lcm.h

用S52和1602液晶做的可进行设置的多级菜单

#define Lcd1602CmdPort XBYTE[0x0000]    //E=1 RS=0 RW=0
#define Lcd1602WdataPort XBYTE[0x0100]  //E =1 RS=1 RW=0
#define Lcd1602StatusPort XBYTE[0x0200] //E=1 RS=0 RW=1
#define Busy 0x80                       // 忙判别位

void LcdWriteCommand(unsigned char CMD,unsigned char AttribC);
void LcdWriteData(char dataW)reentrant;
void LcdReset(void);
void DispOneChar(unsigned char x,unsigned char y,unsigned char Wdata)reentrant;
void Delay400Ms(void);					 
void Delay5Ms(void);

void LcdWriteCommand(unsigned char CMD,unsigned char AttribC)
{
	if(AttribC)
	{
		while(Lcd1602StatusPort & Busy);
	}
	Lcd1602CmdPort = CMD;
}

void LcdWriteData( char dataW )reentrant 
{
	while( Lcd1602StatusPort & Busy );                // 检测忙信号
	Lcd1602WdataPort = dataW;
}

void Delay5Ms(void)				 	   //短延时
{
	unsigned int i = 5552;
	while(i--)_nop_();
}

void Delay400Ms(void)				   //长延时
{
	unsigned char i = 5;
	unsigned int j;
	while(i--)
	{
		j=7269;     
		while(j--)
		{
			_nop_();
		}
	};
 }

void LocateXY(char posx,char posy)reentrant
{  
	unsigned char temp;	
	temp = posx & 0x0f;
	posy &= 0x01;
	if ( posy )temp |= 0x40;
	temp |= 0x80;
	LcdWriteCommand(temp,0);
}

void DispOneChar(unsigned char x,unsigned char y,unsigned char Wdata)reentrant 
{
	LocateXY(x, y);                       // 定位显示地址
	LcdWriteData(Wdata);                  // 写字符
}

void LcdReset( void ) 
{  
	LcdWriteCommand( 0x38, 0);            // 显示模式设置(不检测忙信号)
	Delay5Ms();
	LcdWriteCommand( 0x38, 0);            // 共三次
	Delay5Ms();
	LcdWriteCommand( 0x38, 0);
	Delay5Ms();
	
	LcdWriteCommand( 0x38, 1);            // 显示模式设置(以后均检测忙信号)
	LcdWriteCommand( 0x08, 1);            // 显示关闭
	LcdWriteCommand( 0x01, 1);            // 显示清屏
	LcdWriteCommand( 0x06, 1);            // 显示光标移动设置
	LcdWriteCommand( 0x0c, 1);            // 显示开及光标设置
}

void printx(unsigned char x,unsigned char y,unsigned char *ptr)reentrant
{
	LocateXY(x, y);                       // 定位显示地址
	while(*ptr++!='\0')
	{
		LcdWriteData(*(ptr-1));
	}
}