51单片机入门class1.2

最新推荐文章于 2023-10-06 18:11:59 发布

原创最新推荐文章于 2023-10-06 18:11:59 发布 · 310 阅读

1 ·

CC 4.0 BY-SA版权

博客主要介绍了高电平点亮流水灯的内容，并且实现了将流水灯逆序反复点亮，还提到了优化过后的情况。

高电平点亮流水灯

流水灯的电路图

在这里插入图片描述

#include<reg51.h>
void delay(unsigned int time)
{
	unsigned char t;
	for(; time > 0;time--)
		for(t = 125; t > 0; t--);
}
void main(void)
{
	unsigned char a = 0x01;
	while(1)
	{
	    if( a == 0x00)
		a = 0x01;   //注意高位溢出情况，若溢出则恢复
		P2 = a;
		a = a << 1;   //循环点亮
		delay(1000);
	}
}

将流水灯逆序反复点亮

#include<reg51.h>
void delay(unsigned int time)
{
	unsigned char t;
	for(; time > 0;time--)
		for(t = 125; t > 0; t--);
}
void main()
{
	unsigned char a = 0x01;
	unsigned char true = 1;
	while(1)
	{	while(true)
		{
			P2 = a;
			a = a << 1;
			delay(1000);
			if(a == 0x00)
			{
				a = 0x80;
				true = 0;
			}
		}
		true = 1;
		while(true)
		{
			P2 = a;
			a = a >> 1;
			delay(1000);
			if(a == 0x00)
			{
				a = 0x01;
				true = 0;
			}
		}
		true = 1;
	}

}

（优化过后）

#include<reg51.h>
void delay(unsigned int time)
{
	unsigned char t;
	for(; time > 0;time--)
		for(t = 125; t > 0; t--);
}
void main(void)
{
	unsigned char t;
	while(1)
	{
		P2 = 0x01;
		for(t = 0;t < 8;t++)
		{
			delay(1000);
			P2 = P2 << 1;	
		}
		P2 = 0x80;
		for(t = 0;t < 8;t++)
		{
			delay(1000);
			P2 = P2 >> 1;	
		}
	}
}