51单片机 LED 灯

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• https://blog.uso6.com
• https://blog.csdn.net/dxk539687357

得到8盏LED交替亮灭的实验效果

#include <reg51.h>

void Delay10ms(unsigned int c);	// 延时10ms

void main() 
{
	while(1) 
	{
		P0 = 0x00; // 设置 P0 为低电平
		Delay10ms(50); // 延时
		P0 = 0xff; // 设置 P0 为高电平
		Delay10ms(50); // 延时
	}
}

void Delay10ms(unsigned int c)
{
    unsigned char a, b;
    for (; c > 0; c--)
	{
		for (b = 38; b > 0; b--)
		{
			for (a = 130; a > 0; a--);
		}
	}
}

LED灯做二进制加1显示

#include <reg51.h>

void Delay10ms(unsigned int c);	// 延时10ms

void main() 
{
	unsigned char count = 0x00;
	while(1) 
	{
		P0 = count;
		Delay10ms(50); // 延时
		count++;
	}
}

void Delay10ms(unsigned int c)
{
    unsigned char a, b;
    for (; c > 0; c--)
	{
		for (b = 38; b > 0; b--)
		{
			for (a = 130; a > 0; a--);
		}
	}
}

延时实现LED流水灯效果P2口八个灯作跑马灯

#include <reg51.h>
// #include <intrins.h>
/** intrins.h 方法
_crol_ 字符循环左移
_cror_ 字符循环右移
_irol_ 整数循环左移
_iror_ 整数循环右移
_lrol_ 长整数循环左移
_lror_ 长整数循环右移
_nop_ 空操作8051 NOP 指令
_testbit_ 测试并清零位8051 JBC 指令函数名： _crol_，_irol_，_lrol_
*/

void Delay10ms(unsigned int c);	// 延时10ms

void main() 
{
	unsigned char LED;
	LED = ~0xfe;	// 0xfe = 1111 1110
	while(1) 
	{
		P0 = LED;
		Delay10ms(50); // 延时
		LED <<= 1;
		if (P0 == 0x00)
		{
			LED = ~0xfe;
		}
		// LED = _crol_(LED, 1);
	}
}

void Delay10ms(unsigned int c)
{
    unsigned char a, b;
    for (; c > 0; c--)
	{
		for (b = 38; b > 0; b--)
		{
			for (a = 130; a > 0; a--);
		}
	}
}

LED灯做跑马灯左右移动

#include <reg51.h>

void Delay10ms(unsigned int c);	// 延时10ms
unsigned char LED;
void main() 
{
	unsigned char i;
	LED = 0xfe;	// 0xfe = 1111 1110
	while(1) 
	{
		for (i = 0; i < 7; i++) 
		{
			P0 = LED;
			Delay10ms(50);
			LED <<= 1;
			LED |= 0x01;
		}
		for (i = 0; i < 7; i++) 
		{
			P0 = LED;
			Delay10ms(50);
			LED >>= 1;
			LED |= 0x80;
		}

	}
}

void Delay10ms(unsigned int c)
{
    unsigned char a, b;
    for (; c > 0; c--)
	{
		for (b = 38; b > 0; b--)
		{
			for (a = 130; a > 0; a--);
		}
	}
}