collapseos/blk/377

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2020-04-23 13:55:00 -04:00
( 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 ;