KevinMidboe/python-gpiozero
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Add pins database

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Related to @lurch's comments on #148, this PR contains a database of
pins for each Pi revision, along with various other bits of miscellany
(I might've gotten a bit carried away here...).

Any corrections/extensions welcome!
This commit is contained in:
Dave Jones
2016-04-03 19:53:59 +01:00
parent 365e309af6
commit 50946b417c
9 changed files with 775 additions and 26 deletions
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11
gpiozero/pins/rpigpio.py
View File

@@ -9,6 +9,7 @@ str = type('')
from RPi import GPIO
from . import Pin
from .data import pi_info
from ..exc import (
PinInvalidFunction,
PinSetInput,
@@ -71,17 +72,21 @@ class RPiGPIOPin(Pin):
GPIO_PULL_UP_NAMES = {v: k for (k, v) in GPIO_PULL_UPS.items()}
GPIO_EDGES_NAMES = {v: k for (k, v) in GPIO_EDGES.items()}
PI_INFO = None
def __new__(cls, number):
if not cls._PINS:
GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)
if cls.PI_INFO is None:
cls.PI_INFO = pi_info()
try:
return cls._PINS[number]
except KeyError:
self = super(RPiGPIOPin, cls).__new__(cls)
cls._PINS[number] = self
self._number = number
self._pull = 'up' if number in (2, 3) else 'floating'
self._pull = 'up' if cls.PI_INFO.pulled_up('GPIO%d' % number) else 'floating'
self._pwm = None
self._frequency = None
self._duty_cycle = None
@@ -108,7 +113,7 @@ class RPiGPIOPin(Pin):
GPIO.setup(self._number, GPIO.OUT, initial=state)
def input_with_pull(self, pull):
if pull != 'up' and self._number in (2, 3):
if pull != 'up' and self.PI_INFO.pulled_up('GPIO%d' % self._number):
raise PinFixedPull('%r has a physical pull-up resistor' % self)
try:
GPIO.setup(self._number, GPIO.IN, self.GPIO_PULL_UPS[pull])
@@ -154,7 +159,7 @@ class RPiGPIOPin(Pin):
def _set_pull(self, value):
if self.function != 'input':
raise PinFixedPull('cannot set pull on non-input pin %r' % self)
if value != 'up' and self._number in (2, 3):
if value != 'up' and self.PI_INFO.pulled_up('GPIO%d' % self._number):
raise PinFixedPull('%r has a physical pull-up resistor' % self)
try:
GPIO.setup(self._number, GPIO.IN, self.GPIO_PULL_UPS[value])