; -------------- CRC8, 51汇编 ---------------
;入口: R0=数据起始地址, B=数据长度
;出口: A
;资源: R1,R6,R7,C
crc:
mov r1,#0
dscrc8_2:
mov a,@r0
mov r6,a
mov r7,#8
dscrc8_1:
xrl a,r1 ;crc_vault
mov c,acc.0
mov a,r1 ;crc_vault
jnc dscrc8_0
xrl a,#18h
dscrc8_0:
rrc a
mov r1,a
mov a,r6
rr a
mov r6,a
djnz r7,dscrc8_1
inc r0
djnz b,dscrc8_2
mov a,r1
ret |
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