reorganized project files (part 1)

(just moved files, didn't change the contents yet,
 and nothing will work without updating #includes and build scripts and stuff)

1 files changed, 1253 insertions, 0 deletions

diff --git a/ui/rampingios/rampingiosv3.c b/ui/rampingios/rampingiosv3.c
new file mode 100644
index 0000000..e990a5a
--- /dev/null
+++ b/ui/rampingios/rampingiosv3.c
@@ -0,0 +1,1253 @@
+/*
+ * RampingIOS V3: FSM-based version of RampingIOS V2 UI, with upgrades.
+ *
+ * Copyright (C) 2018-2019 Selene ToyKeeper
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/********* User-configurable options *********/
+// Anduril config file name (set it here or define it at the gcc command line)
+//#define CONFIGFILE cfg-emisar-d4s.h
+
+#define USE_LVP  // FIXME: won't build when this option is turned off
+
+// parameters for this defined below or per-driver
+#define USE_THERMAL_REGULATION
+#define DEFAULT_THERM_CEIL 45  // try not to get hotter than this
+#define USE_TENCLICK_THERMAL_CONFIG  // ten clicks from off -> thermal config mode
+
+// short blip when crossing from "click" to "hold" from off
+// (helps the user hit moon mode exactly, instead of holding too long
+//  or too short)
+#define MOON_TIMING_HINT
+// short blips while ramping
+#define BLINK_AT_RAMP_MIDDLE
+//#define BLINK_AT_RAMP_FLOOR
+#define BLINK_AT_RAMP_CEILING
+//#define BLINK_AT_STEPS  // whenever a discrete ramp mode is passed in smooth mode
+
+// ramp down via regular button hold if a ramp-up ended <1s ago
+// ("hold, release, hold" ramps down instead of up)
+#define USE_REVERSING
+
+// battery readout style (pick one)
+#define BATTCHECK_VpT
+//#define BATTCHECK_8bars  // FIXME: breaks build
+//#define BATTCHECK_4bars  // FIXME: breaks build
+
+// enable beacon mode
+#define USE_BEACON_MODE
+
+// make the ramps configurable by the user
+#define USE_RAMP_CONFIG
+
+/***** specific settings for known driver types *****/
+#include "tk.h"
+#include incfile(CONFIGFILE)
+
+
+// thermal properties, if not defined per-driver
+#ifndef MIN_THERM_STEPDOWN
+#define MIN_THERM_STEPDOWN MAX_1x7135  // lowest value it'll step down to
+#endif
+#ifndef THERM_FASTER_LEVEL
+    #ifdef MAX_Nx7135
+    #define THERM_FASTER_LEVEL MAX_Nx7135  // throttle back faster when high
+    #else
+    #define THERM_FASTER_LEVEL (RAMP_SIZE*4/5)  // throttle back faster when high
+    #endif
+#endif
+#ifdef USE_THERMAL_REGULATION
+#define USE_SET_LEVEL_GRADUALLY  // isn't used except for thermal adjustments
+#endif
+
+
+/********* Configure SpaghettiMonster *********/
+#define USE_DELAY_ZERO
+#define USE_RAMPING
+#ifndef RAMP_LENGTH
+#define RAMP_LENGTH 150  // default, if not overridden in a driver cfg file
+#endif
+#define USE_BATTCHECK
+#define USE_IDLE_MODE  // reduce power use while awake and no tasks are pending
+#define USE_DYNAMIC_UNDERCLOCKING  // cut clock speed at very low modes for better efficiency
+
+// try to auto-detect how many eeprom bytes
+#define USE_EEPROM
+#define EEPROM_BYTES_BASE 7
+
+#ifdef USE_INDICATOR_LED
+#define EEPROM_INDICATOR_BYTES 1
+#else
+#define EEPROM_INDICATOR_BYTES 0
+#endif
+
+#ifdef USE_THERMAL_REGULATION
+#define EEPROM_THERMAL_BYTES 2
+#else
+#define EEPROM_THERMAL_BYTES 0
+#endif
+
+#define EEPROM_BYTES (EEPROM_BYTES_BASE+EEPROM_INDICATOR_BYTES+EEPROM_THERMAL_BYTES)
+
+
+#include "spaghetti-monster.h"
+
+
+// FSM states
+uint8_t off_state(Event event, uint16_t arg);
+// simple numeric entry config menu
+uint8_t config_state_base(Event event, uint16_t arg,
+                          uint8_t num_config_steps,
+                          void (*savefunc)());
+#define MAX_CONFIG_VALUES 3
+uint8_t config_state_values[MAX_CONFIG_VALUES];
+// ramping mode and its related config mode
+uint8_t steady_state(Event event, uint16_t arg);
+#ifdef USE_RAMP_CONFIG
+uint8_t ramp_config_state(Event event, uint16_t arg);
+#endif
+#ifdef USE_BATTCHECK
+uint8_t battcheck_state(Event event, uint16_t arg);
+#endif
+#ifdef USE_THERMAL_REGULATION
+#define USE_BLINK_NUM
+uint8_t tempcheck_state(Event event, uint16_t arg);
+uint8_t thermal_config_state(Event event, uint16_t arg);
+#endif
+#ifdef USE_BEACON_MODE
+// beacon mode and its related config mode
+uint8_t beacon_state(Event event, uint16_t arg);
+uint8_t beacon_config_state(Event event, uint16_t arg);
+#endif
+// soft lockout
+#define MOON_DURING_LOCKOUT_MODE
+// if enabled, 2nd lockout click goes to the other ramp's floor level
+//#define LOCKOUT_MOON_FANCY
+uint8_t lockout_state(Event event, uint16_t arg);
+// momentary / signalling mode
+uint8_t momentary_state(Event event, uint16_t arg);
+
+// general helper function for config modes
+uint8_t number_entry_state(Event event, uint16_t arg);
+// return value from number_entry_state()
+volatile uint8_t number_entry_value;
+
+void blink_confirm(uint8_t num);
+#if defined(USE_INDICATOR_LED) && defined(TICK_DURING_STANDBY)
+void indicator_blink(uint8_t arg);
+#endif
+
+// remember stuff even after battery was changed
+void load_config();
+void save_config();
+
+// default ramp options if not overridden earlier per-driver
+#ifndef RAMP_SMOOTH_FLOOR
+  #define RAMP_SMOOTH_FLOOR 1
+#endif
+#ifndef RAMP_SMOOTH_CEIL
+  #if PWM_CHANNELS == 3
+    #define RAMP_SMOOTH_CEIL MAX_Nx7135
+  #else
+    #define RAMP_SMOOTH_CEIL MAX_LEVEL - 30
+  #endif
+#endif
+#ifndef RAMP_DISCRETE_FLOOR
+  #define RAMP_DISCRETE_FLOOR 20
+#endif
+#ifndef RAMP_DISCRETE_CEIL
+  #define RAMP_DISCRETE_CEIL RAMP_SMOOTH_CEIL
+#endif
+#ifndef RAMP_DISCRETE_STEPS
+  #define RAMP_DISCRETE_STEPS 7
+#endif
+
+// mile marker(s) partway up the ramp
+// default: blink only at border between regulated and FET
+#ifdef BLINK_AT_RAMP_MIDDLE
+  #if PWM_CHANNELS >= 3
+    #ifndef BLINK_AT_RAMP_MIDDLE_1
+      #define BLINK_AT_RAMP_MIDDLE_1 MAX_Nx7135
+      #ifndef BLINK_AT_RAMP_MIDDLE_2
+      #define BLINK_AT_RAMP_MIDDLE_2 MAX_1x7135
+      #endif
+    #endif
+  #else
+    #ifndef BLINK_AT_RAMP_MIDDLE_1
+    #define BLINK_AT_RAMP_MIDDLE_1 MAX_1x7135
+    #endif
+  #endif
+#endif
+
+// brightness control
+#ifndef DEFAULT_LEVEL
+#define DEFAULT_LEVEL MAX_1x7135
+#endif
+uint8_t memorized_level = DEFAULT_LEVEL;
+// smooth vs discrete ramping
+volatile uint8_t ramp_style = 0;  // 0 = smooth, 1 = discrete
+volatile uint8_t ramp_smooth_floor = RAMP_SMOOTH_FLOOR;
+volatile uint8_t ramp_smooth_ceil = RAMP_SMOOTH_CEIL;
+volatile uint8_t ramp_discrete_floor = RAMP_DISCRETE_FLOOR;
+volatile uint8_t ramp_discrete_ceil = RAMP_DISCRETE_CEIL;
+volatile uint8_t ramp_discrete_steps = RAMP_DISCRETE_STEPS;
+uint8_t ramp_discrete_step_size;  // don't set this
+
+#ifdef USE_INDICATOR_LED
+    // bits 2-3 control lockout mode
+    // bits 0-1 control "off" mode
+    // modes are: 0=off, 1=low, 2=high, 3=blinking (if TICK_DURING_STANDBY enabled)
+    #ifdef INDICATOR_LED_DEFAULT_MODE
+    uint8_t indicator_led_mode = INDICATOR_LED_DEFAULT_MODE;
+    #else
+        #ifdef USE_INDICATOR_LED_WHILE_RAMPING
+        //uint8_t indicator_led_mode = (1<<2) + 2;
+        uint8_t indicator_led_mode = (2<<2) + 1;
+        #else
+        uint8_t indicator_led_mode = (3<<2) + 1;
+        #endif
+    #endif
+#endif
+
+// calculate the nearest ramp level which would be valid at the moment
+// (is a no-op for smooth ramp, but limits discrete ramp to only the
+// correct levels for the user's config)
+uint8_t nearest_level(int16_t target);
+
+#ifdef USE_THERMAL_REGULATION
+// brightness before thermal step-down
+uint8_t target_level = 0;
+#endif
+
+#ifdef USE_BEACON_MODE
+// beacon timing
+volatile uint8_t beacon_seconds = 2;
+#endif
+
+
+uint8_t off_state(Event event, uint16_t arg) {
+    // turn emitter off when entering state
+    if (event == EV_enter_state) {
+        set_level(0);
+        #ifdef USE_INDICATOR_LED
+        indicator_led(indicator_led_mode & 0x03);
+        #endif
+        // sleep while off  (lower power use)
+        go_to_standby = 1;
+        return EVENT_HANDLED;
+    }
+    // go back to sleep eventually if we got bumped but didn't leave "off" state
+    else if (event == EV_tick) {
+        if (arg > TICKS_PER_SECOND*2) {
+            go_to_standby = 1;
+            #ifdef USE_INDICATOR_LED
+            indicator_led(indicator_led_mode & 0x03);
+            #endif
+        }
+        return EVENT_HANDLED;
+    }
+    #if defined(TICK_DURING_STANDBY) && defined(USE_INDICATOR_LED)
+    // blink the indicator LED, maybe
+    else if (event == EV_sleep_tick) {
+        if ((indicator_led_mode & 0b00000011) == 0b00000011) {
+            indicator_blink(arg);
+        }
+        return EVENT_HANDLED;
+    }
+    #endif
+    // hold (initially): go to lowest level (floor), but allow abort for regular click
+    else if (event == EV_click1_press) {
+        set_level(nearest_level(1));
+        return EVENT_HANDLED;
+    }
+    // hold: go to lowest level
+    else if (event == EV_click1_hold) {
+        #ifdef MOON_TIMING_HINT
+        if (arg == 0) {
+            // let the user know they can let go now to stay at moon
+            uint8_t temp = actual_level;
+            set_level(0);
+            delay_4ms(3);
+            set_level(temp);
+        } else
+        #endif
+        // don't start ramping immediately;
+        // give the user time to release at moon level
+        //if (arg >= HOLD_TIMEOUT) {  // smaller
+        if (arg >= (!ramp_style) * HOLD_TIMEOUT) {  // more consistent
+            set_state(steady_state, 1);
+        }
+        return EVENT_HANDLED;
+    }
+    // hold, release quickly: go to lowest level (floor)
+    else if (event == EV_click1_hold_release) {
+        set_state(steady_state, 1);
+        return EVENT_HANDLED;
+    }
+    // 1 click (before timeout): go to memorized level, but allow abort for double click
+    else if (event == EV_click1_release) {
+        set_level(nearest_level(memorized_level));
+        return EVENT_HANDLED;
+    }
+    // 1 click: regular mode
+    else if (event == EV_1click) {
+        set_state(steady_state, memorized_level);
+        return EVENT_HANDLED;
+    }
+    // click, hold: go to highest level (ceiling) (for ramping down)
+    else if (event == EV_click2_hold) {
+        set_state(steady_state, MAX_LEVEL);
+        return EVENT_HANDLED;
+    }
+    // 2 clicks: highest mode (ceiling)
+    else if (event == EV_2clicks) {
+        set_state(steady_state, MAX_LEVEL);
+        return EVENT_HANDLED;
+    }
+    // 3 clicks (initial press): off, to prep for later events
+    else if (event == EV_click3_press) {
+        set_level(0);
+        return EVENT_HANDLED;
+    }
+    #ifdef USE_BATTCHECK
+    // 3 clicks: battcheck mode / blinky mode group 1
+    else if (event == EV_3clicks) {
+        set_state(battcheck_state, 0);
+        return EVENT_HANDLED;
+    }
+    #endif
+    // 4 clicks: momentary
+    else if (event == EV_4clicks) {
+        blink_confirm(1);
+        set_state(momentary_state, 0);
+        return EVENT_HANDLED;
+    }
+    // 6 clicks: lockout mode
+    else if (event == EV_6clicks) {
+        blink_confirm(2);
+        set_state(lockout_state, 0);
+        return EVENT_HANDLED;
+    }
+    #ifdef USE_INDICATOR_LED
+    // 7 clicks: next aux LED mode
+    else if (event == EV_7clicks) {
+        blink_confirm(1);
+        uint8_t mode = (indicator_led_mode & 3) + 1;
+        #ifdef TICK_DURING_STANDBY
+        mode = mode & 3;
+        #else
+        mode = mode % 3;
+        #endif
+        #ifdef INDICATOR_LED_SKIP_LOW
+        if (mode == 1) { mode ++; }
+        #endif
+        indicator_led_mode = (indicator_led_mode & 0b11111100) | mode;
+        indicator_led(mode);
+        save_config();
+        return EVENT_HANDLED;
+    }
+    #endif
+    // 8 clicks: beacon mode
+    else if (event == EV_8clicks) {
+        set_state(beacon_state, 0);
+        return EVENT_HANDLED;
+    }
+    #ifdef USE_TENCLICK_THERMAL_CONFIG
+    // 10 clicks: thermal config mode
+    else if (event == EV_10clicks) {
+        push_state(thermal_config_state, 0);
+        return EVENT_HANDLED;
+    }
+    #endif
+    return EVENT_NOT_HANDLED;
+}
+
+
+uint8_t steady_state(Event event, uint16_t arg) {
+    uint8_t mode_min = ramp_smooth_floor;
+    uint8_t mode_max = ramp_smooth_ceil;
+    uint8_t ramp_step_size = 1;
+    #ifdef USE_REVERSING
+    static int8_t ramp_direction = 1;
+    #endif
+    if (ramp_style) {
+        mode_min = ramp_discrete_floor;
+        mode_max = ramp_discrete_ceil;
+        ramp_step_size = ramp_discrete_step_size;
+    }
+
+    // turn LED on when we first enter the mode
+    if ((event == EV_enter_state) || (event == EV_reenter_state)) {
+        // if we just got back from config mode, go back to memorized level
+        if (event == EV_reenter_state) {
+            arg = memorized_level;
+        }
+        // remember this level, unless it's moon or turbo
+        if ((arg > mode_min) && (arg < mode_max))
+            memorized_level = arg;
+        // use the requested level even if not memorized
+        arg = nearest_level(arg);
+        #ifdef USE_THERMAL_REGULATION
+        target_level = arg;
+        #endif
+        set_level(arg);
+        #ifdef USE_REVERSING
+        ramp_direction = 1;
+        #endif
+        return EVENT_HANDLED;
+    }
+    // 1 click: off
+    else if (event == EV_1click) {
+        set_state(off_state, 0);
+        return EVENT_HANDLED;
+    }
+    // 2 clicks: go to/from highest level
+    else if (event == EV_2clicks) {
+        if (actual_level < MAX_LEVEL) {
+            #ifdef USE_THERMAL_REGULATION
+            target_level = MAX_LEVEL;
+            #endif
+            // true turbo, not the mode-specific ceiling
+            set_level(MAX_LEVEL);
+        }
+        else {
+            #ifdef USE_THERMAL_REGULATION
+            target_level = memorized_level;
+            #endif
+            set_level(memorized_level);
+        }
+        return EVENT_HANDLED;
+    }
+    // 3 clicks: toggle smooth vs discrete ramping
+    else if (event == EV_3clicks) {
+        ramp_style = !ramp_style;
+        memorized_level = nearest_level(actual_level);
+        #ifdef USE_THERMAL_REGULATION
+        target_level = memorized_level;
+        #ifdef USE_SET_LEVEL_GRADUALLY
+        //set_level_gradually(lvl);
+        #endif
+        #endif
+        save_config();
+        set_level(0);
+        delay_4ms(20/4);
+        set_level(memorized_level);
+        return EVENT_HANDLED;
+    }
+    #ifdef USE_RAMP_CONFIG
+    // 4 clicks: configure this ramp mode
+    else if (event == EV_4clicks) {
+        push_state(ramp_config_state, 0);
+        return EVENT_HANDLED;
+    }
+    #endif
+    // hold: change brightness (brighter)
+    else if (event == EV_click1_hold) {
+        // ramp slower in discrete mode
+        if (ramp_style  &&  (arg % HOLD_TIMEOUT != 0)) {
+            return EVENT_HANDLED;
+        }
+        #ifdef USE_REVERSING
+        // make it ramp down instead, if already at max
+        if ((arg <= 1) && (actual_level >= mode_max)) {
+            ramp_direction = -1;
+        }
+        memorized_level = nearest_level((int16_t)actual_level \
+                          + (ramp_step_size * ramp_direction));
+        #else
+        memorized_level = nearest_level((int16_t)actual_level + ramp_step_size);
+        #endif
+        #ifdef USE_THERMAL_REGULATION
+        target_level = memorized_level;
+        #endif
+        #if defined(BLINK_AT_RAMP_CEILING) || defined(BLINK_AT_RAMP_MIDDLE)
+        // only blink once for each threshold
+        if ((memorized_level != actual_level) && (
+                0  // for easier syntax below
+                #ifdef BLINK_AT_RAMP_MIDDLE_1
+                || (memorized_level == BLINK_AT_RAMP_MIDDLE_1)
+                #endif
+                #ifdef BLINK_AT_RAMP_MIDDLE_2
+                || (memorized_level == BLINK_AT_RAMP_MIDDLE_2)
+                #endif
+                #ifdef BLINK_AT_RAMP_CEILING
+                || (memorized_level == mode_max)
+                #endif
+                #if defined(USE_REVERSING) && defined(BLINK_AT_RAMP_FLOOR)
+                || (memorized_level == mode_min)
+                #endif
+                )) {
+            set_level(0);
+            delay_4ms(8/4);
+        }
+        #endif
+        #if defined(BLINK_AT_STEPS)
+        uint8_t foo = ramp_style;
+        ramp_style = 1;
+        uint8_t nearest = nearest_level((int16_t)actual_level);
+        ramp_style = foo;
+        // only blink once for each threshold
+        if ((memorized_level != actual_level) &&
+                    (ramp_style == 0) &&
+                    (memorized_level == nearest)
+                    )
+        {
+            set_level(0);
+            delay_4ms(8/4);
+        }
+        #endif
+        set_level(memorized_level);
+        return EVENT_HANDLED;
+    }
+    #if defined(USE_REVERSING)
+    // reverse ramp direction on hold release
+    else if (event == EV_click1_hold_release) {
+        #ifdef USE_REVERSING
+        ramp_direction = -ramp_direction;
+        #endif
+        return EVENT_HANDLED;
+    }
+    #endif
+    // click, hold: change brightness (dimmer)
+    else if (event == EV_click2_hold) {
+        #ifdef USE_REVERSING
+        ramp_direction = 1;
+        #endif
+        // ramp slower in discrete mode
+        if (ramp_style  &&  (arg % HOLD_TIMEOUT != 0)) {
+            return EVENT_HANDLED;
+        }
+        // TODO? make it ramp up instead, if already at min?
+        memorized_level = nearest_level((int16_t)actual_level - ramp_step_size);
+        #ifdef USE_THERMAL_REGULATION
+        target_level = memorized_level;
+        #endif
+        #if defined(BLINK_AT_RAMP_FLOOR) || defined(BLINK_AT_RAMP_MIDDLE)
+        // only blink once for each threshold
+        if ((memorized_level != actual_level) && (
+                0  // for easier syntax below
+                #ifdef BLINK_AT_RAMP_MIDDLE_1
+                || (memorized_level == BLINK_AT_RAMP_MIDDLE_1)
+                #endif
+                #ifdef BLINK_AT_RAMP_MIDDLE_2
+                || (memorized_level == BLINK_AT_RAMP_MIDDLE_2)
+                #endif
+                #ifdef BLINK_AT_RAMP_FLOOR
+                || (memorized_level == mode_min)
+                #endif
+                )) {
+            set_level(0);
+            delay_4ms(8/4);
+        }
+        #endif
+        #if defined(BLINK_AT_STEPS)
+        uint8_t foo = ramp_style;
+        ramp_style = 1;
+        uint8_t nearest = nearest_level((int16_t)actual_level);
+        ramp_style = foo;
+        // only blink once for each threshold
+        if ((memorized_level != actual_level) &&
+                    (ramp_style == 0) &&
+                    (memorized_level == nearest)
+                    )
+        {
+            set_level(0);
+            delay_4ms(8/4);
+        }
+        #endif
+        set_level(memorized_level);
+        return EVENT_HANDLED;
+    }
+    #if defined(USE_SET_LEVEL_GRADUALLY) || defined(USE_REVERSING)
+    else if (event == EV_tick) {
+        #ifdef USE_REVERSING
+        // un-reverse after 1 second
+        if (arg == TICKS_PER_SECOND) ramp_direction = 1;
+        #endif
+        #ifdef USE_SET_LEVEL_GRADUALLY
+        // make thermal adjustment speed scale with magnitude
+        if ((arg & 1) && (actual_level < THERM_FASTER_LEVEL)) {
+            return EVENT_HANDLED;  // adjust slower when not a high mode
+        }
+        #ifdef THERM_HARD_TURBO_DROP
+        else if ((! (actual_level < THERM_FASTER_LEVEL))
+                && (actual_level > gradual_target)) {
+            gradual_tick();
+        }
+        else {
+        #endif
+        // [int(62*4 / (x**0.8)) for x in (1,2,4,8,16,32,64,128)]
+        //uint8_t intervals[] = {248, 142, 81, 46, 26, 15, 8, 5};
+        // [int(62*4 / (x**0.9)) for x in (1,2,4,8,16,32,64,128)]
+        //uint8_t intervals[] = {248, 132, 71, 38, 20, 10, 5, 3};
+        // [int(62*4 / (x**0.95)) for x in (1,2,4,8,16,32,64,128)]
+        uint8_t intervals[] = {248, 128, 66, 34, 17, 9, 4, 2};
+        uint8_t diff;
+        static uint8_t ticks_since_adjust = 0;
+        ticks_since_adjust ++;
+        if (gradual_target > actual_level) diff = gradual_target - actual_level;
+        else {
+            diff = actual_level - gradual_target;
+        }
+        uint8_t magnitude = 0;
+        #ifndef THERM_HARD_TURBO_DROP
+        // if we're on a really high mode, drop faster
+        if (actual_level >= THERM_FASTER_LEVEL) { magnitude ++; }
+        #endif
+        while (diff) {
+            magnitude ++;
+            diff >>= 1;
+        }
+        uint8_t ticks_per_adjust = intervals[magnitude];
+        if (ticks_since_adjust > ticks_per_adjust)
+        {
+            gradual_tick();
+            ticks_since_adjust = 0;
+        }
+        //if (!(arg % ticks_per_adjust)) gradual_tick();
+        #ifdef THERM_HARD_TURBO_DROP
+        }
+        #endif
+        #endif
+        return EVENT_HANDLED;
+    }
+    #endif
+    #ifdef USE_THERMAL_REGULATION
+    // overheating: drop by an amount proportional to how far we are above the ceiling
+    else if (event == EV_temperature_high) {
+        #if 0
+        uint8_t foo = actual_level;
+        set_level(0);
+        delay_4ms(2);
+        set_level(foo);
+        #endif
+        #ifdef THERM_HARD_TURBO_DROP
+        if (actual_level > THERM_FASTER_LEVEL) {
+            #ifdef USE_SET_LEVEL_GRADUALLY
+            set_level_gradually(THERM_FASTER_LEVEL);
+            #else
+            set_level(THERM_FASTER_LEVEL);
+            #endif
+            target_level = THERM_FASTER_LEVEL;
+        } else
+        #endif
+        if (actual_level > MIN_THERM_STEPDOWN) {
+            int16_t stepdown = actual_level - arg;
+            if (stepdown < MIN_THERM_STEPDOWN) stepdown = MIN_THERM_STEPDOWN;
+            else if (stepdown > MAX_LEVEL) stepdown = MAX_LEVEL;
+            #ifdef USE_SET_LEVEL_GRADUALLY
+            set_level_gradually(stepdown);
+            #else
+            set_level(stepdown);
+            #endif
+        }
+        return EVENT_HANDLED;
+    }
+    // underheating: increase slowly if we're lower than the target
+    //               (proportional to how low we are)
+    else if (event == EV_temperature_low) {
+        #if 0
+        uint8_t foo = actual_level;
+        set_level(0);
+        delay_4ms(2);
+        set_level(foo);
+        #endif
+        if (actual_level < target_level) {
+            //int16_t stepup = actual_level + (arg>>1);
+            int16_t stepup = actual_level + arg;
+            if (stepup > target_level) stepup = target_level;
+            else if (stepup < MIN_THERM_STEPDOWN) stepup = MIN_THERM_STEPDOWN;
+            #ifdef USE_SET_LEVEL_GRADUALLY
+            set_level_gradually(stepup);
+            #else
+            set_level(stepup);
+            #endif
+        }
+        return EVENT_HANDLED;
+    }
+    #endif
+    return EVENT_NOT_HANDLED;
+}
+
+
+#ifdef USE_BATTCHECK
+uint8_t battcheck_state(Event event, uint16_t arg) {
+    // 1 click: off
+    if (event == EV_1click) {
+        set_state(off_state, 0);
+        return EVENT_HANDLED;
+    }
+    // 2 clicks: tempcheck mode
+    else if (event == EV_2clicks) {
+        set_state(tempcheck_state, 0);
+        return EVENT_HANDLED;
+    }
+    return EVENT_NOT_HANDLED;
+}
+#endif
+
+
+#ifdef USE_THERMAL_REGULATION
+uint8_t tempcheck_state(Event event, uint16_t arg) {
+    // 1 click: off
+    if (event == EV_1click) {
+        set_state(off_state, 0);
+        return EVENT_HANDLED;
+    }
+    // 4 clicks: thermal config mode
+    else if (event == EV_4clicks) {
+        push_state(thermal_config_state, 0);
+        return EVENT_HANDLED;
+    }
+    return EVENT_NOT_HANDLED;
+}
+#endif
+
+
+#ifdef USE_BEACON_MODE
+uint8_t beacon_state(Event event, uint16_t arg) {
+    // 1 click: off
+    if (event == EV_1click) {
+        set_state(off_state, 0);
+        return EVENT_HANDLED;
+    }
+    // TODO: use sleep ticks to measure time between pulses,
+    //       to save power
+    // 4 clicks: beacon config mode
+    else if (event == EV_4clicks) {
+        push_state(beacon_config_state, 0);
+        return EVENT_HANDLED;
+    }
+    return EVENT_NOT_HANDLED;
+}
+#endif  // #ifdef USE_BEACON_MODE
+
+
+uint8_t lockout_state(Event event, uint16_t arg) {
+    #ifdef MOON_DURING_LOCKOUT_MODE
+    // momentary(ish) moon mode during lockout
+    // button is being held
+    if ((event & (B_CLICK | B_PRESS)) == (B_CLICK | B_PRESS)) {
+        #ifdef LOCKOUT_MOON_LOWEST
+        // Use lowest moon configured
+        uint8_t lvl = ramp_smooth_floor;
+        if (ramp_discrete_floor < lvl) lvl = ramp_discrete_floor;
+        set_level(lvl);
+        #elif defined(LOCKOUT_MOON_FANCY)
+        uint8_t levels[] = { ramp_smooth_floor, ramp_discrete_floor };
+        if ((event & 0x0f) == 2) {
+            set_level(levels[ramp_style^1]);
+        } else {
+            set_level(levels[ramp_style]);
+        }
+        #else
+        // Use moon from current ramp
+        set_level(nearest_level(1));
+        #endif
+    }
+    // button was released
+    else if ((event & (B_CLICK | B_PRESS)) == (B_CLICK)) {
+        set_level(0);
+    }
+    #endif
+
+    // regular event handling
+    // conserve power while locked out
+    // (allow staying awake long enough to exit, but otherwise
+    //  be persistent about going back to sleep every few seconds
+    //  even if the user keeps pressing the button)
+    #ifdef USE_INDICATOR_LED
+    if (event == EV_enter_state) {
+        indicator_led(indicator_led_mode >> 2);
+    } else
+    #endif
+    if (event == EV_tick) {
+        if (arg > TICKS_PER_SECOND*2) {
+            go_to_standby = 1;
+            #ifdef USE_INDICATOR_LED
+            indicator_led(indicator_led_mode >> 2);
+            #endif
+        }
+        return EVENT_HANDLED;
+    }
+    #if defined(TICK_DURING_STANDBY) && defined(USE_INDICATOR_LED)
+    else if (event == EV_sleep_tick) {
+        if ((indicator_led_mode & 0b00001100) == 0b00001100) {
+            indicator_blink(arg);
+        }
+        return EVENT_HANDLED;
+    }
+    #endif
+    #ifdef USE_INDICATOR_LED
+    // 3 clicks: rotate through indicator LED modes (lockout mode)
+    else if (event == EV_3clicks) {
+        uint8_t mode = indicator_led_mode >> 2;
+        #ifdef TICK_DURING_STANDBY
+        mode = (mode + 1) & 3;
+        #else
+        mode = (mode + 1) % 3;
+        #endif
+        #ifdef INDICATOR_LED_SKIP_LOW
+        if (mode == 1) { mode ++; }
+        #endif
+        indicator_led_mode = (mode << 2) + (indicator_led_mode & 0x03);
+        indicator_led(mode);
+        save_config();
+        return EVENT_HANDLED;
+    }
+    #endif
+    // 6 clicks: exit
+    else if (event == EV_6clicks) {
+        blink_confirm(1);
+        set_state(off_state, 0);
+        return EVENT_HANDLED;
+    }
+
+    return EVENT_NOT_HANDLED;
+}
+
+
+uint8_t momentary_state(Event event, uint16_t arg) {
+    // TODO: momentary strobe here?  (for light painting)
+
+    // light up when the button is pressed; go dark otherwise
+    // button is being held
+    if ((event & (B_CLICK | B_PRESS)) == (B_CLICK | B_PRESS)) {
+        set_level(memorized_level);
+        return EVENT_HANDLED;
+    }
+    // button was released
+    else if ((event & (B_CLICK | B_PRESS)) == (B_CLICK)) {
+        set_level(0);
+        //go_to_standby = 1;  // sleep while light is off
+        return EVENT_HANDLED;
+    }
+
+    // Sleep, dammit!  (but wait a few seconds first)
+    // (because standby mode uses such little power that it can interfere
+    //  with exiting via tailcap loosen+tighten unless you leave power
+    //  disconnected for several seconds, so we want to be awake when that
+    //  happens to speed up the process)
+    else if ((event == EV_tick)  &&  (actual_level == 0)) {
+        if (arg > TICKS_PER_SECOND*15) {  // sleep after 15 seconds
+            go_to_standby = 1;  // sleep while light is off
+            // TODO: lighted button should use lockout config?
+        }
+        return EVENT_HANDLED;
+    }
+
+    return EVENT_NOT_HANDLED;
+}
+
+
+// ask the user for a sequence of numbers, then save them and return to caller
+uint8_t config_state_base(Event event, uint16_t arg,
+                          uint8_t num_config_steps,
+                          void (*savefunc)()) {
+    static uint8_t config_step;
+    if (event == EV_enter_state) {
+        config_step = 0;
+        set_level(0);
+        return EVENT_HANDLED;
+    }
+    // advance forward through config steps
+    else if (event == EV_tick) {
+        if (config_step < num_config_steps) {
+            push_state(number_entry_state, config_step + 1);
+        }
+        else {
+            // TODO: blink out some sort of success pattern
+            savefunc();
+            save_config();
+            //set_state(retstate, retval);
+            pop_state();
+        }
+        return EVENT_HANDLED;
+    }
+    // an option was set (return from number_entry_state)
+    else if (event == EV_reenter_state) {
+        config_state_values[config_step] = number_entry_value;
+        config_step ++;
+        return EVENT_HANDLED;
+    }
+    //return EVENT_NOT_HANDLED;
+    // eat all other events; don't pass any through to parent
+    return EVENT_HANDLED;
+}
+
+#ifdef USE_RAMP_CONFIG
+void ramp_config_save() {
+    // parse values
+    uint8_t val;
+    if (ramp_style) {  // discrete / stepped ramp
+
+        val = config_state_values[0];
+        if (val) { ramp_discrete_floor = val; }
+
+        val = config_state_values[1];
+        if (val) { ramp_discrete_ceil = MAX_LEVEL + 1 - val; }
+
+        val = config_state_values[2];
+        if (val) ramp_discrete_steps = val;
+
+    } else {  // smooth ramp
+
+        val = config_state_values[0];
+        if (val) { ramp_smooth_floor = val; }
+
+        val = config_state_values[1];
+        if (val) { ramp_smooth_ceil = MAX_LEVEL + 1 - val; }
+
+    }
+}
+
+uint8_t ramp_config_state(Event event, uint16_t arg) {
+    uint8_t num_config_steps;
+    num_config_steps = 2 + ramp_style;
+    return config_state_base(event, arg,
+                             num_config_steps, ramp_config_save);
+}
+#endif  // #ifdef USE_RAMP_CONFIG
+
+
+#ifdef USE_THERMAL_REGULATION
+void thermal_config_save() {
+    // parse values
+    uint8_t val;
+
+    // calibrate room temperature
+    val = config_state_values[0];
+    if (val) {
+        int8_t rawtemp = temperature - therm_cal_offset;
+        therm_cal_offset = val - rawtemp;
+        reset_thermal_history = 1;  // invalidate all recent temperature data
+    }
+
+    val = config_state_values[1];
+    if (val) {
+        // set maximum heat limit
+        therm_ceil = 30 + val - 1;
+    }
+    if (therm_ceil > MAX_THERM_CEIL) therm_ceil = MAX_THERM_CEIL;
+}
+
+uint8_t thermal_config_state(Event event, uint16_t arg) {
+    return config_state_base(event, arg,
+                             2, thermal_config_save);
+}
+#endif  // #ifdef USE_THERMAL_REGULATION
+
+
+#ifdef USE_BEACON_MODE
+void beacon_config_save() {
+    // parse values
+    uint8_t val = config_state_values[0];
+    if (val) {
+        beacon_seconds = val;
+    }
+}
+
+uint8_t beacon_config_state(Event event, uint16_t arg) {
+    return config_state_base(event, arg,
+                             1, beacon_config_save);
+}
+
+inline void beacon_mode_iter() {
+    // one iteration of main loop()
+    set_level(memorized_level);
+    nice_delay_ms(100);
+    set_level(0);
+    nice_delay_ms(((beacon_seconds) * 1000) - 100);
+}
+#endif  // #ifdef USE_BEACON_MODE
+
+
+uint8_t number_entry_state(Event event, uint16_t arg) {
+    static uint8_t value;
+    static uint8_t blinks_left;
+    static uint8_t entry_step;
+    static uint16_t wait_ticks;
+    if (event == EV_enter_state) {
+        value = 0;
+        blinks_left = arg;
+        entry_step = 0;
+        wait_ticks = 0;
+        return EVENT_HANDLED;
+    }
+    // advance through the process:
+    // 0: wait a moment
+    // 1: blink out the 'arg' value
+    // 2: wait a moment
+    // 3: "buzz" while counting clicks
+    // 4: save and exit
+    else if (event == EV_tick) {
+        // wait a moment
+        if ((entry_step == 0) || (entry_step == 2)) {
+            if (wait_ticks < TICKS_PER_SECOND/2)
+                wait_ticks ++;
+            else {
+                entry_step ++;
+                wait_ticks = 0;
+            }
+        }
+        // blink out the option number
+        else if (entry_step == 1) {
+            if (blinks_left) {
+                if ((wait_ticks & 31) == 10) {
+                    set_level(RAMP_SIZE/4);
+                }
+                else if ((wait_ticks & 31) == 20) {
+                    set_level(0);
+                }
+                else if ((wait_ticks & 31) == 31) {
+                    blinks_left --;
+                }
+                wait_ticks ++;
+            }
+            else {
+                entry_step ++;
+                wait_ticks = 0;
+            }
+        }
+        else if (entry_step == 3) {  // buzz while waiting for a number to be entered
+            wait_ticks ++;
+            // buzz for N seconds after last event
+            if ((wait_ticks & 3) == 0) {
+                set_level(RAMP_SIZE/6);
+            }
+            else if ((wait_ticks & 3) == 2) {
+                set_level(RAMP_SIZE/8);
+            }
+            // time out after 3 seconds
+            if (wait_ticks > TICKS_PER_SECOND*3) {
+                //number_entry_value = value;
+                set_level(0);
+                entry_step ++;
+            }
+        }
+        else if (entry_step == 4) {
+            number_entry_value = value;
+            pop_state();
+        }
+        return EVENT_HANDLED;
+    }
+    // count clicks
+    else if (event == EV_click1_release) {
+        empty_event_sequence();
+        if (entry_step == 3) {  // only count during the "buzz"
+            value ++;
+            wait_ticks = 0;
+            // flash briefly
+            set_level(RAMP_SIZE/2);
+            delay_4ms(8/2);
+            set_level(0);
+        }
+        return EVENT_HANDLED;
+    }
+    return EVENT_NOT_HANDLED;
+}
+
+
+// find the ramp level closest to the target,
+// using only the levels which are allowed in the current state
+uint8_t nearest_level(int16_t target) {
+    // bounds check
+    // using int16_t here saves us a bunch of logic elsewhere,
+    // by allowing us to correct for numbers < 0 or > 255 in one central place
+    uint8_t mode_min = ramp_smooth_floor;
+    uint8_t mode_max = ramp_smooth_ceil;
+    if (ramp_style) {
+        mode_min = ramp_discrete_floor;
+        mode_max = ramp_discrete_ceil;
+    }
+    if (target < mode_min) return mode_min;
+    if (target > mode_max) return mode_max;
+    // the rest isn't relevant for smooth ramping
+    if (! ramp_style) return target;
+
+    uint8_t ramp_range = ramp_discrete_ceil - ramp_discrete_floor;
+    ramp_discrete_step_size = ramp_range / (ramp_discrete_steps-1);
+    uint8_t this_level = ramp_discrete_floor;
+
+    for(uint8_t i=0; i<ramp_discrete_steps; i++) {
+        this_level = ramp_discrete_floor + (i * (uint16_t)ramp_range / (ramp_discrete_steps-1));
+        int16_t diff = target - this_level;
+        if (diff < 0) diff = -diff;
+        if (diff <= (ramp_discrete_step_size>>1))
+            return this_level;
+    }
+    return this_level;
+}
+
+
+void blink_confirm(uint8_t num) {
+    for (; num>0; num--) {
+        set_level(MAX_LEVEL/4);
+        delay_4ms(10/4);
+        set_level(0);
+        delay_4ms(100/4);
+    }
+}
+
+
+#if defined(USE_INDICATOR_LED) && defined(TICK_DURING_STANDBY)
+// beacon-like mode for the indicator LED
+void indicator_blink(uint8_t arg) {
+    #define USE_FANCIER_BLINKING_INDICATOR
+    #ifdef USE_FANCIER_BLINKING_INDICATOR
+
+    // fancy blink, set off/low/high levels here:
+    uint8_t seq[] = {0, 1, 2, 1,  0, 0, 0, 0,
+                     0, 0, 1, 0,  0, 0, 0, 0};
+    indicator_led(seq[arg & 15]);
+
+    #else  // basic blink, 1/8th duty cycle
+
+    if (! (arg & 7)) {
+        indicator_led(2);
+    }
+    else {
+        indicator_led(0);
+    }
+
+    #endif
+}
+#endif
+
+
+void load_config() {
+    if (load_eeprom()) {
+        ramp_style = eeprom[0];
+        #ifdef USE_RAMP_CONFIG
+        ramp_smooth_floor = eeprom[1];
+        ramp_smooth_ceil = eeprom[2];
+        ramp_discrete_floor = eeprom[3];
+        ramp_discrete_ceil = eeprom[4];
+        ramp_discrete_steps = eeprom[5];
+        #endif
+        #ifdef USE_BEACON_MODE
+        beacon_seconds = eeprom[6];
+        #endif
+        #ifdef USE_THERMAL_REGULATION
+        therm_ceil = eeprom[EEPROM_BYTES_BASE];
+        therm_cal_offset = eeprom[EEPROM_BYTES_BASE+1];
+        #endif
+        #ifdef USE_INDICATOR_LED
+        indicator_led_mode = eeprom[EEPROM_BYTES_BASE+EEPROM_THERMAL_BYTES];
+        #endif
+    }
+}
+
+void save_config() {
+    eeprom[0] = ramp_style;
+    #ifdef USE_RAMP_CONFIG
+    eeprom[1] = ramp_smooth_floor;
+    eeprom[2] = ramp_smooth_ceil;
+    eeprom[3] = ramp_discrete_floor;
+    eeprom[4] = ramp_discrete_ceil;
+    eeprom[5] = ramp_discrete_steps;
+    #endif
+    #ifdef USE_BEACON_MODE
+    eeprom[6] = beacon_seconds;
+    #endif
+    #ifdef USE_THERMAL_REGULATION
+    eeprom[EEPROM_BYTES_BASE  ] = therm_ceil;
+    eeprom[EEPROM_BYTES_BASE+1] = therm_cal_offset;
+    #endif
+    #ifdef USE_INDICATOR_LED
+    eeprom[EEPROM_BYTES_BASE+EEPROM_THERMAL_BYTES] = indicator_led_mode;
+    #endif
+
+    save_eeprom();
+}
+
+void low_voltage() {
+    StatePtr state = current_state;
+
+    // TODO: turn off aux LED(s) when power is really low
+
+    if (0) {}  // placeholder
+
+    // in normal mode, step down or turn off
+    else if (state == steady_state) {
+        if (actual_level > 1) {
+            uint8_t lvl = (actual_level >> 1) + (actual_level >> 2);
+            set_level(lvl);
+            #ifdef USE_THERMAL_REGULATION
+            target_level = lvl;
+            #ifdef USE_SET_LEVEL_GRADUALLY
+            // not needed?
+            //set_level_gradually(lvl);
+            #endif
+            #endif
+        }
+        else {
+            set_state(off_state, 0);
+        }
+    }
+    // all other modes, just turn off when voltage is low
+    else {
+        set_state(off_state, 0);
+    }
+}
+
+
+void setup() {
+    // blink at power-on to let user know power is connected
+    set_level(RAMP_SIZE/8);
+    delay_4ms(3);
+    set_level(0);
+
+    load_config();
+
+    push_state(off_state, 0);
+}
+
+
+void loop() {
+
+    StatePtr state = current_state;
+
+    if (0) {}
+
+    #ifdef USE_BATTCHECK
+    else if (state == battcheck_state) {
+        battcheck();
+    }
+    #endif
+
+    #ifdef USE_BEACON_MODE
+    else if (state == beacon_state) {
+        beacon_mode_iter();
+    }
+    #endif
+
+    #ifdef USE_THERMAL_REGULATION
+    // TODO: blink out therm_ceil during thermal_config_state?
+    else if (state == tempcheck_state) {
+        blink_num(temperature);
+        nice_delay_ms(1000);
+    }
+    #endif
+
+    #ifdef USE_IDLE_MODE
+    else {
+        // doze until next clock tick
+        idle_mode();
+    }
+    #endif
+
+}