# MSP430G2553 switch to light up the LED

# MSP430G2553 switch to light up the LED

This is my first blog post. If there is any irregularity, I hope you can point it out. Recently I started learning MSP430G2553, and I will share with you the problems encountered in learning and learning results. What I shared with you today is a section that turns on the LEDs on the two boards by pressing the button P1.3 to switch cyclically.

#include <msp430.h> 

/*
 * main.c
 */
int main(void)
{
    
    
    WDTCTL = WDTPW | WDTHOLD;	// Stop watchdog timer
	P1DIR |=BIT6;                //LED2——P1.6设为输出
	P1OUT &=~BIT6;               //初始化P1.6为低电平，LED2灭
	P1DIR |=BIT0;                //LED1——P1.0设为输出
	P1OUT |=BIT0;                //初始化P1.0为低电平，LED1亮
	P1DIR &=~BIT3;                //按键——P1.3设为输入
	P1REN |=BIT3;                //Enable internal pull-up resistor
	P1OUT |=BIT3;                //Set pull-up resistor for P1.3
	while(1)
	{
    
    
		if((P1IN&BIT3)==0)
		{
    
    
			
			DCOCTL = CALDCO_16MHZ; //设置MCLK频率为16MHZ
			BCSCTL1 = CALBC1_16MHZ;
			P1OUT ^=BIT6;
            P1OUT ^=BIT0;
            __delay_cycles(8000000);  //延时 8M*(1/16M)秒
		}

	}
}

The following video is the corresponding key control and phenomenon.

LED switch on