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65 lines
911 B
65 lines
911 B
#include "libmfcrc.h"
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#if CRCMODE == 0
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#define crc_byte crc_crc32_byte
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#define crc_table crc_crc32_table
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#define crc_table_asm _crc_crc32_table
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#else
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#error "invalid CRCMODE"
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#endif
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#if defined(SDCC)
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__reentrantb uint32_t crc_byte(uint32_t crc, uint8_t c) __reentrant __naked
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{
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crc;
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c;
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__asm;
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mov r4,a
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mov a,sp
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add a,#-2
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mov r0,a
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mov a,@r0
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xrl a,dpl
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rl a
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rl a
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mov r3,a
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anl a,#0xfc
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add a,#crc_table_asm
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mov dpl,a
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mov a,r3
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anl a,#0x03
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addc a,#(crc_table_asm >> 8)
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xch a,dph
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mov r2,a
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clr a
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movc a,@a+dptr
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xrl a,r2
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mov r2,a
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mov a,#2
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movc a,@a+dptr
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xrl a,r4
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mov r3,a
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mov a,#3
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movc a,@a+dptr
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mov r4,a
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mov a,#1
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movc a,@a+dptr
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xrl a,b
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mov dph,a
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mov dpl,r2
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mov b,r3
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mov a,r4
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ret
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__endasm;
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}
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#else
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__reentrantb uint32_t crc_byte(uint32_t crc, uint8_t c) __reentrant
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{
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return (crc >> 8) ^ crc_table[((uint8_t)crc ^ c) & (uint8_t)0xff];
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}
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#endif
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