[嵌入式]【蓝桥杯单片机备赛】3.【SMG】共阳共阴数码管模板整理及真题实战心得

初学数码管的时候，曾经被数码管显示的亮度折磨过一段时间，现在来总结一遍自己对数码管的理解。

数码管又称 「 八位共阴/共阳数码管 」，简单来说就是一位数码管由八段组成，而让每段亮灭需要根据是共阳还是共阴来操作。

蓝桥杯的SMG是共阳极数码管

网上关于smg的讲解太多了，我就不讲了，依旧是从模板的角度出发，直接上代码分析记录

代码仿照小蜜蜂
这部分数组代码蓝桥杯有专门文件会提供哦，不用担心现写写错

共阳数码管（无小数）：unsigned char code smg[]={0xc0,0xf9,0xa4,0xb0,0x99, 0x92,0x82,0xf8,0x80,0x90, 0x88,0x83,0xc6,0xa1,0x86,0x8e,0xbf};

共阴数码管（无小数）：unsigned char code smg[]={0x3f,0x06,0x5b,0x4f,0x66, 0x6d,0x7d,0x07,0x7f,0x6f, 0x77,0x7c,0x39,0x5e,0x79,0x71};

共阳数码管（有小数）：unsigned char code smg[] = {0x40,0x79,0x24,0x30, 0x19,0x12,0x02,0x78 ,0x00,0x10,0x08,0x03,0x46,0x21,0x06,0x0e,0x3f};

共阴数码管（有小数）：unsigned char code smg[] = {0xbf,0x86,0xdb,0xcf,0xe6 0xed,0xfd,0x87,0xff,0x6f, 0xf7,0xfc,0xb9,0xde,0xf9,0xf1};

静态显示Static_show()

#include"reg52.h"

unsigned char code SmgNoDot[18] =
    {0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,
     0x80,0x90,0x88,0x80,0xc6,0xc0,0x86,0x8e,
     0xbf,0x7f};

		 
void delay(unsigned int t)//延时函数
{
		while(t--);
}

void Show_bit(unsigned char value,unsigned char pos)
{
   P2 = (P2 & 0x1f)| 0xc0;P0 = 0x01 << pos;P2 &= 0x1f;
	 P2 = (P2 & 0x1f)| 0xe0;P0 = value;P2 &= 0x1f;
}
//0xc0选中时对应了位
//0xe0对应段的选择

void Static_show()
{
     char i,j;
		 for(i = 0;i < 8;i++)
		 {
				for(j = 0;j < 10;j++)
			 {
			   Show_bit(SMG_D[j],i);
				 delay(60000);
			 }
		 }
		 
		 P2 = P2 & 0x1f | 0xc0;P0 = 0xff;P2 &= 0x1f;
		 
		 for(i = 0;i < 16;i++)
		 {
			 P2 = P2 & 0x1f | 0xe0;P0 = SMG_D[i];P2 &= 0x1f;
			 delay(60000);
		 }
}	//代码来自：https://bbs.21ic.com/icview-2409312-1-1.html

void main()
{
		P2 = P2 & 0x1f | 0xa0;P0 = 0;P2 &= 0x1f;
    while(1)
		{
			static_show();
		}
}

动态显示

// 驱动函数，不含测试
void SMG_Delay(){
	unsigned int t = 500;
	while(t--);
}

void SMG_ShowBit(unsigned int value,unsigned int pos){
	Init74HC138(6);
	P0 = (0x01 << pos);
	Init74HC138(7);
	P0 = value;
}

void Dynamic_show(unsigned int dat){
	SMG_ShowBit(SMG_NoDot[2],0);SMG_Delay();
	SMG_ShowBit(SMG_NoDot[0],1);SMG_Delay();
	SMG_ShowBit(SMG_NoDot[2],2);SMG_Delay();
	SMG_ShowBit(SMG_NoDot[1],3);SMG_Delay();
	SMG_ShowBit(SMG_NoDot[1],4);SMG_Delay();
	SMG_ShowBit(SMG_NoDot[3],5);SMG_Delay();
	SMG_ShowBit(SMG_NoDot[1],6);SMG_Delay();
	SMG_ShowBit(SMG_NoDot[4],7);SMG_Delay();
}

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