collapseos/blk/432
Virgil Dupras 124da6adec Move SD Card subsystem outside of RC2014 recipe and add protocols
Although the SPI Relay driver is RC2014-specific, the SD Card driver
is generic enough to be a subsystem. That's the second subsystem we
add and this warrants, I think, the formalization of a new concept:
protocols.
2020-08-16 14:30:33 -04:00

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: _sdc@ ( dstaddr blkno -- )
(spie) 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 _idle ( crc a a n )
DUP ROT C! ( crc a n )
ROT SWAP _crc16 ( a crc )
SWAP 1+ ( crc a+1 )
LOOP
DROP ( crc1 )
_idle 8 LSHIFT _idle + ( crc2 )
_wait DROP (spid)
= NOT IF _err THEN ;