lcddisp.h

基于单片机的自行车计时、计速、计程的码表设计

#define LCM_RW  P2_0 //定义引脚
#define LCM_RS  P2_1
#define LCM_E   P2_2
#define LCM_Data  P1
#define Busy    0x80 //用于检测LCM状态字中的Busy标识

#include <at89x51.h>

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 *DData);
void Delay5Ms(void);
void Delay400Ms(void);

//unsigned char code uctech[] = {"uctech"};
//unsigned char code net[] = {"uctech.icpcn.com"};

/*void main(void)
{
 Delay400Ms(); //启动等待，等LCM进入工作状态
 LCMInit(); //LCM初始化
 Delay5Ms(); //延时片刻(可不要)

 DisplayListChar(0, 5, uctech);
 DisplayListChar(0, 0, net);
 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，其中（X，Y即为显示字符的起始坐标）
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 *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++;
    }
  }
}

//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--);
 };
}