CODE _sdcSel SDC_CSLOW OUTnA, ;CODE
CODE _sdcDesel SDC_CSHIGH OUTnA, ;CODE
( Computes n into crc c with polynomial 0x1021 )
CODE _crc16 ( c n -- c )
HL POPqq, ( n ) DE POPqq, ( c )
A L LDrr, D XORr, D A LDrr,
B 8 LDrn,
BEGIN,
E SLAr, D RLr,
IFC, ( msb is set, apply polynomial )
A D LDrr, 0x10 XORn, D A LDrr,
A E LDrr, 0x21 XORn, E A LDrr,
THEN,
DJNZ, AGAIN,
DE PUSHqq,
;CODE
