/************************************************************************************ * Copyright (c) 2007,重庆优易特电子 * All rights reserved. * * 文件名称: main.c * 文件标识: none * 适用器件: STC89C51RC * * 摘 要: 1602液晶显示程序,显示简单的字母,也可以显示数字,但是不能显示汉字 * * 当前版本:1.0 * 作 者:sifan * 完成日期:2007年12月10日 * *************************************************************************************/ #include "reg51.h"
#define LCM_Data P0 //数据端口 #define Busy 0x80 //用于检测LCM状态字中的Busy标识
sbit LCM_RW= P1^3; //定义信号引脚 sbit LCM_RS= P1^2 ; sbit LCM_E= P1^4 ;
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); unsigned char code uctech[] = {"U-easytech.com"}; unsigned char code net[] = {"fretech.com"};
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, uctech); //在第一行显示"welcome!" DisplayListChar(0, 1, net); //在第二行显示"hxl_raien." ReadDataLCM(); //测试用句,可以不要 while(1); //不断循环,也称“死循环” } //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) //x表示列、y 表示行 { 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 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,字符长度小于32 { if (X <= 0xF) //X坐标应小于0xF(15) { DisplayOneChar(X, Y, DData[ListLength]); //显示单个字符 ListLength++; X++; } } } void Delay5Ms(void) //延时5ms { unsigned int i; for(i=0;i<5000;i++) ;; } void Delay400Ms(void) //延时400ms { unsigned char TempCycA = 5; unsigned int TempCycB; while(TempCycA--) { TempCycB=7269; while(TempCycB--); }; } |