Adafruit-BBIO 1.2.0

Description:

AdafruitBBIO 1.2.0

Adafruit Beaglebone I/O Python API



Adafruit BBIO is an API to enable GPIO, PWM, ADC, UART, SPI and eQEP (Quadrature Encoder) hardware access from Python applications running on the Beaglebone.


It is recommended to use an official BeagleBoard.org Debian image

Currently recommended image: Debian 10.3 "Buster" IoT (2020-04-06) (default kernel is 4.19.x-ti)



Adafruit_BBIO supports Linux kernels 3.8 through 4.19


New versions of Adafruit_BBIO may break backwards compatibility. Please read the changelog.


It is recommended to use Python 3


Installation on Debian
Note: Follow the instructions on BeagleBoard.org to get connected to the Internet
Easiest:
sudo apt-get update
sudo apt-get install build-essential python3-dev python3-pip -y
sudo pip3 install Adafruit_BBIO

Manual:
sudo apt-get update
sudo apt-get install build-essential python3-dev python3-pip -y
git clone git://github.com/adafruit/adafruit-beaglebone-io-python.git
cd adafruit-beaglebone-io-python
sudo python3 setup.py install

Upgrade Adafruit_BBIO to latest version on PyPI:
sudo pip3 install --upgrade Adafruit_BBIO

Usage
Using the library is very similar to the excellent RPi.GPIO library used on the Raspberry Pi. Below are some examples.
Pin Numbers
Please note that there is no '0' prefix for the pin numbers. For example, pin 7 on header P8 is P8_7.
Correct:
GPIO.setup("P8_7", OUT )

INCORRECT:
GPIO.setup("P8_07", OUT )

Refer to pins_t table[] in common.c all the pin labels.
config-pin
config-pin is now used on the official BeagleBoard.org Debian Jessie and Stretch images to control pin mode (e.g. pin mux).
debian@beaglebone:~$ config-pin -q P9_14
P9_14 Mode: pwm

debian@beaglebone:~$ config-pin -l P9_14
default gpio gpio_pu gpio_pd pwm

debian@beaglebone:~$ config-pin P9_14 gpio

debian@beaglebone:~$ config-pin -q P9_14
P9_14 Mode: gpio Direction: in Value: 0

debian@beaglebone:~$ config-pin P9_14 pwm

debian@beaglebone:~$ config-pin -q P9_14
P9_14 Mode: pwm

GPIO Setup
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)

GPIO Output
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
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)

GPIO Input
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!")

PWM
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)

ADC
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")

UART

Use config-pin to set pin mode for UART1 and UART2 pins

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


Install pyserial

sudo pip install pyserial


Test UART1

import Adafruit_BBIO.UART as UART
import serial

UART.setup("UART1")

with serial.Serial(port = "/dev/ttyO1", baudrate=9600) as ser:
print("Serial is open!")
ser.write(b"Hello World!")



Available UART names on BeagleBone

UART1: /dev/ttyO1, Rx: P9_26, Tx: P9_24
UART2: /dev/ttyO2, Rx: P9_22, Tx: P9_21
UART4: /dev/ttyO4, Rx: P9_11, Tx: P9_13
UART5: /dev/ttyO5, Rx: P8_38, Tx: P8_37
note: UART5 requires disable_uboot_overlay_video=1 in /boot/uEnv.txt


Available UART names on PocketBeagle

PB-UART0: /dev/ttyO0, Rx: P1_30, Tx: P1_32
PB-UART1: /dev/ttyO1, Rx: P2_11, Tx: P2_09
PB-UART2: /dev/ttyO2, Rx: P1_08, Tx: P1_10


Loopback test with UART1 and UART2

SPI

Use config-pin to set pin mode for SPI pins

SPI0

SPI0_CS0: config-pin p9.17 spi_cs
SPI0_D0: config-pin p9.21 spi
SPI0_D1: config-pin p9.18 spi
SPI0_SCLK: config-pin p9.22 spi_sclk


SPI1

SPI1_CS0: config-pin p9.20 spi_cs
SPI1_CS0: config-pin p9.28 spi_cs
SPI1_CS1: config-pin p9.19 spi_cs
SPI1_CS1: config-pin p9.42 spi_cs
SPI1_D0: config-pin p9.29 spi
SPI1_D1: config-pin p9.30 spi
SPI1_SCLK: config-pin p9.31 spi_sclk




Example:

from Adafruit_BBIO.SPI import SPI
#spi = SPI(bus, device) #/dev/spidev<bus>.<device>

# /dev/spidev0.0
spi = SPI(1,0)
print(spi.xfer2([32, 11, 110, 22, 220]))
spi.close()

# /dev/spidev0.1
spi = SPI(1,1)
print(spi.xfer2([32, 11, 110, 22, 220]))
spi.close()

# /dev/spidev1.0
spi = SPI(2,0)
print(spi.xfer2([32, 11, 110, 22, 220]))
spi.close()

# /dev/spidev1.1
spi = SPI(2,1)
print(spi.xfer2([32, 11, 110, 22, 220]))
spi.close()

eQEP
To use the enhanced Quadrature Encoder Pulse (eQEP) module, please refer to the Encoder module's documentation.
Running tests
Install py.test to run the tests. You'll also need the python compiler package for pytest:
sudo pip3 install pytest

Execute the following in the root of the project:
pytest

NOTE: sudo should not be required as udev configures group ownership and permission for GPIO and PWM
Reporting issues
When reporting issues, plesae run the following script which will print the system configuration:
sudo /opt/scripts/tools/version.sh

and paste the output in a reply.
This script should be present for any Debian or Ubunut image downloaded from:
https://beagleboard.org/ or https://rcn-ee.com/
Credits
The BeagleBone IO Python library was originally forked from the excellent MIT Licensed RPi.GPIO library written by Ben Croston.
License
Written by Justin Cooper, Adafruit Industries. BeagleBone IO Python library is released under the MIT License.
1.1.2
Daniel Nguyen (2):
Update common.c
Update common.c
Drew Fustini (28):
upload to PyPI againt to resolve #293
do not set pinmux on the beaglebone blue
remove deug output
Fix dead link to bone.js #296
force Encoder period to be an integer #299
Ignore new compiler warnings in gcc 8.2.0
Update setup.py
do not set pin mode for built-in USRn LEDs
Change name of P1_3 to match bone.js
Fix warning about casting incompatible function types #308
Fix warning print format strings being truncated #308
Fix warning about casting incompatible function types #308
Fix warnings on format truncation and sizeof in strncpy #308
Fix warning about casting incompatible function types #308
Update travis config to specify Python 3.6
Update tox.ini to Python 3.6
Merge pull request #321 from adafruit/issue308
Update ISSUE_TEMPLATE.md
Update README.md
Update README.md
Merge pull request #327 from zer0cod3r/master
Merge pull request #337 from SamPovilus/docfix
Update README.md
Update README.md
Update README.md
remove -Werror from CFLAGS
Remove suppression of gcc warnings in CFLAGS #336
Update version in setup.py to v1.2
Sam Povilus (1):
fixing document locaiton and version as current location dosn't load
1.1.1
Attempt upload to PyPI again to avoid
error reported in issue #293
1.1.0
Aaron Marburg (1):

Added usleep after successfully enabling PWM via udev.

Drew Fustini (16):

Merge pull request #233 from zsserg/fixed_segfault_in_event_detection
Merge pull request #257 from zsserg/develop
Merge pull request #251 from amarburg/master
Merge pull request #271 from fcooper/documentation-updates
Update ADC.rst
Update Encoder.rst
Update ADC.rst
Add UART entries for the PocketBeagle (issue #242)
update install and test shell scripts
update UART section in README
Merge pull request #282 from erikwelsh/master
do not load overlays for the beaglebone blue #283
Merge pull request #284 from sam-bristow/py3-docs
Merge pull request #285 from sam-bristow/bugfix/uart-error-reporting
fix pwm on pocketbeagle and beaglebone blue #286
remove debug logging

Erik Welsh (1):

Fixed GPIO export problem; Leaves GPIO in bad state on latest BeagleBone image on PocketBeagle

Franklin S Cooper Jr (3):

docs/SPI.rst: Fix bus numbering in examples
docs/GPIO.rst: Add information on blinking led
docs/GPIO.rst Make documentation a bit newbie friendly

Sam Bristow (3):

Use print() function in all code and docs
Use new python-serial API
Return error-code for failing interface

zserg (5):

Fixed SEGFAULT when calling remove_event_detect() inside python callback function.
Fixed SEGFAULT when calling remove_event_detect() inside python callback function.
Fixed SEGFAULT in event_gpio,c run_callbacks() * Added more elaborate epoll() error logging
Minor style fixes

1.0.10
features

automatically set pin modes for UART (PR #158)
Encoder: README.md: added note about eqep group change (PR #214)
deprecate out of date Adafruit_I2C.py (PR #215)
Add Encoder module info to main README.md (PR #217)
Add automatic API documentation generation (PR #219)
Separate API docs into modules (PR #221)

shortlog


David Planella (46):

Encoder: README.md: added note about eqep group change
Add Encoder module info to main README.md
Added docstrings using Google syntax and Sphinx support to generate the API documentation for the Encoder and PWM modules for now.
Made kernel version check to happen only if running on a beaglebone. The readthedocs builders that import the Encoder module have an old 3.3 kernel and the autodoc build fails
Use the default readthedocs theme
Use readthedocs theme if building docs there, remove redundand search link
Readthedocs theme tweaks
Removed redundant TOC, added global description
Added UART documentation
Added documentation badge
Added ADC API docs, fixed UART module definition
API docs: added SPI module
Added SPI module attribute docs
Added Python badges to README file
Added SPI pins table and first shot at GPIO module. Functions still need to be documented
Merge branch 'readthedocs' of https://github.com/dplanella/adafruit-beaglebone-io-python into readthedocs
Documented the API docs build process
Added docstrings using Google syntax and Sphinx support to generate the API documentation for the Encoder and PWM modules for now.
Made kernel version check to happen only if running on a beaglebone. The readthedocs builders that import the Encoder module have an old 3.3 kernel and the autodoc build fails
Use the default readthedocs theme
Use readthedocs theme if building docs there, remove redundand search link
Readthedocs theme tweaks
Removed redundant TOC, added global description
Added UART documentation
Added documentation badge
Added ADC API docs, fixed UART module definition
API docs: added SPI module
Added SPI module attribute docs
Added Python badges to README file
Added SPI pins table and first shot at GPIO module. Functions still need to be documented
Documented the API docs build process
Merge branch 'readthedocs' of https://github.com/dplanella/adafruit-beaglebone-io-python into readthedocs
Update README.md
Added some more API doc content
Sync from upstream master
Minor documentation and configuration improvements
Finished documenting GPIO
rST fixes
Update README.md
Minor API doc improvements
Merge branch 'readthedocs' of https://github.com/dplanella/adafruit-beaglebone-io-python into readthedocs
Generate the API documentation from a master index and a separate file for each module
Sync from upstream master
Improvements to the API docs output config
Update docs generation description to reflect new separate modules
Updated ADC API docs



Drew Fustini (10):

use set_pin_mode() to set uart pinmux (#158)
Add SPI instructions to README (#158)
Update README.md
Fix spidev path mismatch (#216)
Merge pull request #217 from dplanella/patch-2
Merge pull request #214 from dplanella/patch-1
Deprecate Adafruit_BBIO.I2C in favor of Adafruit_GPIO.I2C (#215)
Merge pull request #219 from dplanella/readthedocs
relocate doc dir to avoid confusion (#218)
Merge pull request #221 from dplanella/readthedocs



1.0.9
Features:

Issue #194: Encoder position cannot be set
PR #205: Encoder: add support for reading/writing sysfs attributes

Fixes:

Issue #198: use https for DEFAULT_URL in distribute_setup.py
Issue #197: Fix leak of pwm enable file descriptor
Issue #189: Fix seg fault of PWM in Python 3.6
Issue #180: Clarify there is no 0 prefix for pin lables
PR #201: Encoder: do kernel check, PEP8 cleanup
PR #202: Encoder: corrected kernel check logic
PR #207: Encoder: improved usage documentation
PR #210: Encoder: fix sysfs import, make code Python 3 compatible
PR #212: Encoder: fix Python 3 compatibility
PR #213: Encoder: fix frequency calculation from period

shortlog:


David Planella (18):

Encoder: initialize only the given channel
Sync from master
Encoder: do kernel check, PEP8 cleanup
Encoder: added sysfs module
Encoder: use sysfs to write QEP attributes
Encoder: corrected kernel check logic
Merge pull request #2 from adafruit/master
Encoder: convert get/set methods to properties, update apidoc strings
Encoder: updated README
Encoder: add README apt install clarification
Encoder: copyright assignment note, updated comments
Encoder: added usage notes
Encoder: improved usage documentation
Encoder: minor fix to usage example
Encoder: added a note about permissions
Encoder: switched sysfs to be a relative import compatible with Python 2 and 3
Encoder: use items() instead of iteritems() to be Python 3 compatible
Encoder: fix frequency getter



Drew Fustini (18):

use https for DEFAULT_URL in distribute_setup.py (#198)
fix except syntax for Python 3
use dict.items() instead of dict.iteritems() for Python 3
fix error in set_brightness()
close enable_fd when stopping PWM output (#197)
Merge pull request #199 from dplanella/patch-1
Fix leak of pwm enable file descriptor (#197)
Merge pull request #201 from dplanella/encoder-cleanup
remove test_rotary.py as not valid for pytest
Fix seg fault of PWM in Python 3.6 (#189)
Merge pull request #202 from dplanella/patch-2
Clarify there is no 0 prefix for pin lables (#180)
Merge pull request #205 from dplanella/encoder-sysfs
assign copyright for new file to Adafruit Industries
Add bash scripts to help install and test
Merge pull request #212 from dplanella/patch-4
Merge pull request #207 from dplanella/patch-3
Merge pull request #213 from dplanella/fix-encoder-frequency



1.0.8
Fixes:

Issue #196: cache board type to avoid poor performance
Issue #192: fix PocketBeagle PWM pin typo
Issue #191: turn off RotaryEncoder's debug output by default
Issue #188: GPIO is extremely slow (20ms to toggle)
Issue #186: problems with UART

shortlog:


David Planella (12):

Copy Encoder module comments to README.md
Formatted Encoder README in markdown
Fixed Encoder README formatting
Removed QEP instructions from Encoder module
Fixes to Encoder README
Updated Encoder README
Encoder README: added info on dedicated overlays
Encoder README: updated info on pre-requisites
Encoder README update
Encoder README update
Add logging support, turn off unconditional debug output
Encoder: remove unused logging code



Drew Fustini (3):

Merge pull request #195 from dplanella/master
Fix PocketBeagle PWM pin typo (#192)
cache board type to avoid poor performance (#196)



1.0.7
Fixes:

Issue #188: GPIO is extremely slow (20ms to toggle)

shortlog:

Drew Fustini (4):

Update README.md
add config-pin example to README
Filter DEBUG syslog to avoid poor performance #188
Change log level from INFO to DEBUG #188



1.0.6

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)



Features:

Add support for Linux 4.14 kernel including new "udev" style for PWM entries in /sys
Fix GPIO regression due to BeagleBone Blue LED support (issue #178)
Add support for the PocketBeagle (issue #172)

shortlog:


Drew Fustini (39):

Add -Wno-unit_address_vs_reg to avoid dtc warning
check if board is BeagleBone Blue or PocketBeagle
check if BeagleBone Blue before accessing non-standard LEDs
Add test for GPIO regression #178
change syslog mask level to DEBUG
add "Adafruit_BBIO" to syslog()
update test for issue #178
remove polarity "hack" for PWM #170
move pwm_set_polarity() after period is set
add test for issue #170
only check kernel overlays if u-boot overlays are not being used
Attempt to use udev ecap path for pwm path
add test script for all BeagleBone PWM outputs
update PWM test for 4.14 kernel udev paths
minor change to pwm debug logging
sleep to avoid udev race condition #185



Mark A. Yoder (1):

Added BAT25, BAT50, BAT75, BAT100 and WIFI LEDs



Peter Lawler (1):

Missing CR/LF



Robert Nelson (10):

source/common.c: add initial PocketBeagle values
source/common.c: PocketBeagle, no slots file, everything built-in
source/common.c: PocketBeagle, no slots file disable here too
source/c_pwm.c: HACK: U-Boot pre-setup everything, dont search for specific overlay
source/c_pwm.c: HACK: PocketBeagle: v4.14.x
source/c_pwm.c: debug pwm_path/pwm_path_udev
source/c_pwm.c: pwm: add support for pwmchipX/pwm-X:Y syntax
source/c_pwm.c: disable pwm_set_polarity (broken in v4.9.x/v4.14.x)
source/common.c: Blue Fix GP0_3 id
source/common.c: PocketBeagle Fix P2.24



1.0.5


@pdp7 (5):

Merge pull request #153 from MarkAYoder/master
Fix print syntax to avoid python3 errors
Merge pull request #160 from MarkAYoder/master
document how to read QEP1
Update rotary-encoder-eqep-test.md



@MarkAYoder (20):

Have GP0_1 working
Removed --force to speed things up
Added GP0 1, 2 and 3
Flashes 4 LEDs
Works with button
Blinks red and gree LEDs
Blinks all 6 GPIOs
Added red and green LEDs
i2c works
PWD isn't working, yet
Added port setup
Switched to apt install
Added tmp101 to name
Added LED matrix example
Removed newline from print
Added fade
Adding GPIO defs for uart1
Testing UT1_0, not working yet
Switched GP0_0 to GP0_3, etc.
Added PAUSE and MODE buttons.



1.0.4


@djsutton (1):

fix TypeError: function takes exactly 3 arguments (2 given) from wait_for_edge



@pdp7 (29):

Instruct users to open GitHub issue instead email
add udev rules and script for non-root access to gpio
fix file descriptor leak in gpio_set_value()
document how to test read and write to all GPIO pins
reduce ADC reads in pytest from 10,000 to 1,000
close file descriptor to avoid leak
remove conditional logic for ctrl_dir and ocp_dir size
increase size of ctrl_dir and ocp_dir for future use
Document how to run config-pin at boot
Document how to test eQEP with Rotary Encoder
Add skeleton for Encoder module to read eQEP
Add code to Encoder.QEP from PyBBIO.RotaryEncoder
Adapt code from PyBBIO.RotaryEncoder
add test for rotary encoder
read from eqep position file
return position from getPosition()
document howo to enable all the eqep pins
Document how to test eqep pins with rotary encoder
run config-pin to set pin mux for qep
update QEP test
update QEP test for issue #122
Test if kernel booted wit u-boot overlays
check if kernel cmdline for uboot overlay
Add documentation about u-boot overlays
Return BBIO_OK when u-boot overlays ared enabled
remove debug printing
Skip check for device tree loaded if u-boot overlays enabled
Sleep after loading ADC overlay to allow driver load
Workaround test failure until TIMERn bug is fixed



@ltjax (3):

Use lookup table to prevent duplicate pin export
Handle already exported pins
Fix build_path memory leak



@Vadim-Stupakov (1):

Fixed issue #145 GPIO library doesn't free GPIO file descriptor. File descriptor leak. Made a little bit refactoring



@cocasema (8):

Declare PHONY targets in root Makefile
Extract BBIO_err into a separate header
Add syslog and debugging messages
Add libadafruit-bbio with C++ wrappers for PWM/GPIO
Add 2 versions of library with c++98 and c++11 abi
Install header files properly
Add default values to pwm::start() method.
Add PWM c++ tests



@zsserg (2):

Added error checking for setting pin direction in gpio.setup() (Python)
Added debug output to set_pin_mode()



1.0.3

Add -Wno-strict-aliasing to CFLAGS to ignore gcc warning

Resolves GitHub issue #133 by @archey



1.0.2

Merge pull request #130 from adafruit/issue129-usr-leds [1439133]

Add support for alternate USR LED labels


Merge pull request #131 from adafruit/fix-gcc-warnings [f0ee018]

Fix gcc warnings


Merge pull request #132 from buckket/setup_unicode_fix [4c67dfc]

Make use of io.open() with explicit file encoding in setup.py



1.0.1

Merge pull request #124 from jpbarraca/master [cf9771a]

Timeout support for wait_for_edge (replaces PR #62)


Merge pull request #123 from bubbapizza/master [8b4f7f2]

Added a delay parameter for GPIO.setup() for udev permissions


Merge pull request #121 from dengber/master [50e8883]

ADC.read() returns wrong value


Merge pull request #64 from olegantonyan/master [d1e8dc1]

Wait until GPIO file appears on the /sys filesystem (issue #36)


Merge pull request #106 from cocasema/master [12b79d7]

Treat warnings as errors


Merge pull request #119 from JesseMcL/pr [e7e987a]

Add GPIO pullup configurations and fix PWM Segfault on kernel 4.1+


Merge pull request #116 from kozga/master [1b04cdf]

Fix SPI: IOError: [Errno 22] Invalid argument in xfer and xfer2 funct…



1.0.0

Merge pull request #108 from MatthewWest for PWM support in Linux kernel 4.1+
Merge pull request #96 from PeteLawler for ADC support in Linux kernel 4.1+
Finally publish new version to PyPi
Bump major version number to signify long duration since last release

0.0.30

Merge Python 3 compatibility fixes from Github user westphahl.
Moved old Angstrom build fix for missing py_compile from setup.py to separate file.

0.0.20

Fix for SPI not loading spidevX.X correctly based on load order
Initialize ctrl_dir in unload_device_tree #63
Clean up unused/dead code

0.0.19

Fix for SPI.xfer crashes python after 3 calls
Added a retry to reading for the analog inputs to avoid a bug where reading back and forth between two analog inputs would cause the resource to be unavailable every 16 scans (zthorson)
Updated the build_path to be more selective over what paths it chooses (zthorson)
Update Debian installation instructions in README (justinledwards)
Increase the size of the buffer used for storing device tree names (SaintGimp)

0.0.18

UART - Include UART overlays, and compile upon installation
UART - Rename UART overlays
Adafruit_I2C - Remove readU16Rev and readS16Rev
Adafruit_I2C - Updated readU16/readS16 for correct 16-bit reads

0.0.17

Fix SPI memory leaks
Clean up of PWM code (bit-hacker, jwcooper)
Remove UART debug statements

0.0.16

Add polarity as optional fourth parameter to PWM.start(). Valid values are 0 and 1. Default is still 0.
Fix for actually setting the polarity in start.
Add new unit tests to check that the polarity is being set properly, and valid values passed in.

0.0.15

Fix PWM duty cycle so 0 is off and 100 is on. Set polarity to 0 by default.
Give extra buffer space in export, and unexport functions for gpio that are more than 2 digits (Chris Desjardins)
Add new test case for 3 digit gpio (Chris Desjardins)
Fix for test_direction_readback. gpio_get_direction wasn't properly null terminating the direction string (Chris Desjardins)

0.0.14

Fix GPIO.gpio_function to work with the IO name (zthorson)
Fix IOErrors not getting raised when fopen fails while loading overlays into device tree (bradfordboyle, jwcooper)
Add new UART tests

0.0.13

Remove the gpio parameter from callbacks (cdesjardins)

0.0.12

Bump version due to pypi issues

0.0.11

New UART module to export UART overlays
Alpha support for SPI
Add small delay after loading any device tree overlays

0.0.10


Fix direction for event detection code
Fix for segmentation faults on add_event_detect

0.0.9


Fix for ADC Segmentation Faults

0.0.8


Temp remove overlay compilation. Ubuntu failures.

0.0.7


Refactor and clean up adc and pwm
Fix tests for Adafruit_BBIO rename

0.0.6


Include Adafruit_I2C.py as top-level module

0.0.5

Rename from BBIO to Adafruit_BBIO to reduce library conflicts and confusion.

0.0.4

Support for pip and easy_install

0.0.3


ADC enabled

0.0.2


PWM enabled

0.0.1


Initial Commit
GPIO mostly working
Initial GPIO unit tests
PWM in progress