#include <Arduino_FreeRTOS.h>
#include <semphr.h>

#define redled 3  
#define yellowled 4
#define greenled 5  

SemaphoreHandle_t xBinarySemaphore;

void setup() 
{
    Serial.begin(9600);
    
    // Initialize LED pins
    pinMode(redled, OUTPUT);
    pinMode(yellowled, OUTPUT);
    pinMode(greenled, OUTPUT);
    
    
    xBinarySemaphore = xSemaphoreCreateBinary();
    
    
    xSemaphoreGive(xBinarySemaphore);
    
  
    xTaskCreate(Taskredled, "redled", 100, NULL, 1, NULL);
    xTaskCreate(Taskyellowled, "yellowled", 100, NULL, 1, NULL);
    xTaskCreate(Taskgreenled, "greenled", 100, NULL, 1, NULL);
}

void loop()
 {
    // Empty loop as tasks are running in FreeRTOS
}

void Taskredled(void *pvParameters) 
{
    while (1)
     {
        if (xSemaphoreTake(xBinarySemaphore, portMAX_DELAY))
         {
            for (int i = 0; i < 5; i++) 
            {
                digitalWrite(redled, HIGH);
                vTaskDelay(500 / portTICK_PERIOD_MS); 
                digitalWrite(redled, LOW);
                vTaskDelay(500 / portTICK_PERIOD_MS); 
            }
            xSemaphoreGive(xBinarySemaphore);
        }
        vTaskDelay(10 / portTICK_PERIOD_MS); 
    }
}

void Taskyellowled(void *pvParameters) // Small delay to prevent busy waiting
 {
    while (1) 
    {
        if (xSemaphoreTake(xBinarySemaphore, portMAX_DELAY)) 
        {
            for (int i = 0; i < 5; i++) 
            {
                digitalWrite(yellowled, HIGH);
                vTaskDelay(500 / portTICK_PERIOD_MS); 
                digitalWrite(yellowled, LOW);
                vTaskDelay(500 / portTICK_PERIOD_MS); 
            }
            xSemaphoreGive(xBinarySemaphore);
        }
        vTaskDelay(10 / portTICK_PERIOD_MS); 
    }
}

void Taskgreenled(void *pvParameters) 
{
    while (1) {
        if (xSemaphoreTake(xBinarySemaphore, portMAX_DELAY))
         {
            for (int i = 0; i < 5; i++) 
            {
                digitalWrite(greenled, HIGH);
                vTaskDelay(500 / portTICK_PERIOD_MS); 
                digitalWrite(greenled, LOW);
                vTaskDelay(500 / portTICK_PERIOD_MS); 
            }
            xSemaphoreGive(xBinarySemaphore);
        }
        vTaskDelay(10 / portTICK_PERIOD_MS);
    }
}