This adds to the ESP8266 tutorial instructions explaining which pins to
pull low to enter programming mode.
Commit made originally by @ARF1 in #2910.
Signed-off-by: Damien George <damien@micropython.org>
This adds an initial specification of the machine.PWM class, to provide a
way to generate PWM output that is portable across the different ports.
Such functionality may already be available in one way or another (eg
through a Timer object), but because configuring PWM via a Timer is very
port-specific, and because it's a common thing to do, it's beneficial to
have a top-level construct for it.
The specification in this commit aims to provide core functionality in a
minimal way. It also somewhat matches most existing ad-hoc implementations
of machine.PWM.
See discussion in #2283 and #4237.
Signed-off-by: Damien George <damien@micropython.org>
This commit adds the errno attribute to exceptions, so code can retrieve
errno codes from an OSError using exc.errno.
The implementation here simply lets `errno` (and the existing `value`)
attributes work on any exception instance (they both alias args[0]). This
is for efficiency and to keep code size down. The pros and cons of this
are:
Pros:
- more compatible with CPython, less difference to document and learn
- OSError().errno will correctly return None, whereas the current way of
doing it via OSError().args[0] will raise an IndexError
- it reduces code size on most bare-metal ports (because they already have
the errno qstr)
- for Python code that uses exc.errno the generated bytecode is 2 bytes
smaller and more efficient to execute (compared with exc.args[0]); so
bytecode loaded to RAM saves 2 bytes RAM for each use of this attribute,
and bytecode that is frozen saves 2 bytes flash/ROM for each use
- it's easier/shorter to type, and saves 2 bytes of space in .py files that
use it (for each use)
Cons:
- increases code size by 4-8 bytes on minimal ports that don't already have
the `errno` qstr
- all exceptions now have .errno and .value attributes (a cpydiff test is
added to address this)
See also #2407.
Signed-off-by: Damien George <damien@micropython.org>
Make and CMake builds are slightly different and these changes help make it
clear what to do in each case.
Signed-off-by: Damien George <damien@micropython.org>
It's a bit of a pitfall with user C modules that including them in the
build does not automatically enable them. This commit changes the docs and
examples for user C modules to encourage writers of user C modules to
enable them unconditionally. This makes things simpler and covers most use
cases.
See discussion in issue #6960, and also #7086.
Signed-off-by: Damien George <damien@micropython.org>
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>
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.
