RTOS 笔记
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记录 RTOS 相关的笔记和代码片段，主要为 FreeRTOS 和 lwIP 的使用，平台为 stm32、esp32
或仿真平台。

* https://github.com/lsgunth/lwip_contrib

  Zero-copy LWIP driver for stm32f2x7 and a few useful apps.

* https://github.com/MaJerle/stm32-usart-uart-dma-rx-tx

  STM32 examples for USART using DMA for efficient RX and TX transmission