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Fixes issue #7631.
Signed-off-by: Damien George <damien@micropython.org>

Release the GIL while waiting for SPI transfers to complete to allow other
threads to make progress.

Fixes #7662.

To make machine.Signal work correctly (among other things).  The solution
is taken over from the rp2 port.

Signed-off-by: Philipp Ebensberger

This tests both sending indications/notifications from a server to
subscribed clients via gatts_write(...,send_update=True) and subscribing
from a client.
Signed-off-by: Jim Mussared <jim.mussared@gmail.com>

This allows the write to trigger a notification or indication, but only to
subscribed clients. This is different to gatts_notify/gatts_indicate,
which will unconditionally notify/indicate.
Signed-off-by: Jim Mussared <jim.mussared@gmail.com>

Signed-off-by: Jim Mussared <jim.mussared@gmail.com>

This implements (most of) the PEP-498 spec for f-strings and is based on
https://github.com/micropython/micropython/pull/4998 by @klardotsh.

It is implemented in the lexer as a syntax translation to `str.format`:
  f"{a}" --> "{}".format(a)

It also supports:
  f"{a=}" --> "a={}".format(a)

This is done by extracting the arguments into a temporary vstr buffer,
then after the string has been tokenized, the lexer input queue is saved
and the contents of the temporary vstr buffer are injected into the lexer
instead.

There are four main limitations:
- raw f-strings (`fr` or `rf` prefixes) are not supported and will raise
  `SyntaxError: raw f-strings are not supported`.

- literal concatenation of f-strings with adjacent strings will fail
    "{}" f"{a}" --> "{}{}".format(a)    (str.format will incorrectly use
                                         the braces from the non-f-string)
    f"{a}" f"{a}" --> "{}".format(a) "{}".format(a) (cannot concatenate)

- PEP-498 requires the full parser to understand the interpolated
  argument, however because this entirely runs in the lexer it cannot
  resolve nested braces in expressions like
    f"{'}'}"

- The !r, !s, and !a conversions are not supported.

Includes tests and cpydiffs.
Signed-off-by: Jim Mussared <jim.mussared@gmail.com>

See issue #7480.
Signed-off-by: Damien George <damien@micropython.org>

Which can be the case on Windows and macOS for certain serial devices.

Fixes issue #7636.
Signed-off-by: Damien George <damien@micropython.org>

The correct callback-deregister functions must be called dependent on the
socket type, otherwise resources may not be freed correctly.
Signed-off-by: Damien George <damien@micropython.org>

Test instances can now use the following methods to synchronise their
execution:

    multitest.broadcast("sync message")
    multitest.wait("sync message")
Signed-off-by: Damien George <damien@micropython.org>

This allows nrf devices to load .mpy files.  And nrf52840 and nrf9160 based
boards also support compiling and loading native code.

Adds section about extending built-in modules from Python.
Signed-off-by: Jim Mussared <jim.mussared@gmail.com>

Signed-off-by: Jim Mussared <jim.mussared@gmail.com>

Anywhere a module is mentioned, use its "non-u" name for consistency.

The "import module" vs "import umodule" is something of a FAQ, and this
commit intends to help clear that up.  As a first approximation MicroPython
is Python, and so imports should work the same as Python and use the same
name, to a first approximation.  The u-version of a module is a detail that
can be learned later on, when the user wants to understand more and have
finer control over importing.

Existing Python code should just work, as much as it is possible to do that
within the constraints of embedded systems, and the MicroPython
documentation should match the idiomatic way to write Python code.

With universal weak links for modules (via MICROPY_MODULE_WEAK_LINKS) users
can consistently use "import foo" across all ports (with the exception of
the minimal ports).  And the ability to override/extend via "foo.py"
continues to work well.
Signed-off-by: Jim Mussared <jim.mussared@gmail.com>

This is a simple rename of the files, no content changes
(other than updating index.rst to use the new paths)
Signed-off-by: Jim Mussared <jim.mussared@gmail.com>

Signed-off-by: Damien George <damien@micropython.org>

Includes documentation for Zephyr specific modules (zephyr and zsensor),
classes (DiskAccess and FlashArea), and functions.
Signed-off-by: Julia Hathaway <julia.hathaway@nxp.com>

Includes an introduction to using the Zephyr port on MicroPython.  The
quickref details examples of how to use each module the port currently
supports.  The tutorial provides additional details for Zephyr specific
modules.
Signed-off-by: Julia Hathaway <julia.hathaway@nxp.com>

This commit creates a new stm32 board for the NUCLEO_H743ZI2, which is the
current version of this from ST.  This is a modified copy of the
NUCLEO_H743ZI board, and the ZI2 board differs in a few minor ways:

- LED2 has moved from PB7 to PE1 and is now yellow rather than blue
- the USB power enable has moved from PG6 to PG10
- the USER button is now pulled down

This allows boards to add frozen modules, or bypass the port manifest
entirely.

So that it works on ESP32C3, which has the bootloader at 0x0.

Fixes issue #7565.
Signed-off-by: Damien George <damien@micropython.org>

This function can be used to enable and disable the DC/DC converter with or
without the Bluetooth stack enabled.  It can also be used to query the
current state of the DC/DC.

This commit also adds a definition of ARRAY_SIZE needed by nrfx HAL-layer.

This was missed in the initial implementation of the uos module.
Signed-off-by: Damien George <damien@micropython.org>

Enable LittleFS v2 for all targets, except nrf51 targets when SoftDevice is
present.

extmod/vfs_lfs.c needs to resolve `mp_hal_time_ns()` in order to calculate
a timestamp from 1970 epoch.  A wall clock is not available in the nrf
port, hence the function is implemented to resolve compilation linkage
error.  The function always return 0.

Set the default manifest to "modules/manifest.py".  This includes files
from the folder "modules/scripts".  The manifest default value is overriden
by all nrf51 boards that have SoftDevice present (SD=s110) to save flash.

Also add "modules/manifest.py" which is set to freeze
"modules/scripts/_mkfs.py".

Add a helper script _mkfs.py which automatically formats the file system if
nrf.Flash() is located and a VFS file system has been included in the
compilation.

The precedence is: first LFS1, LFS2 then FAT.

Update the Makefile to handle FROZEN_MANIFEST, and the README with some
small samples on how to use freeze manifests.  And add BOARD_DIR to the
Makefile which can be referenced in boards/<board>/mpconfigboard.mk to
include a board specific manifest.

Enable the following features for all boards except
nrf51 boards with SoftDevice present:

- MICROPY_VFS
- MICROPY_PY_NRF
- MICROPY_HW_ENABLE_INTERNAL_FLASH_STORAGE

Enable MICROPY_PY_IO_FILEIO if MICROPY_VFS_FAT, MICROPY_VFS_LFS1
or MICROPY_VFS2 has been enabled.