlk:
|
||||
pop bc
|
||||
ret
|
||||
|
||||
; *** shell cmds ***
|
||||
; Write the contents of (SDC_BUF) in sector number (SDC_BUFSEC). Unsets the
|
||||
; (SDC_BUFDIRTY) flag on success.
|
||||
; A returns 0 in A on success (with Z set), non-zero (with Z unset) on error.
|
||||
sdcWriteBlk:
|
||||
ld a, (SDC_BUFDIRTY)
|
||||
or a ; cp 0
|
||||
ret z ; return success, but do nothing.
|
||||
|
||||
sdcInitializeCmd:
|
||||
.db "sdci", 0, 0, 0
|
||||
call sdcInitialize
|
||||
jp sdcSetBlkSize ; return
|
||||
push bc
|
||||
push hl
|
||||
|
||||
; *** blkdev routines ***
|
||||
out (SDC_PORT_CSLOW), a
|
||||
ld a, (SDC_BUFSEC)
|
||||
ld hl, 0 ; write single block at addr A
|
||||
ld d, 0
|
||||
ld e, a
|
||||
ld a, 0b01011000 ; CMD24
|
||||
call sdcCmd
|
||||
or a ; cp 0
|
||||
jr nz, .error
|
||||
|
||||
sdcGetC:
|
||||
; SDC_PTR points to the character we're supposed to read right now, but
|
||||
; we first have to check whether we need to load a new sector in memory.
|
||||
; To do this, we compare the high 7 bits of (SDC_PTR) with (SDC_BUFSEC).
|
||||
; If they're different, we need to load a new block.
|
||||
; Before sending the data packet, we need to send at least one empty
|
||||
; byte.
|
||||
ld a, 0xff
|
||||
call sdcSendRecv
|
||||
|
||||
; data packet token for CMD24
|
||||
ld a, 0xfe
|
||||
call sdcSendRecv
|
||||
|
||||
; Sending our data token!
|
||||
ld bc, SDC_BLKSIZE
|
||||
ld hl, SDC_BUF
|
||||
.loop:
|
||||
ld a, (hl)
|
||||
call sdcSendRecv
|
||||
cpi ; a trick to inc HL and dec BC at the same time.
|
||||
; P/V indicates whether BC reached 0
|
||||
jp pe, .loop ; BC is not zero, loop
|
||||
; Send our 2 CRC bytes. They can be anything
|
||||
call sdcIdle
|
||||
call sdcIdle
|
||||
; Let's see what response we have
|
||||
call sdcWaitResp
|
||||
and 0b00011111 ; We ignore the first 3 bits of the response.
|
||||
cp 0b00000101 ; A valid response is "010" in bits 3:1 flanked
|
||||
; by 0 on its left and 1 on its right.
|
||||
jr nz, .error
|
||||
; good! Now, we need to let the card process this data. It will return
|
||||
; 0xff when it's not busy any more.
|
||||
call sdcWaitResp
|
||||
xor a
|
||||
ld (SDC_BUFDIRTY), a
|
||||
jr .end
|
||||
.error:
|
||||
; try to preserve error code
|
||||
or a ; cp 0
|
||||
jr nz, .end ; already non-zero
|
||||
inc a ; zero, adjust
|
||||
.end:
|
||||
out (SDC_PORT_CSHIGH), a
|
||||
pop hl
|
||||
pop bc
|
||||
ret
|
||||
|
||||
; Ensures that (SDC_BUFSEC) is in sync with (SDC_PTR), that is, that the current
|
||||
; buffer in memory corresponds to where SDC_PTR points to. If it doesn't, loads
|
||||
; the sector that (SDC_PTR) points to in (SDC_BUF) and update (SDC_BUFSEC).
|
||||
; If the (SDC_BUFDIRTY) flag is set, we write the content of the in-memory
|
||||
; buffer to the SD card before we read a new sector.
|
||||
; Returns Z on success, not-Z on error (with the error code from either
|
||||
; sdcReadBlk or sdcWriteBlk)
|
||||
sdcSync:
|
||||
; SDC_PTR points to the character we're supposed to read or right now,
|
||||
; but we first have to check whether we need to load a new sector in
|
||||
; memory. To do this, we compare the high 7 bits of (SDC_PTR) with
|
||||
; (SDC_BUFSEC). If they're different, we need to load a new block.
|
||||
push hl
|
||||
ld a, (SDC_BUFSEC)
|
||||
ld h, a
|
||||
ld a, (SDC_PTR+1) ; high byte has bufsec in its high 7 bits
|
||||
srl a
|
||||
cp h
|
||||
jr z, .noload
|
||||
; not equal, we need to load a new sector. A already contains the
|
||||
; sector to load.
|
||||
call sdcReadBlk
|
||||
jr nz, .error
|
||||
.noload:
|
||||
pop hl
|
||||
ret z ; equal? nothing to do
|
||||
; We have to read a new sector, but first, let's write the current one
|
||||
; if needed.
|
||||
call sdcWriteBlk
|
||||
ret nz ; error
|
||||
; Let's read our new sector
|
||||
ld a, (SDC_PTR+1)
|
||||
srl a
|
||||
jp sdcReadBlk ; returns
|
||||
|
||||
|
||||
; *** shell cmds ***
|
||||
|
||||
sdcInitializeCmd:
|
||||
.db "sdci", 0, 0, 0
|
||||
call sdcInitialize
|
||||
jp sdcSetBlkSize ; returns
|
||||
|
||||
; Flush the current SDC buffer if dirty
|
||||
sdcFlushCmd:
|
||||
.db "sdcf", 0, 0, 0
|
||||
jp sdcWriteBlk ; returns
|
||||
|
||||
; *** blkdev routines ***
|
||||
|
||||
; Make HL point to (SDC_PTR) in current buffer
|
||||
_sdcPlaceBuf:
|
||||
call sdcSync
|
||||
ret nz ; error
|
||||
ld a, (SDC_PTR+1) ; high byte
|
||||
and 0x01 ; is first bit set?
|
||||
jr nz, .highbuf ; first bit set? we're in the "highbuf" zone.
|
||||
@ -355,7 +441,14 @@ sdcGetC:
|
||||
; all we need is to increase HL by the number in SDC_PTR's LSB (little
|
||||
; endian, remember).
|
||||
ld a, (SDC_PTR) ; LSB
|
||||
call addHL
|
||||
call addHL ; returns
|
||||
xor a ; ensure Z
|
||||
ret
|
||||
|
||||
sdcGetC:
|
||||
push hl
|
||||
call _sdcPlaceBuf
|
||||
jr nz, .error
|
||||
|
||||
; This is it!
|
||||
ld a, (hl)
|
||||
@ -367,13 +460,40 @@ sdcGetC:
|
||||
|
||||
cp a ; ensure Z
|
||||
jr .end
|
||||
|
||||
.error:
|
||||
call unsetZ
|
||||
.end:
|
||||
pop hl
|
||||
ret
|
||||
|
||||
sdcPutC:
|
||||
push hl
|
||||
push af ; let's remember the char we put, _sdcPlaceBuf
|
||||
; destroys A.
|
||||
call _sdcPlaceBuf
|
||||
jr nz, .error
|
||||
|
||||
; HL points to our dest. Recall A and write
|
||||
pop af
|
||||
ld (hl), a
|
||||
|
||||
|
||||
; we need to increase (SDC_PTR)
|
||||
ld hl, (SDC_PTR)
|
||||
inc hl
|
||||
ld (SDC_PTR), hl
|
||||
|
||||
ld a, 1
|
||||
ld (SDC_BUFDIRTY), a
|
||||
xor a ; ensure Z
|
||||
jr .end
|
||||
.error:
|
||||
pop af
|
||||
call unsetZ
|
||||
.end:
|
||||
pop hl
|
||||
ret
|
||||
|
||||
sdcSeek:
|
||||
ld (SDC_PTR), hl
|
||||
ret
|
||||
|
||||
@ -10,10 +10,11 @@ jp init ; 3 bytes
|
||||
|
||||
; *** Jump Table ***
|
||||
jp printstr
|
||||
jp fsOpen
|
||||
jp fsSeek
|
||||
jp fsTell
|
||||
jp fsGetC
|
||||
jp sdcWaitResp
|
||||
jp sdcCmd
|
||||
jp sdcCmdR1
|
||||
jp sdcCmdR7
|
||||
jp sdcSendRecv
|
||||
|
||||
; interrupt hook
|
||||
.fill 0x38-$
|
||||
@ -28,7 +29,7 @@ jp aciaInt
|
||||
#include "blockdev.asm"
|
||||
; List of devices
|
||||
.dw aciaGetC, aciaPutC, 0, 0
|
||||
.dw sdcGetC, 0, sdcSeek, sdcTell
|
||||
.dw sdcGetC, sdcPutC, sdcSeek, sdcTell
|
||||
.dw blk2GetC, blk2PutC, blk2Seek, blk2Tell
|
||||
|
||||
#include "blockdev_cmds.asm"
|
||||
@ -42,9 +43,9 @@ jp aciaInt
|
||||
#include "fs_cmds.asm"
|
||||
|
||||
.equ SHELL_RAMSTART FS_RAMEND
|
||||
.equ SHELL_EXTRA_CMD_COUNT 8
|
||||
.equ SHELL_EXTRA_CMD_COUNT 9
|
||||
#include "shell.asm"
|
||||
.dw sdcInitializeCmd, blkBselCmd, blkSeekCmd
|
||||
.dw sdcInitializeCmd, sdcFlushCmd, blkBselCmd, blkSeekCmd
|
||||
.dw fsOnCmd, flsCmd, fnewCmd, fdelCmd, fopnCmd
|
||||
|
||||
#include "pgm.asm"
|
||||
|
||||
Loading…
Reference in New Issue
Block a user