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@@ -64,3 +64,10 @@ Without reset circuit you will have inconsistent reuslt due to improper initiali
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- http://geekhack.org/index.php?topic=50176.msg1127447#msg1127447
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- http://www.mikrocontroller.net/attachment/52583/tpm754.pdf
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+
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+
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+## Can't read comlumn of matrix beyond 16
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+Use `1UL<<16` intead of `1<<16` in `read_cols()` in **matrix.h** when your columns goes beyond 16.
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+In C `1` means one of int type which is 16bit in case of AVR so you can't shift left more than 15. You will get unexpected `0` when you say `1<<16`.
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+
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+http://deskthority.net/workshop-f7/rebuilding-and-redesigning-a-classic-thinkpad-keyboard-t6181-60.html#p146279
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tmk