89C51单片机中_nop_()报错

#include<reg51.h>
#include<intrins.h>
#include<string.h>
#define uchar unsigned char
#define uint unsigned int
sbit CS=P1^0;
sbit CLK=P1^1;
sbit DIO=P1^2;
sbit RS=P2^0;
sbit RW=P2^1;
sbit E=P2^2;
#define LCD_PORT P0
uchar Disp_Buff1[]=" VOLTAGE: 0.00V";
uchar Disp_Buff2[16];
#define delay4us(){_nop_();_nop_(); _nop_();_nop();}
void delay_ms(uint x)
{
uchar t;
while(x--);
for(t=0;t<120;t++);
}
bit Read_LCD_Busy_Flag()
{
uchar result;
LCD_PORT=0xFF;
RS=0;RW=1;
E=1; delay4us(); result=P0; E=0;
return(result&0x80)?1:0;
}
void Write_LCD_Command(uchar cmd)
{
while(Read_LCD_Busy_Flag());
RS=0; RW=0;
E=0; _nop()_; _nop()_; LCD_PORT=cmd;
delay4us(); E=1; delay4us(); E=0;
}
void Write_LCD_Data(uchar dat)
{
while(Read_LCD_Busy_Flag());
RS=1; RW=0;
E=0; LCD_PORT=dat; delay4us();
E=1; delay4us(); E=0;
}
void LCD_Show_String(uchar r,uchar c,char *s)
{
uchar i=0;
uchar code DDRAM[]={0x80,0xC0};
Write_LCD_Command(DDRAM[r]|c);
while(s[i]&&i<16)
Write_LCD_Data(s[i++]);
}
void LCD_Initialise()
{
Write_LCD_Command(0x38); delay_ms(1);
Write_LCD_Command(0x0C); delay_ms(1);
Write_LCD_Command(0x06); delay_ms(1);
Write_LCD_Command(0x01); delay_ms(1);
}
uchar Get_AD_Result()
{
uchar i, dat1=0, dat2=0;
CS=0;   CLK=0;
DIO=1;          _nop()_;_nop()_;
CLK=1;          _nop()_;_nop()_;
CLK=0;  DIO=1;  _nop()_;_nop()_;
CLK=1;          _nop()_;_nop()_;
CLK=0;  DIO=0;  _nop()_;_nop()_;
CLK=1;          _nop()_;_nop()_;
CLK=0;  DIO=1;  _nop()_;_nop()_;
for(i=0;i<8;i++)
{
CLK=1;      _nop()_;_nop()_;
CLK=0;      _nop()_;_nop()_;
dat1=(dat1<<1)|DIO;
}
for(i=0;i<8;I++)
{
dat2=dat2|((uchar)DIO<<i);
CLK=1;      _nop()_;_nop()_;
CLK=0;      _nop()_;_nop()_;
}
CS=1;
return(dat1==dat2)?dat1:0x00;
}
void main()
{
uchar i,AD;uint d;
LCD_Initialise();
while(1)
{
AD=Get_AD_Result();
d= A/D *500.0*2/511.0;
Disp_Buff1[11]d/100 +'0';
Disp_Buff1[13]=d/10%10  +'0';
Disp_Buff1[14]=d%10 +'0';
i=(uint)AD*16/255;
memset(Disp_Buff2,'xFF',i);
memset(Disp_Buff2 +i,'xDB',16-i);
LCD_show_String(1,0,Disp_Buff2);
}
}

图片说明

请问各位大佬为什么我这个_nop_()会报错

回答

你一会儿 _nop()_ 一会儿 _nop()
应该是 _nop_()

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