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thermocouple: Add support for MAX6675 chip

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The MAX6675 chip has a different read sequence than the MAX31855 chip.

Signed-off-by: Ricardo Amézquita <ramezquitao@cihologramas.com>
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Ricardo Amezquita 2018-06-17 19:59:29 -05:00 • committed by Kevin O'Connor
parent eba252d3fd
commit 756514adef
2 changed files with 36 additions and 9 deletions
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21
klippy/extras/spi_temperature.py
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@ -15,9 +15,10 @@ SAMPLE_COUNT_DEFAULT = 8
REPORT_TIME_DEFAULT = 0.300
VALID_SPI_SENSORS = {
'MAX6675' : 1, 'MAX31855' : 1,
'MAX31855' : 1,
'MAX31856' : 2,
'MAX31865' : 4
'MAX31865' : 4,
'MAX6675' : 8
}
class error(Exception):
@ -180,18 +181,26 @@ class Thermocouple(SensorBase):
if chip_type == "MAX31856":
self.val_a = 0.0078125
self.scale = 5
elif chip_type == "MAX6675":
self.val_a = 0.25
self.scale = 3
else:
self.val_a = 0.25
self.scale = 18
SensorBase.__init__(self, config, is_spi = True, sample_count = 1)
def _check_faults_simple(self, val):
if not self.chip_type == "MAX31856":
if self.chip_type == "MAX6675":
if val & 0x02:
raise self.error("Max6675 : Device ID error")
if val & 0x04:
raise self.error("Max6675 : Thermocouple Open Fault")
elif not self.chip_type == "MAX31856":
if val & 0x1:
raise self.error("MAX6675/MAX31855 : Open Circuit")
raise self.error("MAX31855 : Open Circuit")
if val & 0x2:
raise self.error("MAX6675/MAX31855 : Short to GND")
raise self.error("MAX31855 : Short to GND")
if val & 0x4:
raise self.error("MAX6675/MAX31855 : Short to Vcc")
raise self.error("MAX31855 : Short to Vcc")
def check_faults(self, fault):
if self.chip_type == "MAX31856":
if fault & MAX31856_FAULT_CJRANGE: