Touch screen calibration can get stuck in loop

[caternuson]

Several people running in to this. First post seems to point to location of issue.

https://forums.adafruit.com/viewtopic.php?f=57&t=179488
https://forums.adafruit.com/viewtopic.php?f=8&t=183445
https://forums.adafruit.com/viewtopic.php?f=57&t=182318
https://forums.adafruit.com/viewtopic.php?f=57&t=183982&p=893736#p893735

[caternuson]

I can't recreate this. I ran into some new compile time issues (see #3) which I just fixed locally to get things to compile and load.

The calibration happens at the start, and happens with any restart or reset, but it does not get stuck in a loop.

Using Feather ESP8266 + 2.4" TFT FeatherWing and just following guide:
https://learn.adafruit.com/wifi-weather-station-with-tft-display/software

[ladyada]

fixed re-calibration on every boot in latest PR