here's a book written mostly the perspective of an os/driver implementer: https://www.fysnet.net/the_universal_serial_bus.htm https://www.fysnet.net/the_univer

here's a book written mostly the perspective of an os/driver implementer: https://www.fysnet.net/the_universal_serial_bus.htm https://www.fysnet.net/the_universal_serial_bus.htm it's also part of a series on building an os.