求高手解读avr程序，贴出部分代码，报酬丰厚

只看该作者 · 2016-5-4 21:36

+00000118: 93BA       ST       -Y,R27       Store indirect and predecrement
+00000119: 01D8       MOVW    R26,R16       Copy register pair
+0000011A: B60F       IN       R0,0x3F       In from I/O location
+0000011B: D012       RCALL    PC+0x0013    Relative call subroutine
+0000011C: 934001C0 STS    0x01C0,R20    Store direct to data space
+0000011E: 935001C1 STS    0x01C1,R21    Store direct to data space
+00000120: 913D       LD       R19,X+       Load indirect and postincrement
+00000121: 933001C4 STS    0x01C4,R19    Store direct to data space
+00000123: 952A       DEC    R18          Decrement
+00000124: F019       BREQ    PC+0x04       Branch if equal
+00000125: 5F4F       SUBI    R20,0xFF    Subtract immediate
+00000126: 4F5F       SBCI    R21,0xFF    Subtract immediate with carry
+00000127: CFF4       RJMP    PC-0x000B    Relative jump
+00000128: D022       RCALL    PC+0x0023    Relative call subroutine
+00000129: F789       BRNE    PC-0x0E       Branch if not equal
+0000012A: 91B9       LD       R27,Y+       Load indirect and postincrement
+0000012B: 91A9       LD       R26,Y+       Load indirect and postincrement
+0000012C: 9009       LD       R0,Y+       Load indirect and postincrement
+0000012D: 9508       RET                   Subroutine return
+0000012E: 911001CF LDS    R17,0x01CF    Load direct from data space
+00000130: FD17       SBRC    R17,7       Skip if bit in register cleared
+00000131: CFFC       RJMP    PC-0x0003    Relative jump
+00000132: 94F8       CLI                   Global Interrupt Disable
+00000133: FF11       SBRS    R17,1       Skip if bit in register set
+00000134: C008       RJMP    PC+0x0009    Relative jump
+00000135: E316       LDI    R17,0x36    Load immediate
+00000136: 931001CA STS    0x01CA,R17    Store direct to data space
+00000138: ED18       LDI    R17,0xD8    Load immediate
+00000139: BF14       OUT    0x34,R17    Out to I/O location
+0000013A: E011       LDI    R17,0x01    Load immediate
+0000013B: 931001CB STS    0x01CB,R17    Store direct to data space
+0000013D: 2F26       MOV    R18,R22       Copy register
+0000013E: 2F34       MOV    R19,R20       Copy register
+0000013F: E210       LDI    R17,0x20    Load immediate
+00000140: 713F       ANDI    R19,0x1F    Logical AND with immediate
+00000141: 1B13       SUB    R17,R19       Subtract without carry
+00000142: 1712       CP       R17,R18       Compare
+00000143: F408       BRCC    PC+0x02       Branch if carry cleared
+00000144: 2F21       MOV    R18,R17       Copy register
+00000145: 1B62       SUB    R22,R18       Subtract without carry
+00000146: 4070       SBCI    R23,0x00    Subtract immediate with carry
+00000147: E313       LDI    R17,0x33    Load immediate
+00000148: 931001CA STS    0x01CA,R17    Store direct to data space
+0000014A: 9508       RET                   Subroutine return

只看该作者 · 2016-5-4 21:45

高手来高手来高手来，重要的事情说三遍：求牛人，求牛人，求牛人，帮我解释这份程序，贴出只是一部分，整个程序是1500行左右；

只看该作者 · 2016-5-7 15:45

反汇编的程序，**别人的程序？
这个需要很清楚硬件才可以，并且很费精力滴！

只看该作者 · 2016-5-7 16:32

A118:
ST       -Y,R27
MOVW    R26,R16
IN       R0,0x3F
A11B:
RCALL    A12E
A11C:
STS    0x01C0,R20
STS    0x01C1,R21
LD       R19,X+
STS    0x01C4,R19
DEC    R18
BREQ    A128
SUBI    R20,0xFF
SBCI    R21,0xFF
RJMP    A11C
A128:
RCALL    A14B
BRNE    A11B
LD       R27,Y+
LD       R26,Y+
LD       R0,Y+
RET
//-------------------------------
A12E:
LDS    R17,0x01CF
SBRC    R17,7
RJMP    A12E
CLI
SBRS    R17,1
RJMP    A13D
LDI    R17,0x36
STS    0x01CA,R17
LDI    R17,0xD8
OUT    0x34,R17
LDI    R17,0x01
STS    0x01CB,R17
A13D:
MOV    R18,R22
MOV    R19,R20
LDI    R17,0x20
ANDI    R19,0x1F
SUB    R17,R19
CP       R17,R18
BRCC    A145
MOV    R18,R17
A145:
SUB    R22,R18
SBCI    R23,0x00
LDI    R17,0x33
STS    0x01CA,R17
RET