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#include "reg52.h"
#include <intrins.h>
//LCD1602接口定義
#define LCD_DATA P1 //P1口(P14~P17)與LCD高四位(D4~D7)對應(yīng)相接
sbit LCD1602_RS=P1^2; //數(shù)據(jù)指令
sbit LCD1602_EN=P1^3; //使能
//延時(shí)函數(shù),12mhz 6t延遲時(shí)間10*255us
void LCD_init(void);
void LCD_en_write(void);
void LCD_write_command(unsigned char command) ;
void LCD_write_data(unsigned char Recdata);
void LCD_set_xy (unsigned char x, unsigned char y);
void LCD_write_string(unsigned char X,unsigned char Y,unsigned char *s);
void LCD_write_char(unsigned char X,unsigned char Y,unsigned char Recdata);
void delay_nus(unsigned int n);
void delay_nms(unsigned int n);
//以下函數(shù)用于輸出字符串和數(shù)字
int LCD_PutNum(unsigned long num,int XS,int pos);
int LCD_PutStr(unsigned char *DData,int pos);
//-------------------------1us延時(shí)函數(shù)---------------------------------
void delay_1us(void)
{
_nop_();
}
//------------------------N us延時(shí)函數(shù)---------------------------------
void delay_nus(unsigned int n)
{
unsigned int i=0;
for (i=0;i<n;i++)
delay_1us();
}
//-----------------------1ms延時(shí)函數(shù)----------------------------------
void delay_1ms(void)
{
unsigned int i;
for (i=0;i<1140;i++);
}
//-----------------------N ms延時(shí)函數(shù)---------------------------------
void delay_nms(unsigned int n)
{
unsigned int i=0;
for (i=0;i<n;i++)
delay_1ms();
}
//------------------------液晶初始化-----------------------------------
void LCD_init(void)
{
LCD_write_command(0x28);
delay_nus(40);
LCD_write_command(0x28);
delay_nus(40);
LCD_write_command(0x28);
delay_nus(40);
LCD_en_write();
delay_nus(40);
LCD_write_command(0x28); //4位顯示
LCD_write_command(0x0c); //顯示開
LCD_write_command(0x01); //清屏
delay_nms(2);
}
//----------------------液晶使能函數(shù)-------------------------------------
void LCD_en_write(void)
{ //EN由高電平跳變到低電平時(shí)液晶使能
LCD1602_EN=1;
delay_nus(1);
LCD1602_EN=0;
}
//------------------------寫指令函數(shù)--------------------------------------
void LCD_write_command(unsigned char command)
{
delay_nus(16);
LCD1602_RS=0; //RS=0
LCD_DATA &=0X0f; //清高四位
LCD_DATA|=command&0xf0; //寫高四位
LCD_en_write();
command=command<<4; //低四位移到高四位
LCD_DATA&=0x0f; //清高四位
LCD_DATA|=command&0xf0; //寫低四位
LCD_en_write();
}
//------------------------寫數(shù)據(jù)函數(shù)--------------------------------------
void LCD_write_data(unsigned char Recdata)
{
delay_nus(16);
LCD1602_RS=1; //RS=1
LCD_DATA&=0X0f; //清高四位
LCD_DATA|=Recdata&0xf0; //寫高四位
LCD_en_write();
Recdata=Recdata<<4; //低四位移到高四位
LCD_DATA&=0X0f; //清高四位
LCD_DATA|=Recdata&0xf0; //寫低四位
LCD_en_write();
}
//-----------------------地址定位函數(shù)-------------------------------------
void LCD_set_xy( unsigned char x, unsigned char y )
{
unsigned char address;
if (y == 0) address = 0x80 + x;
else address = 0xc0 + x;
LCD_write_command(address);
}
//----------------------在某個(gè)地址處，寫一個(gè)字符----------------------------
void LCD_write_char(unsigned char X,unsigned char Y,unsigned char Recdata) //列x=0~15,行y=0,1
{
LCD_set_xy(X, Y); //寫地址
LCD_write_data(Recdata);
}
//----------------------------輸出字符串-------------------------------------
int LCD_PutStr(unsigned char *DData,int pos) //pos表示字符顯示位置，0~31
{
unsigned char i;
if(pos==-1)
{
LCD_write_command(0x01); //清屏
delay_nms(2);
pos=0;
}
while((*DData)!='\0')
{
switch(*DData)
{
case '\n': //如果是\n，則換行
{
if(pos<17)
{
for(i=pos;i<16;i++) LCD_write_char(i%16, i/16,' ');
pos=16;
}
else
{
for(i=pos;i<32;i++) LCD_write_char(i%16, i/16,' ');
pos=0;
}
break;
}
case '\b': //如果是\b，則退格
{
if(pos>0) pos--;
LCD_write_char(pos%16, pos/16, ' ');
break;
}
default:
{
if((*DData)<0x20) //小于0x20的顯示不了？
{
*DData=' ';
}
LCD_write_char(pos%16, pos/16,*DData);
pos++;
break;
}
}
DData++;
}
return(pos);
}
//----------------------------輸出數(shù)字---------------------------------
//這段程序?qū)懛ㄎ业睦斫獯笾率沁@樣：num為去掉小數(shù)點(diǎn)之后的數(shù)字，XS為小數(shù)點(diǎn)
//從左數(shù)第幾位，pos為顯示的位置
//---------------------------------------------------------------------
int LCD_PutNum(unsigned long num,int XS,int pos)
{
unsigned long tmp=0;
unsigned char numbits=0; //總數(shù)字位數(shù)
if(pos==-1)
{
LCD_write_command(0x01);
delay_nms(2);
pos=0;
}
if(num==0)
{
LCD_write_char(pos%16, pos/16, '0');
pos++;
}
else
{
if(num<0)
{
LCD_write_char(pos%16, pos/16, '-');
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