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Diffstat (limited to 'README.md')
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@@ -7,16 +7,18 @@ A small CPU and a computer built around it. Currently, the planned hardware is based around an [iCEBreaker] and an [Inkplate 6]. The [original Inkplate 6 case]'s top is used (since the Inkplate came glued to it), but the bottom is replaced by a 3D-printed custom case that leaves room for the remainder of the components and ports on the bottom. The Inkplate provides power via a lithium battery, and access to its display, its microSD card, and its Wi-Fi and Bluetooth connectivity. -The iCEBreaker is connected to the Inkplate over both I²C and UART. +The iCEBreaker is connected to the Inkplate over UART. The iCEBreaker is augmented with a [quad HyperRAM PMOD] module, which it uses for main memory. A [CH559] is used to provide support for USB keyboards. It connects to the iCEBreaker over UART, essentially acting as a PS/2 keyboard would. +Finally, a variety of devices connect to the iCEBreaker over I²C, including several [MCP23017] [iCEBreaker]: https://docs.icebreaker-fpga.org/ [Inkplate 6]: https://soldered.com/product/soldered-inkplate-6-6-e-paper-board/ [original Inkplate 6 case]: https://github.com/SolderedElectronics/Inkplate-6-hardware/blob/master/3D%20printable%20case/Original%20case [quad HyperRAM PMOD]: https://1bitsquared.com/products/pmod-hyperram [CH559]: https://www.wch-ic.com/products/CH559.html +[MCP23017]: https://www.microchip.com/en-us/product/mcp23017 The different components are in the following subdirectories: @@ -28,3 +30,8 @@ The different components are in the following subdirectories: [Bluespec]: https://github.com/B-Lang-org/bsc [OpenSCAD]: https://openscad.org/ + +## Inkplate + +The Inkplate 6 provides 800x600 pixels with 3 bits of greyscale color depth. +It quotes a 1.26s update time; in order to update at faster than the refresh rate, we need to run the UART at 2MHz, which gives a 900ms access time to send the whole framebuffer, or 1.2s if we send 4 bits per pixel. |