main.c

本代码是关于利用IAR编译环境

#include "io430.h"
char Key_Pressed(void);
void Led_Flash(void);
//用P1.0来控制闪烁 用P1.1控制频率 
int main( void )
{ 
  //unsigned int i;
  unsigned char time,delay,i;
  // Stop watchdog timer to prevent time out reset
  WDTCTL = WDTPW + WDTHOLD;
  P1DIR&=~BIT2;
  P1SEL|=BIT0;
  P1OUT|=BIT0;
  while(1)
  {
    if(Key_Pressed())
      time=(time+1)&4;
    switch(time)
    {
    case 0:delay=2;
           break;
    case 1:delay=3;
           break;
    case 2:delay=5;
           break;        
    case 3:delay=7;
           break;
    default:break;
    }
  for(i=0;i<delay;i++)
    Led_Flash();
  
  }

}

void Led_Flash(void)
{
  unsigned char i;
  
  for(i=0;i<2000;i++)
    P1OUT ^=BIT0;
}

char Key_Pressed(void)
{
  unsigned int i;
  while(!P1IN&BIT2);
  for (i=0;i<8000;i++);
  if(P1IN&BIT2)
    return 1;
  else
    return 0;
}