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上次说板子烧不上代码，有少数可以，检测到jlink但是下载的时候擦除会卡住，用串口也是一样下载不到，但是有打印提示信息。链接文本，这次新发的板子也是这个问题。麻烦检查一下这部分原理图有没有问题，准备量产了谢谢
供电3.3v VDD
