Arduino RTOS 实现多任务LED闪烁控制
Arduino是一个开源的电子原型平台，支持通过简单的硬件和软件创建互动项目。它基于C/C++语言，并拥有一个集成开发环境（IDE），用于编写、编译和上传代码到Arduino板上。
Arduino FreeRTOS概述
Arduino FreeRTOS结合了Arduino平台与FreeRTOS实时操作系统（RTOS）。FreeRTOS提供任务管理、时间管理、信号量等功能，适用于嵌入式设备，具有源码公开、可移植等优点。在Arduino RTOS中实现多任务LED闪烁
在Arduino RTOS环境中，利用多任务调度可以灵活地控制多个LED的闪烁模式，适用于状态指示、用户交互等多种场景。基本示例：多任务LED闪烁
#include <Arduino_FreeRTOS.h>
const int ledPinA = 7;
const int ledPinB = 8;
void taskA(void *pvParameters) {
pinMode(ledPinA, OUTPUT);
for (;;) {
digitalWrite(ledPinA, HIGH);
vTaskDelay(pdMS_TO_TICKS(300));
digitalWrite(ledPinA, LOW);
vTaskDelay(pdMS_TO_TICKS(300));
}
}
void taskB(void *pvParameters) {
pinMode(ledPinB, OUTPUT);
for (;;) {
digitalWrite(ledPinB, HIGH);
vTaskDelay(pdMS_TO_TICKS(600));
digitalWrite(ledPinB, LOW);
vTaskDelay(pdMS_TO_TICKS(600));
}
}
void setup() {
xTaskCreate(taskA, "Task A", 128, NULL, 1, NULL);
xTaskCreate(taskB, "Task B", 128, NULL, 1, NULL);
}
void loop() {}
优先级设置示例
#include <Arduino_FreeRTOS.h>
const int ledPinX = 5;
const int ledPinY = 6;
void taskX(void *pvParameters) {
pinMode(ledPinX, OUTPUT);
for (;;) {
digitalWrite(ledPinX, HIGH);
vTaskDelay(pdMS_TO_TICKS(400));
digitalWrite(ledPinX, LOW);
vTaskDelay(pdMS_TO_TICKS(400));
}
}
void taskY(void *pvParameters) {
pinMode(ledPinY, OUTPUT);
for (;;) {
digitalWrite(ledPinY, HIGH);
vTaskDelay(pdMS_TO_TICKS(800));
digitalWrite(ledPinY, LOW);
vTaskDelay(pdMS_TO_TICKS(800));
}
}
void setup() {
xTaskCreate(taskX, "Task X", 128, NULL, 2, NULL);
xTaskCreate(taskY, "Task Y", 128, NULL, 1, NULL);
}
void loop() {}
使用互斥锁协调资源访问
#include <Arduino_FreeRTOS.h>
SemaphoreHandle_t mutex;
void ledControl(void *pvParameters) {
const int ledPin = 9;
pinMode(ledPin, OUTPUT);
for (;;) {
if (xSemaphoreTake(mutex, portMAX_DELAY)) {
digitalWrite(ledPin, HIGH);
vTaskDelay(pdMS_TO_TICKS(200));
digitalWrite(ledPin, LOW);
vTaskDelay(pdMS_TO_TICKS(200));
xSemaphoreGive(mutex);
}
}
}
void setup() {
mutex = xSemaphoreCreateMutex();
xTaskCreate(ledControl, "LED Control Task", 128, NULL, 1, NULL);
xTaskCreate(ledControl, "Another LED Control Task", 128, NULL, 1, NULL);
}
void loop() {}
