View source for Serial ports usage on Linux

How to use the serial ports on Linux.

On Linux all serial ports are driven the same way with their device nodes:
* ''/dev/ttySMXn'' for i.MX own ports (''/dev/ttySMX0'' is the default console on which you can interact with the board)
* ''/dev/ttyUSBn'' for USB <-> serial converters
* ''/dev/ttySn'' for 16550 compatible FPGA's IP

==Changing port parameters==
* Get current parameters:
<pre class=apf>
# stty -F /dev/ttySMX0
speed 115200 baud;
intr = ^C; quit = ^\; erase = ^?; kill = ^U; eof = ^D; eol = ^J;
eol2 = <undef>; start = ^Q; stop = ^S; susp = ^Z; rprnt = ^R; werase = ^W;
lnext = ^V; flush = ^O; min = 1; time = 0;
-brkint ixoff -imaxbel
-iexten -echoctl
</pre>

==Sending/Receiving data==
* It is simple as opening the device as a file and writing data to it:
<pre class=apf>
# echo "HELLO" > /dev/ttySMX0
</pre>
* To receive data (ASCII in that case):
<pre class=apf>
# cat /dev/ttySMX0
</pre>

[[Category:Serial ports]]