lcm1602.c

一个使用adc0809进行数据采集,采用1602液晶显示模拟电压的源程序,已经调试通过.

//#include "scancodes.h"

#include <REG51.H>
#include <stdio.h>

sbit 		LCM_RW 		= P3^6; //定义LCD引脚
sbit		LCM_RS 		= P3^7;
sbit		LCM_E  		= P3^5;
#define 	LCM_Data 	P1
#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[] = {"-www.cdle.net--"};
unsigned char code email[] = {"[e-mail]"};
unsigned char code Cls[] = {" "};



void main(void)
{
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);
}

//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--);
	};
}