mirror of https://github.com/hsoft/collapseos.git
17 lines
450 B
Plaintext
17 lines
450 B
Plaintext
CODE _sdcSel SDC_CSLOW OUTnA, ;CODE
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CODE _sdcDesel SDC_CSHIGH OUTnA, ;CODE
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( Computes n into crc c with polynomial 0x1021 )
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CODE _crc16 ( c n -- c )
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HL POPqq, ( n ) DE POPqq, ( c )
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A L LDrr, D XORr, D A LDrr,
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B 8 LDrn,
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BEGIN,
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E SLAr, D RLr,
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IFC, ( msb is set, apply polynomial )
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A D LDrr, 0x10 XORn, D A LDrr,
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A E LDrr, 0x21 XORn, E A LDrr,
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THEN,
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DJNZ, AGAIN,
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DE PUSHqq,
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;CODE
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