为什么我的led灯不闪烁呢？求解 #include <msp430g2553.h>void delay(){unsigned int i;for(i=0;i<20000;i++);}void main(void){WDTCTL = WDTPW + WDTHOLD;P1DIR |= 0X41;while(1){P1OUT &= 0X00;P1OUT |= 0X41;delay();P1OUT &= 0X00;P1OUT |= 0X40;delay();P1OUT &= 0X00;P1OUT |= 0X01;delay();P1OUT &= 0X00;P1OUT |= 0X00;delay();}}为什么我的led灯不闪烁呢？初学！LaunchPad开发板