mirror of
https://github.com/hsoft/collapseos.git
synced 2024-12-28 08:48:05 +11:00
recipes/rc2014/sdcard: use driver from blkfs
This completes the migration of all Collapse OS code into blkfs!
This commit is contained in:
Virgil Dupras
parent
865f4f9256
commit
f690cb2e5b
215
drv/sdc.fs
215
drv/sdc.fs
@ -1,215 +0,0 @@
|
||||
( -- n )
|
||||
: _idle 0xff _sdcSR ;
|
||||
|
||||
( -- n )
|
||||
( _sdcSR 0xff until the response is something else than 0xff
|
||||
for a maximum of 20 times. Returns 0xff if no response. )
|
||||
: _wait
|
||||
0 ( cnt )
|
||||
BEGIN
|
||||
_idle
|
||||
DUP 0xff = IF DROP ELSE SWAP DROP EXIT THEN
|
||||
1+
|
||||
DUP 20 = UNTIL
|
||||
DROP 0xff
|
||||
;
|
||||
|
||||
( -- )
|
||||
( The opposite of sdcWaitResp: we wait until response is 0xff.
|
||||
After a successful read or write operation, the card will be
|
||||
busy for a while. We need to give it time before interacting
|
||||
with it again. Technically, we could continue processing on
|
||||
our side while the card it busy, and maybe we will one day,
|
||||
but at the moment, I'm having random write errors if I don't
|
||||
do this right after a write, so I prefer to stay cautious
|
||||
for now. )
|
||||
: _ready BEGIN _idle 0xff = UNTIL ;
|
||||
|
||||
( c n -- c )
|
||||
( Computes n into crc c with polynomial 0x09
|
||||
Note that the result is "left aligned", that is, that 8th
|
||||
bit to the "right" is insignificant (will be stop bit). )
|
||||
: _crc7
|
||||
XOR ( c )
|
||||
8 0 DO
|
||||
2 * ( <<1 )
|
||||
DUP 255 > IF
|
||||
( MSB was set, apply polynomial )
|
||||
0xff AND
|
||||
0x12 XOR ( 0x09 << 1, we apply CRC on high bits )
|
||||
THEN
|
||||
LOOP
|
||||
;
|
||||
|
||||
( c n -- c )
|
||||
( Computes n into crc c with polynomial 0x1021 )
|
||||
: _crc16
|
||||
SWAP DUP 256 / ( n c c>>8 )
|
||||
ROT XOR ( c x )
|
||||
DUP 16 / XOR ( c x^x>>4 )
|
||||
SWAP 256 * ( x c<<8 )
|
||||
OVER 4096 * XOR ( x c^x<<12 )
|
||||
OVER 32 * XOR ( x c^x<<5 )
|
||||
XOR ( c )
|
||||
;
|
||||
|
||||
( send-and-crc7 )
|
||||
( n c -- c )
|
||||
: _s+crc SWAP DUP _sdcSR DROP _crc7 ;
|
||||
|
||||
( cmd arg1 arg2 -- resp )
|
||||
( Sends a command to the SD card, along with arguments and
|
||||
specified CRC fields. (CRC is only needed in initial commands
|
||||
though).
|
||||
This does *not* handle CS. You have to select/deselect the
|
||||
card outside this routine. )
|
||||
: _cmd
|
||||
_wait DROP
|
||||
ROT ( a1 a2 cmd )
|
||||
0 _s+crc ( a1 a2 crc )
|
||||
ROT 256 /MOD ( a2 crc h l )
|
||||
ROT ( a2 h l crc )
|
||||
_s+crc ( a2 h crc )
|
||||
_s+crc ( a2 crc )
|
||||
SWAP 256 /MOD ( crc h l )
|
||||
ROT ( h l crc )
|
||||
_s+crc ( h crc )
|
||||
_s+crc ( crc )
|
||||
( send CRC )
|
||||
0x01 OR ( ensure stop bit )
|
||||
_sdcSR DROP
|
||||
( And now we just have to wait for a valid response... )
|
||||
_wait
|
||||
;
|
||||
|
||||
( cmd arg1 arg2 -- r )
|
||||
( Send a command that expects a R1 response, handling CS. )
|
||||
: SDCMDR1 _sdcSel _cmd _sdcDesel ;
|
||||
|
||||
( cmd arg1 arg2 -- r arg1 arg2 )
|
||||
( Send a command that expects a R7 response, handling CS. A R7
|
||||
is a R1 followed by 4 bytes. arg1 contains bytes 0:1, arg2
|
||||
has 2:3 )
|
||||
: SDCMDR7
|
||||
_sdcSel
|
||||
_cmd ( r )
|
||||
_idle 256 * ( r h )
|
||||
_idle + ( r arg1 )
|
||||
_idle 256 * ( r arg1 h )
|
||||
_idle + ( r arg1 arg2 )
|
||||
_sdcDesel
|
||||
;
|
||||
|
||||
: _err _sdcDesel ABORT" SDerr" ;
|
||||
|
||||
( Initialize a SD card. This should be called at least 1ms
|
||||
after the powering up of the card. )
|
||||
: SDC$
|
||||
( Wake the SD card up. After power up, a SD card has to
|
||||
receive at least 74 dummy clocks with CS and DI high. We
|
||||
send 80. )
|
||||
10 0 DO _idle DROP LOOP
|
||||
|
||||
( call cmd0 and expect a 0x01 response (card idle)
|
||||
this should be called multiple times. we're actually
|
||||
expected to. let's call this for a maximum of 10 times. )
|
||||
0 ( dummy )
|
||||
10 0 DO ( r )
|
||||
DROP
|
||||
0b01000000 0 0 ( CMD0 )
|
||||
SDCMDR1
|
||||
DUP 0x01 = IF LEAVE THEN
|
||||
LOOP
|
||||
0x01 = NOT IF _err THEN
|
||||
|
||||
( Then comes the CMD8. We send it with a 0x01aa argument
|
||||
and expect a 0x01aa argument back, along with a 0x01 R1
|
||||
response. )
|
||||
0b01001000 0 0x1aa ( CMD8 )
|
||||
SDCMDR7 ( r arg1 arg2 )
|
||||
0x1aa = NOT IF _err THEN ( arg2 check )
|
||||
0 = NOT IF _err THEN ( arg1 check )
|
||||
0x01 = NOT IF _err THEN ( r check )
|
||||
|
||||
( Now we need to repeatedly run CMD55+CMD41 (0x40000000)
|
||||
until the card goes out of idle mode, that is, when
|
||||
it stops sending us 0x01 response and send us 0x00
|
||||
instead. Any other response means that initialization
|
||||
failed. )
|
||||
BEGIN
|
||||
0b01110111 0 0 ( CMD55 )
|
||||
SDCMDR1
|
||||
0x01 = NOT IF _err THEN
|
||||
0b01101001 0x4000 0x0000 ( CMD41 )
|
||||
SDCMDR1
|
||||
DUP 0x01 > IF _err THEN
|
||||
NOT UNTIL
|
||||
( Out of idle mode! Success! )
|
||||
;
|
||||
|
||||
( dstaddr blkno -- )
|
||||
: _sdc@
|
||||
_sdcSel
|
||||
0x51 ( CMD17 )
|
||||
0 ROT ( a cmd 0 blkno )
|
||||
_cmd
|
||||
IF _err THEN
|
||||
_wait
|
||||
0xfe = NOT IF _err THEN
|
||||
0 SWAP ( crc a )
|
||||
512 0 DO ( crc a )
|
||||
DUP ( crc a a )
|
||||
_idle ( crc a a n )
|
||||
DUP ROT ( crc a n n a )
|
||||
C! ( crc a n )
|
||||
ROT SWAP ( a crc n )
|
||||
_crc16 ( a crc )
|
||||
SWAP 1+ ( crc a+1 )
|
||||
LOOP
|
||||
DROP ( crc1 )
|
||||
_idle 256 *
|
||||
_idle + ( crc2 )
|
||||
_wait DROP
|
||||
_sdcDesel
|
||||
= NOT IF _err THEN
|
||||
;
|
||||
|
||||
: SDC@
|
||||
2 * DUP BLK( SWAP ( b a b )
|
||||
_sdc@
|
||||
1+ BLK( 512 + SWAP
|
||||
_sdc@
|
||||
;
|
||||
|
||||
( srcaddr blkno -- )
|
||||
: _sdc!
|
||||
_sdcSel
|
||||
0x58 ( CMD24 )
|
||||
0 ROT ( a cmd 0 blkno )
|
||||
_cmd
|
||||
IF _err THEN
|
||||
_idle DROP
|
||||
0xfe _sdcSR DROP
|
||||
0 SWAP ( crc a )
|
||||
512 0 DO ( crc a )
|
||||
C@+ ( crc a+1 n )
|
||||
ROT OVER ( a n crc n )
|
||||
_crc16 ( a n crc )
|
||||
SWAP ( a crc n )
|
||||
_sdcSR DROP ( a crc )
|
||||
SWAP ( crc a )
|
||||
LOOP
|
||||
DROP ( crc )
|
||||
256 /MOD ( lsb msb )
|
||||
_sdcSR DROP ( lsb )
|
||||
_sdcSR DROP
|
||||
_wait DROP
|
||||
_sdcDesel
|
||||
;
|
||||
|
||||
: SDC!
|
||||
2 * DUP BLK( SWAP ( b a b )
|
||||
_sdc!
|
||||
1+ BLK( 512 + SWAP
|
||||
_sdc!
|
||||
;
|
||||
@ -19,7 +19,7 @@ design.
|
||||
## Gathering parts
|
||||
|
||||
* A RC2014 Classic
|
||||
* `stage3.bin` from the base recipe
|
||||
* `stage2.bin` from the base recipe
|
||||
* A MicroSD breakout board. I use Adafruit's.
|
||||
* A proto board + header pins with 39 positions so we can make a RC2014 card.
|
||||
* Diodes, resistors and stuff
|
||||
@ -69,20 +69,20 @@ matter. However, it *does* matter for the `SELECT` line, so I don't follow my
|
||||
own schematic with regards to the `M1` and `A2` lines and use two inverters
|
||||
instead.
|
||||
|
||||
## Building your stage 4
|
||||
## Building your stage 3
|
||||
|
||||
Using the same technique as you used for building your stage 3, you can append
|
||||
required words to your boot binary. Required units are `forth/blk.fs` and
|
||||
`drv/sdc.fs`. You also need `drv/sdc.z80` but to save you the troubles of
|
||||
rebuilding from stage 1 for this recipe, we took the liberty of already having
|
||||
included it in the base recipe.
|
||||
Using the same technique as you used in the `eeprom` recipe, you can append
|
||||
required words to your boot binary. Required units `blk` (B464) and the SD Card
|
||||
driver (B370). You only need the Forth part. You of course actually need
|
||||
Z80 SDC words but to save you the troubles of rebuilding from stage 1 for this
|
||||
recipe, we took the liberty of already having included it in the base recipe.
|
||||
|
||||
## Testing in the emulator
|
||||
|
||||
The RC2014 emulator includes SDC emulation. You can attach a SD card image to
|
||||
it by invoking it with a second argument:
|
||||
|
||||
../../../emul/hw/rc2014/classic stage4.bin ../../../emul/blkfs
|
||||
../../../emul/hw/rc2014/classic stage3.bin ../../../emul/blkfs
|
||||
|
||||
You will then run with a SD card having the contents from `/blk`.
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user