During execution of `boot.py` the USB device is not yet initialized. Any
attempt to write to the CDC (eg calling `print()`) would lock up the
device. This commit skips writing when the USB device is not initialized.
Any output from `boot.py` is lost, but the device does not lock up.
Also removed unnecessary declaration of `tusb_init()`.
Signed-off-by: robert-hh <robert@hammelrath.com>
This new machine-module driver provides a "USBDevice" singleton object and
a shim TinyUSB "runtime" driver that delegates the descriptors and all of
the TinyUSB callbacks to Python functions. This allows writing arbitrary
USB devices in pure Python. It's also possible to have a base built-in
USB device implemented in C (eg CDC, or CDC+MSC) and a Python USB device
added on top of that.
This work was funded through GitHub Sponsors.
Signed-off-by: Angus Gratton <angus@redyak.com.au>
For mimxrt, nrf, renesas-ra, rp2 and samd ports, this commit implements
similar behaviour to the stm32 port, where USB is only brought up after
boot.py completes execution.
Currently this doesn't add any useful functionality (and may break
workflows that depend on USB-CDC being live in boot.py), however it's a
precondition for more usable workflows with USB devices defined in
Python (allows setting up USB interfaces in boot.py before the device
enumerates for the first time).
This work was funded through GitHub Sponsors.
Signed-off-by: Angus Gratton <angus@redyak.com.au>
Change the rp2 and renesas-ra ports to use the helper function.
Saves copy-pasta, at the small cost of one more function call in the
firmware (if not using LTO).
This work was funded through GitHub Sponsors.
Signed-off-by: Angus Gratton <angus@redyak.com.au>
dcd_event_handler() is called from the IRQ when a new DCD event is queued
for processing by the TinyUSB thread mode task. This lets us queue the
handler to run immediately when MicroPython resumes.
Currently this relies on a linker --wrap hack to work, but a PR has been
submitted to TinyUSB to allow the function to be called inline from
dcd_event_handler() itself.
This work was funded through GitHub Sponsors.
Signed-off-by: Angus Gratton <angus@redyak.com.au>
App the mp_ prefix to usbd_ symbols and files which are defined here and
not in TinyUSB.
rp2 only for now. This includes some groundwork for dynamic USB devices
(defined in Python).
This work was funded through GitHub Sponsors.
Signed-off-by: Angus Gratton <angus@redyak.com.au>
