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If sets are not enabled, set literals lead to SyntaxError during parsing,
so it requires feature_check. Set tests are skipped based on set_*.py
pattern.

Otherwise, they serve reoccurring source of copy-paste mistakes and
breaking nanbox build.

Starting at esp.flash_user_start(), the reserved sectors are for general
purpose use, for example for native code generation.  There is currently
one sector reserved as such.

With warnings of need to close files, sockets, etc.

The driver seems to be be enabling the pullup resistor in most places, but
not this one. Making this one little change allows onewire devices to be
used with no external pullup resistor.

Should allow to diagnose/try to recover FS easier.

This makes unix "uselect" compatible with baremetal "uselect". Previosuly,
unix version accepted file/socket objects, but internally converted that
to file descriptors, and that's what .poll() returned. To acheive new
behavior, file-like objects are stored internally in an array, in addition
to existing array of struct pollfd. This array is created only on first
case of file-like object being passed to .register(). If only raw fd's are
passed, there will be no additional memory used comparing to the original
implementation.

Add a "Getting the firmware" section to better describe how to get hold of
the MicroPython firmware, especially if you have a 512kb module.

Try to put sections in more logical order, and information about cc3200tool
to be the default flashing method.

cc3200tool, https://github.com/ALLTERCO/cc3200tool is a (mostly, some
binary blobs present) open-source, Linux-friendly tool to flash a cc3200
devices. It's an alternative to fully proprietary, Windows-only Uniflash
from TI.

The provided make targets are for erasing flash, flashing the uPy
bootloader and firmware, and flashing vendor's WiFi firmware "servicepacks"
(the latter needs to be downloaded from vendor side, a link is present
inside Makefile).

There should be target to deploy uPy over wired (UART) connection, and
wired and OTA targets should be named differently.

To allow access and testing without complex access methods like WiFi.
Enabled for both WiPy and TI LaunchXL.

Sys-tick resolution is 1ms and a value of 2 will give a delay between 1ms
and 2ms (whereas a value of 1 gives a delay between 0ms and 1ms, which is
too short).

The HAL_UART_Transmit function has changed in the latest HAL version such
that the Timeout is a timeout for the entire function, rather than a
timeout between characters as it was before.  The HAL function also does
not allow one to reliably tell how many characters were sent before the
timeout (if a timeout occurred).

This patch provides a custom function to do UART transmission, completely
replacing the HAL version, to fix the above-mentioned issues.

One never needs to format integers with a base larger than 16 (but code
can be easily extended beyond this value if needed in the future).

This function should be able to parse integers with any value for the
base, because it is called by int('xxx', base).

UART REPL support was lost in os.dupterm() refactorings, etc. As
os.dupterm() is there, implement UART REPL support at the high level -
if MICROPY_STDIO_UART is set, make default boot.py contain os.dupterm()
call for a UART. This means that changing MICROPY_STDIO_UART value will
also require erasing flash on a module to force boot.py re-creation.