Question

warning '_nop_': missing function-prototype error intrinsic '_nop_': declaration/activation error

总是出现错误
warning C206: '_nop_': missing function-prototype
error C264: intrinsic '_nop_': declaration/activation error
error C231: '_nop_': redefinition
warning C275: expression with possibly no effect
加了 intrins 头文件也不行，求大神指教
下面这是代码

#include <REGX52.H>
#include <intrins.h>
sbit LcdRs=P2^0;
sbit LcdRw=P2^1;
sbit LcdEn=P2^2;
sfr DBPort= 0x80;
unsigned char LCD_Wait(void)
{
LcdRs=0;
LcdRw=1; _nop_;
LcdEn=1; _nop_ ;
LcdEn=0;
return DBPort;
}
#define LCD_COMMAND 0
#define LCD_DATA 1
#define LCD_CLEAR_SCREEN 0x01
#define LCD_HOMING 0x02
void LCD_Write(bit style,unsigned char input)
{
LcdEn=0;
LcdRs=style;
LcdRw=0;
_nop_();
DBPort=input;
_nop_();
LcdEn=1;
_nop_();
LcdEn=0;
_nop_();
LCD_Wait();
}

#define LCD_SHOW 0x04
#define LCD_HIDE 0x00
#define LCD_CURSOR 0x02
#define LCD_NO_CURSOR 0x00
#define LCD_FLASH 0x01
#define LCD_NO_FLASH 0x00
void LCD_SetDisplay(unsigned char DisplayMode)
{
LCD_Write(LCD_COMMAND,0x08|DisplayMode);
}

#define LCD_AC_UP 0x02
#define LCD_AC_DOWN 0x00
#define LCD_MOVE 0x01
#define LCD_NO_MOVE 0x00
void LCD_SetInput(unsigned char InputMode)
{
LCD_Write(LCD_COMMAND,0x04|InputMode);
}
void LCD_Initial()
{LcdEn=0;
LCD_Write(LCD_COMMAND,0x38);
LCD_Write(LCD_COMMAND,0x38);
LCD_SetDisplay(LCD_SHOW|LCD_NO_CURSOR);
LCD_Write(LCD_COMMAND,LCD_CLEAR_SCREEN);
LCD_SetInput(LCD_AC_UP|LCD_NO_MOVE);
}
void GotoXY(unsigned char x,unsigned char y)
{
if(y==0)
LCD_Write(LCD_COMMAND,0x80|x);
if(y==1)
LCD_Write(LCD_COMMAND,0x80|(x-0x40));
}
void Print(unsigned char*str)
{
while(*str!='\0')
{
LCD_Write(LCD_DATA,*str);
str++;
}
}

Answer 1

你自己写的程序都不记得了，也看不到吗？
#include <REGX52.H>
#include <intrins.h>
sbit LcdRs=P2^0;
sbit LcdRw=P2^1;
sbit LcdEn=P2^2;
sfr DBPort= 0x80;
unsigned char LCD_Wait(void)
{
LcdRs=0;
LcdRw=1; _nop_; //看这里， 应该是_nop_(); 你写的缺括号
LcdEn=1; _nop_ ;//看这里， 应该是_nop_();你写的缺括号
LcdEn=0;
return DBPort;
}

追问

可能是我改的时候给傻了，一开始我是加上括号的，但是第一次运行就是错误

追答

第一次运行，是没有加#include 吧
你现在加上括号，看还错不错就行了，纪结过去有用吗？