This directory contains the FX2 firmware for the HDMI2USB project. It uses the Open Source fx2lib, a free reimplementation of the Cypress support library.
The firmware is responsible for transporting the video data off of the FPGA. It does this by enumerating as a USB Video Class device; a standard way of interfacing devices such as webcams to a host. Linux, Windows and OS X all include support out of the box for reading taking to such devices.
The firmware is also used for control and debugging of the system, through a USB Communications Class Device. This is a common way of attaching serial ports to the system, and under Linux it can be accessed at /dev/ttyUSBX.
The firmware uses the Open Source fx2lib, which will be downloaded as part of the build process.
The build process requires git, make and sdcc. SDCC, the Small Device C Compiler, is packaged in Debian and derivatives such as Ubuntu, as well as Fedora:
sudo apt-get install sdcc
sudo yum install sdcc
make
Use fx2loader from the libfpgalink project:
fx2loader -v 0925:3881 firmware.hex ram
FIXME: Check this is correct!!!
| Endpoint | Direction | Transfer type | Used? | Comments |
|---|---|---|---|---|
| 0 | - | CONTROL | No | USB Reserved |
| 1 | IN | INT | Yes | CDC Polling/Int? |
| 2 | OUT | BULK | Yes | Used for UART TX |
| 4 | IN | BULK | Yes | Used for UART RX |
| 6 | IN | BULK | Yes | Used for sending UVC camera data |
| 8 | - | - | No | Unused, can be freed |
| Endpoint | Direction | Transfer type | Comments |
|---|---|---|---|
| 0 | - | Control | Reserved |
| 1 | IN and OUT | INT/BULK | 64-byte buffers for smaller payloads |
| 2 | IN or OUT | BULK/ISO/INT | 512 or 1024 byte buffers for larger payloads |
| 4 | IN or OUT | BULK/ISO/INT | |
| 6 | IN or OUT | BULK/ISO/INT | |
| 8 | IN or OUT | BULK/ISO/INT |
Create a USB Virtual COM Port: http://janaxelson.com/usb_virtual_com_port.htm
USBCDC1.2 Spec PSTN120.pdf Page