Add AVR 1-Series and t1616 board and scripts

13 files changed, 320 insertions, 8 deletions

diff --git a/bin/build.sh b/bin/build.sh
index 3992c38..6c21e30 100755
--- a/bin/build.sh
+++ b/bin/build.sh
@@ -12,10 +12,11 @@ fi
 export ATTINY=$1 ; shift
 export PROGRAM=$1 ; shift
 export MCU=attiny$ATTINY
+export DFP=~/avr/attiny_dfp
 export CC=avr-gcc
 export OBJCOPY=avr-objcopy
-export CFLAGS="-Wall -g -Os -mmcu=$MCU -c -std=gnu99 -fgnu89-inline -fwhole-program -DATTINY=$ATTINY -I.. -I../.. -I../../.. -fshort-enums"
-export OFLAGS="-Wall -g -Os -mmcu=$MCU"
+export CFLAGS="-Wall -g -Os -mmcu=$MCU -c -std=gnu99 -fgnu89-inline -fwhole-program -DATTINY=$ATTINY -I.. -I../.. -I../../.. -fshort-enums  -B $DFP/gcc/dev/$MCU/ -I $DFP/include/"
+export OFLAGS="-Wall -g -Os -mmcu=$MCU -B $DFP/gcc/dev/$MCU/ -I $DFP/include/"
 export LDFLAGS="-fgnu89-inline"
 export OBJCOPYFLAGS='--set-section-flags=.eeprom=alloc,load --change-section-lma .eeprom=0 --no-change-warnings -O ihex'
 export OBJS=$PROGRAM.o
diff --git a/bin/flash-tiny1616.sh b/bin/flash-tiny1616.sh
new file mode 100755
index 0000000..31c8406
--- /dev/null
+++ b/bin/flash-tiny1616.sh
@@ -0,0 +1,3 @@
+#/bin/sh
+FIRMWARE=$1
+avrdude -c jtag2updi -P /dev/ttyUSB0 -p t1616 -u -Uflash:w:$FIRMWARE
\ No newline at end of file
diff --git a/hwdef-gchart-fet1-t16.h b/hwdef-gchart-fet1-t16.h
new file mode 100644
index 0000000..3a79586
--- /dev/null
+++ b/hwdef-gchart-fet1-t16.h
@@ -0,0 +1,101 @@
+#ifndef HWDEF_GCH_FET1_T16_H
+#define HWDEF_GCH_FET1_T16_H
+
+/* gChart's custom FET+1 driver layout
+
+PB0 - PWM for FET (TCA - WO0)
+PB1 - PWM for 7135 (TCA - WO1)
+PB2 - Switch pin, internal pullup
+PB3 - Aux LED with 4700 Ohm series resistor
+Read voltage from VCC pin, has diode with ~0.4v drop
+
+*/
+
+
+#define LAYOUT_DEFINED
+
+#ifdef ATTINY
+#undef ATTINY
+#endif
+#define ATTINY 1616
+#include <avr/io.h>
+
+#define PWM_CHANNELS 2
+
+#ifndef SWITCH_PIN
+#define SWITCH_PIN     2    
+#define SWITCH_PORT    VPORTB.IN
+#define SWITCH_ISC_REG PORTB.PIN2CTRL
+#define SWITCH_VECT    PORTB_PORT_vect
+#define SWITCH_INTFLG  VPORTB.INTFLAGS
+//#define SWITCH_ISC_REG  _SFR_MEM8(&PORTB + 0x10 + SWITCH_PIN)
+#endif
+
+
+// 7135 channel
+#ifndef PWM1_PIN
+#define PWM1_PIN PB1               // 
+#define PWM1_LVL TCA0.SINGLE.CMP1  // CMP1 is the output compare register for PB1
+#endif
+
+// FET channel
+#ifndef PWM2_PIN
+#define PWM2_PIN PB0               // 
+#define PWM2_LVL TCA0.SINGLE.CMP0  // CMP0 is the output compare register for PB0
+#endif
+
+// average drop across diode on this hardware
+#ifndef VOLTAGE_FUDGE_FACTOR
+#define VOLTAGE_FUDGE_FACTOR 8  // 4 = add 0.20V
+#endif
+
+
+// lighted button
+#ifndef AUXLED_PIN
+#define AUXLED_PIN  PIN3_bm
+#define AUXLED_PORT PORTB
+#define AUXLED_CTRL PIN3CTRL
+#endif
+
+
+// with so many pins, doing this all with #ifdefs gets awkward...
+// ... so just hardcode it in each hwdef file instead
+inline void hwdef_setup() {
+
+	// set up the system clock to run at 5 MHz instead of the default 3.33 MHz
+	_PROTECTED_WRITE( CLKCTRL.MCLKCTRLB, CLKCTRL_PDIV_4X_gc | CLKCTRL_PEN_bm );
+
+    //VPORTA.DIR = 0b00000010;
+    VPORTB.DIR = PIN0_bm | PIN1_bm | PIN3_bm;
+    //VPORTC.DIR = 0b00000000;
+
+    // enable pullups on the input pins to reduce power
+    PORTA.PIN0CTRL = PORT_PULLUPEN_bm;
+    PORTA.PIN1CTRL = PORT_PULLUPEN_bm;
+    PORTA.PIN2CTRL = PORT_PULLUPEN_bm;
+    PORTA.PIN3CTRL = PORT_PULLUPEN_bm;
+    PORTA.PIN4CTRL = PORT_PULLUPEN_bm;
+    PORTA.PIN5CTRL = PORT_PULLUPEN_bm;
+    PORTA.PIN6CTRL = PORT_PULLUPEN_bm;
+    PORTA.PIN7CTRL = PORT_PULLUPEN_bm;
+    
+    //PORTB.PIN0CTRL = PORT_PULLUPEN_bm; // FET channel
+    //PORTB.PIN1CTRL = PORT_PULLUPEN_bm; // 7135 channel
+    PORTB.PIN2CTRL = PORT_PULLUPEN_bm | PORT_ISC_BOTHEDGES_gc;  // switch
+    //PORTB.PIN3CTRL = PORT_PULLUPEN_bm; // Aux LED
+    PORTB.PIN4CTRL = PORT_PULLUPEN_bm;
+    PORTB.PIN5CTRL = PORT_PULLUPEN_bm;
+    
+    PORTC.PIN0CTRL = PORT_PULLUPEN_bm;
+    PORTC.PIN1CTRL = PORT_PULLUPEN_bm;
+    PORTC.PIN2CTRL = PORT_PULLUPEN_bm;
+    PORTC.PIN3CTRL = PORT_PULLUPEN_bm;
+  
+  	// set up the PWM
+    TCA0.SINGLE.CTRLB = TCA_SINGLE_CMP0EN_bm | TCA_SINGLE_CMP1EN_bm | TCA_SINGLE_WGMODE_SINGLESLOPE_gc;
+    TCA0.SINGLE.PER = 255;
+    TCA0.SINGLE.CTRLA = TCA_SINGLE_CLKSEL_DIV1_gc | TCA_SINGLE_ENABLE_bm;
+}
+
+
+#endif
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 84d6795..4ad4635 100644
--- a/spaghetti-monster/anduril/MODELS
+++ b/spaghetti-monster/anduril/MODELS
@@ -36,5 +36,6 @@ Model numbers:
 0611	blf-q8
 0612	sofirn-sp36
 0621	blf-lantern
+1618	gchart-fet1-t16
 Duplicates:
 Missing:
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..42333a4
--- /dev/null
+++ b/spaghetti-monster/anduril/cfg-gchart-fet1-t16.h
@@ -0,0 +1,39 @@
+// 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
+
+// battery readout style (pick one)
+#define BATTCHECK_VpT
+//#define BATTCHECK_8bars  // FIXME: breaks build
+//#define BATTCHECK_4bars  // FIXME: breaks build
+
+//#undef USE_DYNAMIC_UNDERCLOCKING
+#define USE_DYNAMIC_UNDERCLOCKING
+
+// 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
\ No newline at end of file
diff --git a/spaghetti-monster/anduril/version.h b/spaghetti-monster/anduril/version.h
index 8cf3c90..5ecfc65 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 "20201218"
diff --git a/spaghetti-monster/fsm-adc.c b/spaghetti-monster/fsm-adc.c
index 71ecf65..2818731 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
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..7ba9b45 100644
--- a/spaghetti-monster/fsm-misc.c
+++ b/spaghetti-monster/fsm-misc.c
@@ -110,6 +110,33 @@ 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 = AUXLED_PIN; // set as output
+            AUXLED_PORT.OUTCLR = AUXLED_PIN; // set output low
+            #ifdef AUXLED2_PIN  // second LED mirrors the first
+            AUXLED2_PORT.DIRSET = AUXLED2_PIN; // set as output
+            AUXLED2_PORT.OUTCLR = AUXLED2_PIN; // set output low
+            #endif
+            break;
+        case 1:  // indicator low
+            AUXLED_PORT.DIRCLR = AUXLED_PIN; // set as input
+            AUXLED_PORT.AUXLED_CTRL = PORT_PULLUPEN_bm; // enable internal pull-up
+            #ifdef AUXLED2_PIN  // second LED mirrors the first
+            AUXLED2_PORT.DIRCLR = AUXLE2D_PIN; // set as input
+            AUXLED2_PORT.AUXLED2_CTRL = PORT_PULLUPEN_bm; // enable internal pull-up
+            #endif
+            break;
+        default:  // indicator high
+            AUXLED_PORT.DIRSET = AUXLED_PIN; // set as output
+            AUXLED_PORT.OUTSET = AUXLED_PIN; // set as high
+            #ifdef AUXLED2_PIN  // second LED mirrors the first
+            AUXLED2_PORT.DIRSET = AUXLED2_PIN; // set as output
+            AUXLED2_PORT.OUTSET = AUXLED2_PIN; // set as high
+            #endif
+            break;
+      
+        #else
         case 0:  // indicator off
             DDRB &= 0xff ^ (1 << AUXLED_PIN);
             PORTB &= 0xff ^ (1 << AUXLED_PIN);
@@ -134,6 +161,8 @@ void indicator_led(uint8_t lvl) {
             PORTB |= (1 << AUXLED2_PIN);
             #endif
             break;
+
+        #endif
     }
 }
 
@@ -150,6 +179,23 @@ 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 = BUTTON_LED_PIN; // set as output
+            BUTTON_LED_PORT.OUTCLR = BUTTON_LED_PIN; // set output low
+            break;
+        case 1:  // LED low
+            BUTTON_LED_PORT.DIRCLR = BUTTON_LED_PIN; // set as input
+            BUTTON_LED_PORT.BUTTON_LED_CTRL = PORT_PULLUPEN_bm; // enable internal pull-up
+            break;
+        default:  // LED high
+            BUTTON_LED_PORT.DIRSET = BUTTON_LED_PIN; // set as output
+            BUTTON_LED_PORT.OUTSET = 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);
@@ -165,11 +211,16 @@ void button_led_set(uint8_t lvl) {
             BUTTON_LED_PUE  |= (1 << BUTTON_LED_PIN);
             BUTTON_LED_PORT |= (1 << BUTTON_LED_PIN);
             break;
+
+        #endif
     }
 }
 #endif
 
 #ifdef USE_AUX_RGB_LEDS
+#ifdef AVRXMEGA3  // ATTINY816, 817, etc
+#error Function rgb_led_set in fsm-misc is currently not set up for the AVR 1-Series
+#endif
 void rgb_led_set(uint8_t value) {
     // value: 0b00BBGGRR
     uint8_t pins[] = { AUXLED_R_PIN, AUXLED_G_PIN, AUXLED_B_PIN };
@@ -217,6 +268,9 @@ 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..7bb8acc 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 = RTC_PERIOD_CYC16384_gc | RTC_PITEN_bm; // Period = 0.5s, 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
 }
 
diff --git a/tk-attiny.h b/tk-attiny.h
index 49f1195..441f177 100644
--- a/tk-attiny.h
+++ b/tk-attiny.h
@@ -71,6 +71,12 @@
     #define DELAY_ZERO_TIME 1020
     //#define SWITCH_PORT  PINA  // set this in hwdef
     //#define VOLTAGE_ADC_DIDR DIDR0  // set this in hwdef
+#elif (ATTINY == 412) || (ATTINY == 416) || (ATTINY == 417) || (ATTINY == 816) || (ATTINY == 817) || (ATTINY == 1616) || (ATTINY == 1617) || (ATTINY == 3216) || (ATTINY == 3217)
+    #define AVRXMEGA3
+    #define F_CPU 5000000UL
+    #define BOGOMIPS (F_CPU/4000)
+    #define EEPSIZE 128
+    #define DELAY_ZERO_TIME 1020
 #else
     #error Hey, you need to define ATTINY.
 #endif
@@ -138,6 +144,28 @@
       clock_div_256 = 8
   } clock_div_t;
 
+#elif defined(AVRXMEGA3)  // ATTINY816, 817, etc
+    // this should work, but needs further validation
+    inline void clock_prescale_set(uint8_t n) {
+        cli();         
+        CCP = CCP_IOREG_gc; // temporarily disable clock change protection
+        CLKCTRL.MCLKCTRLB = n; // Set the prescaler
+        while (CLKCTRL.MCLKSTATUS & CLKCTRL_SOSC_bm) {} // wait for clock change to finish
+        sei();
+    }
+    typedef enum
+    {
+      // Actual clock is 20 MHz, but assume that 5 MHz is the top speed and work from there
+      clock_div_1 =   (CLKCTRL_PDIV_4X_gc  | CLKCTRL_PEN_bm), // 5 MHz
+      clock_div_2 =   (CLKCTRL_PDIV_8X_gc  | CLKCTRL_PEN_bm), // 2.5 MHz
+      clock_div_4 =   (CLKCTRL_PDIV_16X_gc | CLKCTRL_PEN_bm), // 1.25 MHz
+      clock_div_8 =   (CLKCTRL_PDIV_32X_gc | CLKCTRL_PEN_bm), // 625 kHz
+      clock_div_16 =  (CLKCTRL_PDIV_64X_gc | CLKCTRL_PEN_bm), // 312 kHz, max without changing to the 32 kHz ULP
+      clock_div_32 =  (CLKCTRL_PDIV_64X_gc | CLKCTRL_PEN_bm), // 312 kHz 
+      clock_div_64 =  (CLKCTRL_PDIV_64X_gc | CLKCTRL_PEN_bm), // 312 kHz 
+      clock_div_128 = (CLKCTRL_PDIV_64X_gc | CLKCTRL_PEN_bm), // 312 kHz 
+      clock_div_256 = (CLKCTRL_PDIV_64X_gc | CLKCTRL_PEN_bm)  // 312 kHz 
+    } clock_div_t;
 #else
 #error Unable to define MCU macros.
 #endif