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# Support for micro-controller chip based temperature sensors
#
# Copyright (C) 2020-2024 Kevin O'Connor <kevin@koconnor.net>
#
# This file may be distributed under the terms of the GNU GPLv3 license.
import logging
import mcu
from . import adc_temperature
SAMPLE_TIME = 0.001
SAMPLE_COUNT = 8
REPORT_TIME = 0.300
RANGE_CHECK_COUNT = 4
class PrinterTemperatureMCU:
def __init__(self, config):
self.printer = config.get_printer()
self.base_temperature = self.slope = None
self.temp1 = self.adc1 = self.temp2 = self.adc2 = None
self.min_temp = self.max_temp = 0.
self.debug_read_cmd = None
# Read config
mcu_name = config.get('sensor_mcu', 'mcu')
self.temp1 = config.getfloat('sensor_temperature1', None)
if self.temp1 is not None:
self.adc1 = config.getfloat('sensor_adc1', minval=0., maxval=1.)
self.temp2 = config.getfloat('sensor_temperature2', None)
if self.temp2 is not None:
self.adc2 = config.getfloat('sensor_adc2', minval=0., maxval=1.)
# Setup ADC port
ppins = config.get_printer().lookup_object('pins')
self.mcu_adc = ppins.setup_pin('adc',
'%s:ADC_TEMPERATURE' % (mcu_name,))
self.mcu_adc.setup_adc_callback(REPORT_TIME, self.adc_callback)
self.diag_helper = adc_temperature.HelperTemperatureDiagnostics(
config, self.mcu_adc, self.calc_temp)
# Register callbacks
if self.printer.get_start_args().get('debugoutput') is not None:
self.mcu_adc.setup_adc_sample(SAMPLE_TIME, SAMPLE_COUNT)
return
self.printer.register_event_handler("klippy:mcu_identify",
self.handle_mcu_identify)
# Temperature interface
def setup_callback(self, temperature_callback):
self.temperature_callback = temperature_callback
def get_report_time_delta(self):
return REPORT_TIME
def setup_minmax(self, min_temp, max_temp):
self.min_temp = min_temp
self.max_temp = max_temp
# Internal code
def adc_callback(self, read_time, read_value):
temp = self.base_temperature + read_value * self.slope
self.temperature_callback(read_time + SAMPLE_COUNT * SAMPLE_TIME, temp)
def calc_temp(self, adc):
return self.base_temperature + adc * self.slope
def calc_adc(self, temp):
return (temp - self.base_temperature) / self.slope
def calc_base(self, temp, adc):
return temp - adc * self.slope
def handle_mcu_identify(self):
# Obtain mcu information
mcu = self.mcu_adc.get_mcu()
self.debug_read_cmd = mcu.lookup_query_command(
"debug_read order=%c addr=%u", "debug_result val=%u")
self.mcu_type = mcu.get_constants().get("MCU", "")
# Run MCU specific configuration
cfg_funcs = [
('rp2', self.config_rp2040),
('sam3', self.config_sam3), ('sam4', self.config_sam4),
('same70', self.config_same70), ('samd21', self.config_samd21),
('samd51', self.config_samd51), ('same5', self.config_samd51),
('stm32f1', self.config_stm32f1), ('stm32f2', self.config_stm32f2),
('stm32f4', self.config_stm32f4),
('stm32f042', self.config_stm32f0x2),
('stm32f070', self.config_stm32f070),
('stm32f072', self.config_stm32f0x2),
('stm32g0', self.config_stm32g0),
('stm32g4', self.config_stm32g0),
('stm32l4', self.config_stm32g0),
('stm32h723', self.config_stm32h723),
('stm32h7', self.config_stm32h7),
('', self.config_unknown)]
for name, func in cfg_funcs:
if self.mcu_type.startswith(name):
func()
break
logging.info("mcu_temperature '%s' nominal base=%.6f slope=%.6f",
mcu.get_name(), self.base_temperature, self.slope)
# Setup manual base/slope override
if self.temp1 is not None:
if self.temp2 is not None:
self.slope = (self.temp2 - self.temp1) / (self.adc2 - self.adc1)
self.base_temperature = self.calc_base(self.temp1, self.adc1)
# Setup min/max checks
arange = [self.calc_adc(t) for t in [self.min_temp, self.max_temp]]
min_adc, max_adc = sorted(arange)
self.mcu_adc.setup_adc_sample(SAMPLE_TIME, SAMPLE_COUNT,
minval=min_adc, maxval=max_adc,
range_check_count=RANGE_CHECK_COUNT)
self.diag_helper.setup_diag_minmax(self.min_temp, self.max_temp,
min_adc, max_adc)
def config_unknown(self):
raise self.printer.config_error("MCU temperature not supported on %s"
% (self.mcu_type,))
def config_rp2040(self):
self.slope = 3.3 / -0.001721
self.base_temperature = self.calc_base(27., 0.706 / 3.3)
def config_sam3(self):
self.slope = 3.3 / .002650
self.base_temperature = self.calc_base(27., 0.8 / 3.3)
def config_sam4(self):
self.slope = 3.3 / .004700
self.base_temperature = self.calc_base(27., 1.44 / 3.3)
def config_same70(self):
self.slope = 3.3 / .002330
self.base_temperature = self.calc_base(25., 0.72 / 3.3)
def config_samd21(self, addr=0x00806030):
def get1v(val):
if val & 0x80:
val = 0x100 - val
return 1. - val / 1000.
cal1 = self.read32(addr)
cal2 = self.read32(addr + 4)
room_temp = ((cal1 >> 0) & 0xff) + ((cal1 >> 8) & 0xf) / 10.
hot_temp = ((cal1 >> 12) & 0xff) + ((cal1 >> 20) & 0xf) / 10.
room_1v = get1v((cal1 >> 24) & 0xff)
hot_1v = get1v((cal2 >> 0) & 0xff)
room_adc = ((cal2 >> 8) & 0xfff) * room_1v / (3.3 * 4095.)
hot_adc = ((cal2 >> 20) & 0xfff) * hot_1v / (3.3 * 4095.)
self.slope = (hot_temp - room_temp) / (hot_adc - room_adc)
self.base_temperature = self.calc_base(room_temp, room_adc)
def config_samd51(self):
self.config_samd21(addr=0x00800100)
def config_stm32f1(self):
self.slope = 3.3 / -.004300
self.base_temperature = self.calc_base(25., 1.43 / 3.3)
def config_stm32f2(self):
self.slope = 3.3 / .002500
self.base_temperature = self.calc_base(25., .76 / 3.3)
def config_stm32f4(self, addr1=0x1FFF7A2C, addr2=0x1FFF7A2E):
cal_adc_30 = self.read16(addr1) / 4095.
cal_adc_110 = self.read16(addr2) / 4095.
self.slope = (110. - 30.) / (cal_adc_110 - cal_adc_30)
self.base_temperature = self.calc_base(30., cal_adc_30)
def config_stm32f0x2(self):
self.config_stm32f4(addr1=0x1FFFF7B8, addr2=0x1FFFF7C2)
def config_stm32f070(self):
self.slope = 3.3 / -.004300
cal_adc_30 = self.read16(0x1FFFF7B8) / 4095.
self.base_temperature = self.calc_base(30., cal_adc_30)
def config_stm32g0(self):
cal_adc_30 = self.read16(0x1FFF75A8) * 3.0 / (3.3 * 4095.)
cal_adc_130 = self.read16(0x1FFF75CA) * 3.0 / (3.3 * 4095.)
self.slope = (130. - 30.) / (cal_adc_130 - cal_adc_30)
self.base_temperature = self.calc_base(30., cal_adc_30)
def config_stm32h723(self):
cal_adc_30 = self.read16(0x1FF1E820) / 4095.
cal_adc_130 = self.read16(0x1FF1E840) / 4095.
self.slope = (130. - 30.) / (cal_adc_130 - cal_adc_30)
self.base_temperature = self.calc_base(30., cal_adc_30)
def config_stm32h7(self):
cal_adc_30 = self.read16(0x1FF1E820) / 65535.
cal_adc_110 = self.read16(0x1FF1E840) / 65535.
self.slope = (110. - 30.) / (cal_adc_110 - cal_adc_30)
self.base_temperature = self.calc_base(30., cal_adc_30)
def read16(self, addr):
params = self.debug_read_cmd.send([1, addr])
return params['val']
def read32(self, addr):
params = self.debug_read_cmd.send([2, addr])
return params['val']
def load_config(config):
pheaters = config.get_printer().load_object(config, "heaters")
pheaters.add_sensor_factory("temperature_mcu", PrinterTemperatureMCU)
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