Return from fade on "None"

.gitignore

@@ -38,6 +38,7 @@ _build
 # Virtual environment-specific files
 .env
 .venv
+venv
 
 # MacOS-specific files
 *.DS_Store

adafruit_is31fl3731/__init__.py

@@ -10,7 +10,7 @@
 
 Base library.
 
-* Author(s): Tony DiCola, Melissa LeBlanc-Williams, David Glaude
+* Author(s): Tony DiCola, Melissa LeBlanc-Williams, David Glaude, E. A. Graham Jr.
 
 Implementation Notes
 --------------------
@@ -202,13 +202,18 @@ def fade(self, fade_in=None, fade_out=None, pause=0):
         """
         if fade_in is None and fade_out is None:
             self._register(_CONFIG_BANK, _BREATH2_REGISTER, 0)
-        elif fade_in is None:
+            return
+        if fade_in is None:
             fade_in = fade_out
         elif fade_out is None:
             fade_out = fade_in
-        fade_in = int(math.log(fade_in / 26, 2))
-        fade_out = int(math.log(fade_out / 26, 2))
-        pause = int(math.log(pause / 26, 2))
+
+        if fade_in != 0:
+            fade_in = int(math.log(fade_in / 26, 2))
+        if fade_out != 0:
+            fade_out = int(math.log(fade_out / 26, 2))
+        if pause != 0:
+            pause = int(math.log(pause / 26, 2))
         if not 0 <= fade_in <= 7:
             raise ValueError("Fade in out of range")
         if not 0 <= fade_out <= 7:

examples/is31fl3731_ledshim_fade.py

@@ -0,0 +1,24 @@
+# SPDX-FileCopyrightText: 2023 E. A. Graham, Jr.
+# SPDX-License-Identifier: MIT
+
+import time
+import board
+import busio
+from adafruit_is31fl3731.led_shim import LedShim as Display
+
+i2c = busio.I2C(board.SCL, board.SDA)
+
+# initial display if you are using Pimoroni LED SHIM
+display = Display(i2c)
+
+y = 1
+for x in range(28):
+    display.pixel(x, y, 255)
+
+display.fade(fade_in=104, pause=250)
+
+try:
+    while True:
+        time.sleep(10)
+except KeyboardInterrupt:
+    display.sleep(True)