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implement ocdetect and remove avgsel

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This commit is contained in:
Andrew de Quincey 2021-05-16 11:59:22 +01:00
parent 6ab6dcd701
commit be4228da37
3 changed files with 2 additions and 15 deletions
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8
config.py
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@ -132,11 +132,3 @@ temperature_average_samples = 5
# Thermocouple AC frequency filtering - set to True if in a 50Hz locale, else leave at False for 60Hz locale
ac_freq_50hz = False
# MAX31856 avgsel -- number of samples averaged on-chip prior to returning result. Values:
# 0: 1 sample
# 1: 2 samples
# 2: 4 samples
# 3: 8 samples
# 4: 16 samples
max31856_avgsel = 0

8
lib/max31856.py
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@ -89,12 +89,7 @@ class MAX31856(object):
MAX31856_S_TYPE = 0x6 # Read S Type Thermocouple
MAX31856_T_TYPE = 0x7 # Read T Type Thermocouple
MAX31856_OCDETECT_OFF = 0x00 # open circuit detection disabled
MAX31856_OCDETECT_1 = 0x01 # enabled every 16 conversions (Rs < 5kOhm)
MAX31856_OCDETECT_2 = 0x02 # enabled every 16 conversions (40kOhm < Rs > 5kOhm, time < 2ms)
MAX31856_OCDETECT_3 = 0x03 # enabled every 16 conversions (40kOhm < Rs > 5kOhm, time > 2ms)
def __init__(self, tc_type=MAX31856_S_TYPE, units="c", avgsel=0x0, ac_freq_50hz=False, ocdetect=0, software_spi=None, hardware_spi=None, gpio=None):
def __init__(self, tc_type=MAX31856_S_TYPE, units="c", avgsel=0x0, ac_freq_50hz=False, ocdetect=0x1, software_spi=None, hardware_spi=None, gpio=None):
"""
Initialize MAX31856 device with software SPI on the specified CLK,
CS, and DO pins. Alternatively can specify hardware SPI by sending an
@ -106,6 +101,7 @@ class MAX31856(object):
avgsel (1-byte Hex): Type of Averaging. Choose from values in CR0 table of datasheet.
Default is single sample.
ac_freq_50hz: Set to True if your AC frequency is 50Hz, Set to False for 60Hz,
ocdetect: Detect open circuit errors (ie broken thermocouple). Choose from values in CR1 table of datasheet
software_spi (dict): Contains the pin assignments for software SPI, as defined below:
clk (integer): Pin number for software SPI clk
cs (integer): Pin number for software SPI cs

1
lib/oven.py
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@ -120,7 +120,6 @@ class TempSensorReal(TempSensor):
self.thermocouple = MAX31856(tc_type=config.thermocouple_type,
software_spi = software_spi,
units = config.temp_scale,
avgsel = config.max31856_avgsel,
ac_freq_50hz = config.ac_freq_50hz,
)