Mercurial > hg > Members > kono > nitros9-code
view level1/modules/dwcheck.asm @ 2705:79d307ddf47f lwtools-port
wrapped around IFNDEF
| author | Boisy Pitre <boisy.pitre@nuance.com> |
|---|---|
| date | Fri, 20 Jul 2012 16:14:05 -0500 |
| parents | 660cc987e18d |
| children |
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IFNE 1 * Checksum routine - D returns as the sum of all bytes of the sector * Entry: X = address of sector * Exit : D = checksum value DoCSum equ * clr ,-s clra clrb c2@ addb ,x+ adca #0 dec ,s bne c2@ leas 1,s * exg a,b do endian conversion to match Server's checksum rts * Weak but fast CRC Computation Routine * Entry: X = address of sector * Exit : D = crc value *DoCRC equ * * IFNE H6309 * clrd * clre *CRC2 eord ,x++ * ince * bpl CRC2 * ELSE * clr ,-s * clra * clrb *CRC2 eora ,x+ * eorb ,x+ * inc ,s * bpl CRC2 * leas 1,s * ENDC * exg a,b do endian conversion to match PC's CRC * rts ELSE * CCITT CRC-16 Computation Routine * * Provided by Tim Lindner - 02/12/2003 * * Entry: X = address of sector * Exit : D = crc value *CRC16 equ * * IFNE H6309 * clrd * clre * ELSE * clra * clrb * pshs b save as counter of 256 bytes * ENDC *CRCLP eora ,x+ * IFNE H6309 * lsld * ELSE * lslb * rola * ENDC * bcc CRCLp0 * IFNE H6309 * eord #$1021 * ELSE * eora #$10 * eorb #$21 * ENDC *CRCLp0 equ * * IFNE H6309 * lsld * ELSE * lslb * rola * ENDC * bcc CRCLp1 * IFNE H6309 * eord #$1021 * ELSE * eora #$10 * eorb #$21 * ENDC *CRCLp1 equ * * IFNE H6309 * lsld * ELSE * lslb * rola * ENDC * bcc CRCLp2 * IFNE H6309 * eord #$1021 * ELSE * eora #$10 * eorb #$21 * ENDC *CRCLp2 equ * * IFNE H6309 * lsld * ELSE * lslb * rola * ENDC * bcc CRCLp3 * IFNE H6309 * eord #$1021 * ELSE * eora #$10 * eorb #$21 * ENDC *CRCLp3 equ * * IFNE H6309 * lsld * ELSE * lslb * rola * ENDC * bcc CRCLp4 ** IFNE H6309 ** eord #$1021 * ELSE * eora #$10 * eorb #$21 * ENDC *CRCLp4 equ * * IFNE H6309 * lsld * ELSE * lslb * rola * ENDC * bcc CRCLp5 * IFNE H6309 * eord #$1021 * ELSE * eora #$10 * eorb #$21 * ENDC *CRCLp5 equ * * IFNE H6309 * lsld * ELSE * lslb * rola * ENDC * bcc CRCLp6 * IFNE H6309 * eord #$1021 * ELSE * eora #$10 * eorb #$21 * ENDC *CRCLp6 equ * * IFNE H6309 * lsld * ELSE * lslb * rola * ENDC * bcc CRCLp7 * IFNE H6309 * eord #$1021 * ELSE * eora #$10 * eorb #$21 * ENDC *CRCLp7 equ * * IFNE H6309 * dece * ELSE * dec ,s * ENDC * bne CRCLp * IFEQ H6309 * leas 1,s eat counter on stack * ENDC * rts * * ENDC * * calculate CCITT CRC 16 * input: X - Address of block * Block is assumed to be 256 bytes * output: D - 16 bit CRC * uses: X, D, CC, and two bytes of stack DoCRC equ * IFNE H6309 clre clrd nextbyte ldf #8 eora ,x+ nextbit lsld bcc loop eord #$1021 loop decf bne nextbit dece bne nextbyte rts ELSE clra clrb pshs y,b nextbyte ldy #8 eora ,x+ nextbit lslb rola bcc loop eora #$10 eorb #$21 loop leay -1,y bne nextbit dec ,s bne nextbyte leas 1,s puls y,pc ENDC ENDC