43c298a7a9
This is a feature to protect your printer from burn up in flames if it has a thermistor coming off place (this happened to a friend of mine recently and motivated me writing this feature). The issue: If a thermistor come off, it will read a lower temperature than actual. The system will turn the heater on forever, burning up the filament and anything else around. After the temperature reaches the target for the first time, this feature will start measuring for how long the current temperature stays below the target minus _HYSTERESIS (set_temperature - THERMAL_RUNAWAY_PROTECTION_HYSTERESIS). If it stays longer than _PERIOD, it means the thermistor temperature cannot catch up with the target, so something *may be* wrong. Then, to be on the safe side, the system will he halt. Bear in mind the count down will just start AFTER the first time the thermistor temperature is over the target, so you will have no problem if your extruder heater takes 2 minutes to hit the target on heating.
182 lines
5 KiB
C
182 lines
5 KiB
C
/*
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temperature.h - temperature controller
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Part of Marlin
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Copyright (c) 2011 Erik van der Zalm
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Grbl is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Grbl is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Grbl. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef temperature_h
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#define temperature_h
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#include "Marlin.h"
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#include "planner.h"
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#ifdef PID_ADD_EXTRUSION_RATE
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#include "stepper.h"
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#endif
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// public functions
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void tp_init(); //initialize the heating
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void manage_heater(); //it is critical that this is called periodically.
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// low level conversion routines
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// do not use these routines and variables outside of temperature.cpp
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extern int target_temperature[EXTRUDERS];
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extern float current_temperature[EXTRUDERS];
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#ifdef SHOW_TEMP_ADC_VALUES
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extern int current_temperature_raw[EXTRUDERS];
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extern int current_temperature_bed_raw;
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#endif
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extern int target_temperature_bed;
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extern float current_temperature_bed;
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#ifdef TEMP_SENSOR_1_AS_REDUNDANT
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extern float redundant_temperature;
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#endif
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#if defined(CONTROLLERFAN_PIN) && CONTROLLERFAN_PIN > -1
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extern unsigned char soft_pwm_bed;
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#endif
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#ifdef PIDTEMP
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extern float Kp,Ki,Kd,Kc;
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float scalePID_i(float i);
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float scalePID_d(float d);
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float unscalePID_i(float i);
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float unscalePID_d(float d);
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#endif
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#ifdef PIDTEMPBED
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extern float bedKp,bedKi,bedKd;
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#endif
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#ifdef BABYSTEPPING
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extern volatile int babystepsTodo[3];
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#endif
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//high level conversion routines, for use outside of temperature.cpp
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//inline so that there is no performance decrease.
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//deg=degreeCelsius
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FORCE_INLINE float degHotend(uint8_t extruder) {
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return current_temperature[extruder];
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};
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#ifdef SHOW_TEMP_ADC_VALUES
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FORCE_INLINE float rawHotendTemp(uint8_t extruder) {
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return current_temperature_raw[extruder];
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};
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FORCE_INLINE float rawBedTemp() {
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return current_temperature_bed_raw;
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};
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#endif
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FORCE_INLINE float degBed() {
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return current_temperature_bed;
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};
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FORCE_INLINE float degTargetHotend(uint8_t extruder) {
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return target_temperature[extruder];
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};
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FORCE_INLINE float degTargetBed() {
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return target_temperature_bed;
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};
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FORCE_INLINE void setTargetHotend(const float &celsius, uint8_t extruder) {
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target_temperature[extruder] = celsius;
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};
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FORCE_INLINE void setTargetBed(const float &celsius) {
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target_temperature_bed = celsius;
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};
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FORCE_INLINE bool isHeatingHotend(uint8_t extruder){
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return target_temperature[extruder] > current_temperature[extruder];
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};
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FORCE_INLINE bool isHeatingBed() {
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return target_temperature_bed > current_temperature_bed;
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};
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FORCE_INLINE bool isCoolingHotend(uint8_t extruder) {
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return target_temperature[extruder] < current_temperature[extruder];
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};
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FORCE_INLINE bool isCoolingBed() {
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return target_temperature_bed < current_temperature_bed;
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};
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#define degHotend0() degHotend(0)
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#define degTargetHotend0() degTargetHotend(0)
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#define setTargetHotend0(_celsius) setTargetHotend((_celsius), 0)
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#define isHeatingHotend0() isHeatingHotend(0)
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#define isCoolingHotend0() isCoolingHotend(0)
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#if EXTRUDERS > 1
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#define degHotend1() degHotend(1)
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#define degTargetHotend1() degTargetHotend(1)
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#define setTargetHotend1(_celsius) setTargetHotend((_celsius), 1)
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#define isHeatingHotend1() isHeatingHotend(1)
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#define isCoolingHotend1() isCoolingHotend(1)
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#else
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#define setTargetHotend1(_celsius) do{}while(0)
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#endif
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#if EXTRUDERS > 2
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#define degHotend2() degHotend(2)
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#define degTargetHotend2() degTargetHotend(2)
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#define setTargetHotend2(_celsius) setTargetHotend((_celsius), 2)
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#define isHeatingHotend2() isHeatingHotend(2)
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#define isCoolingHotend2() isCoolingHotend(2)
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#else
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#define setTargetHotend2(_celsius) do{}while(0)
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#endif
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#if EXTRUDERS > 3
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#error Invalid number of extruders
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#endif
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int getHeaterPower(int heater);
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void disable_heater();
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void setWatch();
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void updatePID();
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#ifdef THERMAL_RUNAWAY_PROTECTION_PERIOD && THERMAL_RUNAWAY_PROTECTION_PERIOD > 0
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void thermal_runaway_protection(int *state, unsigned long *timer, float temperature, float target_temperature, int heater_id, int period_seconds, int hysteresis_degc);
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static int thermal_runaway_state_machine[3]; // = {0,0,0};
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static unsigned long thermal_runaway_timer[3]; // = {0,0,0};
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static bool thermal_runaway = false;
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#if TEMP_SENSOR_BED != 0
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static int thermal_runaway_bed_state_machine;
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static unsigned long thermal_runaway_bed_timer;
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#endif
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#endif
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FORCE_INLINE void autotempShutdown(){
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#ifdef AUTOTEMP
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if(autotemp_enabled)
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{
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autotemp_enabled=false;
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if(degTargetHotend(active_extruder)>autotemp_min)
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setTargetHotend(0,active_extruder);
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}
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#endif
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}
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void PID_autotune(float temp, int extruder, int ncycles);
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#endif
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