單片機型號說明：IAP15F2K61S2

新建工程時單片機型號選擇STC15F2K60S2

51單片機矩陣鍵盤代碼

void Delay_ms(int xms)	//15單片機延時函數(shù)
{
	int i;
	long a;
	for (i = xms; i > 0; i --)
		for(a = 810; a > 0; a --);
}

unsigned char KeyJZ_16(void)
{
	unsigned char KeyNumber;
	unsigned char temp;
	
	//第一列
	P3 = 0x7F;	//P37 = 0,其他是1，檢測第一列
	temp = P3;	//按鍵檢測，輸入
	temp &= 0x0F;
	if(temp != 0x0F)
	{
		Delay_ms(20);	//延時20ms來確認(rèn)是否真正按下按鍵
		temp = P3;
		temp &= 0x0F;//檢測是第一列哪個按鍵
		if(temp != 0x0F)
		{
			temp = P3;
			switch (temp)
			{
				case 0x7E : KeyNumber = 7; break;
				case 0x7D : KeyNumber = 6; break;
				case 0x7B : KeyNumber = 5; break;
				case 0x77 : KeyNumber = 4; break;
			}
			while(temp != 0x0f)
			{
				temp = P3;
				temp &= 0x0F;	//因為這條，所以松手檢測才寫成 temp != 0x0f
			}
		}
		
	}
	
	//第二列
	P3 = 0xBF;	
	temp = P3;
	temp &= 0x0F;
	if(temp != 0x0F)
	{
		Delay_ms(20);
		temp = P3;
		temp &= 0x0F;
		if(temp != 0x0F)
		{
			temp = P3;
			switch (temp)
			{
				case 0xBE : KeyNumber = 11; break;
				case 0xBD : KeyNumber = 10; break;
				case 0xBB : KeyNumber = 9; break;
				case 0xB7 : KeyNumber = 8; break;
			}
			while(temp != 0x0f)
			{
				temp = P3;
				temp &= 0x0F;	//因為這條，所以松手檢測才寫成 temp != 0x0f
			}
		}	
	}
	
	//第三列
	P3 = 0xDF;	
	temp = P3;
	temp &= 0x0F;
	if(temp != 0x0F)
	{
		Delay_ms(20);
		temp = P3;
		temp &= 0x0F;
		if(temp != 0x0F)
		{
			temp = P3;
			switch (temp)
			{
				case 0xDE : KeyNumber = 15; break;
				case 0xDD : KeyNumber = 14; break;
				case 0xDB : KeyNumber = 13; break;
				case 0xD7 : KeyNumber = 12; break;
			}
			while(temp != 0x0f)
			{
				temp = P3;
				temp &= 0x0F;	//因為這條，所以松手檢測才寫成 temp != 0x0f
			}
		}	
	}	
	
	//第四列
	P3 = 0xEF;	
	temp = P3;
	temp &= 0x0F;
	if(temp != 0x0F)
	{
		Delay_ms(20);
		temp = P3;
		temp &= 0x0F;
		if(temp != 0x0F)
		{
			temp = P3;
			switch (temp)
			{
				case 0xEE : KeyNumber = 19; break;
				case 0xED : KeyNumber = 18; break;
				case 0xEB : KeyNumber = 17; break;
				case 0xE7 : KeyNumber = 16; break;
			}
			while(temp != 0x0f)
			{
				temp = P3;
				temp &= 0x0F;	//因為這條，所以松手檢測才寫成 temp != 0x0f
			}
		}	
	}
	
	return KeyNumber;
}

本程序燒寫到51單片機應(yīng)該是正常使用的，手頭沒有51開發(fā)板了，暫時沒測試

這個程序燒寫到15單片機，前兩列按鍵不能正常使用

只需要在判斷第一列按鍵那部分程序，前面加上P42 = 0；

在判斷第二列按鍵那部分程序，前面加上P44?= 0；

因為這兩列接線是P42和P44

?

矩陣按鍵部分代碼（新寫法）

void Delay_ms(int xms)	//15單片機延時函數(shù)
{
	int i;
	long a;
	for (i = xms; i > 0; i --)
		for(a = 810; a > 0; a --);
}

unsigned char KeyJZ_16(void)
{
	unsigned char KeyNumber = 0;
	unsigned char temp;
	
	//第一列
	P3 = 0x7F;	//P37 = 0,其他是1，檢測第一列
	P4 = 0xEF;	//P44 = 0; P42 = 1;	//15單片機第一列占用的引腳
	temp = P3;	//按鍵檢測，輸入
	temp &= 0x0F;
	if(temp != 0x0F)
	{
		Delay_ms(20);	//延時20ms來確認(rèn)是否真正按下按鍵
		temp = P3;
		temp &= 0x0F;//檢測是第一列哪個按鍵
		if(temp != 0x0F)
		{
			temp = P3;
			switch (temp)
			{
				case 0x7E : KeyNumber = 7; break;
				case 0x7D : KeyNumber = 6; break;
				case 0x7B : KeyNumber = 5; break;
				case 0x77 : KeyNumber = 4; break;
			}
			while(temp != 0x0f)
			{
				temp = P3;
				temp &= 0x0F;	//因為這條，所以松手檢測才寫成 temp != 0x0f
			}
		}
		
	}
	
	//第二列
	P3 = 0xBF;
	P4 = 0xFB;	//P42 = 0; P44 = 1;	//15單片機第二列占用的引腳	
	temp = P3;
	temp &= 0x0F;
	if(temp != 0x0F)
	{
		Delay_ms(20);
		temp = P3;
		temp &= 0x0F;
		if(temp != 0x0F)
		{
			temp = P3;
			switch (temp)
			{
				case 0xBE : KeyNumber = 11; break;
				case 0xBD : KeyNumber = 10; break;
				case 0xBB : KeyNumber = 9; break;
				case 0xB7 : KeyNumber = 8; break;
			}
			while(temp != 0x0f)
			{
				temp = P3;
				temp &= 0x0F;	//因為這條，所以松手檢測才寫成 temp != 0x0f
			}
		}	
	}
	
	//第三列
	P3 = 0xDF;	
	P4 = 0xFF;
	temp = P3;
	temp &= 0x0F;
	if(temp != 0x0F)
	{
		Delay_ms(20);
		temp = P3;
		temp &= 0x0F;
		if(temp != 0x0F)
		{
			temp = P3;
			switch (temp)
			{
				case 0xDE : KeyNumber = 15; break;
				case 0xDD : KeyNumber = 14; break;
				case 0xDB : KeyNumber = 13; break;
				case 0xD7 : KeyNumber = 12; break;
			}
			while(temp != 0x0f)
			{
				temp = P3;
				temp &= 0x0F;	//因為這條，所以松手檢測才寫成 temp != 0x0f
			}
		}	
	}	
	
	//第四列
	P3 = 0xEF;	
	temp = P3;
	temp &= 0x0F;
	if(temp != 0x0F)
	{
		Delay_ms(20);
		temp = P3;
		temp &= 0x0F;
		if(temp != 0x0F)
		{
			temp = P3;
			switch (temp)
			{
				case 0xEE : KeyNumber = 19; break;
				case 0xED : KeyNumber = 18; break;
				case 0xEB : KeyNumber = 17; break;
				case 0xE7 : KeyNumber = 16; break;
			}
			while(temp != 0x0f)
			{
				temp = P3;
				temp &= 0x0F;	//因為這條，所以松手檢測才寫成 temp != 0x0f
			}
		}	
	}
	
	return KeyNumber;
}

測試鍵盤是否好使

#include <STC15F2K60S2.H>

unsigned char KeyNum;

void main()
{
	P2 = 0xA0; P0 = 0x00; P2 = 0x80; P0 = 0xFF;		//初始化
	while(1)
	{
		KeyNum = KeyJZ_16();
		if(KeyNum != 0)
		{
			P00 = !P00;	//每次按鍵按下P00狀態(tài)都會取反
		}
			
	}
}

一定要加初始化呀，這次忘了，按鍵根本不好使文章來源地址http://www.zghlxwxcb.cn/news/detail-449516.html

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