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Commit 41739506 removed automatic building
of mpy-cross, which rebuilt it whenever any of its dependent source files
changed.

But needing to build mpy-cross, and not knowing how, is a frequent issue.
This commit aims to help by automatically building mpy-cross only if it
doesn't exist.  For Makefiles it uses an order-only prerequisite, while
for CMake it uses a custom command.

If MICROPY_MPYCROSS (which is what makemanifest.py uses to locate the
mpy-cross executable) is defined in the environment then automatic build
will not be attempted, allowing a way to prevent this auto-build if needed.

Thanks to Trammell Hudson aka @osresearch for the original idea; see #5760.
Signed-off-by: Damien George <damien@micropython.org>

Basically just copied ujson_dump(s).py and added various valid/invalid
separator tests.
Signed-off-by: Peter Züger <zueger.peter@icloud.com>

Optionally enabled via MICROPY_PY_UJSON_SEPARATORS.  Enabled by default.

For dump, make sure mp_get_stream_raise is called after
mod_ujson_separators since CPython does it in this order (if both
separators and stream are invalid, separators will raise an exception
first).

Add separators argument in the docs as well.
Signed-off-by: Peter Züger <zueger.peter@icloud.com>
Signed-off-by: Damien George <damien@micropython.org>

Addresses issues #2697 and #5329.
Signed-off-by: Damien George <damien@micropython.org>

Reverse operations are supported on stm32 and rp2, and esp32 has enough
space to also enable inplace operations, to make it complete.
Signed-off-by: Jim Mussared <jim.mussared@gmail.com>

For rev 7+ boards with 16MB of flash.  Partition table allocates 2.4 MiB
for MicroPython, 11 MiB for the filesystem.

This enables optional support for the hardware UART to use the RTS and/or
CTS pins for flow control.

The new "flow" constructor keyword specifies a bitmask of RTS and/or CTS.
This matches the interface used by machine.UART on stm32 and rp2.

Previously on ESP32 it was possible to specify which pins to use for the
RTS and CTS signals, but hardware flow control was never functional: CTS
was not checked before transmitting bytes, and RTS was always driven high
(signalling no buffer space available).  With this patch, CTS and RTS both
operate as expected.

This also includes an update to the machine.UART documentation.
Signed-off-by: Will Sowerbutts <will@sowerbutts.com>

By defining MICROPY_HW_USB_VID and MICROPY_HW_USB_PID.

Commit e33bc597 ("py: Remove calls to file reader functions when these
are disabled.") changed the condition for one caller of
do_execute_raw_code() from

    MICROPY_PERSISTENT_CODE_LOAD

to

    MICROPY_HAS_FILE_READER && MICROPY_PERSISTENT_CODE_LOAD

The condition that enables compiling the function itself needs to be
changed to match.
Signed-off-by: David Lechner <david@pybricks.com>

Hyperflash is used by the MIMXRT1050_EVKB, MIMXRT1060_EVK and
MIMXRT1064_EVK boards.

This commit includes:
- add support for Hyperflash
- modify MIMXRT1060_EVK and MIMXRT1064_EVK to change from QSPI to
  hyperflash.
- minor incidental changes to other boards so they still build

Note: Erasing a sector on the hyperflash is slow. It takes about a second,
which seems too long, but matches the data sheet.

Rudimentary support for various address families.
Signed-off-by: oclyke <oclyke@gmail.com>

Also mention mpremote as a way to access the REPL.
Signed-off-by: Damien George <damien@micropython.org>

Add basic support for LEGO HUB NO.6 (e.g. LEGO SPIKE Prime, LEGO MINDSTORMS
Robot Inventor).

See README.md for details.

Thanks to @dpgeorge for helping put this together.
Signed-off-by: Tobias Thyrrestrup <tt@LEGO.com>

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

By selecting a larger prescaler when needed.
Signed-off-by: Damien George <damien@micropython.org>

It needs to use a different function because the formula to compute the
baudrate on LPUART1 is different to a normal UART.

Fixes issue #7466.
Signed-off-by: Damien George <damien@micropython.org>

Prior to this fix, if the UART hardware FIFO had a few chars but still
below the FIFO trigger threshold, and the ringbuf was empty, the read
function would timeout if timeout==0 (the default timeout).

This fix follows the suggestion of @iabdalkader.

The RX IRQ does not trigger if the FIFO is less than the trigger level, in
which case characters may be available in the FIFO, yet not in the ringbuf,
and the ioctl returns false.

Signed-off-by: Chris Wilson <christopher.david.wilson@gmail.com>

When l2cap_send detects that the sys mempool is running low (used to store
the outgoing HCI payloads), it will report stalled back to the application,
and then only unstall once these HCI payloads have been sent.

This prevents a situation where a remote receiver with very large MTU can
cause NimBLE to queue up more than MYNEWT_VAL_MSYS_1_BLOCK_COUNT (i.e. 12)
payloads, causing further attempts to send to fail with ENOMEM (even though
the channel is not stalled and we have room in the channel mbufs). The
regular credit/stall flow control is not effective here because the
receiver's MTU is large enough that it will not activate (i.e. there are
lots of credits available).

Thresholds of 1/2 (stall) and 1/4 (unstall) chosen to allow headroom for
other payloads (e.g. notifications) and that when a regular stall occurs it
might keep sending (and creating more payloads) in the background.

Signed-off-by: Michel Bouwmans <m.bouwmans@ep-games.eu>

Fixes issue #7534.
Signed-off-by: Michel Bouwmans <m.bouwmans@ep-games.eu>

Previously a subclass of a type that didn't implement unary_op, or didn't
handle MP_UNARY_OP_BOOL, would raise TypeError on bool conversion.

Fixes #5677.

Fixes issue #5750.
Signed-off-by: Damien George <damien@micropython.org>