added #define USE_THERM_AUTOCALIBRATE to opt out

Moved factory reset thermal auto-calibration behind a new default-on
config #define USE_THERM_AUTOCALIBRATE.  Commenting this out or the
usual #ifdef/#undef in a cfg-[...].h build file allows for manually
calibrating the temperature offset.

This may be useful for factory-calibrated temperature sensors or for
those who regularly flash custom builds and don't want to recalibrate
each time.

Determining the correct temperature offset for a given flashlight
first requires flashing a build with auto-calibrate disabled, using
that to determine the offset, which can then be baked in to future
firmware builds.

2 files changed, 14 insertions, 2 deletions

diff --git a/spaghetti-monster/anduril/config-default.h b/spaghetti-monster/anduril/config-default.h
index 31fcbf4..a50be5d 100644
--- a/spaghetti-monster/anduril/config-default.h
+++ b/spaghetti-monster/anduril/config-default.h
@@ -37,7 +37,19 @@
 // overheat protection
 #define USE_THERMAL_REGULATION
 #define DEFAULT_THERM_CEIL 45  // try not to get hotter than this (in C)
-
+// Comment out to disable automatic calibration on factory reset
+//   - If so, be sure to set THERM_CAL_OFFSET to the correct calibration offset
+//   - Calibration can still be overridden in temperature check mode
+// Or uncomment to use the default auto-calibrate on factory reset
+//
+// To determine THERM_CAL_OFFSET, comment out USE_THERM_AUTOCALIBRATE to
+// disable auto-calibration, compile and flash, let flashlight rest at a known
+// temperature, then enter temp check mode (do NOT enter calibration mode).
+//
+// THERM_CAL_OFFSET = known_temperature - temp_check_blinks + THERM_CAL_OFFSET
+//
+// (include THERM_CAL_OFFSET in sum as it might already be a non-zero number)
+#define USE_THERM_AUTOCALIBRATE
 
 // Include a simplified UI for non-enthusiasts?
 #define USE_SIMPLE_UI
diff --git a/spaghetti-monster/anduril/factory-reset.c b/spaghetti-monster/anduril/factory-reset.c
index c327e65..5377b09 100644
--- a/spaghetti-monster/anduril/factory-reset.c
+++ b/spaghetti-monster/anduril/factory-reset.c
@@ -43,7 +43,7 @@ void factory_reset() {
     }
     // explode, if button pressed long enough
     if (reset) {
-        #ifdef USE_THERMAL_REGULATION
+        #if defined(USE_THERMAL_REGULATION) && defined(USE_THERM_AUTOCALIBRATE)
         // auto-calibrate temperature...  assume current temperature is 21 C
         thermal_config_save(1, 21);
         #endif