Tedium x8

$ cd tedium
# Grant access through `udev` to the FTDI JTAG interface on the Tedium board.
$ sudo ln -sf ./99-tedium.rules /etc/udev/rules.d/
$ sudo udevadm control --reload-rules && sudo udevadm trigger
#
$ pip3 install poetry --user
# Might need to log out and in to get ~/.local/bin in PATH.
# Or, `source ~/.profile`.
# Set up virtual environment, download and install dependencies
$ poetry install
# Enter poetry shell
$ poetry shell
# Include OSS CAD Suite tools in PATH
$ export PATH="/home/jboone/src/fpga/oss-cad-suite/bin:$PATH"
# Build and download FPGA bitstream
# LUNA_AVOID_BLOCKRAM required for reliable USB enumeration as of 2022/May/02.
$ LUNA_AVOID_BLOCKRAM=1 applets/tedium-fpga
# After the bitstream is generated, you can inspect the results in the `build` directory.
# Initialize the framer/LIU
$ cargo run --release --bin tedium-tool -- init
# Run the host-side audio and event engine
$ cargo run --release --bin tedium-tool -- monitor

$ python3 -m unittest tests.hdl.tx_usb_to_fifo
# Or the name of any other HDL test module you want to run/simulate.

$ sudo cat /sys/kernel/debug/usb/devices
$ sudo cat /sys/kernel/debug/dynamic_debug/control | grep "snd_usb_audio"
$ sudo echo 'file sound/usb/* +p' >/sys/kernel/debug/dynamic_debug/control
$ sudo sysctl -w kernel.printk=7 # debug-level messages
$ sudo sysctl kernel.printk

$ sudo modprobe usbmon
$ sudo wireshark
# Capture stuff

# Find USB IN on endpoint 1, where the frame of completed inbound URBs is not the typical length.
# This helps find where the async audio input FIFO level is wrapping around.
usb.endpoint_address.number==1 && usb.endpoint_address.direction==IN && usb.urb_type=='C' && frame.len != 1728
# Set the time reference at an interesting record in Wireshark, disable view filtering, and work from there.
# Note that "marked" records appear regardless of whether they match the view filter, which is very handy.
# Now match on USB OUT records that have been submitted (pending transmission)
usb.endpoint_address.number==1 && usb.endpoint_address.direction==OUT && usb.urb_type=='S'

# Is there an `rtkit` user?
$ getent passwd rtkit
# Is there an `rtkit*` user?
$ ps ax | grep -i rtkit
# Check that RTKit is actually changing our process/thread priority:
$ journalctl -e -t rtkit-daemon
# `ulimit` values:
$ ulimit -a