fix(patterns): remove blocking sleeps from pattern loops

Replace sleep-based timing in pattern generators with non-blocking tick checks so long delays do not block the main loop and risk watchdog resets.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/patterns/bar_graph.py

@@ -7,15 +7,23 @@ class BarGraph:
 
     def run(self, preset):
         colors = preset.c if preset.c else [(0, 255, 0), (255, 80, 0)]
+        last_update = utime.ticks_ms()
+        while True:
+            delay_ms = max(1, int(preset.d))
+            now = utime.ticks_ms()
+            if utime.ticks_diff(now, last_update) >= delay_ms:
                 level = max(0, min(100, int(preset.n1) if int(preset.n1) >= 0 else 50))
                 target = (self.driver.num_leds * level) // 100
                 lit = self.driver.apply_brightness(colors[0], preset.b)
-        unlit = self.driver.apply_brightness(colors[1] if len(colors) > 1 else (0, 0, 0), preset.b)
+                unlit = self.driver.apply_brightness(
-        while True:
+                    colors[1] if len(colors) > 1 else (0, 0, 0),
+                    preset.b,
+                )
                 for i in range(self.driver.num_leds):
                     self.driver.n[i] = lit if i < target else unlit
                 self.driver.n.write()
-            yield
+                last_update = utime.ticks_add(last_update, delay_ms)
                 if not preset.a:
+                    yield
                     return
-            utime.sleep_ms(max(1, int(preset.d)))
+            yield

src/patterns/heartbeat.py

@@ -7,19 +7,24 @@ class Heartbeat:
 
     def run(self, preset):
         colors = preset.c if preset.c else [(255, 0, 40)]
+        phase = 0
+        phase_start = utime.ticks_ms()
+        lit_color = self.driver.apply_brightness(colors[0], preset.b)
+        while True:
             p1 = max(20, int(preset.n1) if int(preset.n1) > 0 else 120)
             p2 = max(20, int(preset.n2) if int(preset.n2) > 0 else 80)
             pause = max(20, int(preset.n3) if int(preset.n3) > 0 else 500)
-        while True:
+            beat_gap = max(20, int(preset.d))
-            c = self.driver.apply_brightness(colors[0], preset.b)
+            lit_color = self.driver.apply_brightness(colors[0], preset.b)
-            self.driver.fill(c)
+            phase_durations = (p1, beat_gap, p2, pause)
-            utime.sleep_ms(p1)
+            phase_colors = (lit_color, (0, 0, 0), lit_color, (0, 0, 0))
-            self.driver.fill((0, 0, 0))
+
-            utime.sleep_ms(max(20, int(preset.d)))
+            now = utime.ticks_ms()
-            self.driver.fill(c)
+            if utime.ticks_diff(now, phase_start) >= phase_durations[phase]:
-            utime.sleep_ms(p2)
+                phase = (phase + 1) % 4
-            self.driver.fill((0, 0, 0))
+                phase_start = utime.ticks_add(phase_start, phase_durations[(phase - 1) % 4])
-            utime.sleep_ms(pause)
+
+            self.driver.fill(phase_colors[phase])
             yield
-            if not preset.a:
+            if not preset.a and phase == 0:
                 return

src/patterns/palette_morph.py

@@ -34,9 +34,15 @@ class PaletteMorph:
         base_idx = 0
         start = utime.ticks_ms()
         phase = self.driver.step % 256
+        last_update = start
 
         while True:
             now = utime.ticks_ms()
+            delay_ms = max(1, int(preset.d))
+            if utime.ticks_diff(now, last_update) < delay_ms:
+                yield
+                continue
+            last_update = utime.ticks_add(last_update, delay_ms)
             age = utime.ticks_diff(now, start)
             if age < morph:
                 t = (age * 255) // morph
@@ -72,5 +78,4 @@ class PaletteMorph:
                     return
             phase = (phase + warp_rate) & 255
             self.driver.step = phase
-            utime.sleep_ms(max(1, int(preset.d)))
             yield

src/patterns/strobe_burst.py

@@ -7,18 +7,38 @@ class StrobeBurst:
 
     def run(self, preset):
         colors = preset.c if preset.c else [(255, 255, 255)]
+        state = "flash_on"
+        flash_idx = 0
+        state_start = utime.ticks_ms()
+        while True:
             count = max(1, int(preset.n1) if int(preset.n1) > 0 else 3)
             gap = max(1, int(preset.n2) if int(preset.n2) > 0 else 60)
             cooldown = max(1, int(preset.n3) if int(preset.n3) > 0 else 400)
+            on_ms = max(1, int(preset.d) // 2)
             c = self.driver.apply_brightness(colors[0], preset.b)
-        while True:
+            now = utime.ticks_ms()
-            for _ in range(count):
+
+            if state == "flash_on":
                 self.driver.fill(c)
-                utime.sleep_ms(max(1, int(preset.d)//2))
+                if utime.ticks_diff(now, state_start) >= on_ms:
+                    state = "flash_off"
+                    state_start = utime.ticks_add(state_start, on_ms)
+            elif state == "flash_off":
                 self.driver.fill((0, 0, 0))
-                utime.sleep_ms(gap)
+                if utime.ticks_diff(now, state_start) >= gap:
-                yield
+                    flash_idx += 1
-            utime.sleep_ms(cooldown)
+                    if flash_idx >= count:
-            yield
                         if not preset.a:
                             return
+                        state = "cooldown"
+                        flash_idx = 0
+                        state_start = utime.ticks_add(state_start, gap)
+                    else:
+                        state = "flash_on"
+                        state_start = utime.ticks_add(state_start, gap)
+            else:
+                self.driver.fill((0, 0, 0))
+                if utime.ticks_diff(now, state_start) >= cooldown:
+                    state = "flash_on"
+                    state_start = utime.ticks_add(state_start, cooldown)
+            yield