#include<intrins.h>
#include<STC12C5408AD.h> 
#define nop() _nop_()
#define uchar unsigned char
#define uint unsigned int

/*程序中变量数组定义*/
uchar idata table[]={" Real-time Temp:"};//第一行显示"Real-time Temp:"
uchar idata table1[7];
uint data1,kp,ki,kd;		
uint t,hightime,count;	 //占空比调节参数
uint rltemp,settemp=512; //50度512 75度768	 5v输入为1024
int e1,e2,e3,uk;
int duk;

/*引脚定义*/
sbit ADIN=P1^7;
sbit key50=P3^3;
sbit key75=P3^4;
sbit lcdrs=P3^7;
sbit lcdrw=P1^0;
sbit lcden=P1^1;
sbit pwm=P3^5;
/****************************** 
         延时子程序
*******************************/
void delay(uint z)
{		   
	uint x,y;
	for(x=z;x>0;x--)
	for(y=29;y>0;y--);
}
//延时31*z us
/****************************** 
         LCD忙检测
*******************************/
bit lcd_busy()
{
	bit result;
	lcdrw = 1;
	lcdrs = 0;
	lcden = 1;
	nop();nop();nop();nop();
	result = (bit)(P0&0x80);
	lcden = 0;
	return(result);
}

/****************************** 
      LCD写命令子程序
*******************************/
void write_com(uchar com)
{
    while(lcd_busy());//忙等待
	lcdrs = 0;
	lcdrw = 0;
	P2 = com;
	delay(5);
	lcden = 1;
	delay(5);
	lcden = 0;
}

/****************************** 
      LCD写数据子程序
*******************************/
void write_data(uchar date)
{
    while(lcd_busy()); //忙等待
	lcdrs = 1;
	lcdrw = 0;
	P2=date;
	delay(5);
	lcden = 1;
	delay(5);
	lcden = 0;
}

/****************************** 
         LCD初始化
*******************************/
void lcd_init()
{
	lcden = 0;
	write_com(0x38);
	delay(5);
	write_com(0x0c);
	delay(5);
	write_com(0x06);
	delay(5);
	write_com(0x01);
	delay(5);
	write_com(0x80);
	delay(5);
	write_com(0x01);
} 

/***************************
         AD转换函数
***************************/
unsigned int ADC_Conversion()
{
unsigned int temp;
unsigned char temp1;
	ADC_CONTR=0x87;
	delay(32);//延时1ms
	//通道P1^7，设定转换时间840*1.085us=911.4us
	ADC_CONTR=0x8f;
	//启动转换
	delay(50);
	ADC_CONTR=0x87;
	delay(32);
	temp=ADC_DATA;
	temp1=ADC_LOW2;
	temp1=temp1&0x03;
	temp=temp*4+temp1;
return temp;
}

/****************************** 
        定时器初始化
*******************************/
void time_init()		
{
	EA = 1;
	ET0 = 1;
	ET1 = 1;
	TR0 = 1;
	TR1 = 1;
	TMOD = 0x11;
    TH0 = 0X9E;
    TL0 = 0X58;
	TH1 = 0XFF;
	TL1 = 0XB0;	
}
/*两个定时器均为方式1
timer0温度采集定时中断11.0592 xtal 0.025s
timer1PWM波输出的定时中断 11.0592 xtal 0.05s
*/
/****************************** 
     PID算法系数装载
*******************************/
void Pid_init()
{
	hightime= 0;
	e1 = 0;
	e2 = 0;
	e3 = 0;
	kp = 10;
	ki = 3;
	kd = 1;	
	duk = 0;
}

/****************************** 
     温度比较  PID算法
*******************************/
void pid_ys()
{
	if(rltemp<settemp)	 //	如果实际温度小于设定值
	{
		if((settemp-rltemp)>20) // 如果相差2度
		{
			hightime=100;		//全速加热
		}
		else				   //否则运行PID算法进行平滑加热
		{					   
			e1 = settemp-rltemp;
			duk=(kp*(e1-e2)+ki*e1+kd*(e1-e2*2+e3))/44;
			uk = uk+duk;
//			uk=50;
			if(uk>100)
			{
			uk = 100;
			}
			else if(uk<-100)
			{
			uk = -100;
			}
			if(uk<0)
			{
				hightime=-uk;
			}
			else
			{
				hightime=uk;
			}
			e3 = e2;
			e2 = e1;	
		}
	}
	if(rltemp>=settemp)	//	如果实际温度不小于设定值
	{
		if((rltemp-settemp)>0)  //只要实际温度大于设定值
		{
			hightime=0;        //停止加热                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           ;		  //????
		}
		else				  //其他情况运行PID算法，但参数与前面的刚好相反
		{
			e1 = rltemp-settemp;
			duk=(kp*(e1-e2)+ki*e1+kd*(e1-e2*2+e3))/44;
			uk = uk+duk;
			if(uk>100)
			uk = 100;
			else if(uk<-100)
			uk = -100;
			if(uk<0)
			{
				hightime=100-(-uk);
			}
			else
			{
				hightime=100-uk;
			}
			e3 = e2;
			e2 = e1;	
		}
	}
	
}

/****************************** 
           主函数
*******************************/
void main()
{
    uint i;
	P1M0=0x80;
	P1M1=0x00;
	lcd_init();	// LCD初始化
	Pid_init();	//PID参数初始化
	time_init();//定时器初始化
	table1[6]=0x43;	
	table1[5]=0xdf;
	table1[3]=0x2e;	
    for(i=0;i<16;i++) 
    {				
		write_data(table[i]);
		delay(20);
	}
	while(1)
	{
	    t=(unsigned long)data1*500/512;
		table1[4]=t%10+0x30;	
		table1[2]=(t/10)%10+0x30;
		table1[1]=(t/100)%10+0x30;
		table1[0]=(t/1000)%10+0x30;
		rltemp =data1;	      //给PID算法装载实际值
	    write_com(0x80+0x45); //写LCD第二行的初地址
		for(i=0;i<7;i++) //该循环显示温度值
		{
			write_data(table1[i]);
			delay(20);
		}
		if (key50==0) {
			delay(100);//延时3ms
			if (key50==0) 
				settemp=512;

		}
		if (key75==0) {
			delay(100);
			if (key75==0)
				settemp=768;
		}	
		pid_ys();//运行温度比较PID算法
		

	}
}

/****************************** 
  温度采集转换的定时中断
     0.5s刷新一次数据
*******************************/
void  timer0() interrupt 1
{
    uint j;
	j++;
	if(j==20)
	{
		data1=ADC_Conversion();
		j=0;
    }
    TH0=0x9E;
    TL0=0X58;
}	

/****************************** 
     PWM波输出的定时中断
*******************************/
void  timer1() interrupt 3
{ 
	if(++count<=(hightime)) 
		pwm=0; 
	else if(count<=100) 
	{ 
		pwm=1; 
	} 
	else 
		count=0; 
	TH1=0xFF; 
	TL1=0xB0; 
} 
//pwm=0加热