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124da6adec
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.
17 lines
493 B
Plaintext
17 lines
493 B
Plaintext
: _sdc! ( srcaddr blkno -- )
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(spie) 0x58 ( CMD24 ) 0 ROT ( a cmd 0 blkno ) _cmd
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IF _err THEN
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_idle DROP 0xfe (spix) DROP
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0 SWAP ( crc a )
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512 0 DO ( crc a )
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C@+ ( crc a+1 n )
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ROT OVER ( a n crc n )
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_crc16 ( a n crc )
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SWAP ( a crc n )
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(spix) DROP ( a crc )
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SWAP ( crc a )
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LOOP
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DROP ( crc ) 256 /MOD ( lsb msb )
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(spix) DROP (spix) DROP
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_wait DROP (spid) ;
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