lcd1602.c

这是单片机实验板比较齐全的程序

/*============================================================
使用1602液晶显示和PS/2键盘的示例     孟猛  2006/2
-------------------------------------------------
Tel:[phone]
==============================================================

  SMC1602A(16*2)模拟口线接线方式
  连接线图:	
  
	---------------------------------------------------
	|LCM-----51   |	LCM-----51   |	LCM------51      |
	--------------------------------------------------|
	|DB0-----P0.0 |	DB4-----P0.4 |	RW-------P2.2    |
	|DB1-----P0.1 |	DB5-----P0.5 |	RS-------P2.1    |
	|DB2-----P0.2 |	DB6-----P0.6 |	E--------P2.0    |
	|DB3-----P0.3 |	DB7-----P0.7 |	VLCD接1K电阻到GND|
	---------------------------------------------------
	
	  Keyboard接线
	  
		
		  PS/2--------51
		  1 DATA------P2.7
		  3 GND
		  4 VCC
		  5 CLK-------P3.2 接在51的外部中断，触发方式为低电平
		  
			
			  本程序源码只供学习参考，不得应用于商业用途，如有需要请联系作者。
			  
				[注:AT89x51使用12M或11.0592M晶振,实测使用11.0592M]
				[Keil uV2 7.01编译运行通过 程序中没有做键盘数据的奇偶校验]
				
=============================================================*/
#include <reg51.h>
#include "scancodes.h"
#include "sybxt1.h"
sbit LCM_RW=  P2^2; //定义LCD引脚
sbit LCM_RS=  P2^1;
sbit LCM_E =  P2^0;
#define LCM_Data  P0
sbit Key_Data= P2^7; //定义Keyboard引脚
sbit Key_CLK = P3^2;
#define Busy    0x80 //用于检测LCM状态字中的Busy标识
void LCMInit(void);
void DisplayOneChar(unsigned char X, unsigned char Y, unsigned char DData);
void DisplayListChar(unsigned char X, unsigned char Y, unsigned char code *DData);
void Delay5Ms(void);
void Delay400Ms(void);
void Decode(unsigned char ScanCode);
void WriteDataLCM(unsigned char WDLCM);
void WriteCommandLCM(unsigned char WCLCM,BuysC);
unsigned char ReadDataLCM(void);
unsigned char ReadStatusLCM(void);
unsigned char code cdle_net[] = {"--nice to you--"};
unsigned char code email[] = {"[e-mail]"};
unsigned char code Cls[] = {"                "};
static unsigned char IntNum = 0; //中断次数计数
static unsigned char KeyV; //键值
static unsigned char DisNum = 0; //显示用指针
static unsigned char Key_UP=0, Shift = 0;//Key_UP是键松开标识，Shift是Shift键按下标识
static unsigned char BF = 0; //标识是否有字符被收到
void DisplayString ()
{
	while(uiOffset!=uiRxCount)
	{
		if (DisNum > 15)
		{
			DisplayListChar(0, 1, Cls);//清LCD第二行
			DisNum = 0; 
		}
		DisplayOneChar(DisNum, 1,ucRxBuf[uiOffset]);
		DisNum++;
		
		uiOffset++;
		uiOffset%=RXBUFSIZE;
	}
}
void sysinit()
{
	unsigned char TempCyc;
	Delay400Ms(); //启动等待，等LCM讲入工作状态
	LCMInit(); //LCM初始化
	Delay5Ms(); //延时片刻(可不要)
	DisplayListChar(0, 0, cdle_net);
	DisplayListChar(0, 1, email);
	ReadDataLCM();//测试用句无意义
	for (TempCyc=0; TempCyc<10; TempCyc++)
		Delay400Ms(); //延时
	DisplayListChar(0, 1, Cls);	
	IT0 = 0; //设外部中断0为低电平触发
	EA = 1;
	EX0 = 1; //开中断
}
void GetPs2Key(void)
{ 
	if (BF)
		Decode(KeyV);
	else
		EA = 1; //开中断
}

//写数据
void WriteDataLCM(unsigned char WDLCM) 
{
	ReadStatusLCM(); //检测忙
	LCM_Data = WDLCM;
	LCM_RS = 1;
	LCM_RW = 0;
	LCM_E = 0; //若晶振速度太高可以在这后加小的延时
	LCM_E = 0; //延时
	LCM_E = 1;
}
//写指令
void WriteCommandLCM(unsigned char WCLCM,BuysC) //BuysC为0时忽略忙检测
{
	if (BuysC) ReadStatusLCM(); //根据需要检测忙
	LCM_Data = WCLCM;
	LCM_RS = 0;
	LCM_RW = 0;	
	LCM_E = 0;
	LCM_E = 0;
	LCM_E = 1;	
}

//读数据
unsigned char ReadDataLCM(void)
{
	LCM_RS = 1; 
	LCM_RW = 1;
	LCM_E = 0;
	LCM_E = 0;
	LCM_E = 1;
	return(LCM_Data);
}
//读状态
unsigned char ReadStatusLCM(void)
{
	LCM_Data = 0xFF; 
	LCM_RS = 0;
	LCM_RW = 1;
	LCM_E = 0;
	LCM_E = 0;
	LCM_E = 1;
	while (LCM_Data & Busy); //检测忙信号
	return(LCM_Data);
}
void LCMInit(void) //LCM初始化
{
	LCM_Data = 0;
	WriteCommandLCM(0x38,0); //三次显示模式设置，不检测忙信号
	Delay5Ms(); 
	WriteCommandLCM(0x38,0);
	Delay5Ms(); 
	WriteCommandLCM(0x38,0);
	Delay5Ms(); 
	WriteCommandLCM(0x38,1); //显示模式设置,开始要求每次检测忙信号
	WriteCommandLCM(0x08,1); //关闭显示
	WriteCommandLCM(0x01,1); //显示清屏
	WriteCommandLCM(0x06,1); // 显示光标移动设置
	WriteCommandLCM(0x0F,1); // 显示开及光标设置
}
//按指定位置显示一个字符
void DisplayOneChar(unsigned char X, unsigned char Y, unsigned char DData)
{
	Y &= 0x1;
	X &= 0xF; //限制X不能大于15，Y不能大于1
	if (Y) X |= 0x40; //当要显示第二行时地址码+0x40;
	X |= 0x80; //算出指令码
	WriteCommandLCM(X, 1); //发命令字
	WriteDataLCM(DData); //发数据
}
//按指定位置显示一串字符
void DisplayListChar(unsigned char X, unsigned char Y, unsigned char code *DData)
{
	unsigned char ListLength;
	ListLength = 0;
	Y &= 0x1;
	X &= 0xF; //限制X不能大于15，Y不能大于1
	while (DData[ListLength]>0x19) //若到达字串尾则退出
	{
		if (X <= 0xF) //X坐标应小于0xF
		{
			DisplayOneChar(X, Y, DData[ListLength]); //显示单个字符
			
			ListLength++;
			X++;
		}
	}
}
//5ms延时
void Delay5Ms(void)
{
	unsigned int TempCyc = 5552;
	while(TempCyc--);
}
//400ms延时
void Delay400Ms(void)
{
	unsigned char TempCycA = 5;
	unsigned int TempCycB;
	while(TempCycA--)
	{
		TempCycB=7269;
		while(TempCycB--);
	};
}

void Keyboard_out(void) interrupt 0
{
	if ((IntNum > 0) && (IntNum < 9))
	{			
		KeyV = KeyV >> 1; //因键盘数据是低>>高，结合上一句所以右移一位
		if (Key_Data) KeyV = KeyV | 0x80; //当键盘数据线为1时为1到最高位
	}
	IntNum++;
	while (!Key_CLK); //等待PS/2CLK拉高
	
	if (IntNum > 10)
	{
		IntNum = 0; //当中断11次后表示一帧数据收完，清变量准备下一次接收
		BF = 1; //标识有字符输入完了
		EA = 0; //关中断等显示完后再开中断 (注：如这里不用BF和关中断直接调Decode()则所Decode中所调用的所有函数要声明为再入函数)
	}
}

void Decode(unsigned char ScanCode) //注意:如SHIFT+G为12H 34H F0H 34H F0H 12H，也就是说shift的通码+G的通码+shift的断码+G的断码
{
	unsigned char TempCyc;	
	
	if (!Key_UP)                //当键盘松开时
	{
		switch (ScanCode)
		{
		case 0xF0 :	// 当收到0xF0，Key_UP置1表示断码开始
			Key_UP = 1;
			break;
			
		case 0x12 :	// 左 SHIFT
			Shift = 1;
			break;
			
		case 0x59 :	// 右 SHIFT
			Shift = 1;
			break;
			
		default:						
			if (DisNum > 15)
			{
				DisplayListChar(0, 1, Cls);//清LCD第二行
				DisNum = 0; 
			}
			if(!Shift)	//如果SHIFT没按下
			{
				for (TempCyc = 0;(UnShifted[TempCyc][0]!=ScanCode)&&(TempCyc<59); TempCyc++); //查表显示
				if (UnShifted[TempCyc][0] == ScanCode) DisplayOneChar(DisNum, 1, UnShifted[TempCyc][1]);
				DisNum++;
			} 
			else  //按下SHIFT
			{
				for(TempCyc = 0; (Shifted[TempCyc][0]!=ScanCode)&&(TempCyc<59); TempCyc++); //查表显示
				if (Shifted[TempCyc][0] == ScanCode) DisplayOneChar(DisNum, 1, Shifted[TempCyc][1]);
				DisNum++;
			}
			break;
		}
	}
	else
	{	
		Key_UP = 0;
		switch (ScanCode) //当键松开时不处理判码，如G 34H F0H 34H 那么第二个34H不会被处理
		{
		case 0x12 :	// 左 SHIFT
			Shift = 0;
			break;
		case 0x59 :	// 右 SHIFT
			Shift = 0;
			break;
		}
	}
	BF = 0; //标识字符处理完了
}