mirror of
https://github.com/xtacocorex/CHIP_IO
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132 lines
3.2 KiB
ReStructuredText
132 lines
3.2 KiB
ReStructuredText
CHIP_IO
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============================
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A CHIP GPIO library
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Manual::
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sudo ntpdate pool.ntp.org
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sudo apt-get update
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sudo apt-get install git build-essential python-dev python-pip -y
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git clone git://github.com/xtacocorex/CHIP_IO.git
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cd CHIP_IO
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sudo python setup.py install
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cd ..
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sudo rm -rf CHIP_IO
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**Usage**
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Using the library is very similar to the excellent RPi.GPIO library used on the Raspberry Pi. Below are some examples.
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All scripts that require GPIO access need to be run with super user permissions!
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**GPIO Setup**
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Import the library, and setup as GPIO.OUT or GPIO.IN::
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import CHIP_IO.GPIO as GPIO
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GPIO.setup("CSID0", GPIO.OUT)
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You can also refer to the pin number::
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GPIO.setup("U14_31", GPIO.OUT)
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**GPIO Output**
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Setup the pin for output, and write GPIO.HIGH or GPIO.LOW. Or you can use 1 or 0.::
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import CHIP_IO.GPIO as GPIO
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GPIO.setup("CSID0", GPIO.OUT)
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GPIO.output("CSID0", GPIO.HIGH)
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**GPIO Input**
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Inputs work similarly to outputs.::
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import CHIP_IO.GPIO as GPIO
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GPIO.setup("CSID0", GPIO.IN)
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Polling inputs::
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if GPIO.input("CSID0"):
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print("HIGH")
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else:
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print("LOW")
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Waiting for an edge (GPIO.RISING, GPIO.FALLING, or GPIO.BOTH::
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This only works for the AP-EINT1, AP-EINT3, and XPO Pins on the CHIP
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GPIO.wait_for_edge(channel, GPIO.RISING)
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Detecting events::
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GPIO.setup("XIO-P0", GPIO.IN)
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GPIO.add_event_detect("XIO-P0", GPIO.FALLING)
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#your amazing code here
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#detect wherever:
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if GPIO.event_detected("XIO-P0"):
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print "event detected!"
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**GPIO Cleanup**
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To clean up the GPIO when done, do the following::
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GPIO.cleanup()
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**PWM**::
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import CHIP_IO.PWM as PWM
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#PWM.start(channel, duty, freq=2000, polarity=0)
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#duty values are valid 0 (off) to 100 (on)
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PWM.start("PWM0", 50)
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PWM.set_duty_cycle("PWM0", 25.5)
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PWM.set_frequency("PWM0", 10)
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PWM.stop("PWM0")
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PWM.cleanup()
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#set polarity to 1 on start:
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PWM.start("PWM0", 50, 2000, 1)
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**SOFTPWM**::
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import CHIP_IO.SOFTPWM as PWM
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#PWM.start(channel, duty, freq=2000, polarity=0)
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#duty values are valid 0 (off) to 100 (on)
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#you can choose any pin
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PWM.start("XIO-P7", 50)
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PWM.set_duty_cycle("XIO-P7", 25.5)
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PWM.set_frequency("XIO-P7", 10)
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PWM.stop("XIO-P7")
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PWM.cleanup()
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#set polarity to 1 on start:
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PWM.start("XIO-P7", 50, 2000, 1)
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Use SOFTPWM at low speeds (hundreds of Hz) for the best results. Do not use for anything that needs high precision or reliability.
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**ADC**::
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Not Implemented yet
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**Running tests**
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Install py.test to run the tests. You'll also need the python compiler package for py.test.::
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sudo apt-get install python-pytest
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Execute the following in the root of the project::
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sudo py.test
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**Credits**
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The CHIP IO Python library was originally forked from the Adafruit Beaglebone IO Python Library.
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The BeagleBone IO Python library was originally forked from the excellent MIT Licensed [RPi.GPIO](https://code.google.com/p/raspberry-gpio-python) library written by Ben Croston.
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**License**
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CHIP IO port by Robert Wolterman, released under the MIT License.
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Beaglebone IO Library Written by Justin Cooper, Adafruit Industries. BeagleBone IO Python library is released under the MIT License.
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