lcm1602.c

麦迪工作室51开发板LCM1602液晶屏驱动代码。可点亮1602液晶屏。

#include "atmel89x51.h"
#include <string.h>
#define LCM_RW P3_3 //定义引脚
#define LCM_RS P3_2
#define LCM_E P3_5
#define LCM_Data P0	
#define Busy 0x80 //用于检测LCM状态字中的Busy标识
void WriteDataLCM(unsigned char WDLCM);		//写数据函数 
void WriteCommandLCM(unsigned char WCLCM,BuysC);//写指令函数
unsigned char ReadDataLCM(void);	//读数据
unsigned char ReadStatusLCM(void);//读状态
void LCMInit(void); //LCM初始化
void DisplayOneChar(unsigned char X, unsigned char Y, unsigned char DData);//按指定位置显示一个字符
void DisplayListChar(unsigned char X, unsigned char Y, unsigned char code *DData);
void Delay5Ms(void);
void Delay400Ms(void);
unsigned char code McuDsp_com[] = {"www.McuDsp.com"};
unsigned char code email[] = {"MD test"};
void main(void)
{
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(1, 0, McuDsp_com);
DisplayListChar(4, 1, email);
ReadDataLCM();//测试用句无意义
while(1);
}

//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(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);
}

void DisplayListChar(unsigned char X, unsigned char Y, unsigned char code *PlayData)
{
  unsigned char ListLength,j;
  ListLength = strlen(PlayData);
  Y &= 0x1;
  X &= 0xF; //限制X不能大于15，Y不能大于1
      if (X <= 0xF) //X坐标应小于0xF
        { 
		    for(j=0;j<ListLength;j++)
		      {
             DisplayOneChar(X, Y, PlayData[j]); //显示单个字符
             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--);
};
}