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112 lines
1.7 KiB
112 lines
1.7 KiB
#include "libmfcrc.h"
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#define crc_buf crc_crc8onewire_msb
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#define crc_byte crc_crc8onewire_msb_byte
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#define crc_table_asm _crc_crc8onewire_msbtable
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#define CRCMSB 1
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#if defined(SDCC)
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__reentrantb uint8_t crc_buf(const uint8_t __generic *buf, uint16_t buflen, uint8_t crc) __reentrant __naked
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{
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buf;
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buflen;
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crc;
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__asm;
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mov a,sp
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add a,#-4
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mov r0,a
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mov a,@r0
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mov r4,a
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inc r0
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mov a,@r0
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mov r2,a
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inc r0
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mov a,@r0
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mov r3,a
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orl a,r2
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jz 00001$
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mov a,r2
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jz 00000$
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inc r3
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00000$: jb _B_7,00010$ ; >0x80 code
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jnb _B_6,00020$ ; <0x40 far
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mov r0,dpl
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jb _B_5,00030$ ; >0x60 pdata
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;; idata
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00040$: mov a,@r0
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inc r0
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;; lsb/msb: crc = crc_table[crc ^ c]
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xrl a,r4
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mov dptr,#crc_table_asm
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movc a,@a+dptr
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mov r4,a
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;; loop
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djnz r2,00040$
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djnz r3,00040$
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sjmp 00001$
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00030$: movx a,@r0
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inc r0
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;; lsb/msb: crc = crc_table[crc ^ c]
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xrl a,r4
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mov dptr,#crc_table_asm
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movc a,@a+dptr
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mov r4,a
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;; loop
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djnz r2,00030$
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djnz r3,00030$
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00001$:
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mov dpl,r4
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ret
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00020$: movx a,@dptr
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inc dptr
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mov r0,dpl
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mov r1,dph
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;; lsb/msb: crc = crc_table[crc ^ c]
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xrl a,r4
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mov dptr,#crc_table_asm
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movc a,@a+dptr
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mov r4,a
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;; loop
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mov dph,r1
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mov dpl,r0
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djnz r2,00020$
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djnz r3,00020$
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sjmp 00001$
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00010$: clr a
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movc a,@a+dptr
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inc dptr
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mov r0,dpl
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mov r1,dph
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;; lsb/msb: crc = crc_table[crc ^ c]
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xrl a,r4
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mov dptr,#crc_table_asm
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movc a,@a+dptr
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mov r4,a
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;; loop
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mov dph,r1
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mov dpl,r0
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djnz r2,00010$
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djnz r3,00010$
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sjmp 00001$
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__endasm;
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}
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#else
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__reentrantb uint8_t crc_buf(const uint8_t __generic *buf, uint16_t buflen, uint8_t crc) __reentrant
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{
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if (!buflen)
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return crc;
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do {
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crc = crc_byte(crc, *buf++);
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} while (--buflen);
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return crc;
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}
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#endif
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