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Add support for 50Hz filter #18

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Merged
merged 6 commits into from
Mar 22, 2020
Merged

Add support for 50Hz filter #18

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4621f88
Add support for 50Hz filter
ben-lewis Mar 21, 2020
47a70e4
Changed filter to filter_freq
ben-lewis Mar 21, 2020
1b22c88
Removed trailing whitespace
ben-lewis Mar 21, 2020
ccce9d8
Changed filter_freq to filter_frequency
ben-lewis Mar 22, 2020
d2324d8
Split a too long line
ben-lewis Mar 22, 2020
1668ba5
Fixed indentation
ben-lewis Mar 22, 2020
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15 changes: 13 additions & 2 deletions adafruit_max31865.py
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Original file line number Diff line number Diff line change
Expand Up @@ -96,16 +96,27 @@ class MAX31865:
# thread safe!
_BUFFER = bytearray(3)

def __init__(self, spi, cs, *, rtd_nominal=100, ref_resistor=430.0, wires=2):
def __init__(
self, spi, cs, *, rtd_nominal=100, ref_resistor=430.0,
wires=2, filter_frequency=60
):
self.rtd_nominal = rtd_nominal
self.ref_resistor = ref_resistor
self._device = spi_device.SPIDevice(
spi, cs, baudrate=500000, polarity=0, phase=1
)
# Set 50Hz or 60Hz filter.
if filter_frequency not in (50, 60):
raise ValueError("Filter_frequency must be a value of 50 or 60!")
config = self._read_u8(_MAX31865_CONFIG_REG)
if filter_frequency == 50:
config |= _MAX31865_CONFIG_FILT50HZ
else:
config &= ~_MAX31865_CONFIG_FILT50HZ

# Set wire config register based on the number of wires specified.
if wires not in (2, 3, 4):
raise ValueError("Wires must be a value of 2, 3, or 4!")
config = self._read_u8(_MAX31865_CONFIG_REG)
if wires == 3:
config |= _MAX31865_CONFIG_3WIRE
else:
Expand Down