Add all python code run on the device to the manifest.py to freeze
it. This has two benefits:
- It precompiles the bytecode, so it is smaller and faster
- All code (C and python) is now in the firmware image, leaving the
littlefs filesystem on the flash free for user settings.
This requires changing the way the hardware variants are handled. There
is now only one _filesystem_ image, but instead there are different
_firmware_ images for each variant.
Signed-off-by: Matthias Blankertz <matthias@blankertz.org>
In order to turn the Tonberry device on more reliably even if the power
button is only pressed for a short time, move the setting of POWER_EN
pin to high from the python board_init to the MICROPY_BOARD_STARTUP
macro so that is is started in the C startup code run before the
micropython interpreter is initialized.
Measured time from power on to POWER_EN time was 600-800 ms with the
python board_init, vs. 155 ms for the MICROPY_BOARD_STARTUP.
Signed-off-by: Matthias Blankertz <matthias@blankertz.org>
The python and C modules that are supposed to be built into the firmware
image (i.e. those that are in manifest.py or in USER_C_MODULES) have
been moved to the software/modules directory.
The software/src directory should now only contain python scripts and
other files that should be installed to the Picos flash filesystem. The
idea is that these should be those scripts that implement the
application behaviour, as these are the ones that a user who does not
want to build the whole firmware themself wants to modify.
Rename the exising audiocore C module to _audiocore and create a new
Micropython wrapper module audiocore. This makes it easier to implement
async methods.
Add interrupt support to _audiocore that notifies core0 whenever data
has been consumed from the MP3 bitstream buffer.
Use this interrupt and an asyncio.ThreadSafeFlag to implement
audiocore.async_put which will play back the provided buffer, allowing
other async tasks to run while waiting for space in the bitstream
buffer.
The builtin micropython SD card driver using the default micropython SPI
implementation suffered from very low read speeds. Add an optimized SD
card driver using rp2 PIO and DMA. Currently read only, write support to
be added later.
Signed-off-by: Matthias Blankertz <matthias@blankertz.org>
