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Adafruit_BBIO is a set of Python tools to allow GPIO, PWM, ADC and UART access on the BeagleBone
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It is recommended to use an official BeagleBoard.org Debian image
- Currently recommended image: Debian 9.2 "Stretch" iot (2017-10-29)
- Install Linux kernel 4.14.x to enable non-root control of GPIO and PWM (commit)
- Currently recommended image: Debian 9.2 "Stretch" iot (2017-10-29)
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Adafruit_BBIO supports Linux kernels 3.8 through 4.14
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New versions of Adafruit_BBIO may break backwards compatibility. Please read the changelog.
Easiest:
sudo ntpdate pool.ntp.org sudo apt-get update sudo apt-get install build-essential python-dev python-pip -y sudo pip install Adafruit_BBIO Manual:
sudo ntpdate pool.ntp.org sudo apt-get update sudo apt-get install build-essential python-dev python-pip -y git clone git://github.com/adafruit/adafruit-beaglebone-io-python.git cd adafruit-beaglebone-io-python sudo python setup.py install Using the library is very similar to the excellent RPi.GPIO library used on the Raspberry Pi. Below are some examples.
Import the library, and setup as GPIO.OUT or GPIO.IN::
import Adafruit_BBIO.GPIO as GPIO GPIO.setup("P8_14", GPIO.OUT) You can also refer to the pin names::
GPIO.setup("GPIO0_26", GPIO.OUT) Setup the pin for output, and write GPIO.HIGH or GPIO.LOW. Or you can use 1 or 0.::
import Adafruit_BBIO.GPIO as GPIO GPIO.setup("P8_14", GPIO.OUT) GPIO.output("P8_14", GPIO.HIGH) On-board LEDs (USR0-USR3) are handled by LED class driver rather than the GPIO pin driver.
They have a different path in the /sys/ filesystem.
Setup the pin for output and write GPIO.HIGH or GPIO.LOW::
import Adafruit_BBIO.GPIO as GPIO import time for i in range(4): GPIO.setup("USR%d" % i, GPIO.OUT) while True: for i in range(4): GPIO.output("USR%d" % i, GPIO.HIGH) time.sleep(1) for i in range(4): GPIO.output("USR%d" % i, GPIO.LOW) time.sleep(1) Inputs work similarly to outputs.:
import Adafruit_BBIO.GPIO as GPIO GPIO.setup("P8_14", GPIO.IN) Polling inputs:
if GPIO.input("P8_14"): print("HIGH") else: print("LOW") Waiting for an edge (GPIO.RISING, GPIO.FALLING, or GPIO.BOTH:
GPIO.wait_for_edge(channel, GPIO.RISING) or GPIO.wait_for_edge(channel, GPIO.RISING, timeout) Detecting events:
GPIO.add_event_detect("P9_12", GPIO.FALLING) #your amazing code here #detect wherever: if GPIO.event_detected("P9_12"): print "event detected!" The PWM Duty Cycle range was reversed in 0.0.15 from 100(off)-0(on) to 0(off)-100(on). Please update your code accordingly.
import Adafruit_BBIO.PWM as PWM #PWM.start(channel, duty, freq=2000, polarity=0) #duty values are valid 0 (off) to 100 (on) PWM.start("P9_14", 50) PWM.set_duty_cycle("P9_14", 25.5) PWM.set_frequency("P9_14", 10) PWM.stop("P9_14") PWM.cleanup() #set polarity to 1 on start: PWM.start("P9_14", 50, 2000, 1) import Adafruit_BBIO.ADC as ADC ADC.setup() #read returns values 0-1.0 value = ADC.read("P9_40") #read_raw returns non-normalized value value = ADC.read_raw("P9_40") config-pin P9.21 uart # UART2_TXD config-pin P9.22 uart # UART2_RXD config-pin P9.24 uart # UART1_TXD config-pin P9.26 uart # UART1_RXD sudo pip install pyserial import Adafruit_BBIO.UART as UART import serial UART.setup("UART1") ser = serial.Serial(port = "/dev/ttyO1", baudrate=9600) ser.close() ser.open() if ser.isOpen(): print "Serial is open!" ser.write("Hello World!") ser.close() Install py.test to run the tests. You'll also need the python compiler package for pytest:
sudo pip install pytest Execute the following in the root of the project:
sudo pytest NOTE: sudo should not be required when running Debian 9.2 "Stretch" iot (2017-10-29) with Linux kernel 4.14.x as udev configures group ownership and permission for GPIO and PWM
The BeagleBone IO Python library was originally forked from the excellent MIT Licensed RPi.GPIO library written by Ben Croston.
Written by Justin Cooper, Adafruit Industries. BeagleBone IO Python library is released under the MIT License.
