diff options
Diffstat (limited to 'Adafruit_Python_GPIO/Adafruit_GPIO/Platform.py')
-rw-r--r-- | Adafruit_Python_GPIO/Adafruit_GPIO/Platform.py | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/Adafruit_Python_GPIO/Adafruit_GPIO/Platform.py b/Adafruit_Python_GPIO/Adafruit_GPIO/Platform.py new file mode 100644 index 0000000..2c041a8 --- /dev/null +++ b/Adafruit_Python_GPIO/Adafruit_GPIO/Platform.py @@ -0,0 +1,110 @@ +# Copyright (c) 2014 Adafruit Industries +# Author: Tony DiCola + +# Permission is hereby granted, free of charge, to any person obtaining a copy +# of this software and associated documentation files (the "Software"), to deal +# in the Software without restriction, including without limitation the rights +# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +# copies of the Software, and to permit persons to whom the Software is +# furnished to do so, subject to the following conditions: + +# The above copyright notice and this permission notice shall be included in all +# copies or substantial portions of the Software. + +# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE +# SOFTWARE. +import platform +import re + +# Platform identification constants. +UNKNOWN = 0 +RASPBERRY_PI = 1 +BEAGLEBONE_BLACK = 2 +MINNOWBOARD = 3 + +def platform_detect(): + """Detect if running on the Raspberry Pi or Beaglebone Black and return the + platform type. Will return RASPBERRY_PI, BEAGLEBONE_BLACK, or UNKNOWN.""" + # Handle Raspberry Pi + pi = pi_version() + if pi is not None: + return RASPBERRY_PI + + # Handle Beaglebone Black + # TODO: Check the Beaglebone Black /proc/cpuinfo value instead of reading + # the platform. + plat = platform.platform() + if plat.lower().find('armv7l-with-debian') > -1: + return BEAGLEBONE_BLACK + elif plat.lower().find('armv7l-with-ubuntu') > -1: + return BEAGLEBONE_BLACK + elif plat.lower().find('armv7l-with-glibc2.4') > -1: + return BEAGLEBONE_BLACK + + # Handle Minnowboard + # Assumption is that mraa is installed + try: + import mraa + if mraa.getPlatformName()=='MinnowBoard MAX': + return MINNOWBOARD + except ImportError: + pass + + # Couldn't figure out the platform, just return unknown. + return UNKNOWN + + +def pi_revision(): + """Detect the revision number of a Raspberry Pi, useful for changing + functionality like default I2C bus based on revision.""" + # Revision list available at: http://elinux.org/RPi_HardwareHistory#Board_Revision_History + with open('/proc/cpuinfo', 'r') as infile: + for line in infile: + # Match a line of the form "Revision : 0002" while ignoring extra + # info in front of the revsion (like 1000 when the Pi was over-volted). + match = re.match('Revision\s+:\s+.*(\w{4})$', line, flags=re.IGNORECASE) + if match and match.group(1) in ['0000', '0002', '0003']: + # Return revision 1 if revision ends with 0000, 0002 or 0003. + return 1 + elif match: + # Assume revision 2 if revision ends with any other 4 chars. + return 2 + # Couldn't find the revision, throw an exception. + raise RuntimeError('Could not determine Raspberry Pi revision.') + + +def pi_version(): + """Detect the version of the Raspberry Pi. Returns either 1, 2 or + None depending on if it's a Raspberry Pi 1 (model A, B, A+, B+), + Raspberry Pi 2 (model B+), or not a Raspberry Pi. + """ + # Check /proc/cpuinfo for the Hardware field value. + # 2708 is pi 1 + # 2709 is pi 2 + # 2835 is pi 3 on 4.9.x kernel + # Anything else is not a pi. + with open('/proc/cpuinfo', 'r') as infile: + cpuinfo = infile.read() + # Match a line like 'Hardware : BCM2709' + match = re.search('^Hardware\s+:\s+(\w+)$', cpuinfo, + flags=re.MULTILINE | re.IGNORECASE) + if not match: + # Couldn't find the hardware, assume it isn't a pi. + return None + if match.group(1) == 'BCM2708': + # Pi 1 + return 1 + elif match.group(1) == 'BCM2709': + # Pi 2 + return 2 + elif match.group(1) == 'BCM2835': + # Pi 3 / Pi on 4.9.x kernel + return 3 + else: + # Something else, not a pi. + return None |