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如题，谢谢。。。。。。
如题。。。。。。。。
用TTL转USB接口进行串口通信hello world的例程，显示access denied，而且我的串口并无占用。
如题。。。。。。感觉三个部分混在一起好难，开发人员能提供一个方案吗，非常感谢！