key.c

来自「lg tft-lcd 驱动程序源代码」· C语言 代码 · 共 41 行

#include <reg52.h>
#include "key.h"
#include "datatype.h"
#include "i2c.h"
static U8 counter = 0;

static U8 currentstatus = 0;

void key()
{
TR0=0;
ET0=0;
	if(!key1)
	  {
	  switch(currentstatus){
	  	case 0 : I2CWrite(0x00,0x00);break;
		case 1 : I2CWrite(0x01,0x00);break;
	  	case 2 : I2CWrite(0x02,0x00);break;
		}
	  currentstatus++;
	  if(currentstatus==3)
			  currentstatus=0;
	  }
	if(!key2)
		P2++;
	if(!key3)
		P2--;
TR0=1;
ET0=1;
}


void timer_isr(void) interrupt 1 
{
 counter++;
 if(counter==3)
 {
 	counter=0;
	key();
 }
}