nanogui: touchscreen calibration
Subject:
Re: [nanogui] Touchscreen calibration
From:
Mark Mussetter ####@####.####
Date:
9 Mar 2004 21:16:32 -0000
Message-Id: <5.1.0.14.0.20040309133230.00ac88c8@link-comm.com>
Hello Daniel,
I did some more searching in Microwindows and found a nice example called
nxcal.c. This program calculates a transform which is also used in
GdMouseRead to filter jitter. We used nxcal.c as a starting point and came
up with a nice calibration and filter for our touchscreen.
Thanks,
Mark
At 01:03 PM 3/9/2004 +0100, you wrote:
>Hello Mark,
>
>
>Mark Mussetter írta:
>
>>Hello Everyone,
>>
>>We have a 240X320 touchscreen display basically working with FLTK1.1.4
>>and Microwindows-0.90. We calibrated the touchscreen by hand using
>>equations that take into account the ADC ranges of the X-axis and
>>Y-axis. This gets us pretty close on our coordinate calculations,
>>however, we were wondering if there is a standard way of doing
>>touchscreen calibration with Microwindows so we don't have to repeat this
>>procedure for every new screen we install.
>I am working also on calibration problem. I have not find any standard
>routine. That is the case I am going to write one! I have a sample program
>that I can send to you that maybe can partly help.
>
>>Is there a standard calibration routine included in Microwindows and do
>>you feed it raw ADC values?
>>
>>Also, we are getting coordinate readings back that vary by about +/- 10
>>pixels of the actual "pen down" location. Are there any filtering
>>routines out there that filter out that noise and maybe debounce the "pen
>>down" readings?
>
>I found an old microwindows driver at this distribution at the
>src/drivers/old/mou_tp.c. In the "first"PD_Read(...) function you can
>find codes that filter the noises after the conversation process. I
>implemented this one and I got more stable cursor.
>
>Regards,
>Daniel
>
>>
>>Thanks for any help you could give,
>>
>>Mark
>>
>>Our system:
>> Motorola 5272
>> RTEMS 4.6.0pre5
>> FLTK1.1.4
>> nxlib0.44
>> Microwindows-0.90
>>
>>
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