lcd1602.ino

/*
程序在開始時對液晶模塊功能進行了初始化設置，約定了顯示格式。注意顯示字符時光標是自動右移的，無需人工干預，每次輸入指令都先調用判斷液晶模塊是否忙的子程序DELAY，然後輸入顯示位置的地址0C0H，最後輸入要顯示的字符A的代碼41H 。
SMC1602A(16*2)模擬口線接線方式
連接線圖:
————————————————– –
|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電阻到GND|
————————————————– –
[注:AT89S52使用12M晶振]
================================================== ===========*/

#define LCM_RW P2_0 //定義引腳
#define LCM_RS P2_1
#define LCM_E P2_2
#define LCM_Data P1
#define Busy 0x80 /​​/用於檢測LCM狀態字中的Busy標識

#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 uctech[] = {「uctech」};
unsigned char code net[] = {「uctech.icpcn.com「};

void main(void)
{
Delay400Ms(); //啟動等待，等LCM講入工作狀態
LCMInit(); //LCM初始化
Delay5Ms(); //延時片刻(可不要)

DisplayListChar(0, 5, uctech);
DisplayListChar(0, 0, net);
ReadDataLCM();//測試用句無意義
while(1);
}

//寫數據
void WriteDataLCM(unsigned char WDLCM)
{
ReadStatusLCM(); //檢測忙
LCM_Data = WDLCM;
LCM_RS = 1;
LCM_RW = 0;
LCM_E = 0; //若晶振速度太高可以在這後加小的延時
LCM_E = 0; //延時
LCM_E = 1;
}

//寫指令
void WriteCommandLCM(unsigned char WCLCM,BuysC) //BuysC為0時忽略忙檢測
{
if (BuysC) ReadStatusLCM(); //根據需要檢測忙
LCM_Data = WCLCM;
LCM_RS = 0;
LCM_RW = 0;
LCM_E = 0;
LCM_E = 0;
LCM_E = 1;
}

//讀數據
unsigned char ReadDataLCM(void)
{
LCM_RS = 1;
LCM_RW = 1;
LCM_E = 0;
LCM_E = 0;
LCM_E = 1;
return(LCM_Data);
}

//讀狀態
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); //檢測忙信號
return(LCM_Data);
}

void LCMInit(void) //LCM初始化
{
LCM_Data = 0;
WriteCommandLCM(0x38,0); //三次顯示模式設置，不檢測忙信號
Delay5Ms();
WriteCommandLCM(0x38,0);
Delay5Ms();
WriteCommandLCM(0x38,0);
Delay5Ms();

WriteCommandLCM(0x38,1); //顯示模式設置,開始要求每次檢測忙信號
WriteCommandLCM(0x08,1); //關閉顯示
WriteCommandLCM(0x01,1); //顯示清屏
WriteCommandLCM(0x06,1); // 顯示光標移動設置
WriteCommandLCM(0x0C,1); // 顯示開及光標設置
}

//按指定位置顯示一個字符
void DisplayOneChar(unsigned char X, unsigned char Y, unsigned char DData)
{
Y &= 0x1;
X &= 0xF; //限制X不能大於15，Y不能大於1
if (Y) X |= 0x40; //當要顯示第二行時地址碼+0x40;
X |= 0x80; // 算出指令碼
WriteCommandLCM(X, 0); //這裡不檢測忙信號，發送地址碼
WriteDataLCM(DData);
}

//按指定位置顯示一串字符
void DisplayListChar(unsigned char X, unsigned char Y, unsigned char code *DData)
{
unsigned char ListLength;

ListLength = 0;
Y &= 0x1;
X &= 0xF; //限制X不能大於15，Y不能大於1
while (DData[ListLength]>0x20) //若到達字串尾則退出
{
if (X <= 0xF) //X坐標應小於0xF
{
DisplayOneChar(X, Y, DData[ListLength]); //顯示單個字符
ListLength++;
X++;
}
}
}

//5ms延時
void Delay5Ms(void)
{
unsigned int TempCyc = 5552;
while(TempCyc–);
}

//400ms延時
void Delay400Ms(void)
{
unsigned char TempCycA = 5;
unsigned int TempCycB;
while(TempCycA–)
{
TempCycB=7269;
while(TempCycB–);
};