IOT operating system

Internet of things operating system

How to select the operating system of the Internet of things

IOT security 、 Open source 、 Development costs 、 The real time 、 efficiency （cpu Occupancy rate 、 Memory usage ） 、 Market share .

We use FREERTOS Understand the Internet of things platform .

Learning notes

1. operating system 、 Understand C Language to understand common data structures 、 stay MCU Developed on .

RTOS operating system

Real Time OS Real-time operating system ;

The real time ： Hard real time ： Timeout is not allowed . Soft real time ： Not too strict about timeout .

operating system ： A software that provides management and coordination of system tasks .

terminal ： Run with specific embedded hardware , The function can be tailored 、 Code portability .

RTOS At the heart of

RTos The core is task scheduling , Select communication through interactive components and various tasks .

Multiple workflows

A physics CPU adopt RTOS Simulate multiple virtual machines CPU Execute tasks to improve efficiency. Every task is a main;

int main(){
	for()
	{
	}
}

FREERTOS Working components

Resource access control ：

Semaphore 、 The mutex 、 Critical section

Message communication ：

Message queue 、 Event signs

Storage management ：

Memory block

RTOS Characteristics

1. Make efficient use of CPU

2. Real time processing mechanism

3. Common task management framework

Transplantation of operating system

FREERTOS Source structure

CMSIS_RTOS Official library files

include be-all .h file

portable >memmang Memory management related interfaces

​ ->RVDS->ARM_CM4F Hardware operation files The focus of transplantation The rest is some Component files

Use CUBEMAX Use freeRTOS Lighting

1. Clock peripheral configuration

There is no detailed explanation here

2.freeRTOS To configure

3. Task generation keil5 Source code

In the data , Comments written .https://download.csdn.net/download/ay1204/86248358