Installing RPIO 0.8x (or 0.9x?)

So I have installed RPIO, but I am not sure if it is 0.8x or already 0.90.  The installation is very easy, just 2 commands.

To install

$ sudo apt-get install python-setuptools
$ sudo easy_install -U RPIO

Then I use the command  "sudo su" to pretend to be "root" to run Python and import RPIO.  But I forgot how to exit from "root.

To import

$ sudo su
# sudo python
import RPIO

To update 

$ rpio --update-rpio


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*** RPIO Installation ***

http://pythonhosted.org/RPIO/

The easiest way to install/update RPIO on a Raspberry Pi is with either easy_install or pip:

$ sudo apt-get install python-setuptools

$ sudo easy_install -U RPIO

After the installation you can use import RPIO as well as the command-line tool rpio.

$ sudo su
# sudo python
import RPIO

You can also get RPIO from Github repository, which is usually a step ahead of pypi:

$ git clone https://github.com/metachris/RPIO.git

$ cd RPIO

$ sudo python setup.py install

Or from Github but without Git:

$ curl -L https://github.com/metachris/RPIO/archive/master.tar.gz | tar -xz

$ cd RPIO-master

$ sudo python setup.py install


*** Welcome to RPIO’s documentation! ***

RPIO is an advanced GPIO module for the Raspberry Pi.

Hardware PWM

GPIO Input and Output (drop-in replacement for RPi.GPIO)

GPIO Interrupts (callbacks when events occur on input gpios)

TCP Socket Interrupts (callbacks when tcp socket clients send data)

Well documented, tested, fast source code

Minimal CPU and memory profile

Open source (GPLv3+)

RPIO consists of two main components:

RPIO – Python modules which you can import in Python 2 or 3 with import RPIO, import RPIO.PWM, etc.

rpio – command-line tools for inspecting and manipulating GPIOs system-wide.

Documentation
rpio, the command line tools
rpio-curses
rpio
RPIO, the Python module
GPIO & TCP Interrupts
GPIO Input & Output
Log Output
Additions to RPi.GPIO
RPIO.PWM, hardware PWM for the Raspberry Pi
Getting started
Examples
Under the hood

News

v0.9.0: Hardware PWM (via DMA)
v0.8.4: rpio-curses
v0.8.2: Socket server callbacks with RPIO.add_tcp_callback(port, callback, threaded_callback=False)
Installation

The easiest way to install/update RPIO on a Raspberry Pi is with either easy_install or pip:

$ sudo apt-get install python-setuptools
$ sudo easy_install -U RPIO
You can also get RPIO from Github repository, which is usually a step ahead of pypi:

$ git clone https://github.com/metachris/RPIO.git
$ cd RPIO
$ sudo python setup.py install
Or from Github but without Git:

$ curl -L https://github.com/metachris/RPIO/archive/master.tar.gz | tar -xz
$ cd RPIO-master
$ sudo python setup.py install
After the installation you can use import RPIO as well as the command-line tool rpio.

Feedback
Please send feedback and ideas to chris@linuxuser.at, and open an issue at Github if you’ve encountered a bug.

FAQ

How does RPIO work?

RPIO extends RPi.GPIO, a GPIO controller written in C which uses a low-level memory interface.

Interrupts are implemented with epoll via /sys/class/gpio/. For more detailled information take a look at the source, it’s well documented and easy to build.

Should I update RPIO often?

Yes, because RPIO is getting better by the day. You can use $ rpio --update-rpio or see Installation for more information about methods to update.
I’ve encountered a bug, what next?

Make sure you are using the latest version of RPIO (see Installation)
Open an issue at Github
Go to https://github.com/metachris/RPIO/issues/new
Describe the problem and steps to replicate
Add the output of $ rpio --version and $ rpio --sysinfo
pip is throwing an error during the build: source/c_gpio/py_gpio.c:9:20: fatal error: Python.h: No such file or directory

You need to install the python-dev package (eg. $ sudo apt-get install python-dev), or use easy_install (see Installation).
Links
https://github.com/metachris/RPIO
http://pypi.python.org/pypi/RPIO
http://pypi.python.org/pypi/RPi.GPIO
http://www.raspberrypi.org/wp-content/uploads/2012/02/BCM2835-ARM-Peripherals.pdf
http://www.kernel.org/doc/Documentation/gpio.txt
License
RPIO is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

RPIO is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.
Changes
v0.9.0
PWM
rpio-curses quits gracefully if terminal too small
v0.8.5
Debug-options for rpio-curses: You can now run it on any Linux/OSX machine with rpio-curses dev
v0.8.4
rpio-curses
Bugfix in RPIO: tcp callbacks (first parameter socket works now)
Renamed RPIO.rpi_sysinfo() to RPIO.sysinfo
v0.8.3: pypi release update with updated documentation and bits of refactoring
v0.8.2
Added TCP socket callbacks
RPIO does not auto-clean interfaces on exceptions anymore, but will auto-clean them as needed. This means you should now call RPIO.cleanup_interrupts() to properly close the sockets and unexport the interfaces.
Renamed RPIO.rpi_sysinfo() to RPIO.sysinfo()
v0.8.0
Improved auto-cleaning of interrupt interfaces
BOARD numbering scheme support for interrupts
Support for software pullup and -down resistor with interrupts
New method RPIO.set_pullupdn(..)
rpio now supports P5 header gpios (28, 29, 30, 31) (only in BCM mode)
Tests added in source/run_tests.py and fabfile.py
Major refactoring of C GPIO code
Various minor updates and fixes
v0.7.1
Refactoring and cleanup of c_gpio
Added new constants and methods (see documentation above)
Bugfixes
wait_for_interrupts() now auto-cleans interfaces when an exception occurs. Before you needed to call RPIO.cleanup() manually.
v0.6.4
Python 3 bugfix in rpio
Various minor updates

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