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程序下载到内置flash不能脱机运行，插上SD卡并下载到SD卡后可以脱机运行，为什么？
找到问题了，是我的蓝牙坏了
图片发错了，波特率一样且端口选择正确的时候数据不正常。而且改了串口波特率后，串口助手就接收不到数据。
