单片机C语言教程:C51数组的使用
/*============================================================
使用1602 液晶显示的实验例子
==============================================================
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 晶体震荡器]
=============================================================*/
#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
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 cdle_net[] = {www.xx.com};
unsigned char code email[] = {pnzwzw@xx.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, 0, cdle_net); DisplayListChar(0, 1, email); 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; //若晶体震荡器速度太高能在这后加小的延时
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--);
};
}
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