蓝桥杯单片机数码管技巧

数码管使用技巧

1如何运用数码管配合按键切换界面显示切换界面

方法:定义一个变量来显示显示界面；通过按键来改变变量的数值；从而切换显示界面。

#include <STC15F2K60S2.H>

void  Device_ctrl(unsigned char p2date,unsigned char p0date)//锁存器控制函数
{
		P0=p0date; 
	  P2=(P2&0X1F)|p2date;
	  P2&=0X1F;
}

unsigned char smg_count;
unsigned char smg_display[8];
unsigned char smg_du[]={0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F};//共阳极段码
unsigned char display_mode;//界面显示

void smg_show()
{
		unsigned int i;
	  Device_ctrl(0xc0,0);
	  Device_ctrl(0xe0,~smg_display[i]);
		Device_ctrl(0xc0,0x01<<i);
	  i=(i+1)%8;
}

void smg_process()
{
		if(smg_count>3)
    {
			smg_count=0;
			 
			if(display_mode==0)//显示第一个界面
			{
				smg_display[0]=smg_du[0];
				smg_display[1]=smg_du[1];
				smg_display[2]=smg_du[2];
				smg_display[3]=smg_du[3];
				
				smg_display[4]=smg_du[4];
				smg_display[5]=smg_du[5];
				smg_display[6]=smg_du[6];
				smg_display[7]=smg_du[7];
			}
			
			if(display_mode==1)//显示第二个界面
			{
				smg_display[0]=smg_du[1];
				smg_display[1]=smg_du[2];
				smg_display[2]=smg_du[3];
				smg_display[3]=smg_du[4];
				
				smg_display[4]=smg_du[5];
				smg_display[5]=smg_du[6];
				smg_display[6]=smg_du[7];
				smg_display[7]=smg_du[8];
			}
		}
}

unsigned char trig_btn;
unsigned char con_btn;
unsigned int key_count;

void key_btn()//按键扫描函数
{
		unsigned char readdate=P3^0xff;
	  trig_btn=readdate&(con_btn^0xff);
	  con_btn=readdate;
}

void key_process()//按键处理函数
{
		if(key_count>10)//每十毫秒扫描一次按键
		{
			  key_count=0;
			  key_btn();
				if(trig_btn==0x08)//按键s4
				{
					display_mode++;
					if(display_mode==2)//切换界面0 1
					{
						display_mode=0;
					}
				}
		}
}
void Timer2Init()		//1毫秒@12.000MHz
{
	AUXR &= 0xFB;		//定时器时钟12T模式
	T2L = 0x18;		//设置定时初值
	T2H = 0xFC;		//设置定时初值
	AUXR |= 0x10;		//定时器2开始计时
	IE2|=0x04;
	EA=1;
}

void main()
{
	 
	  Timer2Init();
	  Device_ctrl(0x80,0xff);
	 
		while(1)
		{
			smg_process();
			key_process();
		}

}

void service_timer2() interrupt 12
{
		smg_count++;
	  key_count++;
	  smg_show();
}

2如何让数码管数据实现一秒亮灭

在定时器中设置一个一秒的定时；然后再用一个标志位显示，如果到了一秒就让数码管亮一秒没到的话就熄灭。

#include <STC15F2K60S2.H>

void  Device_ctrl(unsigned char p2date,unsigned char p0date)
{
		P0=p0date; 
	  P2=(P2&0X1F)|p2date;
	  P2&=0X1F;
}

unsigned char smg_count;
unsigned char smg_display[8];
unsigned char smg_du[]={0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F};
unsigned char display_mode;

void smg_show()
{
		unsigned int i;
	  Device_ctrl(0xc0,0);
	  Device_ctrl(0xe0,~smg_display[i]);
		Device_ctrl(0xc0,0x01<<i);
	  i=(i+1)%8;
}
bit smg_blink;
void smg_process()
{
		if(smg_count>3)
    {
			smg_count=0;
			
			 if(smg_blink)
			 {
				  smg_display[0]=smg_du[0];
					smg_display[1]=smg_du[1];
					smg_display[2]=smg_du[2];
					smg_display[3]=smg_du[3];
					
					smg_display[4]=smg_du[4];
					smg_display[5]=smg_du[5];
					smg_display[6]=smg_du[6];
					smg_display[7]=smg_du[7];
			 }
			 else
			 {
					smg_display[0]=0x00;
					smg_display[1]=0x00;
					smg_display[2]=0x00;
					smg_display[3]=0x00;
					
					smg_display[4]=0x00;
					smg_display[5]=0x00;
					smg_display[6]=0x00;
					smg_display[7]=0x00;
			 }
			 
			
		}
}


void Timer2Init()		//1毫秒@12.000MHz
{
	AUXR &= 0xFB;		//定时器时钟12T模式
	T2L = 0x18;		//设置定时初值
	T2H = 0xFC;		//设置定时初值
	AUXR |= 0x10;		//定时器2开始计时
	IE2|=0x04;
	EA=1;
}

void main()
{
	  Timer2Init();//定时器初始化
	  Device_ctrl(0x80,0xff);
	 
		while(1)
		{
			smg_process();
	
		}

}

void service_timer2() interrupt 12//定时器使用函数
{
	  unsigned int time_count;//定时器计时变量
	  time_count++;
	  if(time_count>1000)//定时一秒
		{
			time_count=0;
			smg_blink=!smg_blink;
		}
		smg_count++;
	  smg_show();
}

3数码管显示有用数据，没有显示的熄灭。

方法:按照十位百位千位判断

#include <STC15F2K60S2.H>

void  Device_ctrl(unsigned char p2date,unsigned char p0date)
{
		P0=p0date; 
	  P2=(P2&0X1F)|p2date;
	  P2&=0X1F;
}

unsigned char smg_count;
unsigned char smg_display[8];
unsigned char smg_du[]={0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F};
unsigned char display_mode;
unsigned int number=12345;
void smg_show()
{
		unsigned int i;
	  Device_ctrl(0xc0,0);
	  Device_ctrl(0xe0,~smg_display[i]);
		Device_ctrl(0xc0,0x01<<i);
	  i=(i+1)%8;
}

void smg_process()
{
		if(smg_count>3)
    {
			smg_count=0;
			
			 if(number>9999)//如果大于9999
			 {
				    smg_display[0]=0x00;
						smg_display[1]=0x00;
						smg_display[2]=0x00;
						smg_display[3]=smg_du[number/10000];
						
						smg_display[4]=smg_du[number/1000%10];
						smg_display[5]=smg_du[number/100%10];
						smg_display[6]=smg_du[number/10%10];
						smg_display[7]=smg_du[number%10];
			}
			else if(number>999)	//如果大于999  
			{
						smg_display[0]=0x00;
						smg_display[1]=0x00;
						smg_display[2]=0x00;
						smg_display[3]=0x00;
						
						smg_display[4]=smg_du[number/1000%10];
						smg_display[5]=smg_du[number/100%10];
						smg_display[6]=smg_du[number/10%10];
						smg_display[7]=smg_du[number%10];
			}
			else if(number>99)//如果大于99
			{
						smg_display[0]=0x00;
						smg_display[1]=0x00;
						smg_display[2]=0x00;
						smg_display[3]=0x00;
						
						smg_display[4]=0x00;
						smg_display[5]=smg_du[number/100%10];
						smg_display[6]=smg_du[number/10%10];
						smg_display[7]=smg_du[number%10];
			}
			else if(number>9)//如果大于9
			{
						smg_display[0]=0x00;
						smg_display[1]=0x00;
						smg_display[2]=0x00;
						smg_display[3]=0x00;
						
						smg_display[4]=0x00;
						smg_display[5]=0x00;
						smg_display[6]=smg_du[number/10%10];
						smg_display[7]=smg_du[number%10];
			}
			else
			{
						smg_display[0]=0x00;
						smg_display[1]=0x00;
						smg_display[2]=0x00;
						smg_display[3]=0x00;
						
						smg_display[4]=0x00;
						smg_display[5]=0x00;
						smg_display[6]=0x00;
						smg_display[7]=smg_du[number%10];
			}
		}
}


void Timer2Init()		//1毫秒@12.000MHz
{
	AUXR &= 0xFB;		//定时器时钟12T模式
	T2L = 0x18;		//设置定时初值
	T2H = 0xFC;		//设置定时初值
	AUXR |= 0x10;		//定时器2开始计时
	IE2|=0x04;
	EA=1;
}

void main()
{
	  Timer2Init();//定时器初始化
	  Device_ctrl(0x80,0xff);
	 
		while(1)
		{
			smg_process();
	
		}

}

void service_timer2() interrupt 12//定时器使用函数
{
	 
		smg_count++;
	  smg_show();
}