1602.txt

1602是一款小型的液晶显示模块

#ifndef _SMC1602A_H_
#define _SMC1602A_H_

sbit LCM_RS=P2^0;
sbit LCM_RW=P2^1;
sbit LCM_E=P2^2;

#define SET 1;
#define CLR 0;

#define LCM_Data  P0
#define Busy    0x80 //用于检测LCM状态字中的Busy标

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 Delay5Ms(void);
//void Delay400Ms(void);
void Delay_xMs(unsigned int x);

#endif




#include"at89x52.h"
#include"stdio.h"
#include"absacc.h"
#include"smc1602a.h"


//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
         Delay_xMs(5); 
         WriteCommandLCM(0x38,0);
         Delay_xMs(5); 
         WriteCommandLCM(0x38,0);
         Delay_xMs(5); 
         WriteCommandLCM(0x07,1); //置输入模式光右移文字右移，
         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 tt; 
         tt = 0;
         Y &= 0x1;
         X &= 0xF; //限制X不能大于15，Y不能大于1
         while (DData[tt]>0x20) //若到达字串尾则退出
          {
                   if (X <= 0xF) //X坐标应小于0xF
                    {
                             DisplayOneChar(X, Y, DData[tt]); //显示单个字符
                             tt++;
                             X++;
                    }
          }
}


//延时
void Delay_xMs(unsigned int x)
{
       unsigned int i,j;
       for(i=0;i<x;i++)
       {
              for(j=0;j<1000;j++);
       };
}