Question

Please answer using MSP design and program for C.

Write CCS code.

outline the program for MSP design, and program for C.

Make a project that uses one timer on the board to control the blinking of the LED. Basically setup a timer interupt. Whenever the timer interrupt happens, the LED blinks. The frequency of the

blinking is chosen by the user.

Next modify the program above and make a project that uses one of the pushbuttons on the board to control the frequency of the LED blinking. Essentially, choose one frequency in the timer interrupt, and then setup a button for a interrupt routine. Whenever the pushbutton interrupt occurs, the frequency of the LED blinking slows down by half until it reaches the minimum frequency. The minimum frequency

of the blinking is chosen in the previous problem so keep the same.

Again please use MSP design and have it able to program in C.

I will up vote if done correctly, thanks!

Answer 1

#include "msp430g2231.h"  
  
void main(void)
{
  WDTCTL = WDTPW + WDTHOLD;     // Stop WDT  
  CCTL0 = CCIE;                             // CCR0 interrupt enabled
  TACTL = TASSEL_2 + MC_1 + ID_3;           // SMCLK/8, upmode
  CCR0 =  10000;                     // 12.5 Hz   
  P1OUT &= 0x00;               // Shut down everything
  P1DIR &= 0x00;               
  P1DIR |= BIT0 + BIT6;            // P1.0 and P1.6 pins output the rest are input 
  P1REN |= BIT3;                   // Enable internal pull-up/down resistors
  P1OUT |= BIT3;                   //Select pull-up mode for P1.3
  P1IE |= BIT3;                       // P1.3 interrupt enabled
  P1IES |= BIT3;                     // P1.3 Hi/lo edge
  P1IFG &= ~BIT3;                  // P1.3 IFG cleared
  _BIS_SR(CPUOFF + GIE);          // Enter LPM0 w/ interrupt 
  while(1)                          //Loop forever, we work with interrupts!
  {}
} 
  
// Timer A0 interrupt service routine 
#pragma vector=TIMERA0_VECTOR 
__interrupt void Timer_A (void) 
{   
   P1OUT ^= BIT0;                          // Toggle P1.0 
} 
// Port 1 interrupt service routine
#pragma vector=PORT1_VECTOR
__interrupt void Port_1(void)
{    
   P1OUT ^= BIT6;                      // Toggle P1.6
   P1IFG &= ~BIT3;                     // P1.3 IFG cleared 
}