FreeRTOS

FreeRTOS 是市场领先的面向微控制器和小型微处理器的实时操作系统 (RTOS)，通过 MIT 开源许可免费分发，包括一个内核和一组不断丰富的 IoT 库，适用于所有行业领域。 是在嵌入式平台中能与Linux相匹敌的操作系统，提供GPL开源许可，它特别适用于开发物联网终端设备。

FreeRTOS功能包括：任务管理、时间管理、信号量、消息队列、内存管理、记录功能、软件定时器、协程等，缺少Linux系统诸多功能如设备驱动程序、用户帐户以及高级的网络和内存管理，但它占用的资源比Linux少得多。

FreeRTOS可以在内存不到0.5KB、ROM为5-10KB的设备上运行，不过与TCP/IP架构结合使用更为常见，它更像是24KB内存和60KB闪存。FreeRTOS操作系统可以被方便地移植到不同处理器上工作，现已提供了ARM、MSP430、AVR、PIC、C8051F等多款处理器的移植。

• 更好的事件实时处理机制

• 更高效利用CPU资源

• 通用的任务管理框架

Platforms

Name	Description
CHIPS Alliance	The CHIPS Alliance develops high-quality, open source hardware designs relevant to silicon devices and FPGAs.
SiFive	SiFive brings the power of open source and software automation to the semiconductor industry, making it possible to develop new hardware faster and more affordably than ever before.

Examples

• FreeRTOS for CHIPS Alliance

• FreeRTOS for SiFive

Debugging

Debugging - “1-click” solution for debugging with a zero configuration.

Tools & Debug Probes

Supported debugging tools are listed in “Debug” column. For more detailed information, please scroll table by horizontal. You can switch between debugging Tools & Debug Probes using debug_tool option in “platformio.ini” (Project Configuration File).

Warning

You will need to install debug tool drivers depending on your system. Please click on compatible debug tool below for the further instructions.

On-Board Debug Tools

Boards listed below have on-board debug probe and ARE READY for debugging! You do not need to use/buy external debug probe.

Name	Platform	MCU	Frequency	Flash	RAM
Arty FPGA Dev Kit	SiFive	FE310	450MHz	16MB	256MB
HiFive Unleashed	SiFive	FU540	1500MHz	32MB	8GB
HiFive1	SiFive	FE310	320MHz	16MB	16KB
HiFive1 Rev B	SiFive	FE310	320MHz	16MB	16KB
RVfpga: Digilent Nexys A7	CHIPS Alliance		320MHz	16MB	1.16MB
SparkFun RED-V RedBoard	SiFive	FE310	320MHz	16MB	16KB
SparkFun RED-V Thing Plus	SiFive	FE310	320MHz	16MB	16KB

Boards

Note

• You can list pre-configured boards by pio boards command

• For more detailed board information please scroll the tables below by horizontally.

Digilent

Name	Platform	Debug	MCU	Frequency	Flash	RAM
RVfpga: Digilent Nexys A7	CHIPS Alliance	On-board		320MHz	16MB	1.16MB

SiFive

Name	Platform	Debug	MCU	Frequency	Flash	RAM
HiFive Unleashed	SiFive	On-board	FU540	1500MHz	32MB	8GB
HiFive1	SiFive	On-board	FE310	320MHz	16MB	16KB
HiFive1 Rev B	SiFive	On-board	FE310	320MHz	16MB	16KB

SparkFun

Name	Platform	Debug	MCU	Frequency	Flash	RAM
SparkFun RED-V RedBoard	SiFive	On-board	FE310	320MHz	16MB	16KB
SparkFun RED-V Thing Plus	SiFive	On-board	FE310	320MHz	16MB	16KB

Xilinx

Name	Platform	Debug	MCU	Frequency	Flash	RAM
Arty FPGA Dev Kit	SiFive	On-board	FE310	450MHz	16MB	256MB