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uart.flush()

flush() will wait until all characters have been sent.
To avoid a permanent lock, a timeout applies depending on the
size of FIFO and the baud rate.

ret = uart.txdone()

ret is True if no transfer is in progress.
ret is False otherwise.

Since uart.write() of the nrf port waits until all bytes but the last
one have been sent, uart.flush() and uart.txdone() are implemented
as empty functions to provide API consistency.

uart.flush()

flush() will always return immediately, even if the last byte
may still be sent.

ret = uart.txdone()

uart.txdone() will always return True, even if the last byte
may still be sent.

Since uart.write() of the STM32 port waits until all bytes have
been sent, uart.flush() and uart.txdone() are implemented as empty
functions to provide API consistency.

uart.flush()

flush() will always return immediately.

ret = uart.txdone()

uart.txdone() will always return True.

uart.flush()

flush() will wait until all characters but the last one have been sent.
It returns while the last character is sent. If needed, the calling
code has to add one character wait time. To avoid a permanent lock,
a timeout applies depending on the size of the FIFO and the baud rate.

ret = uart.txdone()

ret is True if no transfer is in progress. It returns already True when
the last byte of a transfer is sent.
ret is False otherwise.

uart.flush()

flush() will wait until all characters have been sent.To avoid a
permanent lock, a timeout applies depending on the size of txbuf
and the baud rate.

ret = uart.txdone()

ret is True if no transfer is in progress.
ret is False otherwise.

uart.flush()

flush() will wait until all characters have been sent.To
avoid a permanent lock, a timeout applies depending on the
size of txbuf and the baud rate.

ret = uart.txdone()

ret is True if no transfer is in progress.
ret is False otherwise.

uart.flush()

flush() will wait until all characters have been sent. It may return
while the last character is sent. if needed, the calling code has to
add one character wait time. To avoid a permanent lock, a timeout
applies depending on the size of txbuf and the baud rate.

ret = uart.txdone()

ret is True if no transfer is in progress. It may return True if the
last byte of a transfer is sent.
ret is False otherwise.

Quite regularly users complain about unexpected behavior of I2C, calling it
a bug, when in fact the trouble is caused by missing pull-up resistors.  So
this commit adds a note to the documentation, in the slim hope that people
will find and read it.

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

Signed-off-by: Jim Mussared <jim.mussared@gmail.com>
Signed-off-by: Damien George <damien@micropython.org>

Changes are:
- Remove unix- and stm32-specific sections (move unix to its own
  README.md), stm32 was duplicated.
- Add links to GitHub Discussions and Discord.
- Update information about the project.
- Add a getting started section.
- Explain `make submodules`.
Signed-off-by: Jim Mussared <jim.mussared@gmail.com>
Signed-off-by: Damien George <damien@micropython.org>

So that everything is reset and the SD card can be created again after
calling SDCard.deinit() (and after a soft reset).

Fixes issue #8949.
Signed-off-by: Damien George <damien@micropython.org>

Having two separate manifests is confusing.  It's simpler to have the daily
builds use the same configuration as the stable, release builds.
Signed-off-by: Damien George <damien@micropython.org>

There don't seem to be many changes going from v2.1.2 to v2.1.3 of lwIP.
Mostly they are:
- IPv6 fixes and improvements
- changes to apps and other code that MicroPython doesn't use
- comments and tests
- minor bug fixes

In particular there doesn't look to be any change to the API of any
function used by MicroPython.

Network multi tests pass on PYBD_SF2 and PYBD_SF6.  PYBD_SF2, PYBD_SF6 and
PICO_W have unchanged iperf3 performance.  Similar results for networking
on the mimxrt port.
Signed-off-by: Damien George <damien@micropython.org>

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

All uses of this are either tiny strings or not-known-to-be-safe.

Update comments for mp_obj_new_str_copy and mp_obj_new_str_of_type.
Signed-off-by: Jim Mussared <jim.mussared@gmail.com>

The new `mp_obj_new_str_from_utf8_vstr` can be used when you know you
already have a unicode-safe string.
Signed-off-by: Jim Mussared <jim.mussared@gmail.com>

Now that we have `mp_obj_new_str_type_from_vstr` (private helper used by
objstr.c) split from the public API (`mp_obj_new_str_from_vstr`), we can
enforce a unicode check at the public API without incurring a performance
cost on the various objstr.c methods (which are already working on known
unicode-safe strings).
Signed-off-by: Jim Mussared <jim.mussared@gmail.com>

Previously the desired output type was specified.  Now make the type part
of the function name.  Because this function is used in a few places this
saves code size due to smaller call-site.

This makes `mp_obj_new_str_type_from_vstr` a private function of objstr.c
(which is almost the only place where the output type isn't a compile-time
constant).

This saves ~140 bytes on PYBV11.
Signed-off-by: Jim Mussared <jim.mussared@gmail.com>

The existing non-Docker instructions are basically impossible to follow
because the esp-open-sdk does not compile.  Update these instructions to
use the exact toolchain that our CI uses.

Also split the Docker from non-Docker instructions, to avoid confusion
about which commands need to be prefixed.
Signed-off-by: Jim Mussared <jim.mussared@gmail.com>

Signed-off-by: Laurens Valk <laurens@pybricks.com>

These can't be nested, so apply styling separately.
Signed-off-by: Laurens Valk <laurens@pybricks.com>

* `init()` can be called multiple times to reconfigure UART.
* After `deinit()` it is impossible to call `init()` again.
Signed-off-by: Tomasz 'CeDeROM' CEDRO <tomek@cedro.info>

Signed-off-by: Tomasz 'CeDeROM' CEDRO <tomek@cedro.info>

Updated some of the CPython feature differences:
- Updated status of some features.
- Added CSS to fix table widths to 100% and word wrap.
- Specified explicit table column ratios to improve layout appearance.
- Added missing references to anchors.
- Better consistency with use of formatting and case.

Also document support for 'cp :a :b'.
Signed-off-by: Damien George <damien@micropython.org>

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

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

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

It's no longer used by any port.
Signed-off-by: Damien George <damien@micropython.org>

It has been about 8 years since support for this chip was added.  Reasons
to remove it are:
- It is no longer easy to obtain this part.
- There are now many other options for WiFi.
- It's not a good use of developer time to maintain it.
Signed-off-by: Damien George <damien@micropython.org>

Not safe to use mp_hal_delay_ms before boot if threading is enabled,
because threading will not have been initialised, and
MICROPY_EVENT_POLL_HOOK assumes threading is initialised.

HAL_Delay doesn't call MICROPY_EVENT_POLL_HOOK, but is still
power-efficient like mp_hal_delay_ms (unlike mp_hal_delay_us).

Fixes #7816.
Signed-off-by: Jim Mussared <jim.mussared@gmail.com>

Rather than having the autobuild know about the particular variants, have
the mpconfigboard.mk describe them and make autobuild discover them
automatically.

Adds a "query-variants" target to stm32/Makefile to allow the set of
possible variants to be queried.

Removes pybv3 from the autobuild as this isn't use by the downloads page.
Signed-off-by: Jim Mussared <jim.mussared@gmail.com>

If mboot is built with support for packing (signing/encryption) it needs up
to 32KiB.  So for simplicity increase the mboot region to 32KiB
unconditionally for WB55 boards (custom WB55 board configurations can still
provide their own linker scripts to override this).

So that SDRAM can be used as the heap on ARDUINO_PORTENTA_H7, for example.

Fixes issue #9087.

Following the usual style of instantiation and init().

It used to be 10 bit times, which is too short.  The break state must be
longer than a regular character time, at least 13 bit times.  This is now
implemented by reducing the baudrate while sending the "0".  The break time
will now vary with data length and parity setting, but will at least be 15
bit times.

Tested with a GENERIC_SPIRAM, GENERIC_C3 and UM_TINYS2 board.