第七届省赛程序设计题--模拟风扇控制系统蓝桥杯真题—04

Posted 2022-11-25 谏书稀

#include <STC15F2K60S2.H>
#include <intrins.h>
#include <onewire.h>
sbit s7=P3^0;
sbit s6=P3^1;
sbit s5=P3^2;
sbit s4=P3^3;

unsigned char table[]=0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0xbf,0x7f;
unsigned char mode=1; //睡眠风 1，自然风 2，常风 3。
unsigned int count=0;//定时1S的计数标志
unsigned char time=60;//定时时长，默认1分钟
unsigned char pwm_count=0;//脉宽调制的计数变量
unsigned char pwm_t=2;//具体的脉宽调制值，2表示占空比20%，3表示占空比30%，7表示占空比70%，
unsigned char pwm_f=1;//PWM输出的标志变量
unsigned char temp=0;//存放温度值
unsigned char flag_s7=0;//按下 S7，通过数码管显示当前室温
unsigned char flag_s6=1;//S6按键的标志位，默认为1

/*======================================================================================
数码管延时函数，寄存器选择函数，显示函数
======================================================================================*/
void delay(unsigned int t)

	while(t--);

void delay_ms(int n)

	int i,j;
	for(i=n;i>0;i--)
		for(j=110;j>0;j--);

void selectHC(unsigned char choose)

	switch(choose)
	
		case 4: P2 = (P2&0x1f) | 0x80; break; //LED灯
		case 5: P2 = (P2&0X1f) | 0xa0; break; //蜂鸣器，继电器
		case 6: P2 = (P2&0x1f) | 0xc0; break; //数码管位选
		case 7: P2 = (P2&0X1f) | 0xe0; break; //数码管段选
		case 0: P2 = (P2&0X1f) | 0x00; break;
	

void show(unsigned char w,unsigned char n)

	selectHC(7);
	P0 = 0xff;
	selectHC(6);
	P0 = 0x01 << w ;
	selectHC(7);
	P0 = n;
	delay_ms(1);
	selectHC(0);

void show_all(unsigned char dat)

	selectHC(6);
	P0=0xff;
	selectHC(7);
	P0=dat;
	selectHC(0);

/*======================================================================================
温度读取函数
======================================================================================*/
void read_temp()

	unsigned char LSB; //温度的低八位
	unsigned char MSB; //温度的高八位

	Init_DS18B20();
	Write_DS18B20(0xcc);
	Write_DS18B20(0x44);
	delay_ms(1);

	Init_DS18B20();
	Write_DS18B20(0xcc);
	Write_DS18B20(0xbe);
	LSB=Read_DS18B20();
	MSB=Read_DS18B20();
	Init_DS18B20();

	temp=MSB;
	temp=(MSB<<8)|LSB;
	temp=temp>>4; //移除小数部分


/*======================================================================================
定时器0函数  定时1S  PWM输出
======================================================================================*/
void Init_timer0()

	TMOD=0x01;
	TH0=(65536-100)/256;//定时100us	
	TL0=(65536-100)%256;
	TR0=1;
	ET0=1;
	EA=1;	

void service_timer0() interrupt 1

	TH0=(65536-100)/256;//定时100us	
	TL0=(65536-100)%256;
	if(time>0)
	
		count++;
		if(count>=10000)	//10000*100us=1s,满1秒了 time减一秒
		
			time=time-1;
			count=0;	
		
	
	/*
	* 频率1KHz，周期T=1ms，计时100us，则pwm_count加1
	* 如果pwm_count大于等于2了，说明计数了200us，即0.2ms，则实现了占空比20%，以此类推
	*/
	pwm_count=pwm_count+1; 
	if(pwm_count>=pwm_t)
	
		pwm_f=0;
	
	if(pwm_count>=10) //计数了10个100us，则表示一个周期完了3
	
		pwm_count=0;
		pwm_f=1;
	


/*======================================================================================
数码管显示   s7按下即flag_s7=0显示温度，否则显示模式和时间
======================================================================================*/
void show_mode_temp()

	if(flag_s7==0)
	
		show(0,table[10]);
		show(1,table[mode]);
		show(2,table[10]);
		show(3,0xff);
		show(4,table[time/1000]);
		show(5,table[time/100%10]);
		show(6,table[time/10%10]);
		show(7,table[time%10]);
	
	if(flag_s7==1)
	
		show(0,table[10]);
		show(1,table[4]);
		show(2,table[10]);
		show(3,0xff);
		show(4,0xff);
		show(5,table[(temp/10)%10]);
		show(6,table[temp%10]);
		show(7,0xc6);
	


/*======================================================================================
PWM蜂鸣器输出   LED灯显示
======================================================================================*/
void buzz ()

	selectHC(0);
	if (pwm_f == 1)
	
		P0 = 0x40;	
	
	else if (pwm_f == 0)
	
		P0 = 0x00;	
	
	selectHC(5);


void led()

	selectHC(0);
	if(time>0)
	
		if(mode==1)
		
			P0=0xfe;
		
		else if(mode==2)
		
			P0=0xfd;
		
		else if(mode==3)
		
			P0=0xfb;
		
	else if(time==0|flag_s6==0)
	
		P0=0xff;
	
	selectHC(4);

/*======================================================================================
按键开关扫描函数
======================================================================================*/
void keys()

	if(s7==0)
	
		delay_ms(1);
		if(s7==0)
		
			while(s7==0)
			
				show_mode_temp();
				if(time>0)
				
					buzz();
				
				else if(time==0)
				
				 	selectHC(5);
					P0=0X00;
				
			
			if(flag_s7==0)
			
				flag_s7=1;
			
			else if(flag_s7==1)
			
				flag_s7=0;
			
		
	
	
	if(s6==0)
	
		delay_ms(1);
		if(s6==0)
		
			while(s6==0)
			
				show_mode_temp();
				if(time>0)
				
					buzz();
				
				else if(time==0)
				
				 	selectHC(5);
					P0=0X00;
					
			
			time=0;
		
	
	
	if(s5==0)
	
		delay_ms(1);
		if(s5==0)
		
			while(s5==0)
			
				show_mode_temp();
				if(time>0)
				
					buzz();
				
				else if(time==0)
				
				 	selectHC(5);
				
			
			if(flag_s6==1)
			
				flag_s6=2;
				time=120;
			
			else if(flag_s6==2)
			
				flag_s6=0;
				time=0;
			
			else if(flag_s6==0)
			
				flag_s6=1;
				time=60;
			
		
	
	
	if(s4==0)
	
		delay_ms(1);
		if(s4==0)
		
			while(s4==0)
			
				show_mode_temp();
				if(time>0)
				
					buzz();
				
				else if(time==0)
				
				 	selectHC(5);
					P0=0X00;
				
		    
			if(mode==1) //睡眠风 占空比20%
			
				mode=2;
				pwm_t=5;
			
			else if(mode==2) //自然风 占空比30%
			
				mode=3;
				pwm_t=10;
			
			else if(mode==3) //常风 占空比70%
			
				mode=1;
				pwm_t=2;
					
		
						


void main()

	selectHC(4); P0 = 0xff;
	selectHC(5); P0 = 0x00;
	selectHC(0);
    Init_timer0();
	while(1)
	
		keys();
		if(flag_s7==1)
		
			read_temp();
		
		show_mode_temp();
		if(time>0)
		
			buzz();
		
		else if(time==0)
		
			selectHC(0);
			P0=0X00;
			selectHC(5);
		
		led();