nanogui: touchscreen calibration
Subject:
Touchscreen calibration
From:
Mark Mussetter ####@####.####
Date:
8 Mar 2004 18:32:06 -0000
Message-Id: <5.1.0.14.0.20040308104711.01ea82a8@link-comm.com>
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.
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?
Thanks for any help you could give,
Mark
Our system:
Motorola 5272
RTEMS 4.6.0pre5
FLTK1.1.4
nxlib0.44
Microwindows-0.90
