#include <stdio.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "driver/gpio.h"

//Using an array to define all of the LEDs. Keeps code short. (JI)
int ledArray[8] = {47, 48, 45, 0, 35, 36, 37, 38}; 

//Function Declarations
void initialize_gpio(); //When called, all LEDs will be set as outputs. (JI)
void printbin8(uint8_t valu); //When called, the value of the condition passed will be stored as an 8-bit unsigned integer. (JI)

void app_main() {

initialize_gpio(); //Initliazing LEDs as outputs. This is only done once. (JI)

//While-loop is required in order to iterate through each binary number on the counter, as well as have its associated LED turn on. (JI)
  while (1) {
    
    uint8_t count = 0b00000001; // Start with first LED on
    

        // Move left (shifting left)
        for (int i = 0; i < 8; i++) {
            printf("\nThe value of %d in binary is: 0b", count);
              printbin8(count);

            for (int k = 0; k < 8; k++) {
              gpio_set_level(ledArray[k], 0);
            }

            for (int k = 0; k < 8; k++) {
              if (count & (1 << k)) {
              gpio_set_level(ledArray[k], 1);

            }

            }

            vTaskDelay(pdMS_TO_TICKS(800));

            if (i < 7) {
              count <<= 1;
            }
            
            
        
        }
      
         // Now shift right (left to right movement)
      

        for (int i = 0; i < 8; i++) {
            printf("\nThe value of %d in binary is: 0b", count);
            printbin8(count);
            
            // Turn off all LEDs
            for (int k = 0; k < 8; k++) {
                gpio_set_level(ledArray[k], 0);
            }

        for (int k = 0; k < 8; k++) {
          if (count & (1 << k)) {
            gpio_set_level(ledArray[k], 1);
          }
        }

            vTaskDelay(pdMS_TO_TICKS(800));
            if (i < 7) {
            count >>= 1;  // Shift right
            }
        }
    }
}



//Function Definitions (JI)

//Function defintion to intialize all LEDs as outputs. (JI)
void initialize_gpio() {
  for (int i = 7; i >= 0; i--) {
    gpio_set_direction(ledArray[i], GPIO_MODE_OUTPUT); //Setting all LEDs as outputs. (JI)
  }
}

//Function definition for the binary counter. (JI)
void printbin8(uint8_t valu) { //This is a function which will print the value of an 8-bit unsigned integer when called. (JI)
    for (int i = 7; i >= 0; i--) {  //For-loop structure ensures we are printing from MSB to LSB and not exceeding 8 bits. (JI)
        printf("%u", (valu >> i) & 1); //The value of 'valu' is right-shifted by 'i' from the for-loop. (JI)
    }
}