1602液晶显示c代码

SMC1602A(16*2)模拟口线接线方式

连接线图:

   -------------------------------------------------

   |LCM-----51   | LCM-----51   | LCM------51      |

   |-------------|--------------|------------------|

   |DB0-----P1.0 | DB4-----P1.4 | RW-------P2.0    |

   |DB1-----P1.1 | DB5-----P1.5 | RS-------P2.1    |

   |DB2-----P1.2 | DB6-----P1.6 | E--------P2.2    |

   |DB3-----P1.3 | DB7-----P1.7 | VLCD接1K电阻到GND|

   -------------------------------------------------

[注:AT89S51使用12M晶振]

=============================*/

# include <at89x51.h>
# 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 
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[] = {"uctech"};
unsigned char code net[] = {"uctech.icpcn.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(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 
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--);
}
//400ms延时 
void Delay400Ms(void)
{
        unsigned char TempCycA = 5;
        unsigned int TempCycB;
        while(TempCycA--)
        {
                TempCycB=7269;
                while(TempCycB--);
        };
}

下一篇链接：用AT89C2051的6位电子钟 上一篇链接：MCS-51单片机特性