====== Headline ======
====== GPIO Basics ======
Basis Wissen [[http://elinux.org/RPi_Low-level_peripherals#Introduction]]

Basics inkl. Beispiele in C, C++, Perl, python, c#, Scratch [[http://elinux.org/RPi_Low-level_peripherals#Introduction]]

Basics [[http://sourceforge.net/p/raspberry-gpio-python/wiki/BasicUsage/]]

===== GUI on Pi =====

webiopi [[https://code.google.com/p/webiopi/]]

webiopi integrated devices [[https://code.google.com/p/webiopi/wiki/DEVICES]]

===== Help and instructions =====
Gute Beschreibung: [[http://raspberrypiguide.de/howtos/raspberry-pi-gpio-how-to/ ]]

Beispiele und Basics [[http://sourceforge.net/p/raspberry-gpio-python/wiki/BasicUsage/ ]]

Simple Guide to the RPi GPIO Header and Pins [[http://www.raspberrypi-spy.co.uk/2012/06/simple-guide-to-the-rpi-gpio-header-and-pins/]]

GPIO basic usage [[http://sourceforge.net/p/raspberry-gpio-python/wiki/BasicUsage/]]


===== Configure pi =====
see also [[https://www.raspberrypi.org/documentation/configuration/device-tree.md]]
<code>
Manual extract

Name:   w1-gpio
Info:   Configures the w1-gpio Onewire interface module.
        Use this overlay if you *don't* need a GPIO to drive an external pullup.
Load:   dtoverlay=w1-gpio,<param>=<val>
Params: gpiopin                 GPIO for I/O (default "4")

        pullup                  Non-zero, "on", or "y" to enable the parasitic
                                power (2-wire, power-on-data) feature


Name:   w1-gpio-pullup
Info:   Configures the w1-gpio Onewire interface module.
        Use this overlay if you *do* need a GPIO to drive an external pullup.
Load:   dtoverlay=w1-gpio-pullup,<param>=<val>
Params: gpiopin                 GPIO for I/O (default "4")

        pullup                  Non-zero, "on", or "y" to enable the parasitic
                                power (2-wire, power-on-data) feature

extpullup GPIO for external pullup (default "5")
</code>

edit /boot/config.txt
<code>
dtoverlay=w1-gpio,gpiopin=4,pullup=on
</code>

===== Reading Pins =====


<code>
GPIO.setup(3, GPIO.IN)
GPIO.input(3)

</code>

===== Checking GPIO function =====
<code>
test pins
wiringPi/gpio/pintest
</code>

gpio_function(channel)

Shows the function of a GPIO channel.
For example:
<code>
import RPi.GPIO as GPIO

GPIO.setmode(GPIO.BOARD)
func = GPIO.gpio_function(pin)
</code>
will return a value from:
GPIO.INPUT, GPIO.OUTPUT, GPIO.SPI, GPIO.I2C, GPIO.HARD_PWM, GPIO.SERIAL, GPIO.UNKNOWN