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156 lines
2.0 KiB
156 lines
2.0 KiB
#include "ax8052.h"
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#include "libmfcrc.h"
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#if defined(SDCC)
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uint8_t crc8_ccitt_byte(uint8_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 r0,sp
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dec r0
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dec r0
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mov a,@r0
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xrl a,dpl
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mov r0,#8
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00000$: clr c
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rlc a
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jnc 00001$
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xrl a,#0x07
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00001$: djnz r0,00000$
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mov dpl,a
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ret
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__endasm;
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}
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uint8_t crc8_ccitt(const __generic uint8_t *buf, uint8_t len, uint8_t init) __reentrant __naked
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{
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buf;
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len;
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init;
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__asm;
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mov r0,sp
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dec r0
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dec r0
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mov a,@r0
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mov r2,a
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dec r0
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mov a,@r0
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mov r3,a
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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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;; data
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00000$: mov a,@r0
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inc r0
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xrl a,r3
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mov r4,#8
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00001$: clr c
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rlc a
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jnc 00002$
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xrl a,#0x07
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00002$: djnz r4,00001$
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mov r3,a
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djnz r2,00000$
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sjmp 00040$
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;; code
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00010$: clr a
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movc a,@a+dptr
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inc dptr
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xrl a,r3
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mov r4,#8
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00011$: clr c
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rlc a
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jnc 00012$
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xrl a,#0x07
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00012$: djnz r4,00011$
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mov r3,a
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djnz r2,00010$
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sjmp 00040$
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;; xdata
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00020$: movx a,@dptr
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inc dptr
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xrl a,r3
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mov r4,#8
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00021$: clr c
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rlc a
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jnc 00022$
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xrl a,#0x07
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00022$: djnz r4,00021$
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mov r3,a
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djnz r2,00020$
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sjmp 00040$
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;; pdata
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00030$: movx a,@r0
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inc r0
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xrl a,r3
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mov r4,#8
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00031$: clr c
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rlc a
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jnc 00032$
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xrl a,#0x07
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00032$: djnz r4,00031$
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mov r3,a
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djnz r2,00030$
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;sjmp 00040$
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00040$: mov dpl,r3
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ret
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__endasm;
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}
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#else
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#if defined __CX51__ || defined __C51__
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static uint8_t crc8_reduce(uint8_t idx)
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{
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#pragma asm
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mov a,r7
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mov r0,#8
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c8red0: clr c
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rlc a
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jnc c8red1
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xrl a,#0x07
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c8red1: djnz r0,c8red0
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mov r7,a
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#pragma endasm
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}
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#else
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static __reentrantb uint8_t crc8_reduce(uint8_t idx) __reentrant
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{
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uint8_t cnt = 8;
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do {
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uint8_t m = idx & 0x80;
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idx <<= 1;
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if (m)
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idx ^= 0x07;
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} while (--cnt);
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return idx;
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}
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#endif
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__reentrantb uint8_t crc8_ccitt_byte(uint8_t crc, uint8_t c) __reentrant
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{
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return crc8_reduce(crc ^ c);
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}
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__reentrantb uint8_t crc8_ccitt(const uint8_t __generic *buf, uint8_t len, uint8_t init) __reentrant
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{
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do {
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init = crc8_reduce(init ^ *buf++);
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} while (len--);
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return init;
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}
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#endif
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