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Which Wiznet chip to use is a compile-time option: MICROPY_PY_WIZNET5K
should be set to either 5200 or 5500 to support either one of these
Ethernet chips.  The driver is called network.WIZNET5K in both cases.

Note that this commit introduces a breaking-change at the build level
because previously the valid values for MICROPY_PY_WIZNET5K were 0 and 1
but now they are 0, 5200 and 5500.

This patch implements the basic SPI read/write functions for the W5500
chip.  It also allows _WIZCHIP_ to be configured externally to select the
specific Wiznet chip.

Use MICROPY_THREAD_YIELD() instead of HAL_Delay in busy waiting to improve
the performance of connect, send, recv, sento and recvfrom.

This matches the behaviour of getaddrinfo in extmod/modlwip.c.

To increase visibility of Contributors' Guidelines and Code Conventions
docs.

The uos.dupterm() signature and behaviour is updated to reflect the latest
enhancements in the docs.  It has minor backwards incompatibility in that
it no longer accepts zero arguments.

The dupterm_rx helper function is moved from esp8266 to extmod and
generalised to support multiple dupterm slots.

A port can specify multiple slots by defining the MICROPY_PY_OS_DUPTERM
config macro to an integer, being the number of slots it wants to have;
0 means to disable the dupterm feature altogether.

The unix and esp8266 ports are updated to work with the new interface and
are otherwise unchanged with respect to functionality.

So that characters can be buffered before the USB device is connected
(restoring behviour of the driver before recent state refactoring).

This patch also makes the code more concise by combining the checks for the
password length.

Reduces code size by a tiny bit.

NaN may have the sign bit set but it has no meaning, so don't print it out.

So that a pointer to it can be passed as a pointer to math_generic_1.  This
patch also makes the function work for single and double precision floating
point.

This patch changes how most of the plain math functions are implemented:
there are now two generic math wrapper functions that take a pointer to a
math function (like sin, cos) and perform the necessary conversion to and
from MicroPython types.  This helps to reduce code size.  The generic
functions can also check for math domain errors in a generic way, by
testing if the result is NaN or infinity combined with finite inputs.

The result is that, with this patch, all math functions now have full
domain error checking (even gamma and lgamma) and code size has decreased
for most ports.  Code size changes in bytes for those with the math module
are:

   unix x64:  -432
unix nanbox:  -792
      stm32:   -88
    esp8266:   +12

Tests are also added to check domain errors are handled correctly.

Add these methods to this "GPIO output emulated with console prints"
config.

While this console API improves handling on real hardware boards
(e.g. clipboard paste is much more reliable, as well as programmatic
communication), it vice-versa poses problems under QEMU, apparently
because it doesn't emulate UART interrupt handling faithfully. That
leads to inability to run the testsuite on QEMU at all. To work that
around, we have to suuport both old and new console routines, and use
the old ones under QEMU.

We want to close communication object even if there were exceptions
somewhere in the code. This is important for --device exec:/execpty:
which may otherwise leave processing running in the background.

Ideally, these should be configurable from Python (using network module),
but as that doesn't exist, we better off using Zephyr's native bootstrap
configuration facility.

The poweroff() and poweron() methods are used to do soft power control of
the display, and this patch makes these methods work the same for both I2C
and SPI interfaces.

After a poweroff(), the poweron() method does a soft power-on and any
previous state of the display persists.

As it may contain newlines, etc.

When wiznet5k_socket_accept is called, if a socket is established, get the
IP address of the socket.

The binary and unary ops have changed bytecode encoding.