MicroTouch Micro Touch Capacitive Controller MT3000, Справочное руководство, Страница: 39 / 64

Chapter 2 Communicating with the MT3000 Controller 39
Calibrate Raw
Syntax:
<SOH> CR <CR>
Description:
Allows the collection of raw (signed) X and Y coordinates prior to the
normal scaling, linearization, and filtering processes. The controller sends
the coordinates whenever a touch is detected and continues to send a stream
of data as long as a finger remains in contact with the touchscreen.
The Calibrate Raw data is a 5-byte packet that includes 1 status byte and 4
bytes of binary X/Y coordinate data. Each X/Y coordinate includes 10
binary bits and 1 sign bit. The 10 bits represent coordinates within a range
of -1024 to +1023.
To use the Calibrate Raw command, the controller and host system must be
in an 8-bit data communication mode. The Calibrate Raw command returns
a negative response if the controller is not using an 8-bit communication
mode.
To end Calibrate Raw mode, issue a Reset command.
MicroTouch uses the Calibrate Raw command during manufacturing and
testing, and recommends you use this command for diagnostics when you
want raw data. Use the Calibrate Extended command for standard
interactive, two-point calibration.
Response:
<SOH> 0 <CR> Positive response.
After the controller is in Calibrate Raw mode, touching the screen causes
the controller to return a response in the following format:
SXxYy