en:c2_hardware_uart [ODROID Wiki]

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====== UART interface using the Tinkering Kit ======
There are two UART ports on the C2. \\
They are 3.3Volt (LVTTL) interface and there is no 5Volt tolerance.

The first one is mapped to /dev/ttyS1 which is connected to 40-pin header Pin #8 & #10 & ground pin.\\

The second one is mapped to /dev/ttyS0 which is connected to Serial Console Port CON5.

=== How to test external UART pin on the 40-pin header ===

You need to prepare below items.
  * **ODROID-C2**
  * USB-UART Module Kit
  * jumper wire x4
  * serial comunication utility on your Host PC

You will connect jumper wire as below picture.\\
Connect the USB-PORT of USB-UART Module to your HOST PC\\
**The RXD and TXD must be twisted each other.**\\

{{:en:c1:odroidc1_uart.jpg?300|}}

1. HOST PC setup.\\
You will open USB Module Device on your HOST PC.\\
**Ubuntu**\\
Install serial comunication utility.
  sudo apt-get install minicom
After check your usb serial node, Open serial port.
  ls /dev/ttyUSB*
  sudo minicom -b 115200 -D /dev/ttyUSB0
  
2. Target board(**ODROID-C2**) setup.\\
Set a serial node on your **ODROID-C2**
  stty -F /dev/ttyS1 115200

3. **ODROID-C2** -> HOST PC test.\\
**ODROID-C2**
  echo 1 > /dev/ttyS1
  
4. HOST PC -> **ODROID-C2** test.\\
**ODROID-C2**
  cat /dev/ttyS1
HOST PC\\
Send characters via minicom.

=== Pin Map : UART pin on the 4-pin CON5 connector ===
<code>
_____UART____
|           |
|Pin 4 - GND|
|Pin 3 - RXD|
|Pin 2 - TXD|
|Pin 1 - VCC|
|_          |
  |_________|
</code>
3.3V LVTTL


=== Automatically configure the UART settings. ===
This is an example of default setting for a GPS module which has a 9600bpsN81 UART interface.\\
Add the following to the end of /etc/rc.local (before the exit 0)\\
<code>/bin/stty -F /dev/ttyS2 raw 9600 cs8 clocal -cstopb > /dev/null 2>&1</code>
This way the tty port is setup for use with the gps on system boot, without user interaction.\\



=== Tips for UART port ===
[[http://forum.odroid.com/viewtopic.php?f=115&t=17279|How to enable the RTS/CTS]]