tgs0910
   
|
分享:
▼
大大不好意思
在请教一下可不可以说的清楚一点
我比较喜欢用下面的程式:
; /* Table of CRC values for high-order byte */
auchCRCHi equ $
db 00h, C1h, 81h, 40h, 01h, C0h, 80h, 41h, 01h, C0h
db 80h, 41h, 00h, C1h, 81h, 40h, 01h, C0h, 80h, 41h
db 00h, C1h, 81h, 40h, 00h, C1h, 81h, 40h, 01h, C0h
db 80h, 41h, 01h, C0h, 80h, 41h, 00h, C1h, 81h, 40h
db 00h, C1h, 81h, 40h, 01h, C0h, 80h, 41h, 00h, C1h
db 81h, 40h, 01h, C0h, 80h, 41h, 01h, C0h, 80h, 41h
db 00h, C1h, 81h, 40h, 01h, C0h, 80h, 41h, 00h, C1h
db 81h, 40h, 00h, C1h, 81h, 40h, 01h, C0h, 80h, 41h
db 00h, C1h, 81h, 40h, 01h, C0h, 80h, 41h, 01h, C0h
db 80h, 41h, 00h, C1h, 81h, 40h, 00h, C1h, 81h, 40h
db 01h, C0h, 80h, 41h, 01h, C0h, 80h, 41h, 00h, C1h
db 81h, 40h, 01h, C0h, 80h, 41h, 00h, C1h, 81h, 40h
db 00h, C1h, 81h, 40h, 01h, C0h, 80h, 41h, 01h, C0h
db 80h, 41h, 00h, C1h, 81h, 40h, 00h, C1h, 81h, 40h
db 01h, C0h, 80h, 41h, 00h, C1h, 81h, 40h, 01h, C0h
db 80h, 41h, 01h, C0h, 80h, 41h, 00h, C1h, 81h, 40h
db 00h, C1h, 81h, 40h, 01h, C0h, 80h, 41h, 01h, C0h
db 80h, 41h, 00h, C1h, 81h, 40h, 01h, C0h, 80h, 41h
db 00h, C1h, 81h, 40h, 00h, C1h, 81h, 40h, 01h, C0h
db 80h, 41h, 00h, C1h, 81h, 40h, 01h, C0h, 80h, 41h
db 01h, C0h, 80h, 41h, 00h, C1h, 81h, 40h, 01h, C0h
db 80h, 41h, 00h, C1h, 81h, 40h, 00h, C1h, 81h, 40h
db 01h, C0h, 80h, 41h, 01h, C0h, 80h, 41h, 00h, C1h
db 81h, 40h, 00h, C1h, 81h, 40h, 01h, C0h, 80h, 41h
db 00h, C1h, 81h, 40h, 01h, C0h, 80h, 41h, 01h, C0h
db 80h, 41h, 00h, C1h, 81h, 40h
; /* Table of CRC values for low-order byte */
auchCRCLo equ $
db 00h, C0h, C1h, 01h, C3h, 03h, 02h, C2h, C6h, 06h
db 07h, C7h, 05h, C5h, C4h, 04h, CCh, 0Ch, 0Dh, CDh
db 0Fh, CFh, CEh, 0Eh, 0Ah, CAh, CBh, 0Bh, C9h, 09h
db 08h, C8h, D8h, 18h, 19h, D9h, 1Bh, DBh, DAh, 1Ah
db 1Eh, DEh, DFh, 1Fh, DDh, 1Dh, 1Ch, DCh, 14h, D4h
db D5h, 15h, D7h, 17h, 16h, D6h, D2h, 12h, 13h, D3h
db 11h, D1h, D0h, 10h, F0h, 30h, 31h, F1h, 33h, F3h
db F2h, 32h, 36h, F6h, F7h, 37h, F5h, 35h, 34h, F4h
db 3Ch, FCh, FDh, 3Dh, FFh, 3Fh, 3Eh, FEh, FAh, 3Ah
db 3Bh, FBh, 39h, F9h, F8h, 38h, 28h, E8h, E9h, 29h
db EBh, 2Bh, 2Ah, EAh, EEh, 2Eh, 2Fh, EFh, 2Dh, EDh
db ECh, 2Ch, E4h, 24h, 25h, E5h, 27h, E7h, E6h, 26h
db 22h, E2h, E3h, 23h, E1h, 21h, 20h, E0h, A0h, 60h
db 61h, A1h, 63h, A3h, A2h, 62h, 66h, A6h, A7h, 67h
db A5h, 65h, 64h, A4h, 6Ch, ACh, ADh, 6Dh, AFh, 6Fh
db 6Eh, AEh, AAh, 6Ah, 6Bh, ABh, 69h, A9h, A8h, 68h
db 78h, B8h, B9h, 79h, BBh, 7Bh, 7Ah, BAh, BEh, 7Eh
db 7Fh, BFh, 7Dh, BDh, BCh, 7Ch, B4h, 74h, 75h, B5h
db 77h, B7h, B6h, 76h, 72h, B2h, B3h, 73h, B1h, 71h
db 70h, B0h, 50h, 90h, 91h, 51h, 93h, 53h, 52h, 92h
db 96h, 56h, 57h, 97h, 55h, 95h, 94h, 54h, 9Ch, 5Ch
db 5Dh, 9Dh, 5Fh, 9Fh, 9Eh, 5Eh, 5Ah, 9Ah, 9Bh, 5Bh
db 99h, 59h, 58h, 98h, 88h, 48h, 49h, 89h, 4Bh, 8Bh
db 8Ah, 4Ah, 4Eh, 8Eh, 8Fh, 4Fh, 8Dh, 4Dh, 4Ch, 8Ch
db 44h, 84h, 85h, 45h, 87h, 47h, 46h, 86h, 82h, 42h
db 43h, 83h, 41h, 81h, 80h, 40h
CRC16:
xrl a, uchCRCHi ; uIndex = uchCRCHi ^ *puchMsg++;
mov r7, a
mov dptr, #auchCRCHi
movc a, @a+dptr
xrl a, uchCRCLo
mov uchCRCHi, a ; uchCRCHi = uchCRCLo ^ auchCRCHi[uIndex];
mov dptr, #auchCRCLo
mov a, r7
movc a, @a+dptr
mov uchCRCLo, a ; uchCRCLo = auchCRCLo[uIndex];
ret
SendReadHolding:
mov uchCRCHi, #0FFh
mov uchCRCLo, #0FFh
;
mov a, #01h ; Address
call SendChar
call CRC16
mov a, #03h ; Function Code = 03 (Read Holding Registers)
call SendChar
call CRC16
;
mov a, #00h
call SendChar
call CRC16
mov a, #00h ; Register Address 0000h
call SendChar
call CRC16
;
mov a, #00h
call SendChar
call CRC16
mov a, #01h ; Regisetr Count 0001h
call SendChar
call CRC16
;
mov a, uchCRCHi
call SendChar
mov a, uchCRCLo
call SendChar
ret
小弟太笨了实在是看不懂
我要如何把收到的串列资料丢到 20H -N H
假如我连续收到30H,31H,32H,
就把30H丢到20H的位址里
31H 21H
32H 22H
如果是30H-35H
就把30H 20H
31H 21H
32H 22H
33H 23H
34H 24H
35H 25H
然后把20H-25H位址做CRC16的判断
然后将CRC16的数值HI丢到R5
LO R6里
希望大大帮帮小弟 谢谢
|
