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38 lines
1.6 KiB
Plaintext
38 lines
1.6 KiB
Plaintext
Ben Blinkenlights
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=================
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This is an umbrella project for various items related to using the 8:10
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card slot of the Ben Nanonote. The "flagship" sub-project is no longer
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the top-level LED board but the Universal Breakout Board, in ubb/
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. The original blinkenlights, a board with a line of LEDs
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cam/ Outline of the board; obsolete
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ext/ UBB variant with ground between signals; obsolete
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ioscript/ GPIO test pattern generator; experimental
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libubb/ Helper functions for accessing UBB
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lpc111x-isp/ In-system programmer for NXP LPC111x MCUs
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nxuart/ Card with ATmega48 in UART configuration; incomplete
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swuart-chat/ Software-implemented UART (on UBB)
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ubb-jtag/ JTAG via UBB (example for Milkymist One)
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ubb-usb/ Design for hypothetical UBB-based USB host
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ubb-vga/ VGA output using UBB and minimal circuitry
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ubbctl/ Set and query UBB signals from the command line
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ubb/ The Universal Breakout Board (UBB)
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Blinkenlights
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-------------
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This project is a proof of concept implementation of Rikard Lindstrom's
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idea of using the Ben's 8:10 card slot as a general extension interface
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also for devices that don't speak MMC or SD/SDIO. The application is a
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simple LED circuit, as suggested by David Samblas.
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The 8:10 card slot gives access to six GPIOs, a 3.3 V supply that can
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be switched on and off by software, and ground. We use a simple form of
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multiplexing to drive ten LEDs with this interface.
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Note that one should only light one LED at a time. If multiple LEDs are
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lit, they will share the current though the common resistor, and will
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thus be less bright than a single LED.
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