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-rw-r--r--Adafruit_Python_GPIO/Adafruit_GPIO/PCF8574.py94
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diff --git a/Adafruit_Python_GPIO/Adafruit_GPIO/PCF8574.py b/Adafruit_Python_GPIO/Adafruit_GPIO/PCF8574.py
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--- a/Adafruit_Python_GPIO/Adafruit_GPIO/PCF8574.py
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@@ -1,94 +0,0 @@
-'''
-Adafruit compatible using BaseGPIO class to represent a PCF8574/A IO expander
-Copyright (C) 2015 Sylvan Butler
-
-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 Adafruit_GPIO as GPIO
-import Adafruit_GPIO.I2C as I2C
-
-
-
-IN = GPIO.IN
-OUT = GPIO.OUT
-HIGH = GPIO.HIGH
-LOW = GPIO.LOW
-
-
-class PCF8574(GPIO.BaseGPIO):
- """Class to represent a PCF8574 or PCF8574A GPIO extender. Compatible
- with the Adafruit_GPIO BaseGPIO class so it can be used as a custom GPIO
- class for interacting with device.
- """
-
- NUM_GPIO = 8
-
- def __init__(self, address=0x27, busnum=None, i2c=None, **kwargs):
- address = int(address)
- self.__name__ = \
- "PCF8574" if address in range(0x20, 0x28) else \
- "PCF8574A" if address in range(0x38, 0x40) else \
- "Bad address for PCF8574(A): 0x%02X not in range [0x20..0x27, 0x38..0x3F]" % address
- if self.__name__[0] != 'P':
- raise ValueError(self.__name__)
- # Create I2C device.
- i2c = i2c or I2C
- busnum = busnum or i2c.get_default_bus()
- self._device = i2c.get_i2c_device(address, busnum, **kwargs)
- # Buffer register values so they can be changed without reading.
- self.iodir = 0xFF # Default direction to all inputs is in
- self.gpio = 0x00
- self._write_pins()
-
-
- def _write_pins(self):
- self._device.writeRaw8(self.gpio | self.iodir)
-
- def _read_pins(self):
- return self._device.readRaw8() & self.iodir
-
-
- def setup(self, pin, mode):
- self.setup_pins({pin: mode})
-
- def setup_pins(self, pins):
- if False in [y for x,y in [(self._validate_pin(pin),mode in (IN,OUT)) for pin,mode in pins.items()]]:
- raise ValueError('Invalid MODE, IN or OUT')
- for pin,mode in pins.items():
- self.iodir = self._bit2(self.iodir, pin, mode)
- self._write_pins()
-
-
- def output(self, pin, value):
- self.output_pins({pin: value})
-
- def output_pins(self, pins):
- [self._validate_pin(pin) for pin in pins.keys()]
- for pin,value in pins.items():
- self.gpio = self._bit2(self.gpio, pin, bool(value))
- self._write_pins()
-
-
- def input(self, pin):
- return self.input_pins([pin])[0]
-
- def input_pins(self, pins):
- [self._validate_pin(pin) for pin in pins]
- inp = self._read_pins()
- return [bool(inp & (1<<pin)) for pin in pins]