蓝桥杯单片机第十四届国赛 代码及演示_蓝桥杯单片机十四届国赛代码

        去年14届的国赛题，个人感觉难度适中。主要的难点在于，S8\S9按键长按清楚数据，以及同时按下时，记录超声波的测量值。 还有一个值得注意的是，在校准值中，引入了负数（这点需要特别注意）。当在-5再减到-10时，数码管的处理是一个小难点。LED灯也不同于往年的考法，结合了二进制的知识点。

        此次试题，本人用了几个巧妙地方法完美实现以上问题。以下为代码实现部分，所有都为本人一人编写，仅供大家学习交流。

        

矩阵键盘部分

#include <STC15F2K60S2.H>
 
unsigned char Key_read()
{
	unsigned char temp=0;
	
	P44=0;P42=1;P35=1;P34=1;
	if(P30==0)temp=7;
	if(P31==0)temp=6;
	if(P32==0)temp=5;
	if(P33==0)temp=4;
	
	P44=1;P42=0;P35=1;P34=1;
	if(P30==0)temp=11;
	if(P31==0)temp=10;
	if(P32==0)temp=9;
	if(P33==0)temp=8;
	
	P44=1;P42=1;P35=0;P34=1;
	if(P30==0)temp=15;
	if(P31==0)temp=14;
	if(P32==0)temp=13;
	if(P33==0)temp=12;
	
	P44=1;P42=1;P35=1;P34=0;
	if(P30==0)temp=19;
	if(P31==0)temp=18;
	if(P32==0)temp=17;
	if(P33==0)temp=16;
	
	return temp;
}

数码管部分

#include <STC15F2K60S2.H>
 
code unsigned char Shu[]=
{
0xc0,
0xf9,
0xa4,
0xb0,
0x99,
0x92,
0x82,
0xf8,
0x80,
0x90,
0xff,
0xbf,  //-
0x8c,  //P
0x8e  //F
};
 
void InitHC138(unsigned char u,num)
{
	P0=num;
	switch(u)
	{
		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;
	}
	P2=P2&0x1f|0x00;
}
 
void SMG(unsigned char location,num,point)
{
	InitHC138(7,0xff);
	InitHC138(6,0x01<<location);
	
	P0=Shu[num];
	if(point)
		P0&=0x7f;
	P2=P2&0x1f|0xe0;
	P2=P2&0x1f|0x00;
}

LED、继电器模块

#include <STC15F2K60S2.H>
 
static unsigned char temp1=0x00;
static unsigned char old1=0xff;
 
void Led_read(unsigned char addr,able)
{
	static unsigned char temp=0x00;
	static unsigned char old=0xff;
	
	if(able)
		temp|=0x01<<addr;
	else
		temp&=~(0x01<<addr);
	
	if(temp!=old)
	{
		P0=~temp;
		P2=P2&0x1f|0x80;
		P2=P2&0x1f|0x00;
		old=temp;
	}
}
 
void Relay(unsigned char able)
{
	if(able)
		temp1|=0x10;
	else
		temp1&=~0x10;
	
	if(temp1!=old1)
	{
		P0=temp1;
		P2=P2&0x1f|0xa0;
		P2=P2&0x1f|0x00;
		old1=temp1;
	}
}

温度读取模块（省去onewire给的代码）

float Temperture()
{
	unsigned char low,high;
	unsigned int temp;
	float t;
	
	init_ds18b20();
	Write_DS18B20(0xcc);
	Write_DS18B20(0x44);
	Delay_OneWire(200);
	init_ds18b20();
	Write_DS18B20(0xcc);
	Write_DS18B20(0xbe);
	low=Read_DS18B20();
	high=Read_DS18B20();
	temp=(high<<8)|low;
	t=temp*0.0625;
	
	return t;
}

超声波模块

#include <STC15F2K60S2.H>
#include "intrins.h"
 
sbit TX=P1^0;
sbit RX=P1^1;
 
void Delay12us(void)	//@12.000MHz
{
	unsigned char data i;
	_nop_();
	_nop_();
	i = 40;
	while (--i);
}
 
void Wave_Init()
{
	unsigned char i;
	for(i=0;i<8;i++)
	{
		TX=1;
		Delay12us();
		TX=0;
		Delay12us();
	}
}
 
unsigned char Wave_get()
{
	unsigned int time;
	TMOD&=0x0f;
	TH1=TL1=0;
	Wave_Init();
	TR1=1;
	while((RX==1) && (TF1==0));
	TR1=0;
	
	if(TF1==0)
	{
		time=(TH1<<8)|TL1;
		return time*0.017;
	}
	else
	{
		TF1=0;
		return 0;
	}
}
 

DA输出模块（省去iic给的代码）

void DA(unsigned char dat)
{
	I2CStart();
	I2CSendByte(0x90);
	I2CWaitAck();
	I2CSendByte(0x43);
	I2CWaitAck();
	I2CSendByte(dat);
	I2CWaitAck();
	I2CStop();
}

主函数

#include <STC15F2K60S2.H>
#include "intrins.h"
#include "Key.h"
#include "Seg.h"
#include "Led.h"
#include "onewire.h"
#include "Wave.h"
#include "iic.h"
 
unsigned char Key_time;
unsigned int Seg_time;
 
unsigned char Key_value,Key_dowm,Key_up,Key_old;
unsigned char Seg_buf[]={10,10,10,10,10,10,10,10,10,10};
unsigned char Seg_point[]={0,0,0,0,0,0,0,0};
unsigned char Seg_pos;
unsigned char Led_buf[]={0,0,0,0,0,0,0,0};
 
float T;
int L;
unsigned char Mode;
unsigned char Show_L=40;  //¾àÀë²ÎÊý
unsigned char Show_T=30;  //ζȲÎÊý
unsigned char Mode_can;   //²ÎÊýģʽ1/2
unsigned char Mode_can3;   //²ÎÊýģʽ3
unsigned char Change_can;  //У׼ֵ
unsigned char Fu;          //¸ºÊýУ׼ֵ
int Speed=340;   //´«ÊäËÙÂÊ
unsigned char V=10;  //µçѹ
float V_use;
unsigned char HEX[8]={128,64,32,16,8,4,2,1};
unsigned char Ad_num;
unsigned char Time_100ms;
unsigned char State;             //µÆ±ä»»ÁÁÃð
 
void Key_get()
{
	if(Key_time)return;
	Key_time=1;
	
	Key_value=Key_read();
	Key_dowm=Key_value&(Key_value^Key_old);
	Key_up=~Key_value&(Key_value^Key_old);
	Key_old=Key_value;
	
	switch(Key_dowm)
	{
		case 4:
			if(++Mode==3)Mode=0;
			Mode_can=0;
			Mode_can3=0;
		break;
		
		case 5:
			if(Mode==0 || Mode==1)Mode_can^=1;
			if(Mode==2)
			{
				if(++Mode_can3==3)Mode_can3=0;
			}
		break;
			
		case 8:                                    //¼Ó
			if(Mode==1)
			{
				if(Mode_can==0)
				{
					Show_L+=10;
					if(Show_L==100)Show_L=90;
				}
				else
				{
					if(++Show_T==81)Show_T=80;
				}
			}
			else if(Mode==2)
			{
				if(Mode_can3==0)                                  
				{
					if(Fu==0 && Change_can>=0)
					{
						Change_can+=5;
						if(Change_can==95)Change_can=90;
					}
					if(Fu>0)
						Fu-=5;
				}
				else if(Mode_can3==1)
				{
					Speed+=10;
					if(Speed==9995)Change_can=9990;
				}
				else
				{
					if(++V==21)V=20;
				}
			}
		break;
		
		case 9:                                     
			if(Mode==1)                        //²ÎÊý¼õ
			{
				if(Mode_can==0)
				{
					Show_L-=10;
					if(Show_L==0)Show_L=10;
				}
				else
				{
					if(--Show_T==255)Show_T=0;
				}
			}
			else if(Mode==2)                     //¹¤³§Ä£Ê½
			{
				if(Mode_can3==0)                             
				{
					if(Change_can==0 && Fu>=0)
					{
						Fu+=5;
						if(Fu==95)Fu=90;
					}
					if(Change_can>0)
						Change_can-=5;
				}
				else if(Mode_can3==1)
				{
					Speed-=10;
					if(Speed==0)Change_can=10;
				}
				else
				{
					if(--V==0)V=1;
				}
			}
		break;
	}
	
}
 
void Seg_get()
{
	if(Seg_time)return;
	Seg_time=1;
	
	T=Temperture();
	L=(Speed/340)*Wave_get()+(Change_can>Fu?Change_can:-Fu);
	
	switch(Mode)
	{
		case 0:
			Seg_buf[0]=T/10;
			Seg_buf[1]=(unsigned char)T%10;
			Seg_buf[2]=(unsigned int)(T*10)%10;
			Seg_buf[3]=11;
			Seg_point[1]=1;
			Seg_point[6]=0;
			if(Mode_can==0)
			{
				Seg_buf[5]=L>99?L/100%10:10;
				Seg_buf[6]=L/10%10;
				Seg_buf[7]=L%10;
				Seg_point[5]=0;
			}
			else
			{
				Seg_buf[5]=L>99?L/100%10:0;
				Seg_buf[6]=L/10%10;
				Seg_buf[7]=L%10;
				Seg_point[5]=1;
			}
		break;
		
		case 1:
			Seg_buf[0]=12;
			Seg_buf[2]=10;
			Seg_buf[3]=10;
			Seg_buf[5]=10;
			Seg_point[1]=0;
			Seg_point[5]=0;
			if(Mode_can==0)
			{
				Seg_buf[1]=1;
				Seg_buf[6]=Show_L/10;
				Seg_buf[7]=Show_L%10;
			}
			else
			{
				Seg_buf[1]=2;
				Seg_buf[6]=Show_T/10;
				Seg_buf[7]=Show_T%10;
			}
		break;
		
		case 2:
			Seg_buf[0]=13;
			if(Mode_can3==0)
			{ 
				Seg_buf[1]=1;
				Seg_point[6]=0;
				if(Change_can>0 || Change_can==Fu)
				{
					Seg_buf[5]=10;
					Seg_buf[6]=Change_can<10?10:Change_can/10;
					Seg_buf[7]=Change_can%10;
				}
				if(Fu>0)
				{
					Seg_buf[5]=Fu>=10?11:10;
					Seg_buf[6]=Fu<10?11:Fu/10;
					Seg_buf[7]=Fu%10;
				}
			}
			else if(Mode_can3==1)
			{
				Seg_buf[1]=2;
				Seg_buf[4]=Speed>999?Speed/1000%10:10;
				Seg_buf[5]=Speed>99?Speed/100%10:10;
				Seg_buf[6]=Speed/10%10;
				Seg_buf[7]=Speed%10;
			}
			else
			{
				Seg_buf[1]=3;
				Seg_buf[4]=10;
				Seg_buf[5]=10;
				Seg_point[6]=1;
				if(V>=10)
				{
					Seg_buf[6]=V/10;
					Seg_buf[7]=V%10;
				}
				else
				{
					Seg_buf[6]=0;
					Seg_buf[7]=V%10;
				}
			}
		break;
	}
	
}
 
void Led_get()
{
	unsigned char i;
	int temp=L;
	if(Mode==1)
	{
		for(i=0;i<7;i++)                    //ϨÃðÆäÓà7ÕµµÆ£¬ÁôL8
			Led_buf[i]=0;
		Led_buf[7]=1;
	}
	else if(Mode==2)
	{
		for(i=1;i<8;i++)                    
			Led_buf[i]=0;
		Led_buf[0]=State;
	}
	else
	{
		for(i=0;i<8;i++)
		{
			if(temp>HEX[i])
			{
				Led_buf[7-i]=1;
				temp-=HEX[i];
			}
			else if(temp==HEX[i])              //¸ÕºÃµÈÓÚ1¡¢2¡¢4¡¢8¡¢16...
			{
				Led_buf[7-i]=1;
				temp=0;
			}			
			else
				Led_buf[7-i]=0;
		}
	}
	
	V_use=V/10;
	if(L>=90)Ad_num=5;
	if(L<=10)Ad_num=V_use;
	if(L>10 && L<90)Ad_num=((5-V_use)/80)*L+(9*V_use-5)/8;
	DA(Ad_num*51);
	
	if((Show_L-5<=L && Show_L+5>=L) && T<=Show_T)
		Relay(1);
	else
		Relay(0);
}
 
void Timer0_Init()		
{
	AUXR &= 0x7F;			
	TMOD &= 0xF0;			
	TL0 = 0x18;				
	TH0 = 0xFC;				
	TF0 = 0;				
	TR0 = 1;
	EA=1;
	ET0=1;
}
 
void Delay750ms(void)	
{
	unsigned char data i, j, k;
	_nop_();
	_nop_();
	i = 35;
	j = 51;
	k = 182;
	do
	{
		do
		{
			while (--k);
		} while (--j);
	} while (--i);
}
 
void main()
{
	InitHC138(4,0xff);
	InitHC138(5,0x00);
	Timer0_Init();
	Temperture();
	Delay750ms();
	while(1)
	{
		Key_get();
		Seg_get();
		Led_get();
	}
}
 
void Init_T0() interrupt 1
{
	if(++Key_time==10)Key_time=0;
	if(++Seg_time==200)Seg_time=0;
	if(++Seg_pos==8)Seg_pos=0;
	SMG(Seg_pos,Seg_buf[Seg_pos],Seg_point[Seg_pos]);
	Led_read(Seg_pos,Led_buf[Seg_pos]);
	
	if(++Time_100ms==100)
	{
		Time_100ms=0;
		State^=1;
	}
}