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#include <reg52.h>
#include <intrins.h>
#define uint unsigned int
#define uchar unsigned char
#define NOP() _nop_()
#define Delay5us() {_nop_();_nop_();_nop_();_nop_();_nop_();}
#define LCD_LINE_ONE 1
#define LCD_LINE_TWO 2
sbit LCD_RS = P2^0 ;
sbit LCD_RW = P2^1 ;
sbit LCD_EN = P2^2 ;
sbit SCL = P1^1;
sbit SDA = P1^2;
sbit BEEP = P1^0;
uchar temp = 40;
uchar pres = 40;
uint Voltage[]={'0','0','0'}; //AD的LCD顯示值
unsigned char LCD_Line_1[] = {"TEMP: "};//TEMP-是溫度值
unsigned char LCD_Line_2[] = {"PRES: "};//PRES-是壓力值
extern void Convert_To_Voltage(uint val); //函數(shù)聲明
uchar IIC_ERROR; //IIC錯(cuò)誤標(biāo)志
void Delay(uint ms) //延時(shí)函數(shù)
{
uchar i;
while(ms--)
{
for(i=0;i<120;i++);
}
}
bit LCD_Busy_Check() //檢測(cè)忙信號(hào)
{
bit Result;
LCD_RS = 0;
LCD_RW = 1;
LCD_EN = 1;
Delay5us();
Result = (bit)(P0&0x80);
LCD_EN = 0;
return Result;
}
void LCD_Write_Command(uchar cmd)//LCD寫命令
{
while(LCD_Busy_Check());
LCD_RS = 0;
LCD_RW = 0;
LCD_EN = 0;
_nop_();
_nop_();
P0 = cmd;
Delay5us();
LCD_EN = 1;
Delay5us();
LCD_EN = 0;
}
void LCD_Write_Data(uchar dat)//LCD寫數(shù)據(jù)
{
while(LCD_Busy_Check());
LCD_RS = 1;
LCD_RW = 0;
LCD_EN = 0;
P0 = dat;
Delay5us();
LCD_EN = 1;
Delay5us();
LCD_EN = 0;
}
void LCD_Set_Position(uchar pos) //LCD顯示位置設(shè)置
{
if(pos == LCD_LINE_ONE)
LCD_Write_Command(0x80);
else
LCD_Write_Command(0xc0);
}
void LCD_Display_A_Line(uchar Line_Addr,uchar s[])//LCD顯示行
{
uchar i;
LCD_Set_Position(Line_Addr);
for(i=0;i<16;i++)
{
LCD_Write_Data(s[i]);
}
}
void LCD_Dispay(void) //LCD實(shí)時(shí)顯示
{
Convert_To_Voltage(temp*5);
LCD_Line_1[6]= Voltage[2];
LCD_Line_1[7]= Voltage[1];
LCD_Line_1[8]= '.';
LCD_Line_1[9]= Voltage[0];
LCD_Line_1[11]= 'C';
LCD_Line_1[12]= 'e';
LCD_Line_1[13]= 'n';
LCD_Line_1[14]= 't';
LCD_Display_A_Line(LCD_LINE_ONE,LCD_Line_1);//溫度顯示
Convert_To_Voltage(pres);
LCD_Line_2[6]= Voltage[2]+6;
LCD_Line_2[7]= '.';
LCD_Line_2[8]= Voltage[1];
LCD_Line_2[9]= Voltage[0];
LCD_Line_2[11]= 'p';
LCD_Line_2[12]= 'a';
LCD_Display_A_Line(LCD_LINE_TWO,LCD_Line_2);//壓力顯示
}
void LCD_Initialise() //LCD初始化
{
LCD_Write_Command(0x38);Delay(5);
LCD_Write_Command(0x0c);Delay(5);
LCD_Write_Command(0x06);Delay(5);
LCD_Write_Command(0x01);Delay(5);
LCD_Display_A_Line(1,LCD_Line_1);
LCD_Display_A_Line(2,LCD_Line_2);
}
/********************************PCF8591部分************************************/
void Convert_To_Voltage(uint val)//電壓換算成溫度或壓力
{
uint Tmp;
Tmp = val;
Voltage[2] = Tmp/100+'0';
Tmp = Tmp%100*10;
Voltage[1] = Tmp/100+'0';
Tmp = Tmp%100*10;
Voltage[0] = Tmp/100+'0';
}
/*****************IIC初始化*****************/
void delay()
{;;}
void start()//停止
{
SDA=1;
delay();
SCL=1;
delay();
SDA=0;
delay();
}
void stop() //啟動(dòng)
{
SDA=0;
delay();
SCL=1;
delay();
SDA=1;
delay();
}
void respons()//應(yīng)答信號(hào)
{
uchar i;
SCL=1;
delay();
while((SDA==1)&&(i<250))
i++;
SCL=0;
delay();
}
void init() //初始化PCF8591接口
{
SDA=1;
delay();
SCL=1;
delay();
}
uchar read_byte()//對(duì)PCF8591讀一個(gè)字節(jié)數(shù)據(jù)
{
uchar i,k;
SCL=0;
delay();
SDA=1;
delay();
for(i=0;i<8;i++)
{
SCL=1;
delay();
k=(k<<1)|SDA;
SCL=0;
delay();
}
return k;
}
void write_byte(uchar date) //對(duì)PCF8591寫一個(gè)字節(jié)數(shù)據(jù)
{
uchar i,temp1;
temp1=date;
for(i=0;i<8;i++)
{
temp1=temp1<<1;
SCL=0;
delay();
SDA=CY;
delay();
SCL=1;
delay();
}
SCL=0;
delay();
SDA=1;
delay();
}
void write_add(uchar control,uchar date)//輸出電壓
{
start();
write_byte(0x90);
respons();
write_byte(control);
respons();
write_byte(date);
respons();
stop();
}
uchar read_add(uchar control)//讀取AD轉(zhuǎn)換值
{
uchar date;
start();
write_byte(0x90);
respons();
write_byte(control);
respons();
start();
write_byte(0x90+1);
respons();
date=read_byte();
stop();
return date;
}
void main()
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