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In previous posts, we covered taking apart a DasKeyboard, mapping the keys to their corresponding signals on the internal connector, and getting that information neatly cataloged into a MySQL database. In this part of the series, we’ll be looking at how we’re going to map each key to a unique value, or rather a pair of unique values so we can construct a proper lookup table.
If you recall, we have a table in our database that looks like the following:
The key that is a ‘W’ in the qwerty layout represents a comma character in the dvorak layout. The signal combinations for each are laid out in the qwRow, qwCol, dvRow, and dvCol fields. When this key is pressed, it will connect pins 7 and 19. Our programmable logic is going to instead make it look like lines 1 and 21 are connected, thus fooling the host microcontroller into sending a different key code to the host computer.
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