Given the C program below, change the program to where the Blue LED toggles inst

Question

Given the C program below, change the program to where the Blue LED toggles instead of the Red LED.

The Program:

#include <MKL25Z4.h>

extern void asm_main (void);

#define PORTB_CLK_MASK (1UL << 10)

#define PORTn_GPIO_MASK (1UL << 8)

#define RED_MASK (1UL << 18)

void delay (int del_val) // Step 4: Delay loop

{

while (del_val >= 0) {

del_val --;

}

}

/*---------------------------------------------------------------

MAIN function

*---------------------------------------------------------------*/

int main (void) {

// Uncomment asm_main () to use

// the assembly language program in asm_main.s

// asm_main ();

// Step 1: Turn on the clock for GPIOB

SIM->SCGC5 = SIM -> SCGC5 | PORTB_CLK_MASK;

// Step 2: Configure the red LED's pin for GPIO

PORTB->PCR [18] = PORTn_GPIO_MASK;

// Step 3: Set the direction of the GPIO pin

FPTB->PDDR = FPTB->PDDR | RED_MASk;

while (1) {

delay (5000000);

// Step 5: Toggle LED

FPTB -> PTOR = FPTB->PTOR | RED_MASK;

}

}

Explanation / Answer

#include <MKL25Z4.h>

extern void asm_main (void);

#define PORTB_CLK_MASK (1UL << 10)

#define PORTn_GPIO_MASK (1UL << 8)

#define BLUE_MASK (1UL << 18)

void delay (int del_val) // Step 4: Delay loop

{

while (del_val >= 0) {

del_val --;

}

}

/*---------------------------------------------------------------

MAIN function

*---------------------------------------------------------------*/

int main (void) {

// Uncomment asm_main () to use

// the assembly language program in asm_main.s

// asm_main ();

// Step 1: Turn on the clock for GPIOB

SIM->SCGC5 = SIM -> SCGC5 | PORTB_CLK_MASK;

// Step 2: Configure the BLUE LED's pin for GPIO

PORTB->PCR [18] = PORTn_GPIO_MASK;

// Step 3: Set the direction of the GPIO pin

FPTB->PDDR = FPTB->PDDR | BLUE_MASk;

while (1) {

delay (5000000);

// Step 5: Toggle LED

FPTB -> PTOR = FPTB->PTOR | BLUE_MASK;

}

}

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