MSP-EXPG2

GPIO

• 方向寄存器 PxDIR
• 输出 PxOUT
• 输入 PxIN
• 输入上下拉 PxREN
• 端口复用 PxSEL：PxSEL1

中断

• 标记 P1IFG
• 允许 P1IE
• 

#include <msp430.h> 


/**
 * main.c
 */
int main(void)
{
	WDTCTL = WDTPW | WDTHOLD;	// stop watchdog timer
	//LED 闪烁   产生中断后另一个灯闪烁
	//初始化
	P1DIR=BIT0+BIT6;   //P1.0   P1.6
	P1OUT = BIT3;
	P1REN |= BIT3;                            // P1.3 pullup
	P1IE |= BIT3;                             // P1.3 interrupt enabled
	P1IES |= BIT3;                            // P1.3 Hi-low edge
	P1IFG &= ~BIT3;                           // P1.3 IFG cleared
	_BIS_SR(GIE);     // Enable global interrupt
	while(1)
	{
	    P1OUT|=BIT0;
	    _delay_cycles(500000);
	    P1OUT&=(~BIT0);
	    _delay_cycles(500000);
	}
	return 0;
}


#pragma vector=PORT1_VECTOR
__interrupt void Port_1(void)
{
  P1OUT ^= BIT6;                            // P1.0 = toggle
  P1IFG &= ~0x08;                           // Clear P1.3 IFG
}