Some fixes

examples/neopixel_spi_simpletest.py

@@ -1 +1,23 @@
-"""Eventual example for NeoPixel SPI"""
+import time
+import board
+import neopixel_spi as neopixel
+
+NUM_PIXELS = 12
+PIXEL_ORDER = neopixel.GRB
+COLORS = (0xFF0000, 0x00FF00, 0x0000FF)
+DELAY = 0.1
+
+spi = board.SPI()
+
+pixels = neopixel.NeoPixel_SPI(spi,
+                               NUM_PIXELS,
+                               pixel_order=PIXEL_ORDER,
+                               auto_write=False)
+
+while True:
+    for color in COLORS:
+        for i in range(NUM_PIXELS):
+            pixels[i] = color
+            pixels.show()
+            time.sleep(DELAY)
+            pixels.fill(0)

neopixel_spi.py

@@ -43,6 +43,16 @@
 * Adafruit's Bus Device library: https://github.com/adafruit/Adafruit_CircuitPython_BusDevice
 """
 
+# The following creates a mock neopixel_write module to allow importing
+# the CircuitPython NeoPixel module without actually providing neopixel_write.
+#pylint: disable=wrong-import-position, exec-used
+import sys
+from types import ModuleType
+MOCK_MODULE = ModuleType('mock_neopixel_write')
+exec('def neopixel_write(): pass', MOCK_MODULE.__dict__)
+sys.modules['neopixel_write'] = MOCK_MODULE
+#pylint: enable=wrong-import-position, exec-used
+
 from neopixel import NeoPixel
 
 __version__ = "0.0.0-auto.0"
@@ -96,7 +106,7 @@ def __init__(self, spi, n, *, bpp=3, brightness=1.0, auto_write=True, pixel_orde
             except AttributeError:
                 # use nominal
                 freq = self.FREQ
-        self.RESET = bytes([0]*round(freq*self.TRST))
+        self.RESET = bytes([0]*round(freq * self.TRST / 8))
         self.n = n
         if pixel_order is None:
             self.order = GRBW