Thanks to NXP for providing example code for the KPP peripheral on the RT1010. The one thing they missed was a wiring diagram for the example (although doc/readme.txt gives the connections) - so I thought I'd provide what I worked out. With the below connections, it works straight out of the box! Unfortunately, though, only for digits 1-9...
The code uses Rows 1-3 and Columns 1-3, leaving Row 0 and Column 0 unused. Connecting those two for the full 4x4 keypad is left as an exercise for the reader. Hint: you'll need Arduino's A3, and pin 2 of J54 (not shown below, but the pin on the right with that orientation).
The RT1010 EVK has Arduino connectors, so it was easiest to use Fritzing and the ubiquitous 4x4 Arduino membrane keypad to provide a diagram. These correspond to the upper pins on the corresponding EVK connectors with this orientation:
Daniel,
I did indeed mean J54. It's one of the jumpers between the Arduino connectors. In the image below, it's the left of the three in the row, circled in red. In this orientation, it's the top pin.
According to the schematic, that pin is directly connected to GPIO 11 (Pin 1) on the MCU, and is also labelled SPDIF Out. It's not on the Arduino connector - this was the easiest access point.
