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I2C interface for 4x4 keyboard with partial support for 2-key rollover and autorepeat. Based on a Texas Instruments MSP430G2553 processor, uses a GPIO pin for signalling keypress events to host. Example PCB is a KiCad project for the 20-pin DIP version MSP430G2553. https://github.com/terjeio/I2C-interface-for-4x4-keyboard I am using this to test jogging in my GRBL-port embedded in the CO2-laser controller firmware (for Tiva C) I am working on. I have left some code (#defined out) to show how 2-key rollover and autorepeat can be enabled for some keys. The hardware abstracted ARM GRBL-port and an example driver for the Tiva C LauncPad is also available on GitHub.