merged in BLF Lantern branch, even though it's not quite finished, because it's a public project and long overdue for a merge

6 files changed, 266 insertions, 44 deletions

diff --git a/spaghetti-monster/anduril/anduril.c b/spaghetti-monster/anduril/anduril.c
index 362dbeb..5878d47 100644
--- a/spaghetti-monster/anduril/anduril.c
+++ b/spaghetti-monster/anduril/anduril.c
@@ -145,6 +145,9 @@ typedef enum {
     ramp_discrete_ceil_e,
     ramp_discrete_steps_e,
     #endif
+    #ifdef USE_TINT_RAMPING
+    tint_e,
+    #endif
     #ifdef USE_STROBE_STATE
     strobe_type_e,
     #endif
@@ -182,6 +185,12 @@ typedef enum {
 #define USE_PSEUDO_RAND
 #endif
 
+#if defined(USE_CANDLE_MODE)
+#ifndef USE_TRIANGLE_WAVE
+#define USE_TRIANGLE_WAVE
+#endif
+#endif
+
 #include "spaghetti-monster.h"
 
 
@@ -198,6 +207,10 @@ 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_TINT_RAMPING
+// not actually a mode, more of a fallback under other modes
+uint8_t tint_ramping_state(Event event, uint16_t arg);
+#endif
 // party and tactical strobes
 #ifdef USE_STROBE_STATE
 uint8_t strobe_state(Event event, uint16_t arg);
@@ -243,6 +256,7 @@ uint8_t number_entry_state(Event event, uint16_t arg);
 volatile uint8_t number_entry_value;
 
 void blink_confirm(uint8_t num);
+void blip();
 #if defined(USE_INDICATOR_LED) && defined(TICK_DURING_STANDBY)
 void indicator_blink(uint8_t arg);
 #endif
@@ -255,6 +269,9 @@ void save_config_wl();
 #endif
 
 // default ramp options if not overridden earlier per-driver
+#ifndef RAMP_STYLE
+#define RAMP_STYLE 0  // smooth default
+#endif
 #ifndef RAMP_SMOOTH_FLOOR
   #define RAMP_SMOOTH_FLOOR 1
 #endif
@@ -298,7 +315,7 @@ void save_config_wl();
 #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_style = RAMP_STYLE;  // 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;
@@ -376,6 +393,9 @@ volatile uint8_t bike_flasher_brightness = MAX_1x7135;
 #ifdef USE_CANDLE_MODE
 uint8_t candle_mode_state(Event event, uint16_t arg);
 uint8_t triangle_wave(uint8_t phase);
+#ifndef CANDLE_AMPLITUDE
+#define CANDLE_AMPLITUDE 25
+#endif
 #endif
 
 #ifdef USE_BEACON_MODE
@@ -424,10 +444,7 @@ uint8_t off_state(Event event, uint16_t arg) {
         #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);
+            blip();
         } else
         #endif
         // don't start ramping immediately;
@@ -605,8 +622,7 @@ uint8_t steady_state(Event event, uint16_t arg) {
         #ifdef START_AT_MEMORIZED_LEVEL
         save_config_wl();
         #endif
-        set_level(0);
-        delay_4ms(20/4);
+        blip();
         set_level(memorized_level);
         return MISCHIEF_MANAGED;
     }
@@ -657,8 +673,7 @@ uint8_t steady_state(Event event, uint16_t arg) {
                 || (memorized_level == mode_min)
                 #endif
                 )) {
-            set_level(0);
-            delay_4ms(8/4);
+            blip();
         }
         #endif
         #if defined(BLINK_AT_STEPS)
@@ -672,8 +687,7 @@ uint8_t steady_state(Event event, uint16_t arg) {
                     (memorized_level == nearest)
                     )
         {
-            set_level(0);
-            delay_4ms(8/4);
+            blip();
         }
         #endif
         set_level(memorized_level);
@@ -719,8 +733,7 @@ uint8_t steady_state(Event event, uint16_t arg) {
                 || (memorized_level == mode_min)
                 #endif
                 )) {
-            set_level(0);
-            delay_4ms(8/4);
+            blip();
         }
         #endif
         #if defined(BLINK_AT_STEPS)
@@ -734,8 +747,7 @@ uint8_t steady_state(Event event, uint16_t arg) {
                     (memorized_level == nearest)
                     )
         {
-            set_level(0);
-            delay_4ms(8/4);
+            blip();
         }
         #endif
         set_level(memorized_level);
@@ -806,10 +818,7 @@ uint8_t steady_state(Event event, uint16_t arg) {
     // 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);
+        blip();
         #endif
         #ifdef THERM_HARD_TURBO_DROP
         if (actual_level > THERM_FASTER_LEVEL) {
@@ -837,10 +846,7 @@ uint8_t steady_state(Event event, uint16_t arg) {
     //               (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);
+        blip();
         #endif
         if (actual_level < target_level) {
             //int16_t stepup = actual_level + (arg>>1);
@@ -860,6 +866,69 @@ uint8_t steady_state(Event event, uint16_t arg) {
 }
 
 
+#ifdef USE_TINT_RAMPING
+uint8_t tint_ramping_state(Event event, uint16_t arg) {
+    static int8_t tint_ramp_direction = 1;
+    static uint8_t prev_tint = 0;
+    // don't activate auto-tint modes unless the user hits the edge
+    // and keeps pressing for a while
+    static uint8_t past_edge_counter = 0;
+    // bugfix: click-click-hold from off to strobes would invoke tint ramping
+    // in addition to changing state...  so ignore any tint-ramp events which
+    // don't look like they were meant to be here
+    static uint8_t active = 0;
+
+    // click, click, hold: change the tint
+    if (event == EV_click3_hold) {
+        // reset at beginning of movement
+        if (! arg) {
+            active = 1;  // first frame means this is for us
+            past_edge_counter = 0;  // doesn't start until user hits the edge
+        }
+        // ignore event if we weren't the ones who handled the first frame
+        if (! active) return EVENT_HANDLED;
+
+        // change normal tints
+        if ((tint_ramp_direction > 0) && (tint < 254)) {
+            tint += 1;
+        }
+        else if ((tint_ramp_direction < 0) && (tint > 1)) {
+            tint -= 1;
+        }
+        // if the user kept pressing long enough, go the final step
+        if (past_edge_counter == 64) {
+            past_edge_counter ++;
+            tint ^= 1;  // 0 -> 1, 254 -> 255
+            blip();
+        }
+        // if tint change stalled, let user know we hit the edge
+        else if (prev_tint == tint) {
+            if (past_edge_counter == 0) blip();
+            // count up but don't wrap back to zero
+            if (past_edge_counter < 255) past_edge_counter ++;
+        }
+        prev_tint = tint;
+        set_level(actual_level);
+        return EVENT_HANDLED;
+    }
+
+    // click, click, hold, release: reverse direction for next ramp
+    else if (event == EV_click3_hold_release) {
+        active = 0;  // ignore next hold if it wasn't meant for us
+        // reverse
+        tint_ramp_direction = -tint_ramp_direction;
+        if (tint == 0) tint_ramp_direction = 1;
+        else if (tint == 255) tint_ramp_direction = -1;
+        // remember tint after battery change
+        save_config();
+        return EVENT_HANDLED;
+    }
+
+    return EVENT_NOT_HANDLED;
+}
+#endif  // ifdef USE_TINT_RAMPING
+
+
 #ifdef USE_STROBE_STATE
 uint8_t strobe_state(Event event, uint16_t arg) {
     // 'st' reduces ROM size by avoiding access to a volatile var
@@ -1060,17 +1129,18 @@ inline void bike_flasher_iter() {
 
 #ifdef USE_CANDLE_MODE
 uint8_t candle_mode_state(Event event, uint16_t arg) {
-    // FIXME: make candle variance magnitude a compile-time option,
-    //        since 20 is sometimes too much or too little,
-    //        depending on the driver type and ramp shape
-    //#define MAX_CANDLE_LEVEL (RAMP_SIZE-8-6-4)
-    #define MAX_CANDLE_LEVEL (RAMP_SIZE/2)
+    #define MAX_CANDLE_LEVEL (RAMP_LENGTH-CANDLE_AMPLITUDE-15)
     static uint8_t candle_wave1 = 0;
     static uint8_t candle_wave2 = 0;
     static uint8_t candle_wave3 = 0;
     static uint8_t candle_wave2_speed = 0;
-    static uint8_t candle_wave2_depth = 7;
-    static uint8_t candle_wave3_depth = 4;
+    // these should add up to 100
+    #define CANDLE_WAVE1_MAXDEPTH 30
+    #define CANDLE_WAVE2_MAXDEPTH 45
+    #define CANDLE_WAVE3_MAXDEPTH 25
+    static const uint8_t candle_wave1_depth = CANDLE_WAVE1_MAXDEPTH * CANDLE_AMPLITUDE / 100;
+    static uint8_t candle_wave2_depth       = CANDLE_WAVE2_MAXDEPTH * CANDLE_AMPLITUDE / 100;
+    static uint8_t candle_wave3_depth       = CANDLE_WAVE3_MAXDEPTH * CANDLE_AMPLITUDE / 100;
     static uint8_t candle_mode_brightness = 24;
     static uint8_t candle_mode_timer = 0;
     #define TICKS_PER_CANDLE_MINUTE 4096 // about 65 seconds
@@ -1115,7 +1185,7 @@ uint8_t candle_mode_state(Event event, uint16_t arg) {
         // self-timer dims the light during the final minute
         uint8_t subtract = 0;
         if (candle_mode_timer == 1) {
-            subtract = ((candle_mode_brightness+20)
+            subtract = ((candle_mode_brightness+CANDLE_AMPLITUDE)
                      * ((arg & (TICKS_PER_CANDLE_MINUTE-1)) >> 4))
                      >> 8;
         }
@@ -1132,7 +1202,7 @@ uint8_t candle_mode_state(Event event, uint16_t arg) {
         }
         // 3-oscillator synth for a relatively organic pattern
         uint8_t add;
-        add = ((triangle_wave(candle_wave1) * 8) >> 8)
+        add = ((triangle_wave(candle_wave1) * candle_wave1_depth) >> 8)
             + ((triangle_wave(candle_wave2) * candle_wave2_depth) >> 8)
             + ((triangle_wave(candle_wave3) * candle_wave3_depth) >> 8);
         int8_t brightness = candle_mode_brightness + add - subtract;
@@ -1140,6 +1210,7 @@ uint8_t candle_mode_state(Event event, uint16_t arg) {
         set_level(brightness);
 
         // wave1: slow random LFO
+        // TODO: make wave slower and more erratic?
         if ((arg & 1) == 0) candle_wave1 += pseudo_rand() & 1;
         // wave2: medium-speed erratic LFO
         candle_wave2 += candle_wave2_speed;
@@ -1152,8 +1223,10 @@ uint8_t candle_mode_state(Event event, uint16_t arg) {
         if ((candle_wave2_depth > 0) && ((pseudo_rand() & 0b00111111) == 0))
             candle_wave2_depth --;
         // random sawtooth retrigger
-        if ((pseudo_rand()) == 0) {
-            candle_wave2_depth = 7;
+        if (pseudo_rand() == 0) {
+            // random amplitude
+            //candle_wave2_depth = 2 + (pseudo_rand() % ((CANDLE_WAVE2_MAXDEPTH * CANDLE_AMPLITUDE / 100) - 2));
+            candle_wave2_depth = pseudo_rand() % (CANDLE_WAVE2_MAXDEPTH * CANDLE_AMPLITUDE / 100);
             //candle_wave3_depth = 5;
             candle_wave2 = 0;
         }
@@ -1161,17 +1234,13 @@ uint8_t candle_mode_state(Event event, uint16_t arg) {
         if ((candle_wave3_depth > 2) && ((pseudo_rand() & 0b00011111) == 0))
             candle_wave3_depth --;
         if ((pseudo_rand() & 0b01111111) == 0)
-            candle_wave3_depth = 5;
+            // random amplitude
+            //candle_wave3_depth = 2 + (pseudo_rand() % ((CANDLE_WAVE3_MAXDEPTH * CANDLE_AMPLITUDE / 100) - 2));
+            candle_wave3_depth = pseudo_rand() % (CANDLE_WAVE3_MAXDEPTH * CANDLE_AMPLITUDE / 100);
         return MISCHIEF_MANAGED;
     }
     return EVENT_NOT_HANDLED;
 }
-
-uint8_t triangle_wave(uint8_t phase) {
-    uint8_t result = phase << 1;
-    if (phase > 127) result = 255 - result;
-    return result;
-}
 #endif  // #ifdef USE_CANDLE_MODE
 
 
@@ -1767,9 +1836,9 @@ uint8_t beacon_config_state(Event event, uint16_t arg) {
 inline void beacon_mode_iter() {
     // one iteration of main loop()
     set_level(memorized_level);
-    nice_delay_ms(500);
+    nice_delay_ms(100);
     set_level(0);
-    nice_delay_ms(((beacon_seconds) * 1000) - 500);
+    nice_delay_ms(((beacon_seconds) * 1000) - 100);
 }
 #endif  // #ifdef USE_BEACON_MODE
 
@@ -1901,6 +1970,14 @@ void blink_confirm(uint8_t num) {
     }
 }
 
+// Just go dark for a moment to indicate to user that something happened
+void blip() {
+    uint8_t temp = actual_level;
+    set_level(0);
+    delay_4ms(3);
+    set_level(temp);
+}
+
 
 #if defined(USE_INDICATOR_LED) && defined(TICK_DURING_STANDBY)
 // beacon-like mode for the indicator LED
@@ -1936,6 +2013,9 @@ void load_config() {
         ramp_discrete_ceil = eeprom[ramp_discrete_ceil_e];
         ramp_discrete_steps = eeprom[ramp_discrete_steps_e];
         #endif
+        #ifdef USE_TINT_RAMPING
+        tint = eeprom[tint_e];
+        #endif
         #if defined(USE_PARTY_STROBE_MODE) || defined(USE_TACTICAL_STROBE_MODE)
         strobe_type = eeprom[strobe_type_e];  // TODO: move this to eeprom_wl?
         strobe_delays[0] = eeprom[strobe_delays_0_e];
@@ -1974,6 +2054,9 @@ void save_config() {
     eeprom[ramp_discrete_ceil_e] = ramp_discrete_ceil;
     eeprom[ramp_discrete_steps_e] = ramp_discrete_steps;
     #endif
+    #ifdef USE_TINT_RAMPING
+    eeprom[tint_e] = tint;
+    #endif
     #if defined(USE_PARTY_STROBE_MODE) || defined(USE_TACTICAL_STROBE_MODE)
     eeprom[strobe_type_e] = strobe_type;  // TODO: move this to eeprom_wl?
     eeprom[strobe_delays_0_e] = strobe_delays[0];
@@ -2073,14 +2156,19 @@ void setup() {
 
     load_config();
 
+    #ifdef USE_TINT_RAMPING
+    // add tint ramping underneath every other state
+    push_state(tint_ramping_state, 0);
+    #endif  // ifdef USE_TINT_RAMPING
+
     #ifdef USE_MUGGLE_MODE
     if (muggle_mode_active)
         push_state(muggle_state, (MUGGLE_FLOOR+MUGGLE_CEILING)/2);
     else
     #endif
         push_state(off_state, 0);
-    #endif
 
+    #endif  // ifdef START_AT_MEMORIZED_LEVEL
 }
 
 
diff --git a/spaghetti-monster/anduril/cfg-blf-lantern.h b/spaghetti-monster/anduril/cfg-blf-lantern.h
new file mode 100644
index 0000000..9467397
--- /dev/null
+++ b/spaghetti-monster/anduril/cfg-blf-lantern.h
@@ -0,0 +1,78 @@
+// BLF Lantern config options for Anduril
+/* BLF Lantern pinout
+ *           ----
+ *   Reset -|1  8|- VCC
+ * eswitch -|2  7|- powerbank enable?
+ * aux LED -|3  6|- PWM (5000K)
+ *     GND -|4  5|- PWM (3000K)
+ *           ----
+ */
+
+// basically the same as a Q8...  sort of
+#include "hwdef-BLF_Q8.h"
+
+// 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
+
+#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
+
+// set floor and ceiling as far apart as possible
+// because this lantern isn't overpowered
+#define RAMP_STYLE 1  // 0 = smooth, 1 = stepped
+#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
+
+// 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_CEILING
+#define BLINK_AT_RAMP_CEILING
+#endif
diff --git a/spaghetti-monster/fsm-misc.c b/spaghetti-monster/fsm-misc.c
index e61fe00..9f953fa 100644
--- a/spaghetti-monster/fsm-misc.c
+++ b/spaghetti-monster/fsm-misc.c
@@ -146,5 +146,12 @@ void indicator_led_auto() {
 */
 #endif  // USE_INDICATOR_LED
 
+#ifdef USE_TRIANGLE_WAVE
+uint8_t triangle_wave(uint8_t phase) {
+    uint8_t result = phase << 1;
+    if (phase > 127) result = 255 - result;
+    return result;
+}
+#endif
 
 #endif
diff --git a/spaghetti-monster/fsm-misc.h b/spaghetti-monster/fsm-misc.h
index 4e0eb4f..6e41b6c 100644
--- a/spaghetti-monster/fsm-misc.h
+++ b/spaghetti-monster/fsm-misc.h
@@ -46,5 +46,8 @@ uint8_t blink(uint8_t num, uint8_t speed);
 void indicator_led(uint8_t lvl);
 #endif
 
+#ifdef USE_TRIANGLE_WAVE
+uint8_t triangle_wave(uint8_t phase);
+#endif
 
 #endif
diff --git a/spaghetti-monster/fsm-ramping.c b/spaghetti-monster/fsm-ramping.c
index 6cdf5e6..082f8c9 100644
--- a/spaghetti-monster/fsm-ramping.c
+++ b/spaghetti-monster/fsm-ramping.c
@@ -25,9 +25,11 @@
 
 void set_level(uint8_t level) {
     actual_level = level;
+
     #ifdef USE_SET_LEVEL_GRADUALLY
     gradual_target = level;
     #endif
+
     #ifdef USE_INDICATOR_LED
     #ifdef USE_INDICATOR_LED_WHILE_RAMPING
     if (! go_to_standby)
@@ -40,6 +42,7 @@ void set_level(uint8_t level) {
         indicator_led(0);
     #endif
     #endif
+
     //TCCR0A = PHASE;
     if (level == 0) {
         #if PWM_CHANNELS >= 1
@@ -56,6 +59,42 @@ void set_level(uint8_t level) {
         #endif
     } else {
         level --;
+
+        #ifdef USE_TINT_RAMPING
+        // calculate actual PWM levels based on a single-channel ramp
+        // and a global tint value
+        uint8_t brightness = pgm_read_byte(pwm1_levels + level);
+        uint8_t warm_PWM, cool_PWM;
+
+        // auto-tint modes
+        uint8_t mytint;
+        #if 1
+        // perceptual by ramp level
+        if (tint == 0) { mytint = 255 * (uint16_t)level / RAMP_SIZE; }
+        else if (tint == 255) { mytint = 255 - (255 * (uint16_t)level / RAMP_SIZE); }
+        #else
+        // linear with power level
+        //if (tint == 0) { mytint = brightness; }
+        //else if (tint == 255) { mytint = 255 - brightness; }
+        #endif
+        // stretch 1-254 to fit 0-255 range (hits every value except 98 and 198)
+        else { mytint = (tint * 100 / 99) - 1; }
+
+        // middle tints sag, so correct for that effect
+        uint16_t base_PWM = brightness;
+        // correction is only necessary when PWM is fast
+        if (level > HALFSPEED_LEVEL) {
+            base_PWM = brightness
+                     + ((((uint16_t)brightness) * 26 / 64) * triangle_wave(mytint) / 255);
+        }
+
+        cool_PWM = (((uint16_t)mytint * (uint16_t)base_PWM) + 127) / 255;
+        warm_PWM = base_PWM - cool_PWM;
+
+        PWM1_LVL = warm_PWM;
+        PWM2_LVL = cool_PWM;
+        #else
+
         #if PWM_CHANNELS >= 1
         PWM1_LVL = pgm_read_byte(pwm1_levels + level);
         #endif
@@ -68,6 +107,8 @@ void set_level(uint8_t level) {
         #if PWM_CHANNELS >= 4
         PWM4_LVL = pgm_read_byte(pwm4_levels + level);
         #endif
+
+        #endif  // ifdef USE_TINT_RAMPING
     }
     #ifdef USE_DYNAMIC_UNDERCLOCKING
     auto_clock_speed();
diff --git a/spaghetti-monster/fsm-ramping.h b/spaghetti-monster/fsm-ramping.h
index 14c8dae..dcc3b74 100644
--- a/spaghetti-monster/fsm-ramping.h
+++ b/spaghetti-monster/fsm-ramping.h
@@ -26,6 +26,11 @@
 // actual_level: last ramp level set by set_level()
 volatile uint8_t actual_level = 0;
 
+#ifdef USE_TINT_RAMPING
+uint8_t tint = 128;
+#define USE_TRIANGLE_WAVE
+#endif
+
 #ifdef USE_SET_LEVEL_GRADUALLY
 // adjust brightness very smoothly
 volatile uint8_t gradual_target;