1580_limit to the number of times

[EUU]

Is there a limit to the number of times of TP calibrations for this sample 1580?

[mikeysklar]

My guess is yes there is a limit to how many times you can run the TP calibrations with the AR1100 touch screen controller.

The issue is the EEPROM is writing the new values in during calibration and EEPROMs generally are limited to 100k writes. Hopefully that is high enough value you would not need to be concerned about frequenty recalibrations.

Code: Select all

7.2.3 EXECUTION
The host first commands the AR1100 to enter Calibration mode, then subsequently presents the calibration point targets, one at a time, from left to right, top to bottom. The AR1100 returns a calibration command response packet each time the operator touches a target – signaling the host to proceed. Upon completion, the data from the calibration process is saved to EEPROM and available for use by the AR1100 during normal operation. Calibration process can be aborted by the host by simply issuing any command. That command will be ignored but the response to that command will have a status byte that indicates that calibration had terminated prematurely (see below).

http://ww1.microchip.com/downloads/en/d ... 41606b.pdf