Notes/嵌入式USB开发.md at a449ba163d412987fe0a02660099ba9e38b4b8a8 - Notes - 深安实验室Git服务器

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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。