Specifications

Chapter 2 Communicating with the MT410 Controller 31
Note: The example in this discussion is in video terms, with the
origin (0, 0) in the upper left corner of the screen. Examples from the
controller’s perspective, however, place the origin at the lower left corner
of the screen.
Guidelines for Calibrate Extended
Here are several guidelines for using the Calibrate Extended command:
• The controller uses the data immediately before liftoff to register a
calibration touch. Therefore, users can touch the screen, move their
finger to the target, hold for one second, and then lift off their finger.
Instructing users to touch this way results in a more accurate
calibration.
• The controller stores the data in non–volatile memory (NoVRAM).
Therefore, you do not have to calibrate the screen each time you power
on the system. You should, however, recalibrate the touchscreen any
time the video display changes or gets repositioned.
• You can cancel a calibration at any time by issuing a Reset command.
Upper Right Calibration Target
X = 1023 – (1024 x 1/8) = 1023 – 128 = 895
Y = 0 + (768 x 1/8) = 0 + 96 = 96
(0, 0)
(0, 767)
(
1023, 0)
(80, 60)
(560, 420)
Lower Left Calibration Target
X = 0 + (1024 x 1/8) = 0 + 128 = 128
Y = 767 - (768 x 1/8) = 767 - 96 = 671
(128, 671)
(895, 96)