Rework roll pattern to use gradient palette and add preset-based tests

Made-with: Cursor

pico/test/roll.py

@@ -0,0 +1,114 @@
+"""
+On-device visual test for the Roll pattern via Presets.
+
+This exercises src/patterns/roll.py (gradient from color1 to color2 across strips),
+not the low-level WS2812 driver.
+
+Usage (from pico/ dir or project root with adjusted paths):
+
+    mpremote connect <device> cp src/*.py :
+    mpremote connect <device> cp src/patterns/*.py :patterns
+    mpremote connect <device> cp lib/*.py :
+    mpremote connect <device> cp test/roll.py :
+    mpremote connect <device> run roll.py
+"""
+
+import utime
+
+from presets import Presets, Preset
+
+
+def make_roll_preset(name, color1, color2, delay_ms=60, brightness=255, direction=0):
+    """
+    Helper to build a Preset for the 'roll' pattern.
+
+    - color1: head color (full intensity)
+    - color2: tail color (end of gradient)
+    - direction: 0 = clockwise, 1 = anti-clockwise
+    """
+    data = {
+        "p": "roll",
+        "c": [color1, color2],
+        "b": brightness,
+        "d": delay_ms,
+        "n4": direction,
+        "a": True,  # animated
+    }
+    return name, Preset(data)
+
+
+def run_for(presets, duration_ms):
+    """Tick the current pattern for duration_ms."""
+    start = utime.ticks_ms()
+    while utime.ticks_diff(utime.ticks_ms(), start) < duration_ms:
+        presets.tick()
+        utime.sleep_ms(10)
+
+
+def main():
+    presets = Presets()
+    presets.load()
+
+    num_leds = presets.strip_length(0)
+    if num_leds <= 0:
+        print("No strips; aborting roll test.")
+        return
+
+    print("Starting roll pattern gradient tests via Presets...")
+
+    # A few different roll presets to compare:
+    roll_presets = []
+
+    # 1. White → off, clockwise (50% brightness, faster)
+    roll_presets.append(
+        make_roll_preset(
+            "roll_white_off_cw",
+            color1=(255, 255, 255),
+            color2=(0, 0, 0),
+            delay_ms=120,
+            brightness=128,
+            direction=0,
+        )
+    )
+
+    # 2. Warm white → cool blue, clockwise (50% brightness, faster)
+    roll_presets.append(
+        make_roll_preset(
+            "roll_warm_cool_cw",
+            color1=(255, 200, 100),
+            color2=(0, 0, 255),
+            delay_ms=130,
+            brightness=128,
+            direction=0,
+        )
+    )
+
+    # 3. Red → green, counter-clockwise (50% brightness, faster)
+    roll_presets.append(
+        make_roll_preset(
+            "roll_red_green_ccw",
+            color1=(255, 0, 0),
+            color2=(0, 255, 0),
+            delay_ms=110,
+            brightness=128,
+            direction=1,
+        )
+    )
+
+    # Register presets and run them one after another
+    for name, preset_obj in roll_presets:
+        presets.presets[name] = preset_obj
+
+    for name, _preset in roll_presets:
+        print("Running roll preset:", name)
+        presets.select(name)
+        run_for(presets, duration_ms=8000)
+
+    print("Roll pattern Presets test finished. Turning off LEDs.")
+    presets.select("off")
+    presets.tick()
+
+
+if __name__ == "__main__":
+    main()
+