Question

**Keil uVision5 - ARM Cortex M0+ - Embedded C programming

Modify the program below so that the Red, Green, and Blue LEDs are switched ON and OFF in a sequence with one second delay for Red and Green LEDs, and 0.5 second delay for the Blue LED.

 #include "MKL25Z4.h"
        
        void delay(int n);
        int main (void) {
                        
        SIM_SCGC5 |= SIM_SCGC5_PORTB(1); /* enable clock to Port B */
        PORTB_PCR18 |=PORT_PCR_MUX(1);   /* Configure PORTB ,pin 18 as GPIO ; set MUX*/
        GPIOB_PDDR=(1UL << 18);    /* make PORTB ,pin 18 as output pin */
        
                while (1) {
  GPIOB_PCOR = (1UL << 18);               /* turn ON Red LED for one sec */
        delay(10);
        GPIOB_PSOR = (1UL << 18);         /* turn OFF Red LED for one sec*/
        delay(10);
                }
        }
        /* Delay function for 100 ms    */
        
        void delay(int n) {
  int i,j;
        for(i = 0 ; i < n; i++)
        for (j = 0; j < 349500; j++) {}
        }

Answer 1

#include "MKL25Z4.h   

        void delay(int n);

        int main (void) {

        SIM_SCGC5 = SIM_SCGC5_PORTB(1);

        PORTB_PCR18 =PORT_PCR_MUX(1);

        GPIOB_PDDR=(1UL << 18);   

while (1) {{

     GPIOB_PCOR = (1UL << 18);              

        delay(10);

        GPIOB_PSOR = (1UL << 18);       

        delay(10);

                }

                {

     GPIOB_PCOG = (1UL << 18);              

        delay(10);

        GPIOB_PSOG = (1UL << 18);       

        delay(10);

                }

                {

     GPIOB_PCOB = (1UL << 18);              

        delay(5);

        GPIOB_PSOB = (1UL << 18);       

        delay(5);

                }

}

        }

        void delay(int n) {

int i,j;

        for(i = 0 ; i < n; i++)

        for (j = 0; j < 60; j++)

{delay(60);

return;

}

        }