蓝桥杯单片机必备代码（零基础也适合）

Posted 2021-06-01 无乎648

1、选择不同接口代码，传参4是LED小灯接口，5是蜂鸣器继电器，6是数码管位置，7是数码管显示的数值

//选择接口
void SelectHC573(unsigned char n)
{
	switch(n)
	{
		case 4:
			P2=(P2&0x1f)|0x80;//LED
		break;
		case 5:
			P2=(P2&0x1f)|0xa0;//蜂鸣器
		break;
		case 6:
			P2=(P2&0x1f)|0xc0;//数码管位置
		break;
		case 7:
			P2=(P2&0x1f)|0xe0;//数码管数值
		break;
	}
}

2、最基础的流水灯函数

//流水灯
void LED(unsigned char channl)
{
	unsigned char i;
	SelectHC573(4);
	P0=0xff;
	if(channl)//右到左
	{
		for(i=0;i<8;++i)
		{
			P0>>=1;
			Delay(10000);
		}
		for(i=0;i<8;++i)
		{
			P0=~(~P0>>1);
			Delay(10000);
		}
	}
	else//左到右
	{
		for(i=0;i<8;++i)
		{
			P0<<=1;
			Delay(10000);
		}
		for(i=0;i<8;++i)
		{
			P0=~(~P0<<1);
			Delay(10000);
		}
	}
}

3、数码管

//数码管对应的值
unsigned char code LedChar[]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90,0x88,0x83,0xC6,0xA1,0x86,0x8E,0xBF};
//数码管显示
void DisplaySMG(unsigned char value,unsigned char pos)
{
	SelectHC573(6);
	P0=0x01<<pos;
	SelectHC573(7);
	P0=value;
}
//数码管的延迟
void DelaySMG(unsigned int t)
{
	while(t--)
	{
		ShowSMG(num);
	}
}
//数码管显示的数字
void ShowSMG(unsigned int n)
{
	signed char i;
	for(i=7;i>=0;--i)
	{
		DisplaySMG(LedChar[n%10],i);
		n/=10;
		Delay(500);
	}
}

4、关掉蜂鸣器

SelectHC573(5);	P0=0x00;

5、键盘初始化

sfr P4=0xc0;
sbit R1=P3^0;
sbit R2=P3^1;
sbit R3=P3^2;
sbit R4=P3^3;
sbit C4=P3^4;
sbit C3=P3^5;
sbit C2=P4^2;
sbit C1=P4^4;

void SetKey(unsigned char i)
{
	switch(i)
	{
		case 0:R1=0;R4=1;break;
		case 1:R2=0;R1=1;break;
		case 2:R3=0;R2=1;break;
		case 3:R4=0;R3=1;break;
	}
}
void ScanKey()
{
	unsigned char i;
	for(i=0;i<4;++i)
	{
		SetKey(i);
		if(C2==0)
		{
			while(C2==0)
			{
				ShowSMG(num);
			}
			if(i==3)
			{
				num=0;
				num1=0;
			}
			else
			{
				num*=10;
				num+=3*i+1;
			}
			
		}
		else if(C3==0)
		{
			while(C3==0)
			{
				ShowSMG(num);
			}
			
			if(i==3) 
			{
				num*=10;
			}
			else
			{
				num*=10;
				num+=3*i+2;
			}
		}
		else if(C4==0)
		{
			while(C4==0)
			{
				ShowSMG(num);
			}
			if(i==3)
			{
				count();
			}
			else
			{
				num*=10;
				num+=3*i+3;
			}
		}
		else if(C1==0)
		{
			
				while(C1==0)
				{
					ShowSMG(num);
				}
				num1=num;
				num=0;
				state=i;
		}
	}
}

6、定时器

void InitTimer0()
{
	TMOD=0x01;//选择T0
	TH0=(65535-50000)/256;
	TL0=(65535-50000)%256;
	ET0=1;
	EA=1;
	TR0=1;
}
void ServiceTimer0() interrupt 1//0外部中断 1是定时器0 2是外部中断1 3是定时器1 4是串口中断
{
	TH0=(65535-50000)/256;//50ms
	TL0=(65535-50000)%256;
}

7、串口

void InitUart()
{
	TMOD=0x20;
	TH1=0xfd;
	TL1=0xfd;
	TR1=1;
	
	SCON=0x50;
	AUXR=0x8e;
	ES=1;//串口
	EA=1;//中断器
}
//串口中断器
void SeviceUart() interrupt 4
{
	if(RI==1)
	{
		command=SBUF;
		RI=0;
	}
}
//发送单个字节
void SendByte(unsigned char dat)
{
	SBUF=dat;
	while(TI==0);
	TI=0;
}
//发送字符串
void SendString(unsigned char *str)
{
	while(*str!='\\0')
	{
			SendByte(*str++);
	}
}

//接受指令
void Working()
{
	if(command!=0x00)
	{
		switch(command&0xf0)
		{
			case 0xa0:
				P0=0xff;
				P0=(P0|0x0f)&(~command|0xf0);//µÍλ
				command=0x00;
				break;
			case 0xb0:
				P0=0xff;
				P0=(P0|0xf0)&(~command<<4|0x0f);//¸ßλ
				command=0x00;
			break;
			case 0xc0:
				SendString("欢迎来到我的单片机");
				command=0x00;
			break;
		}
	}
}

8、pwm应用

#include<reg52.h>
#include<absacc.h>
sbit S4=P3^3;
sbit S7=P3^0;
unsigned char pwm=0;
unsigned char count=0;
unsigned char pwm_duty=0;
unsigned char stat_go=0;
unsigned char stat=0;
unsigned char led_go=0;
unsigned char key_puse=0;
unsigned char times=0;
unsigned char code LedChar[]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,
0xF8,0x80,0x90,0x88,0x83,0xC6,0xA1,0x86,0x8E,0xBF};
void Init_Timer0()
{
	TMOD=0x01;
	TH0=(65535-1000)/256;
	TL0=(65535-1000)%256;
	ET0=1;
	TR0=1;
	EA=1;
}
void Delay(unsigned char t)
{
	while(t--);
}
void DisplaySMG(unsigned char pos,unsigned char value)
{
	XBYTE[0xe000] = 0xff;
	XBYTE[0xc000]=0x01<<pos;
	XBYTE[0xe000]=value;
}
void ShowSMG(unsigned char pos,unsigned value)
{
	DisplaySMG(0,LedChar[pos]);
	Delay(200);
	DisplaySMG(6,LedChar[value]);
	Delay(200);
	DisplaySMG(7,LedChar[0]);
	Delay(200);
	
	DisplaySMG(0,0xff);
	DisplaySMG(6,0xff);
	DisplaySMG(7,0xff);
	
}
void ServiceTimer0() interrupt 1
{
	TH0=(65535-1000)/256;
	TL0=(65535-1000)%256;
	if(stat_go==0)
	{
		XBYTE[0x8000]=0xe7;
		return;
	}
	pwm++;
	if(pwm<=pwm_duty)
	{
		XBYTE[0x8000]=~(0x01<<stat);
	}
	else if(pwm<=10)
	{
		XBYTE[0x8000]=0xff;
	}
	else
	{
		XBYTE[0x8000]=~(0x01<<stat);
		pwm=0;
		if(key_puse==0)
		{
			times++;
		}
	}
	
}
void LED_Control()
{
	if(times==5)
	{
		times=0;
		if(led_go==0)
		{
			pwm_duty++;
			if(pwm_duty==11)
			{
				pwm_duty=10;
				led_go=1;
			}
		}
		else if(led_go==1)
		{
			pwm_duty--;
			if(pwm_duty==255)
			{
				pwm_duty=0;
				led_go=0;
				if(stat_go==1)
				{
					stat++;
					stat%=8;
				}
				else if(stat_go==2)
				{
					stat--;
					if(stat==255) stat=7;
				}
			}
		}
	}
}
void Scan_Keys()
{
	if(S4==0)
	{
		Delay(100);
		if(S4==0)
		{
			while(S4==0)
			{
				key_puse=1;
			}
			key_puse=0;
			stat_go++;
			if(stat_go==3) stat_go=1;
		}
	}
	if(S7==0)
	{
		Delay(100);
		if(S7==0)
		{
			while(S7==0)
			{
				key_puse=1;
				ShowSMG(stat+1,pwm_duty);
			}
			key_puse=0;
				
		}
	}
}
void Init_System()
{
	
	XBYTE[0xA000] = 0xff;
	XBYTE[0xA000] = 0x00;
	XBYTE[0xE000] = 0xff;
	XBYTE[0xC000] = 0xff;
	Init_Timer0();
	
}
void main()
{
	Init_System();
	while(1)
	{
		LED_Control();
		Scan_Keys();
	}
	
}