lcd1602.c

主要实现对时钟芯片isl12029的功能。 isl12029是intersil公司的一款RTC

#include <reg51.h> 
#include <intrins.h>
#include <absacc.h>

#define nop() _nop_()
#define LCM_Data P0 
#define Busy    0x80  //用于检测LCM状态字中的Busy标识
sbit LCM_RW=P1^1;     //定义LCD引脚
sbit LCM_RS=P1^0; 
sbit LCM_E=P1^2;
unsigned char code cdle_net[] = {"IIC_ISL12029RTC "};
/*unsigned char xdata *add;//这里定义是一定要注意数据类型，这里的类型是指地址里的内容的数据类型

unsigned char code lcdclr[] = {' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '};
unsigned char code table[]  = {0x08,0x0f,0x12,0x0f,0x0a,0x1f,0x02,0x02,
                               0x0f,0x09,0x0f,0x09,0x0f,0x09,0x11,0x00,	
							   0x0f,0x09,0x09,0x0f,0x09,0x09,0x0f,0x00	

							   ,0x04,0x07,0x04,0x07,0x05,0x0f,0x11,0x1f,							   
							   0x04,0x1c,0x04,0x1c,0x00,0x18,0x00,0x1f,
							   0x0a,0x1f,0x0a,0x0e,0x0a,0x1f,0x0a,0x12,
							   0x1e,0x12,0x1e,0x12,0x1e,0x12,0x12,0x12};*/

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

//400ms延时
void Delay200Ms(void)
{
	unsigned char TempCycA = 4;
	unsigned int TempCycB;
	while(TempCycA--)
		{
			TempCycB=5000;
			while(TempCycB--);
		};
}
//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);
}

//写数据
void WriteDataLCM(unsigned char WDLCM) 
{
	ReadStatusLCM(); //检测忙
	LCM_Data=WDLCM;
	LCM_RS=1;
	LCM_RW=0;
	LCM_E=0; //
	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;	
}

//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, 1); //发命令字
	WriteDataLCM(DData); //发数据
}

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++;
				}
		}
}

/*
void writecgram(unsigned char i,unsigned char *zwdata)
{ 
  unsigned char j;  
  WriteCommandLCM(0x40,1); //写LCM CGRAM的起始地址。
  for(j=0;j<i;j++)
      WriteDataLCM(*zwdata++);
}
*/
void lcdinit()
{  
   unsigned char i;
   Delay200Ms(); //启动等待，等LCM讲入工作状态
   LCMInit(); //LCM初始化
//   writecgram(24,&table[0]);
         
   DisplayListChar(0, 0,cdle_net);   //
   for(i=0;i<5;i++)     
       Delay200Ms();   
   for(i=0;i<16;i++)
       DisplayOneChar(i, 0,' ');            
}