[ 注 :AT89S51 使用 12M 晶振 ]
/*==========================================================*/

#include <reg51.h>
#define LCM_Data P1
#define Busy 0x80 // 用于检测 LCM 状态字中的 Busy 标识
sbit LCM_RW P2^0; //定义引脚
sbit LCM_RS P2^1;
sbit LCM_E P2^2;

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 csdn[] = {"csdn"};
unsigned char code net[] = {www.csdn.net};
void main(void)
{
LCMInit(); //LCM 初始化
Delay5Ms(); // 延时片刻 ( 可不要 )
DisplayListChar(0, 5, csdn);
DisplayListChar(1, 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
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 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--);
}