KevinMidboe/python-gpiozero
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Fix #140, fix #69, fix #185

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This PR adds a software SPI implementation. Firstly this removes the
absolute necessity for spidev (#140), which also means when it's not
present things still work (effectively fixes #185), and also enables any
four pins to be used for SPI devices (which don't require the hardware
implementation).

The software implementation is simplistic but still supports clock
polarity and phase, select-high, and variable bits per word. However it
doesn't allow precise speeds to be implemented because it just wibbles
the clock as fast as it can (which being pure Python isn't actually that
fast).

Finally, because this PR involves creating a framework for "shared"
devices (like SPI devices with multiple channels), it made sense to bung
Energenie (#69) in as wells as this is a really simple shared device.
This commit is contained in:
Dave Jones
2016-02-12 22:55:41 +00:00
parent e09e21a42e
commit 759a6a58e6
48 changed files with 1996 additions and 1076 deletions
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29
gpiozero/exc.py
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@@ -10,14 +10,32 @@ str = type('')
class GPIOZeroError(Exception):
"Base class for all exceptions in GPIO Zero"
class DeviceClosed(GPIOZeroError):
"Error raised when an operation is attempted on a closed device"
class CompositeDeviceError(GPIOZeroError):
"Base class for errors specific to the CompositeDevice hierarchy"
class CompositeDeviceBadName(CompositeDeviceError, ValueError):
"Error raised when a composite device is constructed with a reserved name"
class EnergenieSocketMissing(CompositeDeviceError, ValueError):
"Error raised when socket number is not specified"
class EnergenieBadSocket(CompositeDeviceError, ValueError):
"Error raised when an invalid socket number is passed to :class:`Energenie`"
class SPIError(GPIOZeroError):
"Base class for errors related to the SPI implementation"
class SPIBadArgs(SPIError, ValueError):
"Error raised when invalid arguments are given while constructing :class:`SPIDevice`"
class GPIODeviceError(GPIOZeroError):
"Base class for errors specific to the GPIODevice hierarchy"
class GPIODeviceClosed(GPIODeviceError):
"Error raised when an operation is attempted on a closed device"
"Deprecated descendent of :exc:`DeviceClosed`"
class GPIOPinInUse(GPIODeviceError):
"Error raised when attempting to use a pin already in use by another device"
@@ -82,3 +100,12 @@ class PinPWMUnsupported(PinPWMError, AttributeError):
class PinPWMFixedValue(PinPWMError, AttributeError):
"Error raised when attempting to initialize PWM on an input pin"
class GPIOZeroWarning(Warning):
"Base class for all warnings in GPIO Zero"
class SPIWarning(GPIOZeroWarning):
"Base class for warnings related to the SPI implementation"
class SPISoftwareFallback(SPIWarning):
"Warning raised when falling back to the software implementation"