mirror of
git://projects.qi-hardware.com/ben-blinkenlights.git
synced 2024-11-23 21:08:07 +02:00
Blinkenlights, Demonstrate the use of the uSD slot for DIY hardware
http://projects.qi-hardware.com/index.php/p/ben-blinkenlights/
a8a0cfa22f
Note that DMA is very sensitive to the video timing. At the moment, only 800x600 mode works without locking up the DMA controller. - ubb-vga.c (DMA, setup_noirq, cleanup_noirq, line): replaced MMC PIO with DMA - ubb-vga.c (frame): pass physical addresses to "line" - ubb-vga.c (frame): detect if the DMA controller is stuck |
||
|---|---|---|
| avrdude | ||
| bbl | ||
| cam | ||
| components | ||
| ext | ||
| nxuart | ||
| ubb | ||
| ubb-vga | ||
| bbl.brd | ||
| bbl.cmp | ||
| bbl.pro | ||
| bbl.sch | ||
| BOOKSHELF | ||
| Makefile | ||
| README | ||
Ben Blinkenlights ================= This project is a proof of concept implementation of Rikard Lindstrom's idea of using the Ben's 8:10 card slot as a general extension interface also for devices that don't speak MMC or SD/SDIO. The application is a simple LED circuit, as suggested by David Samblas. The 8:10 card slot gives access to six GPIOs, a 3.3 V supply that can be switched on and off by software, and ground. We use a simple form of multiplexing to drive ten LEDs with this interface. Note that one should only light one LED at a time. If multiple LEDs are lit, they will share the current though the common resistor, and will thus be less bright than a single LED.