Overview
========
The uart_dma example shows how to use uart driver with DMA:

In this example, one uart instance connect to PC through uart, the board will
send back all characters that PC send to the board.

Note: The example echo every 8 characters, so input 8 characters every time.

Toolchain supported
===================
- IAR embedded Workbench 7.50.1
- Keil MDK 5.17
- GCC ARM Embedded 2015-4.9-q3
- Kinetis Development Studio IDE 3.0.0
- Atollic TrueSTUDIO 5.4.0

Hardware requirements
=====================
- Mini USB cable
- USB to TTL converter
- FRDM-KL27Z board
- Personal Computer

Board settings
==============
Connect the USB to TTL converter to FRDM-KL27Z board.
FRDM-KL27Z UART pins:
- TX of USB2COM to J1-7
- RX of USB2COM to J1-5
- GND of USB2COM to J2-14

Prepare the Demo
================
1.  Connect a mini USB cable between the PC host and the OpenSDA USB port on the board.
2.  Connect the USB to TTL converter to PC host.
3.  Open a serial terminal on PC for the USB to TTL converter with these settings:
    - 115200 baud rate
    - 8 data bits
    - No parity
    - One stop bit
    - No flow control
4.  Download the program to the target board.
5.  Reset the SoC and run the project.

Running the demo
================
When the demo runs successfully, the log would be seen on the OpenSDA terminal like:
~~~~~~~~~~~~~~~~~~~~~~~~~~~
UART DMA example
Send back received data
Echo every 8 characters
~~~~~~~~~~~~~~~~~~~~~~~~~~~

Customization options
=====================


