merged gchart's Tiny1 series branch for tiny1616 support

13 files changed, 403 insertions, 6 deletions

diff --git a/spaghetti-monster/anduril/BRANDS b/spaghetti-monster/anduril/BRANDS
index b74ddab..acd385e 100644
--- a/spaghetti-monster/anduril/BRANDS
+++ b/spaghetti-monster/anduril/BRANDS
@@ -7,3 +7,4 @@ Lumintop	0300 - 0399
 Fireflies	0400 - 0499
 Mateminco	0500 - 0599
 Sofirn		0600 - 0699
+gChart		1600 - 1699
\ No newline at end of file
diff --git a/spaghetti-monster/anduril/MODELS b/spaghetti-monster/anduril/MODELS
index 52fa200..4dda62f 100644
--- a/spaghetti-monster/anduril/MODELS
+++ b/spaghetti-monster/anduril/MODELS
@@ -38,5 +38,10 @@ Model numbers:
 0611	blf-q8
 0612	sofirn-sp36
 0621	blf-lantern
+0622	sofirn-sp10s
+0631	blf-q8-t1616
+0632	sofirn-sp36-t1616
+0633	blf-lantern-t1616 
+1618	gchart-fet1-t16
 Duplicates:
 Missing:
diff --git a/spaghetti-monster/anduril/cfg-blf-lantern-t1616.h b/spaghetti-monster/anduril/cfg-blf-lantern-t1616.h
new file mode 100644
index 0000000..7905eee
--- /dev/null
+++ b/spaghetti-monster/anduril/cfg-blf-lantern-t1616.h
@@ -0,0 +1,90 @@
+// BLF Lantern config options for Anduril using the Attiny1616
+#define MODEL_NUMBER "0633"
+/* BLF Lantern pinout
+ * PB0 is 5000K channel
+ * PB1 is 3000K channel
+ */
+
+// basically the same as a Q8...  sort of
+#include "hwdef-BLF_Q8-T1616.h"
+// ATTINY: 1616
+
+// the button lights up
+#define USE_INDICATOR_LED
+// the button is visible while main LEDs are on
+#define USE_INDICATOR_LED_WHILE_RAMPING
+// enable blinking indicator LED while off
+#define TICK_DURING_STANDBY
+#define STANDBY_TICK_SPEED 3  // every 0.128 s
+#define USE_FANCIER_BLINKING_INDICATOR
+// off mode: high (2)
+// lockout: blinking (3)
+#define INDICATOR_LED_DEFAULT_MODE ((3<<2) + 2)
+
+// the lantern has two PWM channels, but they drive different sets of emitters
+// (one channel for warm emitters, one channel for cold)
+// so enable a special ramping mode which changes tint instead of brightness
+#define USE_TINT_RAMPING
+// how much to increase total brightness at middle tint
+// (0 = 100% brightness, 64 = 200% brightness)
+//#define TINT_RAMPING_CORRECTION 26  // prototype, 140%
+#define TINT_RAMPING_CORRECTION 10  // production model, 115%
+
+#ifdef RAMP_LENGTH
+#undef RAMP_LENGTH
+#endif
+
+// level_calc.py 1 150 7135 1 30 800
+#define RAMP_LENGTH 150
+#define PWM1_LEVELS 1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,11,11,12,13,13,14,15,15,16,17,18,18,19,20,21,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,43,44,45,46,48,49,50,51,53,54,56,57,58,60,61,63,64,66,67,69,70,72,74,75,77,79,80,82,84,85,87,89,91,93,95,97,98,100,102,104,106,108,111,113,115,117,119,121,124,126,128,130,133,135,137,140,142,145,147,150,152,155,157,160,163,165,168,171,173,176,179,182,185,188,190,193,196,199,202,205,209,212,215,218,221,224,228,231,234,238,241,245,248,251,255
+#define MAX_1x7135 65
+#define HALFSPEED_LEVEL 14
+#define QUARTERSPEED_LEVEL 5
+
+// the default of 26 looks a bit flat, so increase it
+#define CANDLE_AMPLITUDE 40
+
+// override default ramp style
+#undef RAMP_STYLE
+#define RAMP_STYLE 1  // 0 = smooth, 1 = stepped
+// set floor and ceiling as far apart as possible
+// because this lantern isn't overpowered
+#define RAMP_SMOOTH_FLOOR 1
+#define RAMP_SMOOTH_CEIL  150
+#define RAMP_DISCRETE_FLOOR 10
+#define RAMP_DISCRETE_CEIL  RAMP_SMOOTH_CEIL
+#define RAMP_DISCRETE_STEPS 5
+
+// LT1 can handle heat well, so don't limit simple mode
+#define SIMPLE_UI_FLOOR RAMP_DISCRETE_FLOOR
+#define SIMPLE_UI_CEIL RAMP_DISCRETE_CEIL
+#define SIMPLE_UI_STEPS RAMP_DISCRETE_STEPS
+
+#define USE_SOS_MODE
+#define USE_SOS_MODE_IN_BLINKY_GROUP
+
+// the sensor (attiny85) is nowhere near the emitters
+// so thermal regulation can't work
+#ifdef USE_THERMAL_REGULATION
+#undef USE_THERMAL_REGULATION
+#endif
+
+// also, the set_level_gradually() thing isn't compatible with tint ramping
+// (but unsetting it here doesn't actually do anything, because the thermal
+//  regulation define enables it later...  so this is mostly just a note to
+//  make this compatibility issue explicit)
+#ifdef USE_SET_LEVEL_GRADUALLY
+#undef USE_SET_LEVEL_GRADUALLY
+#endif
+
+// don't blink while ramping
+#ifdef BLINK_AT_RAMP_MIDDLE
+#undef BLINK_AT_RAMP_MIDDLE
+#endif
+#ifdef BLINK_AT_RAMP_FLOOR
+#undef BLINK_AT_RAMP_FLOOR
+#endif
+// except the top... blink at the top
+#ifndef BLINK_AT_RAMP_CEIL
+#define BLINK_AT_RAMP_CEIL
+#endif
diff --git a/spaghetti-monster/anduril/cfg-blf-q8-t1616.h b/spaghetti-monster/anduril/cfg-blf-q8-t1616.h
new file mode 100644
index 0000000..e1e1598
--- /dev/null
+++ b/spaghetti-monster/anduril/cfg-blf-q8-t1616.h
@@ -0,0 +1,43 @@
+// BLF Q8 config options for Anduril using the Attiny1616
+#define MODEL_NUMBER "0631"
+#include "hwdef-BLF_Q8-T1616.h"
+// ATTINY: 1616
+
+// the button lights up
+#define USE_INDICATOR_LED
+// the button is visible while main LEDs are on
+#define USE_INDICATOR_LED_WHILE_RAMPING
+// enable blinking indicator LED while off
+#define TICK_DURING_STANDBY
+#define STANDBY_TICK_SPEED 3  // every 0.128 s
+#define USE_FANCIER_BLINKING_INDICATOR
+// off mode: high (2)
+// lockout: blinking (3)
+#define INDICATOR_LED_DEFAULT_MODE ((3<<2) + 2)
+
+// copied from Emisar D4 ramp
+// ../../bin/level_calc.py 1 65 7135 1 0.8 150
+// ... mixed with this:
+// ../../bin/level_calc.py 2 150 7135 4 0.33 150 FET 1 10 1500
+#define RAMP_LENGTH 150
+#define PWM1_LEVELS 1,1,2,2,3,3,4,4,5,6,7,8,9,10,12,13,14,15,17,19,20,22,24,26,29,31,34,36,39,42,45,48,51,55,59,62,66,70,75,79,84,89,93,99,104,110,115,121,127,134,140,147,154,161,168,176,184,192,200,209,217,226,236,245,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,0
+#define PWM2_LEVELS 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,3,4,5,7,8,9,11,12,14,15,17,19,20,22,24,25,27,29,31,33,35,37,39,41,43,45,48,50,52,55,57,59,62,64,67,70,72,75,78,81,84,87,90,93,96,99,102,105,109,112,115,119,122,126,129,133,137,141,144,148,152,156,160,165,169,173,177,182,186,191,195,200,205,209,214,219,224,229,234,239,244,250,255
+#define MAX_1x7135 65
+#define HALFSPEED_LEVEL 14
+#define QUARTERSPEED_LEVEL 5
+
+#define RAMP_SMOOTH_FLOOR 1
+#define RAMP_SMOOTH_CEIL 120
+// 10 28 46 [65] 83 101 120
+#define RAMP_DISCRETE_FLOOR 10
+#define RAMP_DISCRETE_CEIL RAMP_SMOOTH_CEIL
+#define RAMP_DISCRETE_STEPS 7
+
+// safe limit ~50% power
+#define SIMPLE_UI_FLOOR RAMP_DISCRETE_FLOOR
+#define SIMPLE_UI_CEIL RAMP_DISCRETE_CEIL
+#define SIMPLE_UI_STEPS 5
+
+// stop panicking at ~75% power or ~3000 lm, this light has high thermal mass
+#define THERM_FASTER_LEVEL (RAMP_SIZE*9/10)  // throttle back faster when high
+
diff --git a/spaghetti-monster/anduril/cfg-gchart-fet1-t16.h b/spaghetti-monster/anduril/cfg-gchart-fet1-t16.h
new file mode 100644
index 0000000..a6434b8
--- /dev/null
+++ b/spaghetti-monster/anduril/cfg-gchart-fet1-t16.h
@@ -0,0 +1,34 @@
+// gChart's custom FET+1 driver config options for Anduril
+#define MODEL_NUMBER "1618" // Golden Ratio... because I can
+#include "hwdef-gchart-fet1-t16.h"
+// ATTINY: 1616
+
+// the button lights up
+#define USE_INDICATOR_LED
+// the button is visible while main LEDs are on
+#define USE_INDICATOR_LED_WHILE_RAMPING
+// enable blinking indicator LED while off
+#define TICK_DURING_STANDBY
+
+#undef BLINK_AT_RAMP_MIDDLE
+
+// Mostly borrowed from the D4 for now
+#define RAMP_LENGTH 150
+#define PWM1_LEVELS 1,1,2,2,3,3,4,4,5,6,7,8,9,10,12,13,14,15,17,19,20,22,24,26,29,31,34,36,39,42,45,48,51,55,59,62,66,70,75,79,84,89,93,99,104,110,115,121,127,134,140,147,154,161,168,176,184,192,200,209,217,226,236,245,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,0
+#define PWM2_LEVELS 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,3,4,5,7,8,9,11,12,14,15,17,19,20,22,24,25,27,29,31,33,35,37,39,41,43,45,48,50,52,55,57,59,62,64,67,70,72,75,78,81,84,87,90,93,96,99,102,105,109,112,115,119,122,126,129,133,137,141,144,148,152,156,160,165,169,173,177,182,186,191,195,200,205,209,214,219,224,229,234,239,244,250,255
+#define MAX_1x7135 65
+#define HALFSPEED_LEVEL 14
+#define QUARTERSPEED_LEVEL 6
+
+#define RAMP_SMOOTH_FLOOR 1
+#define RAMP_SMOOTH_CEIL 120
+// 10, 28, 46, [65], 83, 101, 120
+#define RAMP_DISCRETE_FLOOR 10
+#define RAMP_DISCRETE_CEIL RAMP_SMOOTH_CEIL
+#define RAMP_DISCRETE_STEPS 7
+
+// stop panicking at ~30% power
+#define THERM_FASTER_LEVEL 105
+
+// enable 2 click turbo
+#define USE_2C_MAX_TURBO
diff --git a/spaghetti-monster/anduril/cfg-sofirn-sp10s.h b/spaghetti-monster/anduril/cfg-sofirn-sp10s.h
new file mode 100644
index 0000000..054b1db
--- /dev/null
+++ b/spaghetti-monster/anduril/cfg-sofirn-sp10s.h
@@ -0,0 +1,28 @@
+// gChart's custom SP10S  driver config options for Anduril
+#define MODEL_NUMBER "0622"
+#include "hwdef-Sofirn_SP10S.h"
+// ATTINY: 1616
+
+#undef BLINK_AT_RAMP_MIDDLE
+
+#define USE_DYNAMIC_UNDERCLOCKING
+
+#define RAMP_LENGTH 150
+#define PWM1_LEVELS 20,30,41,54,69,87,106,128,152,179,209,242,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,0
+#define PWM2_LEVELS 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,2,2,2,2,3,3,3,4,4,4,5,5,5,6,6,7,7,8,8,9,9,10,10,11,12,12,13,14,14,15,16,17,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,33,34,35,36,38,39,41,42,43,45,46,48,50,51,53,55,56,58,60,62,64,66,68,70,72,74,76,78,80,83,85,87,90,92,94,97,99,102,105,107,110,113,116,119,121,124,127,130,133,137,140,143,146,150,153,156,160,164,167,171,174,178,182,186,190,194,198,202,206,210,214,219,223,227,232,236,241,246,250,255
+
+#define MAX_1x7135 13
+#define HALFSPEED_LEVEL 14
+#define QUARTERSPEED_LEVEL 6
+
+#define RAMP_SMOOTH_FLOOR 1
+#define RAMP_SMOOTH_CEIL 120
+#define RAMP_DISCRETE_FLOOR 10
+#define RAMP_DISCRETE_CEIL RAMP_SMOOTH_CEIL
+#define RAMP_DISCRETE_STEPS 7
+
+// stop panicking at ~30% power
+#define THERM_FASTER_LEVEL 105
+
+// enable 2 click turbo
+#define USE_2C_MAX_TURBO
diff --git a/spaghetti-monster/anduril/cfg-sofirn-sp36-t1616.h b/spaghetti-monster/anduril/cfg-sofirn-sp36-t1616.h
new file mode 100644
index 0000000..8eb7a5d
--- /dev/null
+++ b/spaghetti-monster/anduril/cfg-sofirn-sp36-t1616.h
@@ -0,0 +1,33 @@
+// Sofirn SP36 (small Q8) config options for Anduril using the Attiny1616
+// same as  the  BLF Q8, mostly
+#include "cfg-blf-q8-t1616.h"
+#undef MODEL_NUMBER
+#define MODEL_NUMBER "0632"
+// ATTINY: 1616
+
+// voltage readings were a little high with the Q8 value
+#undef VOLTAGE_FUDGE_FACTOR
+#define VOLTAGE_FUDGE_FACTOR 5  // add 0.25V, not 0.35V
+
+// the high button LED mode on this light uses too much power
+// off mode: low (1)
+// lockout: blinking (3)
+#ifdef INDICATOR_LED_DEFAULT_MODE
+#undef INDICATOR_LED_DEFAULT_MODE
+#define INDICATOR_LED_DEFAULT_MODE ((3<<2) + 1)
+#endif
+
+// don't blink during the ramp; the button LED brightness is sufficient
+// to indicate which power channel(s) are being used
+#ifdef BLINK_AT_RAMP_MIDDLE
+#undef BLINK_AT_RAMP_MIDDLE
+#endif
+#ifdef BLINK_AT_RAMP_CEIL
+#undef BLINK_AT_RAMP_CEIL
+#endif
+
+// stop panicking at ~60% power or ~3000 lm
+#ifdef THERM_FASTER_LEVEL
+#undef THERM_FASTER_LEVEL
+#endif
+#define THERM_FASTER_LEVEL 130
diff --git a/spaghetti-monster/anduril/version.h b/spaghetti-monster/anduril/version.h
index 8cf3c90..14502aa 100644
--- a/spaghetti-monster/anduril/version.h
+++ b/spaghetti-monster/anduril/version.h
@@ -1,4 +1 @@
-// this file is replaced automatically by the build script
-// set your own date here if you're not using the build script
-// otherwise, default to first human contact with the moon
-#define VERSION_NUMBER "19690720"
+#define VERSION_NUMBER "20210201"
diff --git a/spaghetti-monster/fsm-adc.c b/spaghetti-monster/fsm-adc.c
index 71ecf65..975d12e 100644
--- a/spaghetti-monster/fsm-adc.c
+++ b/spaghetti-monster/fsm-adc.c
@@ -37,6 +37,9 @@ static inline void set_admux_therm() {
     #elif (ATTINY == 841)  // FIXME: not tested
         ADMUXA = ADMUXA_THERM;
         ADMUXB = ADMUXB_THERM;
+    #elif defined(AVRXMEGA3)  // ATTINY816, 817, etc
+        ADC0.MUXPOS = ADC_MUXPOS_TEMPSENSE_gc;  // read temperature
+        ADC0.CTRLC = ADC_SAMPCAP_bm | ADC_PRESC_DIV64_gc | ADC_REFSEL_INTREF_gc; // Internal ADC reference
     #else
         #error Unrecognized MCU type
     #endif
@@ -66,6 +69,15 @@ inline void set_admux_voltage() {
             ADMUXA = ADMUXA_VCC;
             ADMUXB = ADMUXB_VCC;
         #endif
+    #elif defined(AVRXMEGA3)  // ATTINY816, 817, etc
+        #ifdef USE_VOLTAGE_DIVIDER  // 1.1V / ADC input pin
+            // verify that this is correct!!!  untested
+            ADC0.MUXPOS = ADMUX_VOLTAGE_DIVIDER;  // read the requested ADC pin
+            ADC0.CTRLC = ADC_SAMPCAP_bm | ADC_PRESC_DIV64_gc | ADC_REFSEL_INTREF_gc; // Use internal ADC reference
+        #else  // VCC / 1.1V reference
+            ADC0.MUXPOS = ADC_MUXPOS_INTREF_gc;  // read internal reference
+            ADC0.CTRLC = ADC_SAMPCAP_bm | ADC_PRESC_DIV64_gc | ADC_REFSEL_VDDREF_gc; // Vdd (Vcc) be ADC reference
+        #endif
     #else
         #error Unrecognized MCU type
     #endif
@@ -77,6 +89,9 @@ inline void set_admux_voltage() {
 inline void ADC_start_measurement() {
     #if (ATTINY == 25) || (ATTINY == 45) || (ATTINY == 85) || (ATTINY == 841) || (ATTINY == 1634)
         ADCSRA |= (1 << ADSC) | (1 << ADIE);
+    #elif defined(AVRXMEGA3)  // ATTINY816, 817, etc
+        ADC0.INTCTRL |= ADC_RESRDY_bm; // enable interrupt
+        ADC0.COMMAND |= ADC_STCONV_bm; // Start the ADC conversions
     #else
         #error unrecognized MCU type
     #endif
@@ -108,13 +123,22 @@ inline void ADC_on()
         // enable, start, auto-retrigger, prescale
         ADCSRA = (1 << ADEN) | (1 << ADSC) | (1 << ADATE) | ADC_PRSCL;
         //ADCSRA |= (1 << ADSC);  // start measuring
+    #elif defined(AVRXMEGA3)  // ATTINY816, 817, etc
+        set_admux_voltage();
+        VREF.CTRLA |= VREF_ADC0REFSEL_1V1_gc; // Set Vbg ref to 1.1V
+        ADC0.CTRLA = ADC_ENABLE_bm | ADC_FREERUN_bm; // Enabled, free-running (aka, auto-retrigger)
+        ADC0.COMMAND |= ADC_STCONV_bm; // Start the ADC conversions    
     #else
         #error Unrecognized MCU type
     #endif
 }
 
 inline void ADC_off() {
-    ADCSRA &= ~(1<<ADEN); //ADC off
+    #ifdef AVRXMEGA3  // ATTINY816, 817, etc
+        ADC0.CTRLA &= ~(ADC_ENABLE_bm);  // disable the ADC 
+    #else
+        ADCSRA &= ~(1<<ADEN); //ADC off
+    #endif
 }
 
 #ifdef USE_VOLTAGE_DIVIDER
@@ -140,9 +164,16 @@ static inline uint8_t calc_voltage_divider(uint16_t value) {
 #define ADC_CYCLES_PER_SECOND 2
 #endif
 
+#ifdef AVRXMEGA3  // ATTINY816, 817, etc
+#define ADC_vect ADC0_RESRDY_vect
+#endif
 // happens every time the ADC sampler finishes a measurement
 ISR(ADC_vect) {
 
+    #ifdef AVRXMEGA3  // ATTINY816, 817, etc
+    ADC0.INTFLAGS = ADC_RESRDY_bm; // clear the interrupt
+    #endif
+
     if (adc_sample_count) {
 
         uint16_t m;  // latest measurement
@@ -150,7 +181,23 @@ ISR(ADC_vect) {
         uint8_t channel = adc_channel;
 
         // update the latest value
+        #ifdef AVRXMEGA3  // ATTINY816, 817, etc
+        // Use the factory calibrated values in SIGROW.TEMPSENSE0 and SIGROW.TEMPSENSE1
+        // to calculate a temperature reading in Kelvin, then left-align it. 
+        if (channel == 1) { // thermal, convert ADC reading to left-aligned Kelvin
+            int8_t sigrow_offset = SIGROW.TEMPSENSE1; // Read signed value from signature row
+            uint8_t sigrow_gain = SIGROW.TEMPSENSE0; // Read unsigned value from signature row
+            uint32_t temp = ADC0.RES - sigrow_offset;
+            temp *= sigrow_gain; // Result might overflow 16 bit variable (10bit+8bit)
+            temp += 0x80; // Add 1/2 to get correct rounding on division below
+            temp >>= 8; // Divide result to get Kelvin
+            m = (temp << 6); // left align it
+        } 
+        else { m = (ADC0.RES << 6); } // voltage, force left-alignment
+
+        #else
         m = ADC;
+        #endif
         adc_raw[channel] = m;
 
         // lowpass the value
@@ -181,8 +228,12 @@ void adc_deferred() {
     // real-world entropy makes this a true random, not pseudo
     // Why here instead of the ISR?  Because it makes the time-critical ISR
     // code a few cycles faster and we don't need crypto-grade randomness.
+    #ifdef AVRXMEGA3  // ATTINY816, 817, etc
+    pseudo_rand_seed += ADC0.RESL; // right aligned, not left... so should be equivalent?
+    #else
     pseudo_rand_seed += (ADCL >> 6) + (ADCH << 2);
     #endif
+    #endif
 
     // the ADC triggers repeatedly when it's on, but we only need to run the
     // voltage and temperature regulation stuff once in a while...so disable
@@ -290,7 +341,11 @@ static inline void ADC_voltage_handler() {
     if (lvp_timer) {
         lvp_timer --;
     } else {  // it has been long enough since the last warning
+    	#ifdef DUAL_VOLTAGE_FLOOR
+    	if (((voltage < VOLTAGE_LOW) && (voltage > DUAL_VOLTAGE_FLOOR)) || (voltage < DUAL_VOLTAGE_LOW_LOW)) {
+    	#else
         if (voltage < VOLTAGE_LOW) {
+        #endif
             // send out a warning
             emit(EV_voltage_low, 0);
             // reset rate-limit counter
diff --git a/spaghetti-monster/fsm-main.c b/spaghetti-monster/fsm-main.c
index b96bce8..f3c319c 100644
--- a/spaghetti-monster/fsm-main.c
+++ b/spaghetti-monster/fsm-main.c
@@ -23,6 +23,9 @@
 #include "fsm-main.h"
 
 #if PWM_CHANNELS == 4
+#ifdef AVRXMEGA3  // ATTINY816, 817, etc
+#error 4-channel PWM not currently set up for the AVR 1-Series
+#endif
 // 4th PWM channel requires manually turning the pin on/off via interrupt :(
 ISR(TIMER1_OVF_vect) {
     //bitClear(PORTB, 3);
@@ -68,7 +71,7 @@ static inline void hw_setup() {
     PORTB = (1 << SWITCH_PIN);  // e-switch is the only input
     PCMSK = (1 << SWITCH_PIN);  // pin change interrupt uses this pin
 }
-#elif (ATTINY == 1634)
+#elif (ATTINY == 1634) || defined(AVRXMEGA3)  // ATTINY816, 817, etc
 static inline void hw_setup() {
     // this gets tricky with so many pins...
     // ... so punt it to the hwdef file
@@ -82,7 +85,11 @@ static inline void hw_setup() {
 //#ifdef USE_REBOOT
 static inline void prevent_reboot_loop() {
     // prevent WDT from rebooting MCU again
+    #ifdef AVRXMEGA3  // ATTINY816, 817, etc
+    RSTCTRL.RSTFR &= ~(RSTCTRL_WDRF_bm);  // reset status flag
+    #else
     MCUSR &= ~(1<<WDRF);  // reset status flag
+    #endif
     wdt_disable();
 }
 //#endif
diff --git a/spaghetti-monster/fsm-misc.c b/spaghetti-monster/fsm-misc.c
index 15cb659..edd982a 100644
--- a/spaghetti-monster/fsm-misc.c
+++ b/spaghetti-monster/fsm-misc.c
@@ -110,6 +110,35 @@ uint8_t blink_num(uint8_t num) {
 #ifdef USE_INDICATOR_LED
 void indicator_led(uint8_t lvl) {
     switch (lvl) {
+        #ifdef AVRXMEGA3  // ATTINY816, 817, etc
+        case 0:  // indicator off
+            AUXLED_PORT.DIRSET = (1 << AUXLED_PIN); // set as output
+            AUXLED_PORT.OUTCLR = (1 << AUXLED_PIN); // set output low
+            #ifdef AUXLED2_PIN  // second LED mirrors the first
+            AUXLED2_PORT.DIRSET = (1 << AUXLED2_PIN); // set as output
+            AUXLED2_PORT.OUTCLR = (1 << AUXLED2_PIN); // set output low
+            #endif
+            break;
+        case 1:  // indicator low
+            AUXLED_PORT.DIRCLR = (1 << AUXLED_PIN); // set as input
+            // this resolves to PORTx.PINxCTRL = PORT_PULLUPEN_bm;
+            *((uint8_t *)&AUXLED_PORT + 0x10 + AUXLED_PIN) = PORT_PULLUPEN_bm; // enable internal pull-up
+            #ifdef AUXLED2_PIN  // second LED mirrors the first
+            AUXLED2_PORT.DIRCLR = (1 << AUXLED2_PIN); // set as input
+            // this resolves to PORTx.PINxCTRL = PORT_PULLUPEN_bm;
+            *((uint8_t *)&AUXLED2_PORT + 0x10 + AUXLED2_PIN) = PORT_PULLUPEN_bm; // enable internal pull-up
+            #endif
+            break;
+        default:  // indicator high
+            AUXLED_PORT.DIRSET = (1 << AUXLED_PIN); // set as output
+            AUXLED_PORT.OUTSET = (1 << AUXLED_PIN); // set as high
+            #ifdef AUXLED2_PIN  // second LED mirrors the first
+            AUXLED2_PORT.DIRSET = (1 << AUXLED2_PIN); // set as output
+            AUXLED2_PORT.OUTSET = (1 << AUXLED2_PIN); // set as high
+            #endif
+            break;
+      
+        #else
         case 0:  // indicator off
             DDRB &= 0xff ^ (1 << AUXLED_PIN);
             PORTB &= 0xff ^ (1 << AUXLED_PIN);
@@ -134,6 +163,8 @@ void indicator_led(uint8_t lvl) {
             PORTB |= (1 << AUXLED2_PIN);
             #endif
             break;
+
+        #endif
     }
 }
 
@@ -150,6 +181,24 @@ void indicator_led_auto() {
 // TODO: Refactor this and RGB LED function to merge code and save space
 void button_led_set(uint8_t lvl) {
     switch (lvl) {
+
+        #ifdef AVRXMEGA3  // ATTINY816, 817, etc
+        case 0:  // LED off
+            BUTTON_LED_PORT.DIRSET = (1 << BUTTON_LED_PIN); // set as output
+            BUTTON_LED_PORT.OUTCLR = (1 << BUTTON_LED_PIN); // set output low
+            break;
+        case 1:  // LED low
+            BUTTON_LED_PORT.DIRCLR = (1 << BUTTON_LED_PIN); // set as input
+            // this resolves to PORTx.PINxCTRL = PORT_PULLUPEN_bm;
+            *((uint8_t *)&BUTTON_LED_PORT + 0x10 + BUTTON_LED_PIN) = PORT_PULLUPEN_bm; // enable internal pull-up
+            break;
+        default:  // LED high
+            BUTTON_LED_PORT.DIRSET = (1 << BUTTON_LED_PIN); // set as output
+            BUTTON_LED_PORT.OUTSET = (1 << BUTTON_LED_PIN); // set as high
+            break;
+
+        #else
+        
         case 0:  // LED off
             BUTTON_LED_DDR  &= 0xff ^ (1 << BUTTON_LED_PIN);
             BUTTON_LED_PUE  &= 0xff ^ (1 << BUTTON_LED_PIN);
@@ -165,6 +214,8 @@ void button_led_set(uint8_t lvl) {
             BUTTON_LED_PUE  |= (1 << BUTTON_LED_PIN);
             BUTTON_LED_PORT |= (1 << BUTTON_LED_PIN);
             break;
+
+        #endif
     }
 }
 #endif
@@ -177,6 +228,24 @@ void rgb_led_set(uint8_t value) {
         uint8_t lvl = (value >> (i<<1)) & 0x03;
         uint8_t pin = pins[i];
         switch (lvl) {
+        
+            #ifdef AVRXMEGA3  // ATTINY816, 817, etc
+            case 0:  // LED off
+                AUXLED_RGB_PORT.DIRSET = (1 << pin); // set as output
+                AUXLED_RGB_PORT.OUTCLR = (1 << pin); // set output low
+                break;
+            case 1:  // LED low
+                AUXLED_RGB_PORT.DIRCLR = (1 << pin); // set as input
+                // this resolves to PORTx.PINxCTRL = PORT_PULLUPEN_bm;
+                *((uint8_t *)&AUXLED_RGB_PORT + 0x10 + pin) = PORT_PULLUPEN_bm; // enable internal pull-up
+                break;
+            default:  // LED high
+                AUXLED_RGB_PORT.DIRSET = (1 << pin); // set as output
+                AUXLED_RGB_PORT.OUTSET = (1 << pin); // set as high
+                break;
+
+            #else
+        
             case 0:  // LED off
                 AUXLED_RGB_DDR  &= 0xff ^ (1 << pin);
                 AUXLED_RGB_PUE  &= 0xff ^ (1 << pin);
@@ -192,6 +261,9 @@ void rgb_led_set(uint8_t value) {
                 AUXLED_RGB_PUE  |= (1 << pin);
                 AUXLED_RGB_PORT |= (1 << pin);
                 break;
+                
+            #endif
+                    
         }
     }
 }
@@ -217,6 +289,9 @@ void reboot() {
         // reset (WDIF + WDE), no WDIE, fastest (16ms) timing (0000)
         // (DS section 8.5.2 and table 8-4)
         WDTCSR = 0b10001000;
+    #elif defined(AVRXMEGA3)  // ATTINY816, 817, etc
+        CCP = CCP_IOREG_gc;  // temporarily disable change protection
+        WDT.CTRLA = WDT_PERIOD_8CLK_gc;  // Enable, timeout 8ms
     #endif
     sei();
     wdt_reset();
diff --git a/spaghetti-monster/fsm-pcint.c b/spaghetti-monster/fsm-pcint.c
index 24cc82c..4a3c193 100644
--- a/spaghetti-monster/fsm-pcint.c
+++ b/spaghetti-monster/fsm-pcint.c
@@ -46,6 +46,8 @@ inline void PCINT_on() {
         #else
         GIMSK |= (1 << SWITCH_PCIE);
         #endif
+    #elif defined(AVRXMEGA3)  // ATTINY816, 817, etc)
+        SWITCH_ISC_REG |= PORT_ISC_BOTHEDGES_gc;
     #else
         #error Unrecognized MCU type
     #endif
@@ -58,6 +60,8 @@ inline void PCINT_off() {
     #elif (ATTINY == 1634)
         // disable all pin-change interrupts
         GIMSK &= ~(1 << SWITCH_PCIE);
+    #elif defined(AVRXMEGA3)  // ATTINY816, 817, etc)
+        SWITCH_ISC_REG &= ~(PORT_ISC_gm);
     #else
         #error Unrecognized MCU type
     #endif
@@ -73,6 +77,11 @@ ISR(PCINT0_vect) {
 #endif
     irq_pcint = 1;
 }
+#elif defined(AVRXMEGA3)  // ATTINY816, 817, etc)
+ISR(SWITCH_VECT) {
+    SWITCH_INTFLG |= (1 << SWITCH_PIN);  // Write a '1' to clear the interrupt flag
+    irq_pcint = 1;
+}
 #else
     #error Unrecognized MCU type
 #endif
diff --git a/spaghetti-monster/fsm-wdt.c b/spaghetti-monster/fsm-wdt.c
index 9e8d9af..ea2efac 100644
--- a/spaghetti-monster/fsm-wdt.c
+++ b/spaghetti-monster/fsm-wdt.c
@@ -23,6 +23,10 @@
 #include <avr/interrupt.h>
 #include <avr/wdt.h>
 
+// *** Note for the AVRXMEGA3 (1-Series, eg 816 and 817), the WDT 
+// is not used for time-based interrupts.  A new peripheral, the 
+// Periodic Interrupt Timer ("PIT") is used for this purpose.
+
 void WDT_on()
 {
     #if (ATTINY == 25) || (ATTINY == 45) || (ATTINY == 85)
@@ -35,6 +39,10 @@ void WDT_on()
     #elif (ATTINY == 1634)
         wdt_reset();                    // Reset the WDT
         WDTCSR = (1<<WDIE);             // Enable interrupt every 16ms
+    #elif defined(AVRXMEGA3)  // ATTINY816, 817, etc
+        RTC.PITINTCTRL = RTC_PI_bm;   // enable the Periodic Interrupt
+        while (RTC.PITSTATUS > 0) {}  // make sure the register is ready to be updated
+        RTC.PITCTRLA = RTC_PERIOD_CYC512_gc | RTC_PITEN_bm; // Period = 16ms, enable the PI Timer
     #else
         #error Unrecognized MCU type
     #endif
@@ -53,6 +61,10 @@ inline void WDT_slow()
     #elif (ATTINY == 1634)
         wdt_reset();                    // Reset the WDT
         WDTCSR = (1<<WDIE) | STANDBY_TICK_SPEED;
+    #elif defined(AVRXMEGA3)  // ATTINY816, 817, etc
+        RTC.PITINTCTRL = RTC_PI_bm;   // enable the Periodic Interrupt
+        while (RTC.PITSTATUS > 0) {}  // make sure the register is ready to be updated
+        RTC.PITCTRLA = (1<<6) | (STANDBY_TICK_SPEED<<3) | RTC_PITEN_bm; // Set period, enable the PI Timer
     #else
         #error Unrecognized MCU type
     #endif
@@ -75,13 +87,21 @@ inline void WDT_off()
         CCP = 0xD8;           // enable config changes
         WDTCSR = 0;           // disable and clear all WDT settings
         sei();
+    #elif defined(AVRXMEGA3)  // ATTINY816, 817, etc
+        while (RTC.PITSTATUS > 0) {}  // make sure the register is ready to be updated
+        RTC.PITCTRLA = 0; // Disable the PI Timer
     #else
         #error Unrecognized MCU type
     #endif
 }
 
 // clock tick -- this runs every 16ms (62.5 fps)
+#ifdef AVRXMEGA3  // ATTINY816, 817, etc
+ISR(RTC_PIT_vect) {
+    RTC.PITINTFLAGS = RTC_PI_bm; // clear the PIT interrupt flag 
+#else
 ISR(WDT_vect) {
+#endif
     irq_wdt = 1;  // WDT event happened
 }