The backtrace cannot be given because it relies on the validity
of the qstr data structures on the heap which may have been
corrupted.
In fact, it still can crash hard when the bytecode itself is
overwritten. To fix, we'd need a way to skip gathering the
backtrace completely.
This also increases the default stack size on M4s so it can
accomodate the stack needed by ASF4s nvm API.
This started while adding USB MIDI support (and descriptor support is
in this change.) When seeing that I'd have to implement the MIDI class
logic twice, once for atmel-samd and once for nrf, I decided to refactor
the USB stack so its shared across ports. This has led to a number of
changes that remove items from the ports folder and move them into
supervisor.
Furthermore, we had external SPI flash support for nrf pending so I
factored out the connection between the usb stack and the flash API as
well. This PR also includes the QSPI support for nRF.
This enables various things in order to support the CPython standard library.
MICROPY_PY_BUILTINS_NOTIMPLEMENTED:
Support NotImplemented for easy conversion of stdlib.
It doesn't do fallbacks though, only raises TypeError.
MICROPY_PY_COLLECTIONS_ORDEREDDICT:
collections.OrderedDict
MICROPY_PY_FUNCTION_ATTRS:
Support function.__name__ for use as key in the function attribute workaround.
MICROPY_PY_IO:
uio module: BytesIO, FileIO, StringIO, TextIOWrapper
Also add 'io' alias.
MICROPY_PY_REVERSE_SPECIAL_METHODS:
Support the __r*__ special methods.
MICROPY_PY_SYS_EXC_INFO:
sys.exc_info() used by unittest when collecting exceptions.
MICROPY_CPYTHON_COMPAT:
Some of the things it adds:
>>> object.__init__
<function>
>>> object.__new__
<function>
>>> object.__class__
<class 'type'>
>>> object().__class__
<class 'object'>
>>> object.__name__
'object'
>>> 'Hello'.encode()
b'Hello'
>>> b'Hello'.decode()
'Hello'
Named tuple field names from string:
namedtuple('Point', 'x y')
Add alias for uerrno so the user doesn't have to know about the
CircuitPython special names for the module.
Make os and time weak modules (aliases) making it possible to add
functionality to those modules written in python.
Example:
'import os' will now look in the path for an os module and if not found
it will import the builtin module. An os module written in python will
import the builtin module through its name prefixed with an underscore
(_os) following the C module naming practice in CPython.
Also right align the macro values to increase readability making it
easier to compare the values for samd21 and samd51. Even the longest
macro from py/mpconfig.h will fit with this alignment.
