LOGi-Pi and LOGi-Bone are expansion boards featuring Xilinx Spartan 6 for respectively the Raspberry Pi, and the Beaglebone Black. Valent F(x), the company who designed the boards, is currently looking for funds via Kickstarter in order to bring the cost down to $89, or even $69 for early backers.
LOGi boards specifications:
- FPGA – Xilinx Spartan 6 LX9 TQFP-144 FPGA 9,152 Logic Cells, 16 DSP48A1 Slices, 576KB Ram, and 96 User Available I/O Pins
- System Memory – 256 Mb SDRAM connected to the FPGA
- Storage – 1x High Bandwidth SATA connector expansion port
- Video Output – 10x Length-tuned LVDS Pairs
- Connectors:
- 2x Digilent Inc. PMOD ports supporting 59+ plug-and-play hardware modules
- Arduino compatible headers connected to the FPGA pins (3.3v only) supporting over 200 Arduino Shields.
- Bit-Stream loading interface connected to the host processor, optional bitstream FPGA self-loading from onboard Flash.
- Misc – 2x LEDs 2x Push Buttons 2x DIP Switches
- 3.3v I/O Regulator and 1.2v Core
- Optimized 4 Layer Optimized Design to Support Maximum Performance of High Bandwidth Applications Length-tuned GPMC, SDRAM, LVDS Signals
- Beaglebone Black specific features:
- Optional GPMC, SPI or I2C port access from the Beaglebone Black
- Raspberry Pi specific features:
- Connection to the SPI Interface of the Raspberry Pi (3.8 MBps maximum Bandwidth)
- Connection to 16 I/O of the Raspberry Pi expansion port (including SPI, UART, I2C and GCLK and GPIO).
The boards can also be used in standalone configuration via the JTAG header, and a JTAG programmer.
LOGi-Pi interfaces to Broadcom BCM2835 SoC via SPI, and LOGi-Bone uses the GPMC interface of the Sitara processor in the Beaglebone Black, so if you need high throughput, Beaglebone Black combines with LOGi-Bone appears to be a much better option.
Several software and firmware components are available for the boards including:
- LOGi-Loader to load a bit-stream from the host development board with a single command: logi_loader file.bit. It’s also possible to automatically load a given bitstream from the host during system startup, and the user can configure the FPGA to self-configure from onboard flash each time the FPGA is powered on.
- LOGi-Driver – Host <-> FPGA communication driver. SPI driver for Raspberry Pi, and GPMC driver for the Beaglebone Black.
- LOGi-Library is a C-library communication abstraction layer to enable the host development board and the FPGA to readily communicate with one another. For the Raspberry Pi, the library is a Python wrapper.
- LOGi-Hard – Open source IP that implements a wishbone master from the host processor, a set of wishbone peripherals (wishbone-registers, wishbone-memory, wishbone-fifo …) and a set of interface peripherals (servo-controller, pwm-controller, ad-controller, pid-controller …). More IP cores can be downloaded directly from opencores.org.
- LOGi-Demo – A a few demos that are based on the LOGI-Hard library and custom software components:
- Blink led demo – Just blink a led on the FPGA board
- Machine vision demo (using Jonathan Piat’s hard-cv library) – Run a Sobel filter, Gaussian filter, Harris corner detector on the LOGi-Cam and view the results in your web-browser with a custom mjpg-streamer plugin.
- Bitcoin-mining demo (using open source bitcoin miner) – Earn money while sitting on your couch.
- Autonomous Vehicle Control demo – This demo provide all the material to start designing your own Autonomous Ground Vehicle (AGV). The architecture controls the servo, runs a PID controller, and detect colors using the LOGi-Cam. A software stack written in Python handles inputs from GPS and an inertial measurement unit (IMU) to guide your AGV through a series waypoints.
The software, HDL, demos, and hardware files are available in their github repo. The LOGi-Cam mentioned above is another add-on board with the OV7670 sensor to add a camera to the LOGi boards.
The project had a low target of $6,900, and they’ve already raised over $12,000, so the project will go ahead. If you are interested you can pledge $89 for the LOGi-Pi or LOGi-Bone, adding the LOGi-Cam will cost a total of $115. If you have a Raspberry Pi and a Beaglebone, you can get a bundle LOGi-Pi + LOGi-Bone for $135. Shipping is $10 outside the US, and delivery is expected in April 2014.
You can also find getting started guides, and Raspbian and Ubuntu images, and more technical details on Valent F(X) Wiki.
Jean-Luc started CNX Software in 2010 as a part-time endeavor, before quitting his job as a software engineering manager, and starting to write daily news, and reviews full time later in 2011.
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I’ve asked some details about the throughput between the host and the FPGA board: * Raspberry Pi: “Max theoretical bandwidth for the logi-pi is 3.8MB/s using our protocol over SPI to address the wishbone bus,(16 bit overhead for each transfer). In Practice we got ~3MB/s in user space.” * BeagleBone Black: “We have a theoretical bandwidth of 76MB/s and measured up to 69MB/s in user space for transfer of 128KB blocks. Our kernel driver gives access to the whole address space of the FPGA with EDMA but can be re-written to be application specific and get better bandwidth. For now… Read more »