S3C2440 platform under the Windows CE matrix keyboard driver. 4 × 3 keypad support an entire column, it is easily extended into a whole other column. And tested to support CE5 and CE6 platform.

MatrixButton\makefile
............\mtxbtn2440.c
............\mtxbtn2440.def
............\mtxbtn2440.h
............\sources
............\obj\ARMV4I\retail\mtxbtn2440.def
............\...\......\......\mtxbtn2440.obj
............\...\......\......\_objects.mac
............\...\......\retail
............\...\ARMV4I
............\obj
MatrixButton

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