#include <reg52.h>
//1602顯示模塊 四位數據線P1高四位 用sprintf顯示浮點變量過于占用資源           
#include <string.h>
#include "stdio.h"

/********************************************************************/
#define  LCM_Data       P1

sbit LCM_RS=P2^0;   

sbit LCM_RW=P2^1;   

sbit LCM_E=P2^2;

sbit P1_7=P1^7;

char buffer[10];//浮點變量顯示

//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--); 
}; 
}

//讀狀態 
unsigned char ReadStatusLCM(void) 
{ 
P1_7=1; 
LCM_RS = 0; 
LCM_RW = 1; 
LCM_E = 0; 
LCM_E = 0; 
LCM_E = 1; 
while(P1_7&0x01);//檢測忙信號 
return(P1_7); 
} 
 

void writelcd(bit command,unsigned char ddata) 
{ 
ReadStatusLCM(); //檢測忙 
LCM_Data = (ddata&0xf0)|(P1&0x0f); 
LCM_RW = 0; 
if(command==0) LCM_RS = 0; else LCM_RS=1; 
LCM_E = 1; 
LCM_E = 0; 
LCM_E = 0; 
LCM_Data = ((ddata<<4)&0xf0)|(P1&0x0f); 
if(command==0) LCM_RS = 0; else LCM_RS=1; 
LCM_E = 1; 
LCM_E = 0; 
LCM_E = 0; 
} 


void LCMInit(void) //LCM初始化 
{ 
//LCM_Data=0xff; 
writelcd(0,0x01); //顯示清屏 
writelcd(0,0x28); //三次顯示模式設置，不檢測忙信號 
Delay5Ms(); 
writelcd(0,0x28); 
Delay5Ms(); 
writelcd(0,0x28); 
Delay5Ms(); 
writelcd(0,0x28); //顯示模式設置,開始要求每次檢測忙信號 
writelcd(0,0x0c); // 顯示開及光標設置 
writelcd(0,0x01); //顯示清屏 

writelcd(0,0x06); // 顯示光標移動設置 
} 

//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不能大于15，Y不能大于1 
if (Y) X |= 0x40; //當要顯示第二行時地址碼+0x40; 
X |= 0x80; //算出指令碼 
writelcd(0,X); 
//Delay5Ms(); //////////////////////////
writelcd(1,DData); 

} 

//按指定位置顯示一串字符 ***原來的遇到空格0x20就不顯示*** 
void DisplayListChar(unsigned char X, unsigned char Y, unsigned char  *DData) //原來unsigned char code DData
{ 
unsigned char ListLength,j,buchong; 
ListLength = strlen(DData); 
Y &= 0x1; 
X &= 0xF; //限制X不能大于15，Y不能