When he tested the HDMI with his monitor, it was out of spec but still worked. His TV, on the other hand, refused to play it at all. This was due to the Neo Geo outputting 59.1 fps – not the standard 60 fps. Using the FPGA, [Charlie] overclocked the NeoGeo by approximately 1% and used the 27Mhz pixel clock to change the FPGA output to a 720 x 480p signal.
Good news everyone the Papilio DUO and the Papilio Shields are expected to arrive in stock early next week and we are now taking pre-orders for the new items in the Gadget Factory Store. We encourage you to pre-order now and reserve your DUO because the numbers will be limited since the big part of the first batch went to Kickstarter backers.
We were just emailed about this cool FPGA/Papilio video so we thought we should share it on the blog. Check it out!
This video will explain why FPGA’s are great to build your projects on!
Here is another great Bil Herd article about Active Filters. Thank you HackaDay!
In this installment I’ll test the theory that filtering out the harmonics which make up a square wave results in a predictable degradation of the waveform until at last it is a sine wave. This sine wave occurs at the fundamental frequency of the original square wave. Here’s the video but stick with me after the break to walk through each concept covered.
LCD panels don’t use a simple protocol like VGA for turning pixels on and off. Instead, the very high-speed LVDS is used. LVDS is beyond the capabilities of simple microprocessors, so [EiNSTeiN_] built himself a clone of an XuLA FPGA prototyping board and set to work. After figuring out the signal lines to the panel, [EiNSTeiN_] pored over the timing diagrams for the LVDS controller and the LCD panel. From the data sheets, he figured out data is usually sent to the panel at about 500 MHz. The homebrew FPGA board couldn’t manage that speed so [EiNSTeiN_] cut the FPGA clock in half.
This project is a soup to nuts demonstration of replacing electronics drivers; the skill is certainly not limited to LCD modules. He starts by disassembling the hardware to find what look like differential signaling lines. With that in mind he hit the Internet looking for common video protocols which will help him figure out what he’s looking for. A four-channel oscilloscope sniffs the signal as the unit shows a blue screen with red words “NO SIGNAL”. That pattern is easy to spot since the pixels are mostly repeated except when red letters need to be displayed. Turns out the protocol is much like VGA with front porch, blanking, etc.
Hamster tipped us off to this nice talk about Software Defined Radio. It’s definitely worth watching…
Papilio One spotted in article about Open Source Hardware!
Developments in open source are not just exciting as viable and marketable options, but as a real boon for innovation. Growing interest along with shared goals to create and better developments in science and technology inspired a team at CERN to create the Open Hardware Repository and Open Hardware License. Additionally, open source hardware groups hope to inspire more people from diverse backgrounds to join the innovation.