lcddisplay.c

LCD(1602).rar

/**********************************Copyright (c)**************************************************
   
**--------------文件信息---------------------------------------------------------------------------
功能:在LCD上显示汉字信息     

**-------------------------------------------------------------------------------------------------
***************************************************************************************************/

#include <c8051f020.h>                 // SFR declarations
#include <intrins.h>
#include <stdio.h>

#define uchar unsigned char          
#define uint  unsigned int 
#define _Nop() _nop_()

#define LCM_Data   P5
#define SYSCLK       22118400          // SYSCLK frequency in Hz

#define Busy 0x80 //用于检测LCM状态字中的Busy标识

unsigned char code c8051info[] = "C8051F020";
unsigned char code supportinfo[] = "QQ:123456789";

//-----------------------------------------------------------------------------
// 液晶接口定义
//-----------------------------------------------------------------------------
#define LCDRSLow  P6&=~0x80;
#define LCDRSHigh P6|=0x80;     //DI

#define LCDRWLow  P6&=~0x40;
#define LCDRWHigh P6|=0x40;     //RW

#define LCDELow  P6&=~0x20;
#define LCDEHigh P6|=0x20;      //E

//--------------------------------------------------------------------
// 函数原型
//--------------------------------------------------------------------
void SYSCLK_Init (void);
void PORT_Init (void);

void WriteDataLCM(unsigned char WDLCM);
void WriteCommandLCM(unsigned char WCLCM,BuysC);
unsigned char ReadDataLCM(void);
unsigned char ReadStatusLCM(void);
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 DelayMs(uchar t);
void Delay(uint k);

//-----------------------------------------------------------------------------
// 延时
//-----------------------------------------------------------------------------
void DelayMs(uchar t)
{
 uchar  i,j;
 uchar Y=11;
 uchar X=200;
 do 
	{
     j=Y;
     do 
		{
		i=X;
		do 
			{
			_Nop();_Nop();//n个NOP
			}while(--i);
		}while(--j);     
    }while( --t );  
}
//-----------------------------------------------------------------------------
// 延时
//-----------------------------------------------------------------------------
void Delay(uint k)
{ 
 do 
	{   
    
    }while( --k ); 
}

//-----------------------------------------------------------------------------
//写数据
//-----------------------------------------------------------------------------

void WriteDataLCM(unsigned char WDLCM)
{
	ReadStatusLCM(); //检测忙
	LCM_Data = WDLCM;Delay(10);    
	LCDRSHigh;Delay(10);    
	LCDRWLow; Delay(10);    
	LCDELow; 	//若晶振速度太高可以在这后加小的延时
	Delay(200);
	LCDEHigh; Delay(10);
}
//-----------------------------------------------------------------------------
//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;Delay(10); 
	LCDRSLow; Delay(10);    
	LCDRWLow; Delay(10);    
	LCDELow; 
	Delay(200);
	LCDEHigh; Delay(10);
    
}
//-----------------------------------------------------------------------------
//读数据
//-----------------------------------------------------------------------------

unsigned char ReadDataLCM(void)
{
	LCDRSHigh; Delay(10);
	LCDRWHigh; Delay(10);
	LCDELow; 
	Delay(200);
	LCDEHigh;  Delay(10);
	return(LCM_Data);
}
//-----------------------------------------------------------------------------
//读状态
//-----------------------------------------------------------------------------

unsigned char ReadStatusLCM(void)
{
	LCM_Data = 0xFF; 
	LCDRSLow; Delay(10);
	LCDRWHigh;Delay(10);
	LCDELow; 
	Delay(200);
	LCDEHigh; Delay(10);
	while (LCM_Data & Busy); //检测忙信号
	return(LCM_Data);
}
//-----------------------------------------------------------------------------
//LCM初始化
//-----------------------------------------------------------------------------
void LCMInit(void) 
{
	LCM_Data = 0;
	WriteCommandLCM(0x38,0); //三次显示模式设置，不检测忙信号
	DelayMs(10); 
	WriteCommandLCM(0x38,0);
	DelayMs(10); 
	WriteCommandLCM(0x38,0);
	DelayMs(10);  
	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(0x0C,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, 0);  //这里不检测忙信号，发送地址码
	WriteDataLCM(DData);
}
//-----------------------------------------------------------------------------
//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]>0x20)  //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++;
			}
		}
}

//-----------------------------------------------------------------------------
// 通用I/O口及交叉开关初始化
//-----------------------------------------------------------------------------
void PORT_Init (void)
{            

  XBR2     = 0x40;          // 交叉开关使能       		

}
//-----------------------------------------------------------------------------
// 系统时钟初始化
//-----------------------------------------------------------------------------

void SYSCLK_Init (void)
{
   int i;                              // delay counter

   OSCXCN = 0x67;                      // start external oscillator with
                                       // 22.1184MHz crystal
   for (i=0; i < 256; i++) ;           // XTLVLD blanking interval (>1ms)

   while (!(OSCXCN & 0x80)) ;          // Wait for crystal osc. to settle

   OSCICN = 0x88;                      // select external oscillator as SYSCLK
                                       // source and enable missing clock
                                       // detector
}
//-----------------------------------------------------------------------------
// 主程序
//-----------------------------------------------------------------------------

void main()
{ 

  WDTCN = 0xde;
  WDTCN = 0xad;                //禁止看门狗定时器  

  SYSCLK_Init ();	
  PORT_Init();  	
 
  LCMInit(); //LCM初始化 
  DisplayListChar(1, 0, c8051info);
  DisplayListChar(2, 1, supportinfo);

  while(1);

}