Internal flash used for the filesystem is now written (from the cache)
only after a 5s delay, or when a file is closed, or when the drive is
unmounted from the host. This delay means that multiple writes can
accumulate in the cache, and leads to less writes to the flash, making
it last longer.
It's implemented by a high-priority interrupt that takes care of flash
erase and write, and flushing the cache.
This is still only an interim solution for the flash filesystem. It
eventually needs to be replaced with something that uses less RAM for
the cache, something that can use more of the flash, and something that
does proper wear levelling.
Need to wait for the low-level USB driver to send the data over the USB
in-endpoint before the buffer can be used again. This patch adds a
check for this.
Using Python's file open in 'r' mode opens it for text reading, which
converts all new lines to \n. Could use 'rb' binary mode, but then
don't have access to the string Template replacement functions. Thus,
force the output to have '\\r\\n' ending.
Also fix regex to match hex digits.
The USB VID&PID are automatically extracted from usbd_desc_cdc_msc.c
and inserted into pybcdc_inf.template, ensuring that the same USB
IDs get used everywhere
Paul Sokolovsky
Damien George
Andrew Scheller
Dave Hylands