mirror of
git://projects.qi-hardware.com/ben-blinkenlights.git
synced 2025-02-25 14:47:56 +02:00
debe9cc351
- physmem.c (align_sbrk): align the end of the data segment - physmem.c (calloc_phys_vec): align the line pointer vector to a machine word, just in case - physmem.c (calloc_phys_vec): crudely align the line buffers within pages, to avoid page-crossing within a line (yes, this does reduce noise)
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.