蓝桥杯51单片机-共阳极数码管的显示_单片机共阳极怎么显示数字0，2024年最新真的已经讲烂了

我们先来了解一下数码管，分为共阳极和共阴极数码管

1. 共阴极：公共端为阴极，加阳极数码管点亮。即当真值为1时，数码管点亮；真值为0时，数码管不亮。
2. 共阳极：公共端为阳极，加阴极数码管点亮。即当真值为0时，数码管点亮；真值为1时，数码管不亮。

共阳不带小数点0-F段码为：{0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0x88,0x83,0xc6,0xa1,0x86,0x8e};

共阳带小数点0-F段码为：{0x40,0x79,0x24,0x30,0x19,0x12,0x02,0x78,0x00,0x10,0x08,0x03,0x46,0x21,0x06,0x0e};

共阴不带小数点0-F段码为：{0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71}；

共阴带小数点0-F段码为：{0xbf,0x86,0xdb,0xcf,0xe6,0xed,0xfd,0x87,0xff,0xef,0xf7,0xfc,0xb9,0xde,0xf9,0xf1};

在CT107D单片机平台上，数码管为共阳极数码管。我们要点亮数码管，分为两步，一个是输入编码(段选)，一个是选择公共端(位选)，即位置

那我们根据原理图可知，Y7与段选有关，Y6与位选有关

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

void InitHC138(unsigned char n)
{
	switch(n)
	{
		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;
	}
}

void ShowSMG_Bit(unsigned char dat, unsigned pos)
{
	InitHC138(6);			//数码管的位置
	P0 = 0x01 << pos;
	InitHC138(7);			//数码管的内容
	P0 = dat;
}

通过以上函数，即可自由地在数码管上显示，例如

#include "reg52.h"

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

			 
void InitHC138(unsigned char n)
{
	switch(n)
	{
		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;
	}
}

void ShowSMG_Bit(unsigned char dat, unsigned pos)
{
	InitHC138(6);			//数码管的位置
	P0 = 0x01 << pos;
	InitHC138(7);			//数码管的内容
	P0 = dat;
}

void main()
{
	ShowSMG_Bit(SMG_duanma[5],6);
	while(1);
}

可以在数码管的第7个位置显示5

有了以上基础，我们就能很容易的实现基本功能

#include "reg52.h"

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

		 
void Delay(unsigned int t)
{
	while(t--);
	while(t--);
}
			 
void InitHC138(unsigned char n)
{


**收集整理了一份《2024年最新物联网嵌入式全套学习资料》，初衷也很简单，就是希望能够帮助到想自学提升的朋友。**
![img](https://p9-xtjj-sign.byteimg.com/tos-cn-i-73owjymdk6/c3dd749e005b494d9a9ea7790319f301~tplv-73owjymdk6-jj-mark-v1:0:0:0:0:5o6Y6YeR5oqA5pyv56S-5Yy6IEAg5py65Zmo5a2m5Lmg5LmL5b-DQUk=:q75.awebp?rk3s=f64ab15b&x-expires=1770654506&x-signature=ile8LVdSZa3OZ4b1DEB%2FfM8z728%3D)
![img](https://p9-xtjj-sign.byteimg.com/tos-cn-i-73owjymdk6/a93ab3b115c54913aa40b3adb8e3958c~tplv-73owjymdk6-jj-mark-v1:0:0:0:0:5o6Y6YeR5oqA5pyv56S-5Yy6IEAg5py65Zmo5a2m5Lmg5LmL5b-DQUk=:q75.awebp?rk3s=f64ab15b&x-expires=1770654506&x-signature=OTbtK%2Bz1%2FpzMjieyKCUaq4KR4ao%3D)

**[如果你需要这些资料，可以戳这里获取](https://gitee.com/vip204888)**

**一个人可以走的很快，但一群人才能走的更远！不论你是正从事IT行业的老鸟或是对IT行业感兴趣的新人**

**都欢迎加入我们的的圈子（技术交流、学习资源、职场吐槽、大厂内推、面试辅导），让我们一起学习成长！**