mirror of https://github.com/Desuuuu/klipper.git
345 lines
13 KiB
Python
345 lines
13 KiB
Python
# Support for common SPI based thermocouple and RTD temperature sensors
|
|
#
|
|
# Copyright (C) 2018 Petri Honkala <cruwaller@gmail.com>
|
|
# Copyright (C) 2018 Kevin O'Connor <kevin@koconnor.net>
|
|
#
|
|
# This file may be distributed under the terms of the GNU GPLv3 license.
|
|
import math
|
|
import bus
|
|
|
|
# Sensor types defined in the micro-controller code (thermocouple.c)
|
|
TS_CHIP_MAX31855 = 1 << 0
|
|
TS_CHIP_MAX31856 = 1 << 1
|
|
TS_CHIP_MAX31865 = 1 << 2
|
|
TS_CHIP_MAX6675 = 1 << 3
|
|
|
|
|
|
######################################################################
|
|
# SensorBase
|
|
######################################################################
|
|
|
|
REPORT_TIME = 0.300
|
|
|
|
class SensorBase:
|
|
def __init__(self, config, chip_type, config_cmd=None):
|
|
self.printer = config.get_printer()
|
|
self._callback = None
|
|
self.min_sample_value = self.max_sample_value = 0
|
|
self._report_clock = 0
|
|
self.spi = bus.MCU_SPI_from_config(
|
|
config, 1, pin_option="sensor_pin", default_speed=4000000)
|
|
if config_cmd is not None:
|
|
self.spi.spi_send(config_cmd)
|
|
self.mcu = mcu = self.spi.get_mcu()
|
|
# Reader chip configuration
|
|
self.oid = oid = mcu.create_oid()
|
|
mcu.add_config_cmd(
|
|
"config_thermocouple oid=%u spi_oid=%u chip_type=%u" % (
|
|
oid, self.spi.get_oid(), chip_type))
|
|
mcu.register_msg(self._handle_spi_response, "thermocouple_result", oid)
|
|
mcu.register_config_callback(self._build_config)
|
|
def setup_minmax(self, min_temp, max_temp):
|
|
adc_range = [self.calc_adc(min_temp), self.calc_adc(max_temp)]
|
|
self.min_sample_value = min(adc_range)
|
|
self.max_sample_value = max(adc_range)
|
|
def setup_callback(self, cb):
|
|
self._callback = cb
|
|
def get_report_time_delta(self):
|
|
return REPORT_TIME
|
|
def _build_config(self):
|
|
clock = self.mcu.get_query_slot(self.oid)
|
|
self._report_clock = self.mcu.seconds_to_clock(REPORT_TIME)
|
|
self.mcu.add_config_cmd(
|
|
"query_thermocouple oid=%u clock=%u rest_ticks=%u"
|
|
" min_value=%u max_value=%u" % (
|
|
self.oid, clock, self._report_clock,
|
|
self.min_sample_value, self.max_sample_value), is_init=True)
|
|
def _handle_spi_response(self, params):
|
|
temp = self.calc_temp(params['value'], params['fault'])
|
|
next_clock = self.mcu.clock32_to_clock64(params['next_clock'])
|
|
last_read_clock = next_clock - self._report_clock
|
|
last_read_time = self.mcu.clock_to_print_time(last_read_clock)
|
|
self._callback(last_read_time, temp)
|
|
def fault(self, msg):
|
|
self.printer.invoke_async_shutdown(msg)
|
|
|
|
|
|
######################################################################
|
|
# MAX31856 thermocouple
|
|
######################################################################
|
|
|
|
MAX31856_CR0_REG = 0x00
|
|
MAX31856_CR0_AUTOCONVERT = 0x80
|
|
MAX31856_CR0_1SHOT = 0x40
|
|
MAX31856_CR0_OCFAULT1 = 0x20
|
|
MAX31856_CR0_OCFAULT0 = 0x10
|
|
MAX31856_CR0_CJ = 0x08
|
|
MAX31856_CR0_FAULT = 0x04
|
|
MAX31856_CR0_FAULTCLR = 0x02
|
|
MAX31856_CR0_FILT50HZ = 0x01
|
|
MAX31856_CR0_FILT60HZ = 0x00
|
|
|
|
MAX31856_CR1_REG = 0x01
|
|
MAX31856_CR1_AVGSEL1 = 0x00
|
|
MAX31856_CR1_AVGSEL2 = 0x10
|
|
MAX31856_CR1_AVGSEL4 = 0x20
|
|
MAX31856_CR1_AVGSEL8 = 0x30
|
|
MAX31856_CR1_AVGSEL16 = 0x70
|
|
|
|
MAX31856_MASK_REG = 0x02
|
|
MAX31856_MASK_COLD_JUNCTION_HIGH_FAULT = 0x20
|
|
MAX31856_MASK_COLD_JUNCTION_LOW_FAULT = 0x10
|
|
MAX31856_MASK_THERMOCOUPLE_HIGH_FAULT = 0x08
|
|
MAX31856_MASK_THERMOCOUPLE_LOW_FAULT = 0x04
|
|
MAX31856_MASK_VOLTAGE_UNDER_OVER_FAULT = 0x02
|
|
MAX31856_MASK_THERMOCOUPLE_OPEN_FAULT = 0x01
|
|
|
|
MAX31856_CJHF_REG = 0x03
|
|
MAX31856_CJLF_REG = 0x04
|
|
MAX31856_LTHFTH_REG = 0x05
|
|
MAX31856_LTHFTL_REG = 0x06
|
|
MAX31856_LTLFTH_REG = 0x07
|
|
MAX31856_LTLFTL_REG = 0x08
|
|
MAX31856_CJTO_REG = 0x09
|
|
MAX31856_CJTH_REG = 0x0A
|
|
MAX31856_CJTL_REG = 0x0B
|
|
MAX31856_LTCBH_REG = 0x0C
|
|
MAX31856_LTCBM_REG = 0x0D
|
|
MAX31856_LTCBL_REG = 0x0E
|
|
|
|
MAX31856_SR_REG = 0x0F
|
|
MAX31856_FAULT_CJRANGE = 0x80 # Cold Junction out of range
|
|
MAX31856_FAULT_TCRANGE = 0x40 # Thermocouple out of range
|
|
MAX31856_FAULT_CJHIGH = 0x20 # Cold Junction High
|
|
MAX31856_FAULT_CJLOW = 0x10 # Cold Junction Low
|
|
MAX31856_FAULT_TCHIGH = 0x08 # Thermocouple Low
|
|
MAX31856_FAULT_TCLOW = 0x04 # Thermocouple Low
|
|
MAX31856_FAULT_OVUV = 0x02 # Under Over Voltage
|
|
MAX31856_FAULT_OPEN = 0x01
|
|
|
|
MAX31856_SCALE = 5
|
|
MAX31856_MULT = 0.0078125
|
|
|
|
class MAX31856(SensorBase):
|
|
def __init__(self, config):
|
|
SensorBase.__init__(self, config, TS_CHIP_MAX31856,
|
|
self.build_spi_init(config))
|
|
def calc_temp(self, adc, fault):
|
|
if fault & MAX31856_FAULT_CJRANGE:
|
|
self.fault("Max31856: Cold Junction Range Fault")
|
|
if fault & MAX31856_FAULT_TCRANGE:
|
|
self.fault("Max31856: Thermocouple Range Fault")
|
|
if fault & MAX31856_FAULT_CJHIGH:
|
|
self.fault("Max31856: Cold Junction High Fault")
|
|
if fault & MAX31856_FAULT_CJLOW:
|
|
self.fault("Max31856: Cold Junction Low Fault")
|
|
if fault & MAX31856_FAULT_TCHIGH:
|
|
self.fault("Max31856: Thermocouple High Fault")
|
|
if fault & MAX31856_FAULT_TCLOW:
|
|
self.fault("Max31856: Thermocouple Low Fault")
|
|
if fault & MAX31856_FAULT_OVUV:
|
|
self.fault("Max31856: Over/Under Voltage Fault")
|
|
if fault & MAX31856_FAULT_OPEN:
|
|
self.fault("Max31856: Thermocouple Open Fault")
|
|
adc = adc >> MAX31856_SCALE
|
|
# Fix sign bit:
|
|
if adc & 0x40000:
|
|
adc = ((adc & 0x3FFFF) + 1) * -1
|
|
temp = MAX31856_MULT * adc
|
|
return temp
|
|
def calc_adc(self, temp):
|
|
adc = int( ( temp / MAX31856_MULT ) + 0.5 ) # convert to ADC value
|
|
adc = adc << MAX31856_SCALE
|
|
return adc
|
|
def build_spi_init(self, config):
|
|
cmds = []
|
|
value = MAX31856_CR0_AUTOCONVERT
|
|
if config.getboolean('tc_use_50Hz_filter', False):
|
|
value |= MAX31856_CR0_FILT50HZ
|
|
cmds.append(0x80 + MAX31856_CR0_REG)
|
|
cmds.append(value)
|
|
|
|
types = {
|
|
"B" : 0b0000,
|
|
"E" : 0b0001,
|
|
"J" : 0b0010,
|
|
"K" : 0b0011,
|
|
"N" : 0b0100,
|
|
"R" : 0b0101,
|
|
"S" : 0b0110,
|
|
"T" : 0b0111,
|
|
}
|
|
value = config.getchoice('tc_type', types, default="K")
|
|
averages = {
|
|
"1" : MAX31856_CR1_AVGSEL1,
|
|
"2" : MAX31856_CR1_AVGSEL2,
|
|
"4" : MAX31856_CR1_AVGSEL4,
|
|
"8" : MAX31856_CR1_AVGSEL8,
|
|
"16" : MAX31856_CR1_AVGSEL16
|
|
}
|
|
value |= config.getchoice('tc_averaging_count', averages, "1")
|
|
cmds.append(0x80 + MAX31856_CR1_REG)
|
|
cmds.append(value)
|
|
|
|
value = (MAX31856_MASK_VOLTAGE_UNDER_OVER_FAULT |
|
|
MAX31856_MASK_THERMOCOUPLE_OPEN_FAULT)
|
|
cmds.append(0x80 + MAX31856_MASK_REG)
|
|
cmds.append(value)
|
|
return cmds
|
|
|
|
|
|
######################################################################
|
|
# MAX31855 thermocouple
|
|
######################################################################
|
|
|
|
MAX31855_SCALE = 18
|
|
MAX31855_MULT = 0.25
|
|
|
|
class MAX31855(SensorBase):
|
|
def __init__(self, config):
|
|
SensorBase.__init__(self, config, TS_CHIP_MAX31855)
|
|
def calc_temp(self, adc, fault):
|
|
if adc & 0x1:
|
|
self.fault("MAX31855 : Open Circuit")
|
|
if adc & 0x2:
|
|
self.fault("MAX31855 : Short to GND")
|
|
if adc & 0x4:
|
|
self.fault("MAX31855 : Short to Vcc")
|
|
adc = adc >> MAX31855_SCALE
|
|
# Fix sign bit:
|
|
if adc & 0x2000:
|
|
adc = ((adc & 0x1FFF) + 1) * -1
|
|
temp = MAX31855_MULT * adc
|
|
return temp
|
|
def calc_adc(self, temp):
|
|
adc = int( ( temp / MAX31855_MULT ) + 0.5 ) # convert to ADC value
|
|
adc = adc << MAX31855_SCALE
|
|
return adc
|
|
|
|
|
|
######################################################################
|
|
# MAX6675 thermocouple
|
|
######################################################################
|
|
|
|
MAX6675_SCALE = 3
|
|
MAX6675_MULT = 0.25
|
|
|
|
class MAX6675(SensorBase):
|
|
def __init__(self, config):
|
|
SensorBase.__init__(self, config, TS_CHIP_MAX6675)
|
|
def calc_temp(self, adc, fault):
|
|
if adc & 0x02:
|
|
self.fault("Max6675 : Device ID error")
|
|
if adc & 0x04:
|
|
self.fault("Max6675 : Thermocouple Open Fault")
|
|
adc = adc >> MAX6675_SCALE
|
|
# Fix sign bit:
|
|
if adc & 0x2000:
|
|
adc = ((adc & 0x1FFF) + 1) * -1
|
|
temp = MAX6675_MULT * adc
|
|
return temp
|
|
def calc_adc(self, temp):
|
|
adc = int( ( temp / MAX6675_MULT ) + 0.5 ) # convert to ADC value
|
|
adc = adc << MAX6675_SCALE
|
|
return adc
|
|
|
|
|
|
######################################################################
|
|
# MAX31865 (RTD sensor)
|
|
######################################################################
|
|
|
|
MAX31865_CONFIG_REG = 0x00
|
|
MAX31865_RTDMSB_REG = 0x01
|
|
MAX31865_RTDLSB_REG = 0x02
|
|
MAX31865_HFAULTMSB_REG = 0x03
|
|
MAX31865_HFAULTLSB_REG = 0x04
|
|
MAX31865_LFAULTMSB_REG = 0x05
|
|
MAX31865_LFAULTLSB_REG = 0x06
|
|
MAX31865_FAULTSTAT_REG = 0x07
|
|
|
|
MAX31865_CONFIG_BIAS = 0x80
|
|
MAX31865_CONFIG_MODEAUTO = 0x40
|
|
MAX31865_CONFIG_1SHOT = 0x20
|
|
MAX31865_CONFIG_3WIRE = 0x10
|
|
MAX31865_CONFIG_FAULTCLEAR = 0x02
|
|
MAX31865_CONFIG_FILT50HZ = 0x01
|
|
|
|
MAX31865_FAULT_HIGHTHRESH = 0x80
|
|
MAX31865_FAULT_LOWTHRESH = 0x40
|
|
MAX31865_FAULT_REFINLOW = 0x20
|
|
MAX31865_FAULT_REFINHIGH = 0x10
|
|
MAX31865_FAULT_RTDINLOW = 0x08
|
|
MAX31865_FAULT_OVUV = 0x04
|
|
|
|
VAL_A = 0.00390830
|
|
VAL_B = 0.0000005775
|
|
VAL_C = -0.00000000000418301
|
|
VAL_ADC_MAX = 32768.0 # 2^15
|
|
|
|
class MAX31865(SensorBase):
|
|
def __init__(self, config):
|
|
self.rtd_nominal_r = config.getint('rtd_nominal_r', 100)
|
|
self.reference_r = config.getfloat('rtd_reference_r', 430., above=0.)
|
|
SensorBase.__init__(self, config, TS_CHIP_MAX31865,
|
|
self.build_spi_init(config))
|
|
def calc_temp(self, adc, fault):
|
|
if fault & 0x80:
|
|
self.fault("Max31865 RTD input is disconnected")
|
|
if fault & 0x40:
|
|
self.fault("Max31865 RTD input is shorted")
|
|
if fault & 0x20:
|
|
self.fault("Max31865 VREF- is greater than 0.85 * VBIAS, FORCE- open")
|
|
if fault & 0x10:
|
|
self.fault("Max31865 VREF- is less than 0.85 * VBIAS, FORCE- open")
|
|
if fault & 0x08:
|
|
self.fault("Max31865 VRTD- is less than 0.85 * VBIAS, FORCE- open")
|
|
if fault & 0x04:
|
|
self.fault("Max31865 Overvoltage or undervoltage fault")
|
|
if fault & 0x03:
|
|
self.fault("Max31865 Unspecified error")
|
|
adc = adc >> 1 # remove fault bit
|
|
R_rtd = (self.reference_r * adc) / VAL_ADC_MAX
|
|
temp = (
|
|
(( ( -1 * self.rtd_nominal_r ) * VAL_A ) +
|
|
math.sqrt( ( self.rtd_nominal_r * self.rtd_nominal_r * VAL_A * VAL_A ) -
|
|
( 4 * self.rtd_nominal_r * VAL_B * ( self.rtd_nominal_r - R_rtd ) )))
|
|
/ (2 * self.rtd_nominal_r * VAL_B))
|
|
return temp
|
|
def calc_adc(self, temp):
|
|
R_rtd = temp * ( 2 * self.rtd_nominal_r * VAL_B )
|
|
R_rtd = math.pow( ( R_rtd + ( self.rtd_nominal_r * VAL_A ) ), 2)
|
|
R_rtd = -1 * ( R_rtd - ( self.rtd_nominal_r * self.rtd_nominal_r * VAL_A * VAL_A ) )
|
|
R_rtd = R_rtd / ( 4 * self.rtd_nominal_r * VAL_B )
|
|
R_rtd = ( -1 * R_rtd ) + self.rtd_nominal_r
|
|
adc = int( ( ( R_rtd * VAL_ADC_MAX ) / self.reference_r) + 0.5 )
|
|
adc = adc << 1 # Add fault bit
|
|
return adc
|
|
def build_spi_init(self, config):
|
|
value = (MAX31865_CONFIG_BIAS |
|
|
MAX31865_CONFIG_MODEAUTO |
|
|
MAX31865_CONFIG_FAULTCLEAR)
|
|
if config.getboolean('rtd_use_50Hz_filter', False):
|
|
value |= MAX31865_CONFIG_FILT50HZ
|
|
if config.getint('rtd_num_of_wires', 2) == 3:
|
|
value |= MAX31865_CONFIG_3WIRE
|
|
cmd = 0x80 + MAX31865_CONFIG_REG
|
|
return [cmd, value]
|
|
|
|
|
|
######################################################################
|
|
# Sensor registration
|
|
######################################################################
|
|
|
|
Sensors = {
|
|
"MAX6675": MAX6675,
|
|
"MAX31855": MAX31855,
|
|
"MAX31856": MAX31856,
|
|
"MAX31865": MAX31865,
|
|
}
|
|
|
|
def load_config(config):
|
|
# Register sensors
|
|
pheater = config.get_printer().lookup_object("heater")
|
|
for name, klass in Sensors.items():
|
|
pheater.add_sensor(name, klass)
|