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官网SDK修改无法串口打印

我使用官网SDK,程序里没有使能串口。

我在初始化里这个函数:

void SimpleBLECentral_Init( uint8 task_id )

增加两行:

NPI_InitTransport(NULL);

。。。。。。。。。。。。。。。。。。。。。。

NPI_PrintString("Ready to Starting\r\n");

可是下进去,无法打印。请问是那里的问题?谢谢!