用winavr读取I/O口寄存器，汇编结果不对，请问c代码哪句错了
UINT8 *p=NULL;p=(UINT8*)(0x31);
ClrBit(*p,5);
7e4: 8d 98 cbi 0x11, 5 ; 17
//====定义I/O寄存器指针和AD引脚=====
UINT8 ADSK=0;
UINT8 ADDO=0;
UINT8 *pPORT=NULL;
UINT8 *pDDR=NULL;
UINT8 *pPIN=NULL;
switch(u8ADChannel)
{
case AD0:
{
ADSK=_ADSK0;
ADDO=_ADDO0;
pPORT=(UINT8*)(0X32);
pDDR=(UINT8*)(0X31);
pPIN=(UINT8*)(0X30);
}break;
case AD1:
{
ADSK=_ADSK1;
ADDO=_ADDO1;
pPORT=(UINT8*)(0X32);
pDDR=(UINT8*)(0X31);
pPIN=(UINT8*)(0X30);
}break;
case AD2:
{
ADSK=_ADSK2;
ADDO=_ADDO2;
pPORT=(UINT8*)(0X38);
pDDR=(UINT8*)(0X37);
pPIN=(UINT8*)(0X36);
}break;
case AD3:
{
ADSK=_ADSK3;
ADDO=_ADDO3;
pPORT=(UINT8*)(0X38);
pDDR=(UINT8*)(0X37);
pPIN=(UINT8*)(0X36);
}break;
default:break;
}
//======端口初始化========
ClrBit(*pDDR,ADDO);//ADDO设置为输入
ClrBit(*pDDR,ADDO);//ADDO设置为输入
25e: 21 e0 ldi r18, 0x01 ; 1
260: 30 e0 ldi r19, 0x00 ; 0
262: 69 01 movw r12, r18
264: 05 2e mov r0, r21
266: 02 c0 rjmp .+4 ; 0x26c <HX711Read+0x78>
268: cc 0c add r12, r12
26a: dd 1c adc r13, r13
26c: 0a 94 dec r0
26e: e2 f7 brpl .-8 ; 0x268 <HX711Read+0x74>
270: 9c 2d mov r25, r12
272: 90 95 com r25
274: 80 81 ld r24, Z
276: 89 23 and r24, r25
278: 80 83 st Z, r24
页:
[1]