diff --git a/drv/sdc.fs b/drv/sdc.fs deleted file mode 100644 index b904342..0000000 --- a/drv/sdc.fs +++ /dev/null @@ -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! -; diff --git a/recipes/rc2014/sdcard/README.md b/recipes/rc2014/sdcard/README.md index 5af5431..6178c05 100644 --- a/recipes/rc2014/sdcard/README.md +++ b/recipes/rc2014/sdcard/README.md @@ -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`.