Question

1. IN C LANGUAGE: Write a code that makes the MSP430 blink the red LED and the green LED at the same time. The two LEDs should be on at the same time and then off at the same time

Answer 1

#include  <msp430g2553.h>

 unsigned int i = 0;                         // Initialize variables. This will keep count of how many cycles between LED toggles


void main(void)
{
  WDTCTL = WDTPW + WDTHOLD;                 // Stop watchdog timer. This line of code is needed at the beginning of most MSP430 projects. 
                                            // This line of code turns off the watchdog timer, which can reset the device after a certain period of time.

  P1DIR |= 0x01;                            // P1DIR is a register that configures the direction (DIR) of a port pin as an output or an input. 


                                            // To set a specific pin as output or input, we write a '1' or '0' on the appropriate bit of the register.


                                            // P1DIR = <PIN7><PIN6><PIN5><PIN4><PIN3><PIN2><PIN1><PIN0>


                                            // Since we want to blink the on-board red LED, we want to set the direction of Port 1, Pin 0 (P1.0) as an output

                                            // We do that by writing a 1 on the PIN0 bit of the P1DIR register
                                            // P1DIR = <PIN7><PIN6><PIN5><PIN4><PIN3><PIN2><PIN1><PIN0>
                                            // P1DIR = 0000 0001
                                            // P1DIR = 0x01     <-- this is the hexadecimal conversion of 0000 0001



  for (;;)                                  // This empty for-loop will cause the lines of code within to loop infinitely
  {



    P1OUT ^= 0x01;                          // Toggle P1.0 using exclusive-OR operation (^=)

                                            // P1OUT is another register which holds the status of the LED. 
                                            // '1' specifies that it's ON or HIGH, while '0' specifies that it's OFF or LOW
                                            // Since our LED is tied to P1.0, we will toggle the 0 bit of the P1OUT register



    for(i=0; i< 20000; i++);                // Delay between LED toggles. This for-loop will run until the condition is met. 
                                            //In this case, it will loop until the variable i increments to 20000.
  }

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#include <msp43092553.h> unsigned int i = 0; 1/ Initialize variables. This will keep count of how many cycles between LED toggles void main(void) { WDTCTL = WDTPW + WDTHOLD; 1 Stop watchdog timer. This line of code is needed at the beginning of most MSP430 projects. // This line of code turns off the watchdog timer, which can reset the device after a certain period of time. // PIDIR is a register that configures the direction (DIR) of a port pin as an output or an input. PIDIR = Ox01; 1/ To set a specific pin as output or input, we write a 'l' or 'o' on the appropriate bit of the register. // PIDIR = <PIN7><PIN6><PIN"><PIN4><PIN3><PIN2><PINI><PINO> // Since we want to blink the on-board red LED, we want to set the direction of Port 1, Pino (P1.0) as an output // We do that by writing a 1 on the PINO bit of the PIDIR register // PIDIR = <PIN7><PIN6><PIN5><PIN4><PIN3><PIN2><PINI><PINO> // PIDIR = 0000 0001 // PIDIR = Ox01 <-- this is the hexadecimal conversion of 0000 0001 for (;;) { // This empty for-loop will cause the lines of code within to loop infinitely

PLOUT ^= Ox01; // Toggle P1.0 using exclusive-OR operation (=) // PIOUT is another register which holds the status of the LED. // '1' specifies that it's On or HIGH, while 'o' specifies that it's OFF or LOW // Since our LED is tied to P1.0, we will toggle the 0 bit of the plout register for(i=0; i< 20000; i++); // Delay between LED toggles. This for-loop will run until the condition is met. // In this case, it will loop until the variable i increments to 20000. }