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openmv中对串口的初始化代码是 uart = UART(3,115200)#初始化串口 波特率 115200 但是对openmv和其他开发板连线时，一共有四个接口，VIN、GND、RXD、TXD 其中VIN、GND可以在openmv上找到对应接口，RXD和TXD对应接口是哪个？ 串口初始化的应该是串口3，接线是不是应该接到p3上？
https://book.openmv.cc/MCU/serial2.html#arduino解析程序