独立按键的拓展

本期在上一期的拓展下，实现不同状态下按键对于LED灯的控制。

根据代码可知，定义S7到S4的按键以及L1到L6的LED灯，其次是选择HC573译码器，设置不同4个信道接口。其次是设置延时，以便后面低电平判断使用。重点是ScanKeys函数的使用，调用延时函数防止误触。通过判断S7以及后面不同按键的状态（是否为低电平，按键按下时为低电平），按下时给LED灯一个高电平，使其变亮。

代码如下：

#include "reg52.h"

sbit S7 = P3^0;
sbit S6 = P3^1;
sbit S5 = P3^2;
sbit S4 = P3^3;

sbit L1 = P0^0;
sbit L2 = P0^1;
sbit L3 = P0^2;
sbit L4 = P0^3;
sbit L5 = P0^4;
sbit L6 = P0^5;

void SelectHC573(unsigned char channel)
{
	switch(channel)
	{
		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 DelayK(unsigned char t)
{
	while(t--);
}

unsigned char stat_k=0;
void ScanKeys_Alone()
{
	if(S7 == 0)
	{
		DelayK(100);
		if(S7 == 0)
		{
			if(stat_k == 0)
			{
				L1 = 0;
				stat_k =1;
			}
			else if(stat_k == 1)
			{
				L1 = 1;
				stat_k = 0;
			}
			while(S7 == 0);
		}
	}
	if(S6 == 0)
	{
		DelayK(100);
		if(S6 == 0)
		{
			if(stat_k == 0)
			{
				L2 =0;
				stat_k = 2;
				
			}
			else if(stat_k == 2)
			{
				L2 = 1;
				stat_k = 0;
			}
			while(S6 == 0);
		}
	}
	if(S5 == 0)
	{
		DelayK(100);
		if(S5 == 0)
		{
			if(stat_k == 1)
			{
				L3 = 0;
				while(S5 == 0);
				L3 = 1;
			}
			else if(stat_k == 2)
			{
				L5 = 0;
				while(S5 == 0);
				L5 = 1;
			}
		}
	}
	if(S4 == 0)
	{
		DelayK(100);
		if(stat_k == 1)
			{
				L4 = 0;
				while(S4 == 0);
				L4 = 1;
			}
			else if(stat_k == 2)
			{
				L6 = 0;
				while(S4 == 0);
				L6 = 1;
			}
	}
}

void main()
{
	SelectHC573(4);
	while(1)
	{
		ScanKeys_Alone();
	}
}

版权声明：本文为CSDN博主「有馬公生」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/Wayne_zzx1112233/article/details/122612090

本期在上一期的拓展下，实现不同状态下按键对于LED灯的控制。

代码如下：

#include "reg52.h"

sbit S7 = P3^0;
sbit S6 = P3^1;
sbit S5 = P3^2;
sbit S4 = P3^3;

sbit L1 = P0^0;
sbit L2 = P0^1;
sbit L3 = P0^2;
sbit L4 = P0^3;
sbit L5 = P0^4;
sbit L6 = P0^5;

void SelectHC573(unsigned char channel)
{
	switch(channel)
	{
		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 DelayK(unsigned char t)
{
	while(t--);
}

unsigned char stat_k=0;
void ScanKeys_Alone()
{
	if(S7 == 0)
	{
		DelayK(100);
		if(S7 == 0)
		{
			if(stat_k == 0)
			{
				L1 = 0;
				stat_k =1;
			}
			else if(stat_k == 1)
			{
				L1 = 1;
				stat_k = 0;
			}
			while(S7 == 0);
		}
	}
	if(S6 == 0)
	{
		DelayK(100);
		if(S6 == 0)
		{
			if(stat_k == 0)
			{
				L2 =0;
				stat_k = 2;
				
			}
			else if(stat_k == 2)
			{
				L2 = 1;
				stat_k = 0;
			}
			while(S6 == 0);
		}
	}
	if(S5 == 0)
	{
		DelayK(100);
		if(S5 == 0)
		{
			if(stat_k == 1)
			{
				L3 = 0;
				while(S5 == 0);
				L3 = 1;
			}
			else if(stat_k == 2)
			{
				L5 = 0;
				while(S5 == 0);
				L5 = 1;
			}
		}
	}
	if(S4 == 0)
	{
		DelayK(100);
		if(stat_k == 1)
			{
				L4 = 0;
				while(S4 == 0);
				L4 = 1;
			}
			else if(stat_k == 2)
			{
				L6 = 0;
				while(S4 == 0);
				L6 = 1;
			}
	}
}

void main()
{
	SelectHC573(4);
	while(1)
	{
		ScanKeys_Alone();
	}
}