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初学者,想弄个openmv与stm32的串口通信,但是不知道为什么用电脑usb接在拓展版上可以接收到openmv发送的“1”,用usbttl就接收不到数据量(先应该是没有接错的)如图所示。麻烦大佬们可以指点一下QAQ