key.c

AVR开发板 C实现 液晶 can总线控制及其他外围电路源代码

#include "key.h"

#define KEY1	PF3
#define KEY2    PF2


void Key_InIt(void)
{
	DDRF = 0XF3;
	PORTF =0XFF;	
}

uchar GetKey(void)
{
	uchar ret = 0;
	while(1)
	{
		ret = PINF;
		if(!(PINF &_BV(KEY1)))
		{
			//延时消抖
			DelayMs(5);
			if(!(PINF &_BV(KEY1)))
			{
				ret = 1;
				break;
			}
		}
		if(!(PINF &_BV(KEY2)))
		{
			//延时消抖
			DelayMs(5);
			if(!(PINF &_BV(KEY2)))
			{
				ret = 2;
				break;
			}
		}
		DelayMs(5);
	}

	//等待弹起
	while((PINF &(_BV(KEY1) |_BV(KEY2) )) != (_BV(KEY1) |_BV(KEY2)))
		DelayMs(1);
	return ret;
}


/*

	uchar i =0,flag = 0, key;
	Key_InIt();

	while(1)
	{
		key = GetKey();
		switch(key)
		{
			case 0 :
				BeeP();
				DelayMs(2000);
				break;
			case 1 :	
				BeeP();
				DelayMs(2000);					
				break;
			case 2 :
				BeeP();
				DelayMs(2000);
				break;
			case 3 :
				BeeP();
				DelayMs(2000);
				break;
			case 4 :
				BeeP();
				DelayMs(2000);
				break;
			default :
				break;

		}
	}

*/