/*
    实验说明：中断唤醒睡眠实验，分别介绍三种睡眠模式下的唤醒
*/

#include <ioCC2430.h>
#define LED_ON  0
#define LED_OFF 1#define led1 P1_0          
#define led2 P1_1          
#define led3 P1_2          
#define led4 P1_3    

/*系统时钟初始化
-------------------------------------------------------*/
void xtal_init(void)
{
  SLEEP &= ~0x04;             //都上电
  while(!(SLEEP & 0x40));     //晶体振荡器开启且稳定
  CLKCON &= ~0x47;          //选择32MHz 晶体振荡器
  SLEEP |= 0x04;
}


/*LED初始化
-------------------------------------------------------*/
void led_init(void)
{
  P1SEL  = 0x00;          //P1为普通 I/O 口
  P1DIR |= 0x0F;          //P1.0 P1.1 P1.2 P1.3 输出
  
  led1 = LED_OFF;         //关闭所有LED
  led2 = LED_OFF;
  led3 = LED_OFF;
  led4 = LED_OFF;
}


/*外部中断初始化
-------------------------------------------------------*/
void io_init(void)
{
    P0INP &= ~0X02;   //P0.1有上拉、下拉

    EA = 1;           //总中断允许
    
    IEN1  |=  0X20;   // P0IE = 1，P0中断使能
    
    PICTL |=  0X09;   //P0.1允许中断，下降沿触发
    
    P0IFG &= ~0x02;   //P0.1中断标志清0
}


/*睡眠定时器中断初始化
-------------------------------------------------------*/
void sleepTimer_init(void)
{
  STIF=0;   //睡眠定时器中断标志清0
   
  STIE=1;   //开睡眠定时器中断
    
  EA=1;     //开总中断
}


/*设置睡眠定时器的定时间隔
-------------------------------------------------------*/
void setSleepTimer(unsigned int sec)
{
  unsigned long sleepTimer = 0;
  
  sleepTimer |= ST0;                      //取得目前的睡眠定时器的计数值
  sleepTimer |= (unsigned long)ST1 << 8;
  sleepTimer |= (unsigned long)ST2 << 16;
  
  sleepTimer += ((unsigned long)sec * (unsigned long)32768);   //加上所需要的定时时长
  
  ST2 = (unsigned char)(sleepTimer >> 16);   //设置睡眠定时器的比较值
  ST1 = (unsigned char)(sleepTimer >> 8); 
  ST0 = (unsigned char)sleepTimer;
}


/*选择电源模式
-------------------------------------------------------*/
void PowerMode(unsigned char mode)
{
  if(mode<4)
  {
    SLEEP &= 0xfc;       //将SLEEP.MODE清0
    SLEEP |= mode;       //选择电源模式
    PCON |= 0x01;        //启用此电源模式
  }
}


/*延时函数
-------------------------------------------------------*/
void Delay(unsigned int n)
{
  unsigned int i,j;
  for(i=0;i<n;i++)
    for(j=0;j<1000;j++);
}

/*主函数
-------------------------------------------------------*/
void main(void)
{ 
  xtal_init();         
  led_init();          
  
  //PM0状态，亮灯并延时
  led1 = LED_ON;         //亮LED1，表示统在PM0模式工作
  Delay(10);


  //PM1状态，灭灯
  setSleepTimer(1);      //设置睡眠定时器的定时间隔为1s
  sleepTimer_init();     //开睡眠定时器中断
  led1 = LED_OFF;
  PowerMode(1);          //设置电源模式为PM1
  
  //1s后，由PM1进入PM0，亮灯并延时
  led1 = LED_ON;
  Delay(50);
  
  //PM2，灭灯
  setSleepTimer(2);      //设置睡眠定时器的定时间隔为2s
  led1 = LED_OFF;
  PowerMode(2);          //设置电源模式为PM2


  //2s后，由PM2进入PM0，亮灯并延时
  led1=0;
  Delay(50); 
  
  //PM3，灭灯  
  io_init();             //初始化外部中断
  led1 = LED_OFF;
  PowerMode(3);          //设置电源模式为PM3
  
  //当外部中断发生时，由PM3进入PM0，亮灯
  led1 = LED_ON;

  while(1);
}

/*外部中断服务程序
-------------------------------------------------------*/
#pragma vector = P0INT_VECTOR
__interrupt void P0_ISR(void)
{
  EA = 0;                         //关中断
  
  Delay(50);

  if((P0IFG & 0x02 ) >0 )         //按键中断
  {
    P0IFG &= ~0x02;               //P0.1中断标志清0
  }
  P0IF = 0;                       //P0中断标志清0


  EA = 1;                         //开中断
}


/*睡眠定时器中断服务程序
-------------------------------------------------------*/
#pragma vector= ST_VECTOR
__interrupt void sleepTimer_IRQ(void)
{
  EA=0;     //关中断
   
  STIF=0;   //睡眠定时器中断标志清0
  
  EA=1;     //开中断
}

  unsigned long sleepTimer = 0;
  
  sleepTimer |= ST0;                      //取得目前的睡眠定时器的计数值
  sleepTimer |= (unsigned long)ST1 << 8;
  sleepTimer |= (unsigned long)ST2 << 16;

  sleepTimer += ((unsigned long)sec * (unsigned long)32768);   //加上所需要的定时时长

  ST2 = (unsigned char)(sleepTimer >> 16);   //设置睡眠定时器的比较值
  ST1 = (unsigned char)(sleepTimer >> 8); 
  ST0 = (unsigned char)sleepTimer;