keil编译优化问题

只看该作者 · 2009-11-14 13:12

我在测试端写的电平状态时写了如下代码：
#define LO1_ADDR XBYTE[0x1FFF]

unsigned char bdata TranByte;
sbit SDIO = TranByte^0;

void mian()
{
SDIO = 0;
LO1_ADDR = TranByte;
SDIO = 1;
LO1_ADDR = TranByte;

SDIO = 0;
LO1_ADDR = TranByte;
SDIO = 1;
LO1_ADDR = TranByte;
}
优化级别是默认的，但是后面的代码LO1_ADDR = TranByte;被优化了，导致写出的电平状态不对。
不知道该如何解决，去掉优化？

只看该作者 · 2009-11-16 11:13

没优化呀？

10: void mian()
11: {
12: SDIO = 0;
C:0x0000 C200    CLR    SDIO(0x20.0)
13: LO1_ADDR = TranByte;
C:0x0002 901FFF MOV    DPTR,#0x1FFF
C:0x0005 E520    MOV    A,TranByte(0x20)
C:0x0007 F0    MOVX    @DPTR,A
14: SDIO = 1;
C:0x0008 D200    SETB    SDIO(0x20.0)
15: LO1_ADDR = TranByte;
16:
C:0x000A E520    MOV    A,TranByte(0x20)
C:0x000C F0    MOVX    @DPTR,A
17: SDIO = 0;
C:0x000D C200    CLR    SDIO(0x20.0)
18: LO1_ADDR = TranByte;
C:0x000F E520    MOV    A,TranByte(0x20)
C:0x0011 F0    MOVX    @DPTR,A
19: SDIO = 1;
C:0x0012 D200    SETB    SDIO(0x20.0)
20: LO1_ADDR = TranByte;
C:0x0014 E520    MOV    A,TranByte(0x20)
C:0x0016 F0    MOVX    @DPTR,A
21: }
C:0x0017 22    RET
C:0x0018 00    NOP
C:0x0019 00    NOP
C:0x001A 00    NOP
C:0x001B 00    NOP
C:0x001C 00    NOP
C:0x001D 00    NOP