Raspberry Pi GPIO tools: an extension of RPi.GPIO to easily handle interrupts, and a command line multitool.
Visit http://pythonhosted.org/RPIO for a pretty version of this documentation.
RPIO is a Raspberry Pi GPIO toolbox, consisting of two main parts:
- rpio, a command-line multitool for inspecting and manipulating GPIOs
- RPIO.py, a module which extends RPi.GPIO with interrupt handling and other good stuff
The easiest way to install/update RPIO on a Raspberry Pi is with either easy_install or pip:
$ sudo easy_install -U RPIO $ sudo pip install -U RPIO
Another way to get RPIO is directly from the Github repository:
$ git clone https://github.com/metachris/RPIO.git $ cd RPIO $ sudo python setup.py install
After the installation you can use import RPIO as well as the command-line tool rpio.
rpio, the command line tool
rpio allows you to inspect and manipulate GPIO’s system wide, including those used by other processes. rpio needs to run with superuser privileges (root), else it will restart using sudo. The BCM GPIO numbering scheme is used by default. Here are a few examples of using rpio:
Show the help page: $ rpio -h Inspect the function and state of gpios (with -i/--inspect): $ rpio -i 7 $ rpio -i 7,8,9 $ rpio -i 1-9 # Example output for `rpio -i 1-9` (non-existing are ommitted) GPIO 2: ALT0 (1) GPIO 3: ALT0 (1) GPIO 4: INPUT (0) GPIO 7: OUTPUT (0) GPIO 8: INPUT (1) GPIO 9: INPUT (0) Inspect all GPIO's on this board (with -I/--inspect-all): $ rpio -I Set GPIO 7 to `1` (or `0`) (with -s/--set): $ rpio -s 7:1 You can only write to pins that have been set up as OUTPUT. You can set this yourself with `--setoutput <gpio-id>`. Show interrupt events on GPIOs (with -w/--wait_for_interrupts; default edge='both'): $ rpio -w 7 $ rpio -w 7:rising,8:falling,9 $ rpio -w 1-9 Setup a pin as INPUT (optionally with pullup or -down resistor): $ rpio --setinput 7 $ rpio --setinput 7:pullup $ rpio --setinput 7:pulldown Setup a pin as OUTPUT: $ rpio --setoutput 8 Show Raspberry Pi system info: $ rpio --sysinfo # Example output: Model B, Revision 2.0, RAM: 256 MB, Maker: Sony
You can update RPIO to the latest version with –update-rpio:
$ rpio --update-rpio
rpio can install (and update) its manpage:
$ rpio --update-man $ man rpio
rpio was introduced in version 0.5.1.
RPIO.py, the Python module
RPIO extends RPi.GPIO with interrupt handling and a few other goodies.
Interrupts are used to receive notifications from the kernel when GPIO state changes occur. Advantages include minimized cpu consumption, very fast notification times, and the ability to trigger on specific edge transitions (‘rising|falling|both’). RPIO uses the BCM GPIO numbering scheme by default. This is an example of how to use RPIO to react on events on 3 pins by using interrupts, each with different edge detections:
# Setup logging import logging log_format = '%(levelname)s | %(asctime)-15s | %(message)s' logging.basicConfig(format=log_format, level=logging.DEBUG) # Get started import RPIO def do_something(gpio_id, value): logging.info("New value for GPIO %s: %s" % (gpio_id, value)) RPIO.add_interrupt_callback(7, do_something, edge='rising') RPIO.add_interrupt_callback(8, do_something, edge='falling') RPIO.add_interrupt_callback(9, do_something, edge='both') RPIO.wait_for_interrupts()
If you want to receive a callback inside a Thread (which won’t block anything else on the system), set threaded_callback to True when adding an interrupt- callback. Here is an example:
RPIO.add_interrupt_callback(7, do_something, edge='rising', threaded_callback=True)
Make sure to double-check the value returned from the interrupt, since it is not necessarily corresponding to the edge (eg. 0 may come in as value, even if edge=”rising”). To remove all callbacks from a certain gpio pin, use RPIO.del_interrupt_callback(gpio_id). To stop the wait_for_interrupts() loop you can call RPIO.stop_waiting_for_interrupts().
Besides the interrupt handling, you can use RPIO just as RPi.GPIO:
import RPIO # set up input channel without pull-up RPIO.setup(7, RPIO.IN) # set up input channel with pull-up control # (pull_up_down be PUD_OFF, PUD_UP or PUD_DOWN, default PUD_OFF) RPIO.setup(7, RPIO.IN, pull_up_down=RPIO.PUD_UP) # read input from gpio 7 input_value = RPIO.input(7) # set up GPIO output channel RPIO.setup(8, RPIO.OUT) # set gpio 8 to high RPIO.output(8, True) # set up output channel with an initial state RPIO.setup(18, RPIO.OUT, initial=RPIO.LOW) # change to BOARD numbering schema (interrupts will still use BCM though) RPIO.setmode(RPIO.BOARD) # reset every channel that has been set up by this program. and unexport gpio interfaces RPIO.cleanup()
You can use RPIO as a drop-in replacement for RPi.GPIO in your existing code like this (if you’ve used the BCM gpio numbering scheme):
import RPIO as GPIO # (if you've previously used `import RPi.GPIO as GPIO`)
Chris Hager (firstname.lastname@example.org)
If you’ve encountered a bug, please let me know via Github: https://github.com/metachris/RPIO/issues.
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.
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