lcd1602.c

基于89S52的电子时钟

#include "main.h"
sbit LCM_RW = P2^1 ;//定义引脚 
sbit LCM_RS = P2^0 ;
sbit  LCM_E  = P2^2 ;
#define LCM_Data  P0 //定义液晶数据口
#define Busy    0x80 //用于检测LCM状态字中的Busy标识 
#include "1602.h"


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); 

//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--); 
 }; 
} 
*/


void LCD_printc(unsigned char lcd_data)          //输出一个字符到LCD
{
 WriteDataLCM(lcd_data);
}

void LCD_prints(unsigned char *lcd_string)       //输出一个字符串到LCD
{
 unsigned char i=0;
 while(lcd_string[i]!=0x00)
  {
   WriteDataLCM(lcd_string[i]);
   i++;
  } 
}






/*
如果上述代码不能初始化1602液晶，则尝试以下代码，我发现目前1602至少有两种驱动，以下代码基于SED1520驱动
#include "main.h"
#define LCD_DATA  P0        //LCD的数据口

sbit LCD_BUSY=LCD_DATA^7;  //LCD忙信号位

sbit LCD_RW=P1^2;          //LCD读写控制
sbit LCD_RS=P1^3;          //LCD寄存器选择
sbit LCD_EN=P1^1;          //LCD使能信号

#include "1602.h"

void LCD_check_busy(void)   //检测LCD状态，看它是不是还在忙呢
{
 while(1)
  {
   LCD_EN=0;
   LCD_RS=0;
   LCD_RW=1;
   LCD_DATA=0xff;
   LCD_EN=1;
   if(!LCD_BUSY)break;
  }
 LCD_EN=0;
}

void LCD_cls(void)          //LCD清屏
{
 ET2=0;
 LCD_check_busy();
 LCD_RS=0;
 LCD_RW=0;
 LCD_EN=1;
 LCD_DATA=1;
 LCD_EN=0;
 ET2=1;
}

void LCD_write_instruction(unsigned char LCD_instruction)   //写指令到LCD
{
 ET2=0;
 LCD_check_busy();
 LCD_RS=0;
 LCD_RW=0;
 LCD_EN=1;
 LCD_DATA=LCD_instruction;
 LCD_EN=0;
 ET2=1;
}

void LCD_write_data(unsigned char LCD_data)      //输出一个字节数据到LCD
{
 ET2=0;
 LCD_check_busy();
 LCD_RS=1;
 LCD_RW=0;
 LCD_EN=1;
 LCD_DATA=LCD_data;
 LCD_EN=0;
 ET2=1;
}
 
void LCD_set_position(unsigned char x)            //LCD光标定位到x处
{
 LCD_write_instruction(0x80+x);
}

/*
void LCD_go_home(void)                         //LCD光标归位
{
 LCD_write_instruction(LCD_GO_HOME);
}
*/
/*
void LCD_printc(unsigned char lcd_data)          //输出一个字符到LCD
{
 LCD_write_data(lcd_data);
}

void LCD_prints(unsigned char *lcd_string)       //输出一个字符串到LCD
{
 unsigned char i=0;
 while(lcd_string[i]!=0x00)
  {
   LCD_write_data(lcd_string[i]);
   i++;
  } 
}

void LCD_initial(void)                        //初始化LCD
{ 
LCD_write_instruction(0x38);delayXms(100); 
LCD_write_instruction(0x38);delayXms(100); 
LCD_write_instruction(0x38);delayXms(100); 
LCD_write_instruction(0x08);delayXms(100); 
LCD_write_instruction(0x01);delayXms(100); 
LCD_write_instruction(0x06);delayXms(100); 
LCD_write_instruction(0x0c);delayXms(100); 
 //LCD_write_instruction(LCD_AC_AUTO_INCREMENT|LCD_MOVE_DISENABLE);
 //LCD_write_instruction(LCD_DISPLAY_ON|LCD_CURSOR_OFF);

 LCD_cls();
LCD_write_instruction(0x90);
 LCD_prints("our timer");
}*/