1. Task-Related APIs Function Purpose xTaskCreate() Create a task vTaskDelete() Delete a task (NULL can be passed to delete itself) vTaskSuspend() Suspend a task (NULL can be passed to suspend itself) vTaskResume() Resume a task vTaskDelay() Delay (block the task for a period) vTaskDelayUntil() Periodic delay (ensure constant period) uxTaskPriorityGet() Get task priority vTaskPrioritySet() Set … Read more
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In the embedded field, embedded real-time operating systems are becoming increasingly widely used. Using an embedded real-time operating system (RTOS) can more reasonably and effectively utilize CPU resources, simplify application software design, shorten system development time, and better ensure the system’s real-time performance and reliability. FreeRTOS is a mini real-time operating system kernel. As a … Read more
Transitioning from bare-metal (front-back architecture) software development to using a Real-Time Operating System (RTOS) can be a challenging task. However, there are many advantages to using an RTOS, such as simplifying application integration and supporting task preemption scheduling. This becomes meaningful when developers use complex 32-bit microcontrollers and have sufficient Flash and RAM space. Many … Read more
BitBake is a powerful build tool primarily used for building embedded Linux systems, playing a core role in the Yocto Project. It is not just a simple build tool but a complete task execution engine capable of handling complex dependencies and build processes. Basic Concepts BitBake uses specific configuration files (.bb files) to describe how … Read more
1. Basic Concepts In the context of the entire microcontroller program, we refer to it as an application. When using FreeRTOS, we can create multiple tasks within the application; some documents refer to tasks as threads. For example, in daily life, a mother may need to do two things at the same time: Feeding: This … Read more
In FreeRTOS, Cooperative Scheduling and Preemptive Scheduling are two different task scheduling algorithms. The core difference between them lies in the triggering mechanism for task switching and how task priorities are handled. 1. Cooperative Scheduling 1.1 Concept Cooperative Scheduling is a non-preemptive scheduling algorithm. In cooperative scheduling mode, task switching only occurs when a task … Read more
Dian Dian Xia wants to learn about RTOS, but doesn’t know where to start, sigh.Real-Time Operating Systems? I’m familiar with them, let me explain slowly.Ke Ke Jun Real-Time Operating Systems (RTOS) are widely used in consumer electronics, entertainment products, home appliances, industrial equipment, medical instruments, military weapons, and scientific research equipment. They play a critical … Read more
1. What Is the Task State Machine Model? The task state machine model describes the lifecycle and state transitions of a task. Typical states include: (1) Ready: The task can execute but is waiting for the scheduler to allocate CPU. (2) Running: The task is currently using the CPU to execute. (3) Blocked: The task … Read more
1. The Concepts of Synchronization and Mutual Exclusion To understand synchronization and mutual exclusion in one sentence: I wait for you to finish using the bathroom before I use it. What is synchronization? It is: Hey, I am using the bathroom, please wait. What is mutual exclusion? It is: Hey, I am using the bathroom, … Read more