Question

using code composer studio 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>

#define LED_0 BIT0 
#define LED_OUT P1OUT
#define LED_DIR P1DIR
#define BUTTON BIT3

unsigned int blink = 0;

void main(void)
{

WDTCTL = WDTPW + WDTHOLD; // Stop watchdog timer
LED_DIR |= (LED_0); // Set P1.0  to output direction
LED_OUT &= ~(LED_0); // Set the LEDs off

P1REN |= BUTTON; // puller-Resistor on the button-pin is enabled
P1OUT |= BUTTON; //Writes a "1" to the portpin
P1IES |= BUTTON; //Triggers when you PRESS the button 

P1IE |= BUTTON;

__enable_interrupt(); // Interrupts get enabled

for (;;)
{

if(blink > 0)
{
P1OUT ^= (LED_0); // on P1.0 

}
}

} 

// Port 1 interrupt service routine
#pragma vector=PORT1_VECTOR
__interrupt void Port_1(void)
{
blink ^= 0x01;
P1IFG &= ~BUTTON; // P1.3 IFG cleared
LED_OUT &= ~(LED_0); // Clear the LED

}

2) Write a program that will make LED1 blink 5 times when S1 is pressed, and then stop.

#include <msp430fr6989.h>

#define LED_0 BIT0 
#define LED_OUT P1OUT
#define LED_DIR P1DIR
#define BUTTON BIT3

unsigned int blink = 0;

void main(void)
{

WDTCTL = WDTPW + WDTHOLD; // Stop watchdog timer
LED_DIR |= (LED_0); // Set P1.0  to output direction
LED_OUT &= ~(LED_0); // Set the LEDs off

P1REN |= BUTTON; // puller-Resistor on the button-pin is enabled
P1OUT |= BUTTON; //Writes a "1" to the portpin
P1IES |= BUTTON; //Triggers when you PRESS the button 

P1IE |= BUTTON;

__enable_interrupt(); // Interrupts get enabled

for (;;)
{

if(blink > 0)
{
P1OUT ^= (LED_0); // on P1.0 

__delay_cycles(10000)

LED_OUT &= ~(LED_0)

P1OUT ^= (LED_0); // on P1.0 

__delay_cycles(10000)

LED_OUT &= ~(LED_0)

P1OUT ^= (LED_0); // on P1.0 

__delay_cycles(10000)

LED_OUT &= ~(LED_0)

P1OUT ^= (LED_0); // on P1.0 

__delay_cycles(10000)

LED_OUT &= ~(LED_0)

P1OUT ^= (LED_0); // on P1.0 

__delay_cycles(10000)

LED_OUT &= ~(LED_0)

}
}

} 

// Port 1 interrupt service routine
#pragma vector=PORT1_VECTOR
__interrupt void Port_1(void)
{
blink ^= 0x01;
P1IFG &= ~BUTTON; // P1.3 IFG cleared
LED_OUT &= ~(LED_0); // Clear the LED

}