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Apparently it's one of these:


GPIO 5 goes 1 from 1 to 0 a lot when screen is touched and stylus moved around.

the code from the TI appnote slaa169 is mis-matched with the appnote tsc2200. pay special attention to the TwoWordThingyRead function, if you don't do EXACTLY what it does, you cannot possibly hope to get a valid response from the tsc2200.

the tsc2200 also deals with keys and battery monitoring.

Additional information: