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collapseos
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  1. ( cmd arg1 arg2 -- resp )

  2. ( Sends a command to the SD card, along with arguments and

  3.   specified CRC fields. (CRC is only needed in initial commands

  4.   though). This does *not* handle CS. You have to

  5.   select/deselect the card outside this routine. )

  6. : _cmd

  7.     _wait DROP ROT    ( a1 a2 cmd )

  8.     0 _s+crc          ( a1 a2 crc )

  9.     ROT 256 /MOD ROT  ( a2 h l crc )

  10.     _s+crc _s+crc     ( a2 crc )

  11.     SWAP 256 /MOD ROT ( h l crc )

  12.     _s+crc _s+crc     ( crc )

  13.     0x01 OR           ( ensure stop bit )

  14.     _sdcSR DROP       ( send CRC )

  15.     _wait  ( wait for a valid response... )

  16. ;