lcd.c

本程序是AD MAX197驱动程序。精度高。

#include <reg52.h>

unsigned char Status , Data ,Command , i  ;
unsigned  char code max197 []   = "MAX197AD转换 " ;
unsigned  char code shuru  []   = "输入电压:      V";
#define LCD_Data  P0


sbit	LCD_RS		=P1^2;
sbit	LCD_E		=P1^0;
sbit	LCD_WR		=P1^1;



 LCDBusyWait()							//等待LCD就绪
{
	unsigned char Status;
	LCD_RS=0;
	LCD_WR=1;
	LCD_Data=0xFF;
	LCD_E=1;
	Status=LCD_Data;
	LCD_E=0;
	while(Status & 0x80)
	{
		LCD_E=1;
		Status=LCD_Data;
		LCD_E=0;
	}
	LCD_WR=0;
	return Status;
}

 WriteLCD_Data( unsigned char  Data )			//向LCD写入一个字节的数据
{
	LCDBusyWait();
	LCD_RS=1;
	LCD_Data = Data;
	LCD_E=1;
	LCD_E=0;
}

 WriteLCD_Command( unsigned char Command )	//向LCD写入一个字节的命令
{  
	LCDBusyWait();
	LCD_RS=0;
	LCD_Data=Command;
	LCD_E=1;
	LCD_E=0;
}

lcd_init ()
{

	unsigned int  i;
	WriteLCD_Command(0x01);	  //清屏
     for(i=0;i<2000;i++);
	WriteLCD_Command(0x30);	  //功能设置8位界面,
     for(i=0;i<2000;i++);
	WriteLCD_Command(0x0C);	  //显示开，光、光标关，反白显示
     for(i=0;i<2000;i++);
    WriteLCD_Command(0x06);	  //DDRAM地址自加
	   for(i=0;i<2000;i++);
}  


lcd_display (  unsigned char  display_data[] )

{  i = 0; 
   while ( display_data[i] != '\0')
   {
     Data = display_data [i] ;
	 WriteLCD_Data(Data) ;
     i++ ;
   }
}