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- ubb-vga2.c (line): write the first word to the TX FIFO after starting the command or it is lost - ubb-vga2.c (line): fetch the first word while waiting for the back porch, making sure we have plenty of time for cache effects - ubb-vga2.c (line): we no longer need to prefetch the first word of the next line
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.