Closes #210

Signed-off-by: Rahix <rahix@rahix.de>

Signed-off-by: Rahix <rahix@rahix.de>

Create weak links from MicroPython specific implementations of
modules to standard names. I.e. allow `import time` to import
utime module.

It's 44 years since the release of vi and sadly lots of editors still
don't care about trimming off trailing spaces ...
Signed-off-by: Rahix <rahix@rahix.de>

This allows to read and write strings to the config file.

Instead of an ugly hack where spaces are used to pad the entries
background colors, properly draw a rectangle and the text above
it.  No visual change.
Signed-off-by: Rahix <rahix@rahix.de>

Signed-off-by: Rahix <rahix@rahix.de>

Fix all warnings in pycardium/modules.
Signed-off-by: Rahix <rahix@rahix.de>

As discussed in card10/firmware!357

, we should increase the number of
enabled compiler warnings to catch a lot more silent bugs.  Increase the
meson-global warning level to 2, but excluding the `unused-parameter`
and `old-style-declaration` warnings.  Additionally, disable warnings
for libraries as we cannot fix that code anyway.
Signed-off-by: Rahix <rahix@rahix.de>

Implement the hal functions necessary for utime.ticks_ms() and
utime.ticks_us().  This enables much more accurate measurements of time
taken in Pycardium (useful for profiling).

Please note that the tick counter will reset whenever a new app is
loaded.
Signed-off-by: Rahix <rahix@rahix.de>

fgross authored Nov 13, 2019 and Rahix committed Nov 13, 2019

The framebuf module provides a framebuffer implementation running purely
in MicroPython which will increase drawing performance by a lot.  A
follow-up change will be necessary to connect this framebuffer
implementation to the display API.

This commit is implements a part of MR !211.

Rewrite the delay implementation to be more accurate and properly handle
incoming MicroPython interrupts (See issue #177).

For this, the delay is split into two functions:

- systick_delay_precise(): Delay with microsecond accuracy for delays
      less than 1 ms.
- systick_delay_sleep(): Sleep for a potentially very long time, using
      WFI to put the CPU to sleep.  Whenever the CPU wakes up, this
      function will poll the MicroPython scheduler so it can execute
      pending interrupts.

Ontop, this implementation allows for a future, fast, tick-based
monotonic time implementation (e.g. mp_hal_ticks_ms).
Signed-off-by: Rahix <rahix@rahix.de>

Enable the input() builtin which allows reading from the serial console.
Signed-off-by: Rahix <rahix@rahix.de>

Allow calling buttons.read() without an argument.  This is equivalent to
a mask with all bits set (that is, buttons.read(255)).  Additionally,
add a check that the mask is within the limits (< 256).
Signed-off-by: Rahix <rahix@rahix.de>

For convenience, allow calling os.listdir() without any argument.
This is equivalent to calling os.listdir("").
Signed-off-by: Rahix <rahix@rahix.de>