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内存卡格式化之后,存入main. py程序,接p4,p5和stm32通信,使用外接5V给vin供电,为什么不能实现脱机运行呢?
先用ttl转usb模块看看数据是否发出来了。
另外最近很多人串口不连GND,你也可以检查一下。