蓝桥杯单片机省赛第七届（已验证没有任何问题）

最新推荐文章于 2025-02-02 23:42:29 发布

原创最新推荐文章于 2025-02-02 23:42:29 发布 · 667 阅读

4 ·

CC 4.0 BY-SA版权

文章标签：

#单片机 #蓝桥杯 #嵌入式硬件 #学习

该博客主要涉及单片机编程，使用DS18B20传感器读取温度，并通过七段数码管显示。同时，利用HC138译码器控制LED显示，实现了温度的实时监测和界面交互功能。程序中包含了错误修正，如位移操作和端口控制。

细节问题：

1.读取温度，MSB<<8，不是MSB<<4

2.HC138（4）打开控制LED的端口，不要写成HC138（0）

3.count最好是int型，不然可能不够计数

4.赋值是赋给P0，不是P2啊啊啊啊救命，竟然半小时才检查出来太丢人了

#include"reg52.h"
#include"onewire.h"

sbit S7=P3^0;
sbit S6=P3^1;
sbit S5=P3^2;
sbit S4=P3^3;

unsigned char code SMG_duanma[10]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};
unsigned char stat=0;
unsigned char mode=1;
unsigned char time=0;
unsigned char temp=0;
unsigned int count=0;
unsigned char pwm_f=0;
unsigned char pwm_c=0;
unsigned char pwm_t=0;
unsigned char k6=1;

void HC138(unsigned char channel)
{
	switch(channel)
	{
		case 4:P2=(P2&0x1f)|0x80;break;
		case 5:P2=(P2&0x1f)|0xa0;break;
		case 6:P2=(P2&0x1f)|0xc0;break;
		case 7:P2=(P2&0x1f)|0xe0;break;
		case 0:P2=(P2&0x1f)|0x00;break;
	}
		P2=(P2&0x1f)|0x00;
}

void SMG_bit(unsigned char pos,unsigned char dat)
{
	P0=(0x01<<pos);
	HC138(6);
	P0=dat;
	HC138(7);
}

void SMG_all(unsigned char dat)
{
	P0=0xff;
	HC138(6);
	P0=dat;
	HC138(7);
}

void SMG_delay(unsigned char q)
{
	while(q--);
}

void SMG_display()
{
	if(stat==0)
	{
		SMG_bit(0,0xbf);
		SMG_delay(200);	
		SMG_bit(0,0xff);
		SMG_delay(200);
		SMG_bit(1,SMG_duanma[mode]);
		SMG_delay(200);	
		SMG_bit(1,0xff);
		SMG_delay(200);
		SMG_bit(2,0xbf);
		SMG_delay(200);	
		SMG_bit(2,0xff);
		SMG_delay(200);
	
		SMG_bit(4,SMG_duanma[time/1000]);
		SMG_delay(200);	
		SMG_bit(4,0xff);
		SMG_delay(200);
		SMG_bit(5,SMG_duanma[(time/100)%10]);
		SMG_delay(200);	
		SMG_bit(5,0xff);
		SMG_delay(200);
		SMG_bit(6,SMG_duanma[(time/10)%10]);
		SMG_delay(200);	
		SMG_bit(6,0xff);
		SMG_delay(200);
		SMG_bit(7,SMG_duanma[time%10]);
		SMG_delay(200);	
		SMG_bit(7,0xff);
		SMG_delay(200);
	
		SMG_all(0xff);
		SMG_delay(200);
	}
		if(stat==1)
	{
		SMG_bit(0,0xbf);
		SMG_delay(200);	
		SMG_bit(0,0xff);
		SMG_delay(200);
		SMG_bit(1,SMG_duanma[4]);
		SMG_delay(200);	
		SMG_bit(1,0xff);
		SMG_delay(200);
		SMG_bit(2,0xbf);
		SMG_delay(200);	
		SMG_bit(2,0xff);
		SMG_delay(200);
	
		SMG_bit(5,SMG_duanma[temp/10]);
		SMG_delay(200);	
		SMG_bit(5,0xff);
		SMG_delay(200);
		SMG_bit(6,SMG_duanma[temp%10]);
		SMG_delay(200);	
		SMG_bit(6,0xff);
		SMG_delay(200);
		SMG_bit(7,0xc6);
		SMG_delay(200);	
		SMG_bit(7,0xff);
		SMG_delay(200);
	
		SMG_all(0xff);
		SMG_delay(200);
	}
}

void temp_delay(unsigned char f)
{
	while(f--);
}

void read_temp()
{
	unsigned char LSB;
	unsigned char MSB;
	unsigned int tem;

	init_ds18b20();
	Write_DS18B20(0xcc);
	Write_DS18B20(0x44);
	temp_delay(1000);
	init_ds18b20();
	Write_DS18B20(0xcc);
	Write_DS18B20(0xbe);
	
	LSB=Read_DS18B20();
	MSB=Read_DS18B20();

	temp=(MSB<<8)|LSB;
	if((tem&0xf8000)==0x0000)
	{
		temp=temp >>4;
	}
}

void InitTimer0()
{
	TMOD=0x01;
	TH0=(65535-100)/256;
	TL0=(65534-100)%256;
	
	EA=1;
	ET0=1;
	TR0=1;
}

void serviceTimer0() interrupt 1
{
	TH0=(65535-100)/256;
	TL0=(65534-100)%256;
	
	if(time>0)
	{
		count++;
		if(count>=10000)
		{
			time=time-1;
			count=0;
		}
	}
	
	pwm_c=pwm_c+1;
	if(pwm_c>=pwm_t)
	{
		pwm_f=0;
	}
	if(pwm_c>=10)
	{
		pwm_f=1;
		pwm_c=0;
	}
}

void delay(unsigned char s)
{
	while(s--);
}

void keyboard()
{
	if(S4==0)
	{
		delay(200);
		if(S4==0)
		{
			while(S4==0)
			{
				SMG_display();
			}
			if(mode==1)
			{
				mode=2;
				pwm_t=3;
			}
			else if(mode==2)
			{
				mode=3;
				pwm_t=7;
			}
			else if(mode==3)
			{
				mode=1;
				pwm_t=2;
			}
		}
	}
	if(S5==0)
	{
		delay(200);
		if(S5==0)
		{
			while(S5==0)
			{
				SMG_display();
			}
			if(k6==1)
			{
				k6=2;
				time=60;
			}
			else if(k6==2)
			{
				k6=0;
				time=120;
			}
			else if(k6==0)
			{
				k6=1;
				time=0;
			}
		}
	}
	if(S6==0)
	{
		delay(200);
		if(S6==0)
		{
			while(S6==0)
			{
				SMG_display();
			}
			time=0;
		}
	}
	if(S7==0)
	{
		delay(200);
		if(S7==0)
		{
			while(S7==0)
			{
				SMG_display();
			}
			if(stat==0)
			{
				stat=1;
			}
			else if(stat==1)
			{
				stat=0;
			}
		}
	}
}

void LEDRunning ()
{
	HC138(0);
	if (time > 0)
	{
		if (mode == 1)
		{
			P0 = 0xfe;
		}
		else if (mode == 2)
		{
			P0 = 0xfd;
		}
		else if (mode == 3)
		{
			P0 = 0xfb;
		}
	}
	else P0 = 0xff;
	HC138(4);		
}
			
void InitSystem()
{
	P0=0xff;
	HC138(4);
	P0=0x00;
	HC138(5);
	SMG_all(0xff);
}

void main()
{
	InitSystem();
	InitTimer0();
	while(1)
	{
		SMG_display();
		if(stat==1)
		{
			read_temp();
		}	
		LEDRunning ();
		keyboard();
	}
}