Datasheet

AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
DS41393B-page 46 Preliminary  2009-2012 Microchip Technology Inc.
11. Software must display the third calibration point
target in the lower right quadrant of the display
and prompt the user to touch and release the
target.
FIGURE 10-3: SUGGESTED TEXT FOR
THIRD CALIBRATION
TARGET
12. Wait for the user to touch and release the third
calibration point target. Do this by looking for a
controller response of:
<0x55><0x02><0x00><0x14>
13. Software must display the fourth calibration
point target in the lower left quadrant of the
display and prompt the user to touch and
release the target.
FIGURE 10-4: SUGGESTED TEXT FOR
FOURTH CALIBRATION
TARGET
14. Wait for the user to touch and release the fourth
calibration point target. Do this by looking for a
controller response of:
<0x55><0x02><0x00><0x14>
15. Wait for the controller to correctly write
calibration data into EEPROM
• AR1010/AR1020: Wait one second for data to
be stored into EEPROM
• AR1011/AR1021: Wait for a controller
response of <0x55><0x02><0x00><0x14>
16. Enable touch reporting by issuing
ENABLE_TOUCH command.
Send: <0x55><0x01><0x12>
Receive: <0x55><0x02><Response><0x12>
Touch and
Release Target
Touch and
Release Target