From d1f8589596a082a9a1a9e3d9c7d3c4180fe57e94 Mon Sep 17 00:00:00 2001
From: Selene ToyKeeper
Date: Mon, 7 Sep 2020 00:27:22 -0600
Subject: added support for external thermal sensors in fsm-adc.c

---
 spaghetti-monster/fsm-adc.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

(limited to 'spaghetti-monster/fsm-adc.c')

diff --git a/spaghetti-monster/fsm-adc.c b/spaghetti-monster/fsm-adc.c
index 4fc777b..91562a2 100644
--- a/spaghetti-monster/fsm-adc.c
+++ b/spaghetti-monster/fsm-adc.c
@@ -20,6 +20,14 @@
 #ifndef FSM_ADC_C
 #define FSM_ADC_C
 
+// override onboard temperature sensor definition, if relevant
+#ifdef USE_EXTERNAL_TEMP_SENSOR
+#ifdef ADMUX_THERM
+#undef ADMUX_THERM
+#endif
+#define ADMUX_THERM ADMUX_THERM_EXTERNAL_SENSOR
+#endif
+
 
 static inline void set_admux_therm() {
     #if (ATTINY == 1634)
@@ -335,7 +343,13 @@ static inline void ADC_temperature_handler() {
 
     // let the UI see the current temperature in C
     // Convert ADC units to Celsius (ish)
+    #ifndef USE_EXTERNAL_TEMP_SENSOR
+    // onboard sensor for attiny25/45/85/1634
     temperature = (measurement>>1) + THERM_CAL_OFFSET + (int16_t)therm_cal_offset - 275;
+    #else
+    // external sensor
+    temperature = EXTERN_TEMP_FORMULA(measurement>>1) + THERM_CAL_OFFSET + (int16_t)therm_cal_offset;
+    #endif
 
     // how much has the temperature changed between now and a few seconds ago?
     int16_t diff;
-- 
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