Small fixes.

.gitignore

@@ -1,3 +1,4 @@
 __pycache__
 _build
 *.pyc
+*.mpy

adafruit_max31865.py

@@ -71,10 +71,10 @@ class MAX31865:
 
     def __init__(self, spi, cs, rtd_nominal=100, ref_resistor=430.0, wires=2):
         self.rtd_nominal = rtd_nominal
-        self.red_resistor = ref_resistor
+        self.ref_resistor = ref_resistor
         self._device = spi_device.SPIDevice(spi, cs)
         # Set wire config register based on the number of wires specified.
-        if wires not in _WIRE_MAP:
+        if wires not in (2, 3, 4):
             raise ValueError('Wires must be a value of 2, 3, or 4!')
         t = self._read_u8(_MAX31865_CONFIG_REG)
         if wires == 3:
@@ -91,7 +91,7 @@ class MAX31865:
         # Read an 8-bit unsigned value from the specified 8-bit address.
         with self._device as device:
             device.configure(baudrate=500000, phase=1, polarity=0)
-            _BUFFER[0] = address & 0x7F
+            self._BUFFER[0] = address & 0x7F
             device.write(self._BUFFER, end=1)
             device.readinto(self._BUFFER, end=1)
         return self._BUFFER[0]
@@ -111,7 +111,7 @@ class MAX31865:
             device.configure(baudrate=500000, phase=1, polarity=0)
             self._BUFFER[0] = (address & 0xFF) | 0x80
             self._BUFFER[1] = val & 0xFF
-            self._device.write(self._BUFFER, end=2)
+            device.write(self._BUFFER, end=2)
 
     @property
     def bias(self):
@@ -124,7 +124,7 @@ class MAX31865:
         if val:
             t |= _MAX31865_CONFIG_BIAS  # Enable bias.
         else:
-            t &= ~MAX31865_CONFIG_BIAS  # Disable bias.
+            t &= ~_MAX31865_CONFIG_BIAS  # Disable bias.
         self._write_u8(_MAX31865_CONFIG_REG, t)
 
     @property

examples/simpletest.py

@@ -2,6 +2,7 @@
 # Will print the temperature every second.
 import board
 import busio
+import digitalio
 import time
 
 import adafruit_max31865
@@ -9,7 +10,7 @@ import adafruit_max31865
 
 # Initialize SPI bus and sensor.
 spi = busio.SPI(board.SCK, MOSI=board.MOSI, MISO=board.MISO)
-cs =  board.D5  # Chip select of the MAX31865 board.
+cs =  digitalio.DigitalInOut(board.D5)  # Chip select of the MAX31865 board.
 sensor = adafruit_max31865.MAX31865(spi, cs)
 # Note you can optionally provide the thermocouple RTD nominal, the reference
 # resistance, and the number of wires for the sensor (2 the default, 3, or 4)
@@ -21,6 +22,6 @@ while True:
     # Read temperature.
     temp = sensor.temperature
     # Print the value.
-    print('Temperature: {0.3f}C'.format(temp))
+    print('Temperature: {0:0.3f}C'.format(temp))
     # Delay for a second.
     time.sleep(1.0)