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- ( 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 ROT ( a2 h l crc )
- _s+crc _s+crc ( a2 crc )
- SWAP 256 /MOD ROT ( h l crc )
- _s+crc _s+crc ( crc )
- 0x01 OR ( ensure stop bit )
- _sdcSR DROP ( send CRC )
- _wait ( wait for a valid response... )
- ;
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