There are three methods for integrating C and RTOS in embedded systems: Interrupt-free method: C code is separated from RTOS scheduling and gives up real-time performance. Cooperative multitasking: C tasks interact with the RTOS, incurring context switching overhead. Preemptive multitasking: C tasks are scheduled by the RTOS, providing optimal real-time performance.
Integration of C and RTOS in embedded systems
Integration of C and real-time operating system (RTOS) in embedded systems For Improving performance and reliability is critical. This article introduces several methods of integrating C and RTOS and provides a practical case.
Method:
Practical case:
Consider an embedded system that needs to display a message on an LED while responding to a button press. The following example of writing C code using FreeRTOS and cooperative multitasking:
#include "FreeRTOS.h" #include "task.h" // 任务函数:显示消息 static void displayTask(void *pvParameters) { while (true) { // 显示消息 printf("Hello, world!\n"); // 等待下一次调用 vTaskSuspend(NULL); } } // 任务函数:处理按钮按下 static void buttonTask(void *pvParameters) { while (true) { // 轮询按钮 if (isButtonDown()) { // 通知显示任务显示消息 xTaskResumeFromISR(displayTask); } // 延时 vTaskDelay(100); } } int main() { // 创建显示任务 xTaskCreate(displayTask, "Display", 256, NULL, 1, NULL); // 创建按钮任务 xTaskCreate(buttonTask, "Button", 128, NULL, 2, NULL); // 启动任务调度器 vTaskStartScheduler(); return 0; }
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