key.c

tea5767_102模块,i2c总线控制方式

#include "key.h"
#include "global.h"
#include <reg52.h>
#include <intrins.h>

//P04,P05;二键


unsigned char Read_Key(void)
{
  unsigned char Key = 0x00;

  P0 |= 0x30;

  delay_us(10);

  Key = P0 & 0x30;
  switch  ( Key )
  {
  case 0x10: return 1;
  case 0x20: return 2;
  case 0x00: return 3;
  default: return 0xF0;
  }
  


}