mirror of https://github.com/raphnet/4nes4snes
88 lines
3.8 KiB
Plaintext
88 lines
3.8 KiB
Plaintext
This is the Readme file to Objective Development's firmware-only USB driver
|
|
for Atmel AVR microcontrollers. For more information please visit
|
|
http://www.obdev.at/avrusb/
|
|
|
|
This directory contains the USB firmware only. Copy it as-is to your own
|
|
project and add your own version of "usbconfig.h".
|
|
|
|
|
|
TECHNICAL DOCUMENTATION
|
|
=======================
|
|
The technical documentation for the firmware driver is contained in the file
|
|
"usbdrv.h". Please read all of it carefully!
|
|
|
|
|
|
USB IDENTIFIERS
|
|
===============
|
|
Every USB device needs a vendor- and a product-identifier (VID and PID). VIDs
|
|
are obtained from usb.org for a price of 1,500 USD. Once you have a VID, you
|
|
can assign PIDs at will.
|
|
|
|
Since an entry level cost of 1,500 USD is too high for most small companies
|
|
and hobbyists, we provide a single VID/PID pair for free. If you want to use
|
|
your own VID and PID instead of our's, define the macros "USB_CFG_VENDOR_ID"
|
|
and "USB_CFG_DEVICE_ID" accordingly in "usbconfig.h".
|
|
|
|
To use our predefined VID/PID pair, you MUST conform to a couple of
|
|
requirements. See the file "USBID-License.txt" for details.
|
|
|
|
|
|
HOST DRIVER
|
|
===========
|
|
You have received this driver together with an example device implementation
|
|
and an example host driver. The host driver is based on libusb and compiles
|
|
on various Unix flavors (Linux, BSD, Mac OS X). It also compiles natively on
|
|
Windows using MinGW (see www.mingw.org) and libusb-win32 (see
|
|
libusb-win32.sourceforge.net). The "Automator" project contains a native
|
|
Windows host driver (not based on libusb) for Human Interface Devices.
|
|
|
|
|
|
DEVELOPMENT SYSTEM
|
|
==================
|
|
This driver has been developed and optimized for the GNU compiler version 3
|
|
(gcc 3). It does work well with gcc 4 and future versions will probably be
|
|
optimized for gcc 4. We recommend that you use the GNU compiler suite because
|
|
it is freely available. AVR-USB has also been ported to the IAR compiler and
|
|
assembler. It has been tested with IAR 4.10B/W32 and 4.12A/W32 on an ATmega8
|
|
with the "small" memory model. The "tiny" memory is not supported. Please
|
|
note that gcc is more efficient for usbdrv.c because this module has been
|
|
deliberately optimized for gcc.
|
|
|
|
|
|
USING AVR-USB FOR FREE
|
|
======================
|
|
The AVR firmware driver is published under an Open Source compliant license.
|
|
See the file "License.txt" for details. Since it is not obvious for many
|
|
people how this license applies to their own projects, here's a short guide:
|
|
|
|
(1) The USB driver and all your modifications to the driver itself are owned
|
|
by Objective Development. You must give us a worldwide, perpetual,
|
|
irrevocable royalty free license for your modifications.
|
|
|
|
(2) Since you own the code you have written (except where you modify our
|
|
driver), you can (at least in principle) determine the license for it freely.
|
|
However, to "pay" for the USB driver code you link against, we demand that
|
|
you choose an Open Source compliant license (compatible with our license) for
|
|
your source code and the hardware circuit diagrams. Simply attach your
|
|
license of choice to your parts of the project and leave our "License.txt" in
|
|
the "usbdrv" subdirectory.
|
|
|
|
(3) We also demand that you publish your work on the Internet and drop us a
|
|
note with the URL. The publication must meet certain formal criteria (files
|
|
distributed, file formats etc.). See the file "License.txt" for details.
|
|
|
|
Other than that, you are allowed to manufacture any number of units and sell
|
|
them for any price. If you like our driver, we also encourage you to make a
|
|
donation on our web site.
|
|
|
|
|
|
COMMERCIAL LICENSES FOR AVR-USB
|
|
===============================
|
|
If you don't want to publish your source code and the circuit diagrams under
|
|
an Open Source license, you can simply pay money for AVR-USB. As an
|
|
additional benefit you get USB PIDs for free, licensed exclusively to you.
|
|
See http://www.obdev.at/products/avrusb/license.html for details.
|
|
|
|
|
|
|