Question

1. write a program for the msp430fr6989 that will light LED1, whenever S1 is pressed. It should turn off whenever S1 is released. 2. Write a program that will make LED1 blink 5 times when S1 is pressed, and then stop.

Answer 1

1.

#include <msp430fr6989.h> // For the M430FR6989 chip,

void main(void)

{

        WDTCTL = WDTPW + WDTHOLD;               // Stop watchdog timer

        P1REN |= 0x08;                          //Turn on PullUp on????? How do you turn it off?

        P1DIR &= ~BIT3;                         // Push Port 1 P1.3 (push button) as input

        //P1OUT &= 0x08;                         // Pull down resistor???

        P1DIR |= BIT6;                          // Set (LED) to output direction

        P1SEL &= ~(BIT3 | BIT6);                // Select (push button)

        

        P1OUT &= ~BIT6;                         // Set the LED off

        int value = P1IN & BIT3;

        while( 1 ) {

                if( value == 0)         // Push button down when bit 3 == 0

                        P1OUT |= BIT6;          // Set LED on when button down

                else

                        P1OUT &= ~BIT6;         // Set LED off when button off

        }

}

2.

#include <msp430fr6989.h>

int main(void) {

volatile int i;

// stop watchdog timer

WDTCTL = WDTPW | WDTHOLD;

// set up bit 0 of P1 as output

P1DIR = 0x01;

// intialize bit 0 of P1 to 0

P1OUT = 0x00;

// loop forever

for (;;) {

// toggle bit 0 of P1

P1OUT ^= 0x01;

// delay for a while

for (i = 0; i < 0x6000; i++);

}

}