AR1011-ISLASHML datasheet(33/61 Pages) MICROCHIP

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DS40001393C-page 33

AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER

9.3.2

ENABLE_TOUCH

– 0x12

Controller will send touch coordinate reports for valid

touch conditions.

Send:

<0x55><0x01><0x12>

Receive: <0x55><0x02><Response><0x12>

9.3.3

DISABLE_TOUCH

– 0x13

Controller will not send any touch coordinate reports. A

touch will, however, still wake-up the controller if

asleep.

Send:

<0x55><0x01><0x13>

Receive: <0x55><0x02><Response><0x13>

9.3.4

CALIBRATE

– 0x14

Enter Calibration mode. This instructs the controller to

enter a mode of accepting the next four touches as the

calibration point coordinates. See Section 10.1 “Cali-

bration of Touch Sensor with Controller”

for an

example.

Completion of Calibration mode will automatically store

the calibration point coordinates in on-board controller

memory and set (to 1) the CCE bit of the TouchOptions

coordinates that have been processed with the

previously collected calibration data.

To provide for proper touch orientation, the four

sequential calibration touches must be input in the

physical order on the touch sensor, as shown in

Figure 9-1.

FIGURE 9-1:

CALIBRATION ROUTINE

SEQUENCE

Upon completion, the controller’s register values and

calibration data are stored to the EEPROM.

The Calibration mode will be canceled by sending any

command before the mode has been completed. If the

calibration is canceled, the controller response may

appear incorrect or incomplete. This is expected

behavior.

Touch Sensor

Upper Left

Upper Right

Lower Right

Lower Left

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