sramtestc.c

16x2字符液晶调试程序

#include <reg51.h> 
#include <intrins.h>

#define uchar unsigned char
#define nop() _nop_()
#define LCM_Data P0 
#define Busy    0x80  //用于检测LCM状态字中的Busy标识
sbit LCM_RW=P1^3;  //定义LCD引脚
sbit LCM_RS=P1^1; 
sbit LCM_E=P1^2;

uchar code cdle_net[] = {"--xsgylyzhb--"};
uchar code email[] = {"[e-mail]"};

//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--);
		};
}
//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);
}

//写数据
void WriteDataLCM(unsigned char WDLCM) 
{
	ReadStatusLCM(); //检测忙
	LCM_Data=WDLCM;
	LCM_RS=1;
	LCM_RW=0;
	LCM_E=0; //
	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;	
}

//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
}


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++;
				}
		}
}


void main()
{  
   Delay400Ms(); //启动等待，等LCM讲入工作状态
   LCMInit(); //LCM初始化    
   DisplayListChar(0, 0, cdle_net);
   DisplayListChar(0, 1, email);  
   while(1);
}