From 5ee5845d4614cb8285cdf0bf529c26bec7ce7217 Mon Sep 17 00:00:00 2001
From: Selene ToyKeeper
Date: Wed, 24 Jan 2018 19:43:00 -0700
Subject: FSM: added ability to adjust temperature calibration in UI
 (lower-case therm_cal_offset var).

---
 spaghetti-monster/fsm-adc.c | 2 +-
 spaghetti-monster/fsm-adc.h | 7 ++++---
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/spaghetti-monster/fsm-adc.c b/spaghetti-monster/fsm-adc.c
index d863b94..c6f5d2a 100644
--- a/spaghetti-monster/fsm-adc.c
+++ b/spaghetti-monster/fsm-adc.c
@@ -150,7 +150,7 @@ ISR(ADC_vect) {
     // temperature
     else if (adc_step == 3) {
         // Convert ADC units to Celsius (ish)
-        int16_t temp = measurement - 275 + THERM_CAL_OFFSET;
+        int16_t temp = measurement - 275 + THERM_CAL_OFFSET + therm_cal_offset;
 
         // prime on first execution
         if (reset_thermal_history) {
diff --git a/spaghetti-monster/fsm-adc.h b/spaghetti-monster/fsm-adc.h
index 5ffbb73..1b16d01 100644
--- a/spaghetti-monster/fsm-adc.h
+++ b/spaghetti-monster/fsm-adc.h
@@ -66,11 +66,12 @@ void battcheck();
 #ifndef THERM_CAL_OFFSET
 #define THERM_CAL_OFFSET 0
 #endif
-// temperature now, in C (ish)
+// temperature now, in C (ish) * 2  (14.1 fixed-point)
 volatile int16_t temperature;
-// temperature in a few seconds, in C (ish) * 4  (13.2 fixed-point)
+// temperature in a few seconds, in C (ish) * 2  (14.1 fixed-point)
 volatile int16_t projected_temperature;  // Fight the future!
-volatile uint8_t therm_ceil = DEFAULT_THERM_CEIL;
+uint8_t therm_ceil = DEFAULT_THERM_CEIL;
+int8_t therm_cal_offset = 0;
 //void low_temperature();
 //void high_temperature();
 volatile uint8_t reset_thermal_history = 1;
-- 
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