UARTwrite:Writes a string of characters to the UART output.
//! \param pcBuf points to a buffer containing the string to transmit.
//! \param ulLen is the length of the string to transmit.
UARTCharPut :Waits to send a character from the specified port.
//! \param ulBase is the base address of the UART port.
//! \param ucData is the character to be transmitted.