nanogui: Setting up TouchScreen for AT91SAM9261-EK
Subject:
Re: [nanogui] Setting up TouchScreen for AT91SAM9261-EK
From:
"Kelvin Xu" ####@####.####
Date:
25 Jan 2007 13:51:23 +0000
Message-Id: <BAY117-F236CE7FD294965753A777CBFA30@phx.gbl>
Hi,
Think i have figure it out by a bit.
Each event is 8 Bytes. One each for pen-down and pen-up. The X and Y
coordinates of pen-down and up remain to be that of pen-down even when the
pen is drag to another position before lifting it up.
However, i am not too sure how Nano-X input drivers work.
There are 2 possible values for the pressure variable after analysing my
touchscreen output.
1) One of the byte shows a value of 7500 on pen-down and 0 on pen-up. =>
This subsequent pen-down and pen-up event does not send a "Click" event to
Nano-X as the programs do not respond
2) The other shows an almost random values on pen-up and pen-down varying
from 100-9000 and i could not figure out a pattern. With this, Nano-X
interpret as a continous pen-down.
Could you advice on what could be a possible problem?
Regards,
Kelvin
>From: "Uwe Klatt" ####@####.####
>To: "Kelvin Xu" ####@####.####
>Subject: Re: [nanogui] Setting up TouchScreen for AT91SAM9261-EK
>Date: Thu, 25 Jan 2007 14:07:22 +0100
>
>Hello,
>
>>The
>>strange thing i encountered is although using the command: "cat
>>/dev/ts0 > output" returns 16 bytes for each event.
>>I encountered the following error:
>>Wrong number of bytes 8 read from touch panel (expected 16)
>>Below is a series of output from 4 events on roughly the same point:
>>4C 1D 9A 00 97 00 CB 00 00 00 9A 00 97 00 B8 0B
>>4C 1D 9B 00 99 00 F3 23 00 00 9B 00 99 00 14 05
>>4C 1D 9B 00 99 00 A7 1F 00 00 9B 00 99 00 E4 25
>>4C 1D 9C 00 9B 00 03 19 00 00 9C 00 9B 00 34 21
>>My guess is
>>struct ts_event {
>> short dummy
>> short x;
>> short y;
>> short pressure;
>>};
>
>If you get 16 Bytes you need a ts_event structure with 16 Bytes ;-)
>
>e.g.
>
>struct ts_event {
>short dummy
>short x;
>short y;
>short pressure;
>short dummy2;
>short dummy3;
>short dummy4;
>short dummy5;
>};
>
>Youl have to find out the data format of your touch controller...
>
>Bye
>Uwe
>
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