实时操作系统FreeRTOS API说明，对理解实时操作系统原理很有帮助，从官网上下载是要花10美刀的哦-Real-time operating system FreeRTOS API descr iption, understanding the principles of real-time operating system is helpful, from the official website to download a knife Oh take U.S. 10

freertos官方文档，api手册, 嵌入式操作系统，移植方便(FreeRTOS official document, and API manual)