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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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