A module to control Raspberry Pi GPIO channels
This package provides a class to control the GPIO on a Raspberry Pi.
Note that this module is unsuitable for real-time or timing critical applications. This is because you can not predict when Python will be busy garbage collecting. It also runs under the Linux kernel which is not suitable for real time applications - it is multitasking O/S and another process may be given priority over the CPU, causing jitter in your program. If you are after true real-time performance and predictability, buy yourself an Arduino http://www.arduino.cc !
Note that the current release does not support SPI, I2C, PWM or serial functionality on the RPi yet. This is planned for the near future - watch this space! One-wire functionality is also planned.
Example Usage :
import RPi.GPIO as GPIO # to use Raspberry Pi board pin numbers GPIO.setmode(GPIO.BOARD) # set up GPIO output channel GPIO.setup(12, GPIO.OUT) # set RPi board pin 12 high GPIO.output(12, GPIO.HIGH) # set up GPIO output channel with an initial state GPIO.setup(26, GPIO.OUT, initial=GPIO.LOW) # set up GPIO input with pull-up control # (pull_up_down be PUD_OFF, PUD_UP or PUD_DOWN, default PUD_OFF) GPIO.setup(11, GPIO.IN, pull_up_down=GPIO.PUD_UP) # input from RPi board pin 11. Will return GPIO.HIGH==1 or GPIO.LOW==0 input_value = GPIO.input(11) # Enable edge detection events # can be RISING, FALLING or BOTH GPIO.add_event_detect(11, GPIO.RISING) # Check to see if an event has occurred since the last time we checked (poll) if GPIO.event_detected(11): print('Rising edge has occurred!') # Add a threaded callback for an edge detection event. Note that event detection must be enabled first using add_event_detect() def my_event_callback_function(): print('Callback function called!') GPIO.add_event_callback(11, my_event_callback_function) # Remove edge detection events for a channel GPIO.remove_event_detect(11) # Another way of adding edge detection events with a threaded callback def my_event_callback_function(): print('Callback function called!') GPIO.add_event_detect(11, GPIO.RISING, callback=my_event_callback_function) # wait for a button press without polling (uses negligable CPU) GPIO.wait_for_edge(11, GPIO.RISING) # to change to BCM GPIO numbering GPIO.setmode(GPIO.BCM) # to reset every channel that has been set up by this program to INPUT with no pullup/pulldown and no event detection. GPIO.cleanup()
Added new edge detection events (interrupt handling) - Added add_event_detect() - Added remove_event_detect() - Added add_event_callback() - Added wait_for_edge()
Removed old experimental event functions - Removed set_rising_event() - Removed set_falling_event() - Removed set_high_event() - Removed set_low_event()
Changed event_detected() for new edge detection functionality
input() now returns 0/LOW == False or 1/HIGH == True (integers) instead of False or True (booleans).
Fix error on repeated import (issue 3)
Change SetupException to a RuntimeError so it can be caught on import (issue 25, Chris Hager <firstname.lastname@example.org>)
Improved docstrings of functions
Fix for installing on Arch Linux (Python 3.3) (issue 20)
Initial value when setting a channel as an output (issue 19)
Permit input() of channels set as outputs (Eric Ptak <email@example.com>)
Added support for Revision 2 boards
Added cleanup() function and removed automatic reset functionality on program exit
Added get_function() to read existing GPIO channel functionality (suggestion from Eric Ptak <firstname.lastname@example.org>)
Converted debian to armhf
Fixed C function short_wait() (thanks to Thibault Porteboeuf <email@example.com>)
Fixed critical bug with swapped high/low state on outputs
Added pull-up / pull-down setup functionality for inputs
Rewritten as a C extension
Now uses /dev/mem and SoC registers instead of /sys/class/gpio
Make call to GPIO.setmode() mandatory
Added GPIO.HIGH and GPIO.LOW constants
Changed status from alpha to beta
Added setmode() to be able to use BCM GPIO 00.nn channel numbers
Renamed InvalidPinException to InvalidChannelException
Fixed direction bug
Added MANIFEST.in (to include missing file)
Changed GPIO channel number to pin number
Tested and working!
Added GPIO table
Fixed a few critical bugs
Still completely untested!
Internal refactoring. Still completely untested!
First version. Completely untested until I can get hold of a Raspberry Pi!
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