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So long as a port defines relevant mp_hal_pin_xxx functions (and delay) it
can make use of this software SPI class without the need for additional
code.

So it compiles with the latest F7 hal.

These files originate from the STM32Cube_FW_F7_V1.5.0 software package
from ST.  Newlines are unixified and trailing whitespace is removed.

Previous to this patch trying to construct, but not init, a UART that
didn't exist on the target board would actually succeed.  Only when
initialising the UART would it then raise an exception that the UART does
not exist.

This patch adds an explicit check that the constructed UART does in fact
exist for the given board.

This follows the pattern of other peripherals (I2C, SPI) to specify the
pins using pin objects instead of a pair of GPIO port and pin number.  It
makes it easier to customise the UART pins for a particular board.

websocket_helper.py is used by webrepl.  If webrepl is enabled and
websocket_helper.py is not frozen bytecode it leads to heap
fragmentation.

These are basic drawing primitives.  They work in a generic way on all
framebuf formats by calling the underlying setpixel or fill_rect C-level
primitives.

The STM32 F7 and L4 boards use significantly different code to the F4
boards so it's important to test them with CI.  To keep CI build times
within a reasonable limit the STM32F4DISC board is no longer built, it's
anyway very similar to the standard F4 build for PYBv1.0.

Rename recently introduced "sync" method to "flush" for consistency with
usual files.

In 1.6, Zephyr switched to "unified kernel" and new API set. Older kernel
API is supported, but marked as deprecated and leads to warnings.

If you have longish operations on the db (such as logging data) it may
be desirable to periodically sync the database to the disk.  The added
btree.sync() method merely exposes the berkley __bt_sync function to the
user.

Select and poll will now work on socket objects.

Implementation of polling may need further fine tuning, but basic
functionality works (tested on esp8266).

To make moduselect be usable by any port.

The constants MP_IOCTL_POLL_xxx, which were stmhal-specific, are moved
from stmhal/pybioctl.h (now deleted) to py/stream.h.  And they are renamed
to MP_STREAM_POLL_xxx to be consistent with other such constants.

All uses of these constants have been updated.

If the destination of os.rename() exists then it will be overwritten if it
is a file.  This is the POSIX behaviour, which is also the CPython
behaviour, and so we follow suit.

See issue #2598 for discussion.

Add 2 macros in mphalport.h that clean and invalidate data caches only on
STM32F7 MCUs.  They are needed to ensure the cache coherency before/after
DMA transferts.

* MP_HAL_CLEANINVALIDATE_DCACHE cleans and invalidate the data cache. It
  must be called before starting a DMA transfer from the peripheral to the
  RAM memory.

* MP_HAL_CLEAN_DCACHE cleans the data cache.  It must be called before
  starting a DMA transfert from the RAM memory to the peripheral.

These macros are called in sdcard.c, before reading from and writing to
the SDCard, when DMA is used.

Fill is a very common operation (eg to clear the screen) and it is worth
optimising it, by providing a specialised fill_rect function for each
framebuffer format.

This patch improved the speed of fill by 10 times for a 16-bit display
with 160*128 pixels.

For backwards compatibility.  It simple creates a frame buffer with the
MVLSB format.

Rename FrameBuffer1 into FrameBuffer and make it handle different bit
depths via a method table that has getpixel and setpixel.  Currently
supported formats are MVLSB (monochrome, vertical, LSB) and RGB565.

Also add blit() and fill_rect() methods.

The temperature sensor on F4 and F7 MCUs is mostly, but not always, on
channel 16.  To retain compatibility across all these MCUs this patch
maps the user-facing channel 16 to the internal temperature sensor.