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This fixes #345 and fixes #215.
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cc3200 has been updated to conform to the API and now returns None.
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The cc3200 port is now similar enough to the standard machine.I2C API so
that all conditionals can be removed.
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Since eaef6b5324fa2ff425802d4abeea45aa945bfc14 writes are used instead of
reads.
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The memory read/write I2C functions now take an optional keyword-only
parameter that specifies the number of bits in the memory address.
Only mem-addrs that are a multiple of 8-bits are supported (otherwise
the behaviour is undefined).
Due to the integer type used for the address, for values larger than 32
bits, only 32 bits of address will be sent, and the rest will be padded
with 0s. Right now no exception is raised when that happens. For values
smaller than 8, no address is sent. Also no exception then.
Tested with a VL6180 sensor, which has 16-bit register addresses.
Due to code refactoring, this patch reduces stmhal and esp8266 builds
by about 50 bytes.
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With currentmodule:: set properly, none are needed. Extra "machine." prefix
produces wrong indexing data.
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Class designator will be used as is in indexes, so must match actual class
name.
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Makes sure that classes described in these separate files are properly
designated as belonging to "machine" module in indexes.
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This machine.I2C documentation is now closer to a more port-neutral
description, although there are still differences between WiPy and
ESP8266.
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A standard I2C address is 7 bits but addresses 0b0000xxx and 0b1111xxx
are reserved. The scan() method is changed to reflect this, along with
the docs.
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