[资料分享] MSP430G2553 状态机建模

程序要求是短按p1.3的话，出现p1.0取反，长按p1.3的话，p1.6取反，下面是程序：

#include "msp430g2553.h"
#define IDLE 0
#define SHORT 1
#define LONG 2
#define COUNTER_THRESHOLD 50
unsigned char key_dect;
unsigned char WDT_Counter=0;
void GPIO_init();
void Key_SM();
void WDT_init();
unsigned char LongClick_Dect();
void P13_OnShortRelease();
void P13_OnLongClick();

int main(void) {
    WDTCTL = WDTPW | WDTHOLD;
 GPIO_init();
 WDT_init();
 _enable_interrupts();
 _bis_SR_register(LPM3_bits);
}

void GPIO_init()
{
 P1DIR|=BIT0+BIT6;
 P1OUT|=BIT0;
 P1OUT&=~BIT6;
 P1REN|=BIT3;
 P1OUT|=BIT3;
 //P1DIR&=~BIT3;
 //P1IES|=BIT3;
 //P1IE|=BIT3;
}

void WDT_init()//为了消除尖刺  
{
 WDTCTL=WDT_ADLY_16;
 IE1|=WDTIE;
}
#pragma vector=WDT_VECTOR
interrupt void WDT_ISR(void)
{
 Key_SM();
}

void Key_SM() //状态机建模。。
{
 static unsigned char State=0;
 static unsigned char key_now=0;
 unsigned char key_past=0;
 unsigned char key_dect=0;
 key_past=key_now;
 if(P1IN&BIT3) key_now=1;
 else key_now=0;
 if((key_now==0)&&(key_past==1)) key_dect=1;
 if((key_now==1)&&(key_past==0)) key_dect=2;

    switch(State)
    {
    case IDLE: if(key_dect==1)
                {State=SHORT;P13_OnShortRelease();}break;

    case SHORT: if(key_dect==2)
    {
     State=IDLE;
     P13_OnShortRelease();
    }
    if(LongClick_Dect())
    {
     State=LONG;
     P13_OnLongClick();
    }
    case LONG: WDT_Counter=0;
          if(key_dect==2) State=IDLE;
    default:State=IDLE;break;

    }

}

unsigned char LongClick_Dect()
{
 WDT_Counter++;
 if(WDT_Counter==COUNTER_THRESHOLD)
 {

  WDT_Counter=0;
  return 1;
 }
 else return(0);
}
void P13_OnShortRelease()
{
 P1OUT^=BIT0;
}
void P13_OnLongClick(unsigned int i)
{

     P1OUT^=BIT6;//p1.6取反

}

把程序烧进单片机中，发现只能识别短按，长按识别不出来。想了一下，不知道什么问题。。。纠结，最后试着把长按的程序处理程序换成

 while(1)
 {
 P1OUT^=BIT0;
    P1OUT^=BIT6;
 i=50000;
 while(i--);
 }