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Documents the micropython.cmake file required to make user C modules
compatible with the CMake build system.
Signed-off-by: Phil Howard <phil@pimoroni.com>

examples/usercmodule/micropython.cmake:

Root micropython.cmake file is responsible for including modules.

examples/usercmodule/cexample/micropython.cmake:
examples/usercmodule/cppexample/micropython.cmake:

Module micropython.cmake files define the target and link it to usermod.
Signed-off-by: Phil Howard <phil@pimoroni.com>

The parts that are generic are added to py/ so they can be used by other
ports that use CMake.

py/usermod.cmake:

* Creates a usermod target to hang user C/CXX modules from.
* Gathers sources from user C/CXX modules and libs for QSTR scan.

ports/rp2/CMakeLists.txt:

* Includes py/usermod.cmake.
* Links the resulting usermod library to the MicroPython target.

py/mkrules.cmake:

Add cxxflags to qstr.i.last custom command for CXX modules:

* MICROPY_CPP_FLAGS so CXX modules will find includes.
* -DNO_QSTR to fix fatal error missing "genhdr/qstrdefs.generated.h".

Usage:

The rp2 port can be linked against user C modules by running:

make USER_C_MODULES=/path/to/module/micropython.cmake

CMake will print a list of included modules.
Co-authored-by: Graham Sanderson <graham.sanderson@raspberrypi.org>
Co-authored-by: Michael O'Cleirigh <michael.ocleirigh@rivulet.ca>
Signed-off-by: Phil Howard <phil@pimoroni.com>

Required for user C++ code to build successfully against ports/rp2.
Signed-off-by: Phil Howard <phil@pimoroni.com>

For consistency with all other object types in the core.
Signed-off-by: Damien George <damien@micropython.org>

This commit simplifies and cleans up the bare-arm port, and adds just
enough system and library code to make it execute on an STM32F405 MCU.

The mpconfigport.h configuration is simplified to just specify those
configuration values that are different from the defaults.  And the
addition of -fdata-sections and -ffunction-sections means the final
firmware is smaller than it previously was, by about 4200 bytes.

A README is also added.
Signed-off-by: Damien George <damien@micropython.org>

mp_printf should be used to print the prefix because it's also used in
mp_bytecode_print2 (otherwise, depending on the system, different output
streams may be used).

Also print the current thread state when threading is enabled to easily see
which thread executes what opcode.
Signed-off-by: Damien George <damien@micropython.org>

So a board can provide custom qstr definitions if needed.
Signed-off-by: Damien George <damien@micropython.org>

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

Otherwise it can lead to inconsistent results running subsequent tests.
Signed-off-by: Damien George <damien@micropython.org>

This helps to reduce memory fragmentation, by freeing the heap data as soon
as it is not needed.  It also helps the compiler keeps a reference to the
beginning of both arrays, which need to be traceable by the GC (otherwise
some compilers may optimise this reference to something else).
Signed-off-by: Damien George <damien@micropython.org>

The GNU Make dir command uses spaces as item separator so it does not
work for e.g building the STM32 port on Cygwin with a default Arm
installation in "c:/program files (x86)/GNU Arm Embedded Toolchain".
Fix by using POSIX dirname on a quoted path instead.

Add most formatting-only commits to this file so that when used with
git blame, these commits are excluded and the output shows only the
interesting bits.

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

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

Fixes issue #6863.
Signed-off-by: Damien George <damien@micropython.org>

This brings the port's configuration closer to the stm32 and esp32 ports.
Signed-off-by: Damien George <damien@micropython.org>

Fixes #6991.

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

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

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

The default pins can be optionally configured by a board.

Fixes issue #6974.
Signed-off-by: Damien George <damien@micropython.org>

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

When UART is used for REPL and the MCU frequency is changed, the UART
has to be re-initialised.  Besides that the UART may have to be recreated
after a frequency change, but with USB REPL this is not a problem.

Thanks to @HermannSW for spotting and providing the change.

Using the standard machine.freq().

The safe ranges tested were 10 and 12-270MHz, at which USB REPL still
worked.  Requested settings can be checked with the script:
pico-sdk/src/rp2_common/hardware_clocks/scripts/vcocalc.py.  At frequencies
like 300MHz the script still signaled OK, but USB did not work any more.

sm.get(buf) was waiting for one item more than the length of the supplied
buffer.  Even if this item was not stored, sm_get would block trying to get
an item from the RX fifo.

As part of the fix, the edge case for a zero length buffer was moved up to
the section where the function arguments are handled.  In case of a zero
length buffer, sm.get() now returns immediately that buffer.

The bitmasks supplied for initialization of out/set/sideset were only 8 bit
instead of 32.  This resulted in an error, that not more than 8 consecutive
pins would get initialized.

Fixes issue #6933.

Usage as in the other ports:

    keyword "invert"
    constants: INV_TX and INV_RX

Sample: uart = UART(1, invert=UART.INV_TX | UART.INV_RX)

Allows interfacing with SD cards, for example.

From a version numbering point of view this is a downgrade (2.17.0 ->
2.16.x).  However the latest commit for version 2.17.0 is from March 2019
and no further minor release happened after 2.17.0.  This version is EOL.
2.16.x though is still actively maintained as a long term release, hence
security and stability fixes are still being backported, including
compatibility with upcoming compiler releases.

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

Fixes issue #6342.

This allows the user to enable wake-up sources using the EWUP bits, on F7
MCUs.

Disabling the wake-up sources while clearing the wake-up flags follows the
reference manual and ST examples.