remove SPI pin default settings

Author: CedarGroveStudios

cedargrove_ad5293.py

@@ -25,7 +25,6 @@
 """
 
 import time
-import board
 import digitalio
 from adafruit_bus_device.spi_device import SPIDevice
 
@@ -54,14 +53,12 @@ class AD5293:
     connections for SPI and the potentiometer chip. The AD5293 is also used in
     the AD9833-based Cedar Grove Precision VCO Eurorack module."""
 
-    def __init__(self, spi=board.SPI(), select=board.D9, wiper=0):
+    def __init__(self, spi=None, select=None, wiper=0):
         """Initialize the AD5293 device instance. During initialization, the
         potentiometer is reset, writing is enabled, and the wiper is set to the
         specified initialization value.
-        :param busio.SPI spi: The `busio.SPI` definition. Defaults to
-        `board.SPI()`.
-        :param board select: The chip select pin designation. Defaults to
-        `board.D9`.
+        :param busio.SPI spi: The `busio.SPI` definition. Defaults to None.
+        :param board select: The chip select pin designation. Defaults to None.
         :param int wiper: The initial 10-bit potentiometer wiper integer value,
         range from 0 to 1023. Defaults to 0."""