By moving code to ITCM, like vm, gc, parse, runtime.  The change affects
mostly the execution speed of MicroPython code.  The speed is increased by
up to a factor of 6, especially for MCU with small cache.

There is no release of IDF v4.4 yet but master is now on v5.0-dev so a
specific commit must be chosen to stick to v4.4.

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

This forwards through directly to the NimBLE and BTStack connect functions.

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

We will use this fork for adding further features and patches to support
MicroPython.

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

We're using the MicroPython fork of NimBLE, which on the
`micropython_1_4_0` branch re-adds support for 64-bit targets and fixes
initialisation of g_msys_pool_list.

Also updates modbluetooth_nimble.c to suit v1.4.

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

This was fixed in NimBLE 1.4.

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

This will be used by https://micropython.org/download/ to generate the
full listing of boards and firmware files.

Optionally supports a board.md for additional customisation of the
download page, as well as deploy.md for flashing instructions.

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

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

In particular the UM S2 boards (and update the features list).

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

Following on from ba94025, the change here
makes output about 15 times faster (now up to about 550 kbytes/sec).

tinyusb_cdcacm_write_queue will return the number of bytes written, so
there's no need to use tud_cdc_n_write_available.

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

Prior to this commit IRQs on STM32F4 could be lost because SR is cleared by
reading SR then reading DR.  For example, if both RXNE and IDLE IRQs were
active upon entry to the IRQ handler, then IDLE is lost because the code
that handles RXNE comes first and accidentally clears SR (by reading SR
then DR to get the incoming character).

This commit fixes this problem by making the IRQ handler more atomic in the
following operations:
- get current IRQ status flags
- deal with RX character
- clear remaining status flags
- call user handler

On the STM32F4 it's very hard to get this right because the only way to
clear IRQ status flags is to read SR then DR, but the read of DR may read
some data which should remain in the register until the user wants to read
it.  And it won't work to cache the read because RTS/CTS flow control will
then not work.  So instead the new code disables interrupts if the DR is
full and waits for the user to read it before reenabling the interrupts.

Fixes issue mentioned in adafruit#4599 and adafruit#6082.

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

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

To simplify the config.  This commit does not change the build.

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

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

Some of these will later be moved to CORE or BASIC, but EXTRA is a good
starting point based on what stm32 uses.

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

This commit is a no-op change.  Future improvements can come from making
individual boards use CORE or BASIC.

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

This commit is a no-op change to simplify existing config.

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

This is an stm32-specific feature that's accessed via the pyb module, so
not something that will be widely enabled.

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

Computed goto costs 1800 bytes for 5-10% performance.

Map caching and attr fast path costs 130 bytes for up to 30%.

Net effect of those three optimisations:
bm_chaos.py         +16.059% (+/-0.09%)
bm_fannkuch.py      +11.145% (+/-0.01%)
bm_fft.py           +14.604% (+/-0.01%)
bm_float.py         +26.849% (+/-0.08%)
bm_hexiom.py        +34.039% (+/-0.03%)
bm_nqueens.py       +18.333% (+/-0.06%)
bm_pidigits.py       +4.472% (+/-0.03%)
misc_aes.py         +28.765% (+/-0.09%)
misc_mandel.py      +27.116% (+/-0.05%)
misc_pystone.py     +40.299% (+/-0.20%)
misc_raytrace.py    +22.812% (+/-0.07%)

Also enable other EXTRA-level optimisations (module const, return_if_expr,
triple_tuple_assign, factorial, mpz bitwise).

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

This makes it possible for cooperative multitasking systems to keep running
event loops during garbage collector operations.

For example, this can be used to ensure that a motor control loop runs
approximately each 5 ms.  Without this hook, the loop time can jump to
about 15 ms.

Addresses adafruit#3475.

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

Word-size specific configuration is now done automatically, so it no longer
requires this to match the ARM configuration.

Also it's less common to have 32-bit compilation support installed, so this
will make it work "out of the box" for more people.

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

.. which occurs during qstring generation.

.. -mcache-lookup-bc is gone and forgotten

.. and remove a stanza for the "cache map lookup in bytecode" option,
which has been removed by upstream in 1.18; it's superceded by these
other improvements.