Disable SDO pin upon initialization

Author: CedarGroveStudios

README.rst

@@ -24,7 +24,7 @@ resistive potentiometer, but requires that voltages placed on any of the
 three pins not exceed the analog power supply voltage.
 
 The CircuitPython driver supports a single SPI potentiometer device per instance.
-It does not work with daisy-chained devices.
+It does not work with daisy-chained devices. The SDO pin is set to high-impedance.
 
 The Cedar Grove AD5293 custom breakout board provides power and signal
 connections for SPI and the potentiometer chip. The AD5293 is also

cedargrove_ad5293.py

@@ -44,7 +44,8 @@ class AD5293:
     placed on any of the three pins not exceed the analog power supply voltage.
 
     The CircuitPython driver supports a single SPI potentiometer device per
-    instance. It does not work with daisy-chained devices.
+    instance. It does not work with daisy-chained devices. The SDO pin is
+    set to high-impedance.
 
     The Cedar Grove AD5293 custom breakout board provides power and signal
     connections for SPI and the potentiometer chip. The AD5293 is also used in
@@ -71,6 +72,10 @@ def __init__(self, spi=board.SPI(), select=board.D9, wiper=0):
         # Power on delay (2ms minimum)
         time.sleep(0.03)
 
+        # Disable SDO pin (high impedance)
+        self._send_data(0x8001)  # Disable SDO
+        self._send_data(0x0000)  # NOP
+
         # Place device into normal mode (not powered-down)
         self._send_data(0x2000)