lcd1602.c

LCD1602底层驱动,C语言编写

#include "reg52.h" 
#include "lcd1602.h"


//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
WriteCommandLCD(X, 0); //这里不检测忙信号，发送地址码
WriteDataLCD(DData);
}

//按指定位置显示一串字符
void DisplayListChar(unsigned char X, unsigned char Y, unsigned char *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++;
	 	}
	}
}

//写数据
void WriteDataLCD(unsigned char WDLCD)
{
ReadStatusLCD(); //检测忙
LCDData = WDLCD;
LCD_RS = 1;
LCD_RW = 0;
LCD_E = 0; //若晶振速度太高可以在这后加小的延时
LCD_E = 0; //延时
LCD_E = 1;
}

//写指令
void WriteCommandLCD(unsigned char WCLCD,BuysC) //BuysC为0时忽略忙检测
{
if (BuysC) ReadStatusLCD(); //根据需要检测忙
LCDData = WCLCD;
LCD_RS = 0;
LCD_RW = 0; 
LCD_E = 0;
LCD_E = 0;
LCD_E = 1; 
}

//读数据
unsigned char ReadDataLCD(void)
{
LCD_RS= 1; 
LCD_RW= 1;
LCD_E = 0;
LCD_E = 0;
LCD_E = 1;
return(LCDData);
}

//读状态
unsigned char ReadStatusLCD(void)
{
LCDData = 0xFF; 
LCD_RS= 0;
LCD_RW= 1;
LCD_E = 0;
LCD_E = 0;
LCD_E = 1;
while (LCDData & LCDBusy); //检测忙信号
return(LCDData);
}

void LCDInit(void) //LCD初始化
{
LCDData = 0;
WriteCommandLCD(0x38,0); //三次显示模式设置，不检测忙信号
Delay40Ms(); 
WriteCommandLCD(0x38,0);//内部总线4位宽度，双行显示，5*7点阵
Delay40Ms(); 
WriteCommandLCD(0x38,0);
Delay40Ms(); 

WriteCommandLCD(0x38,1); //显示模式设置,开始要求每次检测忙信号
WriteCommandLCD(0x08,1); //关闭显示
WriteCommandLCD(0x01,1); //显示清屏，DDRAM内容不变
WriteCommandLCD(0x06,1); // 显示光标移动设置
WriteCommandLCD(0x0C,1); // 显示开及光标设置
}

//40ms延时
void Delay40Ms(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--);
};
}