key.c

Tea5767的3线控制程序

#include "key.h"
#include <iom8.h>
//PORTB0,PORTB1;二键//,PORTB2三键


unsigned char Read_Key(void)
{
  unsigned char   Key = 0x00;
//  DDRB |= 0x03;
//  PORTB |= 0x03;
  DDRB &= 0xFC;
  Key = PINB & 0x03;
  switch  ( Key )
  {
  case 2: return 1;
  case 1: return 2;
  case 0: return 3;
  default: return 0;
  }
  


}