NotesUESTC/硬件开发笔记/USB相关/嵌入式USB开发.md

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## 嵌入式USB开发
一、STM32的USB开发
USB的数据传输主要是D+和D-对于D+需要使用上拉电阻。一般采用1.5K的上拉电阻即可。
二、CH340的USB开发
USB的D+和D-在连接CH340的时候是不需要上拉电阻推测CH340等串口转USB的芯片是内置了上拉电阻。