tm4c123gh6pm的Uart例程中UARTLoopbackEnable请问在哪里呢？

1.在.lib库中有的

2.C:\ti\TivaWare_C_Series-2.1.4.178\driverlib下的uart.c中也是有原型的，原型函数如下所示：

//*****************************************************************************
//
//! Enables internal loopback mode for a UART port
//!
//! \param ui32Base is the base address of the UART port.
//!
//! This function configures a UART port in internal loopback mode to help with
//! diagnostics and debug.  In this mode, the transmit and receive terminals of
//! the same UART port are internally connected.  Hence, the data transmitted
//! on the UnTx output is received on the UxRx input, without having to go
//! through I/O's.  UARTCharPut(), UARTCharGet() functions can be used along 
//! with this function.
//!
//! \return None.
//
//*****************************************************************************
void UARTLoopbackEnable(uint32_t ui32Base)
{
    //
    // Check the arguments.
    //
    ASSERT(_UARTBaseValid(ui32Base));

    //
    // Write the Loopback Enable bit to register.
    //
    HWREG(ui32Base + UART_O_CTL) |= UART_CTL_LBE;
}

3.楼主你的图片挂了，图片需要以附件方式上传，不能直接粘贴的。