lcd-1602.c

驱动ADUC845进行AD采样

//*************LCD-1602**************
#include "ADUC845.H"

#define uchar unsigned char
#define uint  unsigned int

sbit LCM_RW=P2^6; //定义引脚
sbit LCM_RS=P2^7;
sbit LCM_E=P2^5;
#define LCM_Data P0

#define Busy 0x80 //用于检测LCM状态字中的Busy标识 

void WriteDataLCM(uchar WDLCM);
void WriteCommandLCM(uchar WCLCM,BuysC);
uchar ReadDataLCM(void);
uchar ReadStatusLCM(void);
void LCMInit(void);
void DisplayOneChar(uchar X, uchar Y, uchar DData);
void DisplayListChar(uchar X, uchar Y, uchar *DData);
void Delay40Ms(void);//其实大了点,1602LCD  5ms就够了
void Delay400Ms(void);

uchar data ddata[]={"4G Group-SCNU"};
uchar code ccode[] = {"temp="};

//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 *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 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
Delay40Ms(); 
WriteCommandLCM(0x38,0);//内部总线4位宽度，双行显示，5*7点阵
Delay40Ms(); 
WriteCommandLCM(0x38,0);
Delay40Ms(); 

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，DDRAM内容不变
WriteCommandLCM(0x06,1); // 显示光标移动设置
WriteCommandLCM(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--);
};
}