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MSP430FR6043: uart配置问题。

Part Number: MSP430FR6043

GPIO_setAsPeripheralModuleFunctionInputPin( GPIO_PORT_P1, GPIO_PIN2 | GPIO_PIN3, GPIO_PRIMARY_MODULE_FUNCTION );

此函数的第三个形参,有3个选项:主要,第二个,第三个。

请问,如何判断是选择哪个呢?

作为串口使用 Txd,Rxd应该如何设置呢?