아두이노에 FreeRTOS 올리고 frBlink 예제 실행하기

https://github.com/greiman/FreeRTOS-Arduino에 접속해서 다운로드를 한다. 해당 파일을 아두이노 라이브러리 폴더로 넣는다

 

 

해당 라이브러리를 옮기면, 제공하는 예제 파일들을 실행시킬 수 있다 

 

 

가장 처음의 frBlink 예제를 실행시켜서 업로드를 해보자. 200ms 주기로 LED가 깜빡이는 모습을 볼 수 있다

 

	/*
	* Example to demonstrate thread definition, semaphores, and thread sleep.
	*/
	#include <FreeRTOS_AVR.h>
	// The LED is attached to pin 13 on Arduino.
	const uint8_t LED_PIN = 13;
	// Declare a semaphore handle.
	SemaphoreHandle_t sem;
	//------------------------------------------------------------------------------
	/*
	* Thread 1, turn the LED off when signalled by thread 2.
	*/
	// Declare the thread function for thread 1.
	static void Thread1(void* arg) {
	while (1) {
	// Wait for signal from thread 2.
	// 내놓아진 세마포어를 취득
	xSemaphoreTake(sem, portMAX_DELAY);
	// Turn LED off.
	digitalWrite(LED_PIN, LOW);
	}
	}
	//------------------------------------------------------------------------------
	/*
	* Thread 2, turn the LED on and signal thread 1 to turn the LED off.
	*/
	// Declare the thread function for thread 2.
	static void Thread2(void* arg) {
	// 우선순위가 큰 쓰레드, 메인 쓰레드가 된다
	while (1) {
	// Turn LED on.
	digitalWrite(LED_PIN, HIGH);
	// Sleep for 200 milliseconds.
	vTaskDelay((200L * configTICK_RATE_HZ) / 1000L);
	// Signal thread 1 to turn LED off.
	// 세마포어를 주면서 제어권을 Thread1으로
	xSemaphoreGive(sem);
	// Sleep for 200 milliseconds.
	vTaskDelay((200L * configTICK_RATE_HZ) / 1000L);
	}
	}
	//------------------------------------------------------------------------------
	void setup() {
	portBASE_TYPE s1, s2;
	Serial.begin(9600);
	pinMode(LED_PIN, OUTPUT);
	// initialize semaphore
	sem = xSemaphoreCreateCounting(1, 0);
	// create task at priority two
	s1 = xTaskCreate(Thread1, NULL, configMINIMAL_STACK_SIZE, NULL, 2, NULL);
	// create task at priority one
	s2 = xTaskCreate(Thread2, NULL, configMINIMAL_STACK_SIZE, NULL, 1, NULL);
	// check for creation errors
	if (sem== NULL || s1 != pdPASS || s2 != pdPASS ) {
	Serial.println(F("Creation problem"));
	while(1);
	}
	// start scheduler
	vTaskStartScheduler();
	Serial.println(F("Insufficient RAM"));
	while(1);
	}
	//------------------------------------------------------------------------------
	// WARNING idle loop has a very small stack (configMINIMAL_STACK_SIZE)
	// loop must never block
	void loop() {
	// Not used.
	}

view raw freertos_intro.c hosted with ❤ by GitHub

 

[참고] https://webnautes.tistory.com/599?category=754912