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Added PID autotune. (experimental) 

M303 Starts autotune. Wait till the Kp Ki and Kd constants are printed.
Put these values in Configuration.h
pull/1/head
Erik van der Zalm 12 years ago
parent
116dc86b8a
commit
c077316b2b
5 changed files with 274 additions and 169 deletions
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  1. 8
      Marlin/Marlin.pde
  2. 2
      Marlin/pins.h
  3. 89
      Marlin/temperature.cpp
  4. 325
      Marlin/temperature.h
  5. 19
      Marlin/ultralcd.pde

8
Marlin/Marlin.pde
View File

@ -109,6 +109,7 @@
// M501 - reads parameters from EEPROM (if you need reset them after you changed them temporarily).
// M502 - reverts to the default "factory settings". You still need to store them in EEPROM afterwards if you want to.
// M503 - print the current settings (from memory not from eeprom)
// M303 - PID relay autotune S<temperature> sets the target temperature. (default target temperature = 150C)
//Stepper Movement Variables
@ -1197,6 +1198,13 @@ void process_commands()
allow_cold_extrudes(true);
}
break;
case 303: // M303 PID autotune
{
float temp = 150.0;
if (code_seen('S')) temp=code_value();
PID_autotune(temp);
}
break;
case 400: // finish all moves
{
st_synchronize();

2
Marlin/pins.h
View File

@ -734,7 +734,7 @@
#define encrot2 3
#define encrot3 1
#define SDCARDDETECT -1
//bits in the shift register that carry the buttons for:
// left up center down right red
#define BL_LE 7

89
Marlin/temperature.cpp
View File

@ -62,7 +62,7 @@ int current_raw_bed = 0;
//===========================================================================
//=============================private variables============================
//===========================================================================
static bool temp_meas_ready = false;
static volatile bool temp_meas_ready = false;
static unsigned long previous_millis_bed_heater;
//static unsigned long previous_millis_heater;
@ -132,7 +132,94 @@ static unsigned long previous_millis_bed_heater;
//===========================================================================
//============================= functions ============================
//===========================================================================
void PID_autotune(float temp)
{
float input;
int cycles=0;
bool heating = true;
soft_pwm[0] = 255>>1;
unsigned long temp_millis = millis();
unsigned long t1=temp_millis;
unsigned long t2=temp_millis;
long t_high;
long t_low;
long bias=127;
long d = 127;
float Ku, Tu;
float Kp, Ki, Kd;
float max, min;
SERIAL_ECHOLN("PID Autotune start");
for(;;) {
if(temp_meas_ready == true) { // temp sample ready
CRITICAL_SECTION_START;
temp_meas_ready = false;
CRITICAL_SECTION_END;
input = analog2temp(current_raw[0], 0);
max=max(max,input);
min=min(min,input);
if(heating == true && input > temp) {
if(millis() - t2 > 5000) {
heating=false;
soft_pwm[0] = (bias - d) >> 1;
t1=millis();
t_high=t1 - t2;
max=temp;
}
}
if(heating == false && input < temp) {
if(millis() - t1 > 5000) {
heating=true;
t2=millis();
t_low=t2 - t1;
if(cycles > 0) {
bias += (d*(t_high - t_low))/(t_low + t_high);
bias = constrain(bias, 20 ,235);
if(bias > 127) d = 254 - bias;
else d = bias;
SERIAL_PROTOCOLPGM(" bias: "); SERIAL_PROTOCOL(bias);
SERIAL_PROTOCOLPGM(" d: "); SERIAL_PROTOCOL(d);
SERIAL_PROTOCOLPGM(" min: "); SERIAL_PROTOCOL(min);
SERIAL_PROTOCOLPGM(" max: "); SERIAL_PROTOCOLLN(max);
if(cycles > 2) {
Ku = (4.0*d)/(3.14159*(max-min)/2.0);
Tu = ((float)(t_low + t_high)/1000.0);
Kp = 0.6*Ku;
Ki = 2*Kp/Tu;
Kd = Kp*Tu/8;
SERIAL_PROTOCOLPGM(" Kp: "); SERIAL_PROTOCOLLN(Kp);
SERIAL_PROTOCOLPGM(" Ki: "); SERIAL_PROTOCOLLN(Ki);
SERIAL_PROTOCOLPGM(" Kd: "); SERIAL_PROTOCOLLN(Kd);
}
}
soft_pwm[0] = (bias + d) >> 1;
cycles++;
min=temp;
}
}
}
if(input > (temp + 20)) {
SERIAL_PROTOCOLLNPGM("PID Autotune failed !!!, Temperature to high");
return;
}
if(millis() - temp_millis > 2000) {
temp_millis = millis();
SERIAL_PROTOCOLPGM("ok T:");
SERIAL_PROTOCOL(degHotend(0));
SERIAL_PROTOCOLPGM(" @:");
SERIAL_PROTOCOLLN(getHeaterPower(0));
}
LCD_STATUS;
}
}
void updatePID()
{
#ifdef PIDTEMP

325
Marlin/temperature.h
View File

@ -1,162 +1,165 @@
/*
temperature.h - temperature controller
Part of Marlin
Copyright (c) 2011 Erik van der Zalm
Grbl is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Grbl is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Grbl. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef temperature_h
#define temperature_h
#include "Marlin.h"
#include "planner.h"
#ifdef PID_ADD_EXTRUSION_RATE
#include "stepper.h"
#endif
// public functions
void tp_init(); //initialise the heating
void manage_heater(); //it is critical that this is called periodically.
//low leven conversion routines
// do not use this routines and variables outsie of temperature.cpp
int temp2analog(int celsius, uint8_t e);
int temp2analogBed(int celsius);
float analog2temp(int raw, uint8_t e);
float analog2tempBed(int raw);
extern int target_raw[EXTRUDERS];
extern int heatingtarget_raw[EXTRUDERS];
extern int current_raw[EXTRUDERS];
extern int target_raw_bed;
extern int current_raw_bed;
#ifdef BED_LIMIT_SWITCHING
extern int target_bed_low_temp ;
extern int target_bed_high_temp ;
#endif
extern float Kp,Ki,Kd,Kc;
#ifdef PIDTEMP
extern float pid_setpoint[EXTRUDERS];
#endif
// #ifdef WATCHPERIOD
extern int watch_raw[EXTRUDERS] ;
// extern unsigned long watchmillis;
// #endif
//high level conversion routines, for use outside of temperature.cpp
//inline so that there is no performance decrease.
//deg=degreeCelsius
FORCE_INLINE float degHotend(uint8_t extruder) {
return analog2temp(current_raw[extruder], extruder);
};
FORCE_INLINE float degBed() {
return analog2tempBed(current_raw_bed);
};
FORCE_INLINE float degTargetHotend(uint8_t extruder) {
return analog2temp(target_raw[extruder], extruder);
};
FORCE_INLINE float degTargetBed() {
return analog2tempBed(target_raw_bed);
};
FORCE_INLINE void setTargetHotend(const float &celsius, uint8_t extruder) {
target_raw[extruder] = temp2analog(celsius, extruder);
#ifdef PIDTEMP
pid_setpoint[extruder] = celsius;
#endif //PIDTEMP
};
FORCE_INLINE void setTargetBed(const float &celsius) {
target_raw_bed = temp2analogBed(celsius);
#ifdef BED_LIMIT_SWITCHING
if(celsius>BED_HYSTERESIS)
{
target_bed_low_temp= temp2analogBed(celsius-BED_HYSTERESIS);
target_bed_high_temp= temp2analogBed(celsius+BED_HYSTERESIS);
}
else
{
target_bed_low_temp=0;
target_bed_high_temp=0;
}
#endif
};
FORCE_INLINE bool isHeatingHotend(uint8_t extruder){
return target_raw[extruder] > current_raw[extruder];
};
FORCE_INLINE bool isHeatingBed() {
return target_raw_bed > current_raw_bed;
};
FORCE_INLINE bool isCoolingHotend(uint8_t extruder) {
return target_raw[extruder] < current_raw[extruder];
};
FORCE_INLINE bool isCoolingBed() {
return target_raw_bed < current_raw_bed;
};
#define degHotend0() degHotend(0)
#define degTargetHotend0() degTargetHotend(0)
#define setTargetHotend0(_celsius) setTargetHotend((_celsius), 0)
#define isHeatingHotend0() isHeatingHotend(0)
#define isCoolingHotend0() isCoolingHotend(0)
#if EXTRUDERS > 1
#define degHotend1() degHotend(1)
#define degTargetHotend1() degTargetHotend(1)
#define setTargetHotend1(_celsius) setTargetHotend((_celsius), 1)
#define isHeatingHotend1() isHeatingHotend(1)
#define isCoolingHotend1() isCoolingHotend(1)
#endif
#if EXTRUDERS > 2
#define degHotend2() degHotend(2)
#define degTargetHotend2() degTargetHotend(2)
#define setTargetHotend2(_celsius) setTargetHotend((_celsius), 2)
#define isHeatingHotend2() isHeatingHotend(2)
#define isCoolingHotend2() isCoolingHotend(2)
#endif
#if EXTRUDERS > 3
#error Invalid number of extruders
#endif
int getHeaterPower(int heater);
void disable_heater();
void setWatch();
void updatePID();
FORCE_INLINE void autotempShutdown(){
#ifdef AUTOTEMP
if(autotemp_enabled)
{
autotemp_enabled=false;
if(degTargetHotend(ACTIVE_EXTRUDER)>autotemp_min)
setTargetHotend(0,ACTIVE_EXTRUDER);
}
#endif
}
#endif
/*
temperature.h - temperature controller
Part of Marlin
Copyright (c) 2011 Erik van der Zalm
Grbl is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Grbl is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Grbl. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef temperature_h
#define temperature_h
#include "Marlin.h"
#include "planner.h"
#ifdef PID_ADD_EXTRUSION_RATE
#include "stepper.h"
#endif
// public functions
void tp_init(); //initialise the heating
void manage_heater(); //it is critical that this is called periodically.
//low leven conversion routines
// do not use this routines and variables outsie of temperature.cpp
int temp2analog(int celsius, uint8_t e);
int temp2analogBed(int celsius);
float analog2temp(int raw, uint8_t e);
float analog2tempBed(int raw);
extern int target_raw[EXTRUDERS];
extern int heatingtarget_raw[EXTRUDERS];
extern int current_raw[EXTRUDERS];
extern int target_raw_bed;
extern int current_raw_bed;
#ifdef BED_LIMIT_SWITCHING
extern int target_bed_low_temp ;
extern int target_bed_high_temp ;
#endif
extern float Kp,Ki,Kd,Kc;
#ifdef PIDTEMP
extern float pid_setpoint[EXTRUDERS];
#endif
// #ifdef WATCHPERIOD
extern int watch_raw[EXTRUDERS] ;
// extern unsigned long watchmillis;
// #endif
//high level conversion routines, for use outside of temperature.cpp
//inline so that there is no performance decrease.
//deg=degreeCelsius
FORCE_INLINE float degHotend(uint8_t extruder) {
return analog2temp(current_raw[extruder], extruder);
};
FORCE_INLINE float degBed() {
return analog2tempBed(current_raw_bed);
};
FORCE_INLINE float degTargetHotend(uint8_t extruder) {
return analog2temp(target_raw[extruder], extruder);
};
FORCE_INLINE float degTargetBed() {
return analog2tempBed(target_raw_bed);
};
FORCE_INLINE void setTargetHotend(const float &celsius, uint8_t extruder) {
target_raw[extruder] = temp2analog(celsius, extruder);
#ifdef PIDTEMP
pid_setpoint[extruder] = celsius;
#endif //PIDTEMP
};
FORCE_INLINE void setTargetBed(const float &celsius) {
target_raw_bed = temp2analogBed(celsius);
#ifdef BED_LIMIT_SWITCHING
if(celsius>BED_HYSTERESIS)
{
target_bed_low_temp= temp2analogBed(celsius-BED_HYSTERESIS);
target_bed_high_temp= temp2analogBed(celsius+BED_HYSTERESIS);
}
else
{
target_bed_low_temp=0;
target_bed_high_temp=0;
}
#endif
};
FORCE_INLINE bool isHeatingHotend(uint8_t extruder){
return target_raw[extruder] > current_raw[extruder];
};
FORCE_INLINE bool isHeatingBed() {
return target_raw_bed > current_raw_bed;
};
FORCE_INLINE bool isCoolingHotend(uint8_t extruder) {
return target_raw[extruder] < current_raw[extruder];
};
FORCE_INLINE bool isCoolingBed() {
return target_raw_bed < current_raw_bed;
};
#define degHotend0() degHotend(0)
#define degTargetHotend0() degTargetHotend(0)
#define setTargetHotend0(_celsius) setTargetHotend((_celsius), 0)
#define isHeatingHotend0() isHeatingHotend(0)
#define isCoolingHotend0() isCoolingHotend(0)
#if EXTRUDERS > 1
#define degHotend1() degHotend(1)
#define degTargetHotend1() degTargetHotend(1)
#define setTargetHotend1(_celsius) setTargetHotend((_celsius), 1)
#define isHeatingHotend1() isHeatingHotend(1)
#define isCoolingHotend1() isCoolingHotend(1)
#endif
#if EXTRUDERS > 2
#define degHotend2() degHotend(2)
#define degTargetHotend2() degTargetHotend(2)
#define setTargetHotend2(_celsius) setTargetHotend((_celsius), 2)
#define isHeatingHotend2() isHeatingHotend(2)
#define isCoolingHotend2() isCoolingHotend(2)
#endif
#if EXTRUDERS > 3
#error Invalid number of extruders
#endif
int getHeaterPower(int heater);
void disable_heater();
void setWatch();
void updatePID();
FORCE_INLINE void autotempShutdown(){
#ifdef AUTOTEMP
if(autotemp_enabled)
{
autotemp_enabled=false;
if(degTargetHotend(ACTIVE_EXTRUDER)>autotemp_min)
setTargetHotend(0,ACTIVE_EXTRUDER);
}
#endif
}
void PID_autotune(float temp);
#endif

19
Marlin/ultralcd.pde
View File

@ -315,19 +315,18 @@ void MainMenu::showStatus()
static int olddegHotEnd0=-1;
static int oldtargetHotEnd0=-1;
//force_lcd_update=true;
if(force_lcd_update||feedmultiplychanged) //initial display of content
if(force_lcd_update) //initial display of content
{
feedmultiplychanged=false;
encoderpos=feedmultiply;
clear();
lcd.setCursor(0,0);lcdprintPGM("\002123/567\001 ");
lcd.setCursor(0,0);lcdprintPGM("\002---/---\001 ");
#if defined BED_USES_THERMISTOR || defined BED_USES_AD595
lcd.setCursor(10,0);lcdprintPGM("B123/567\001 ");
lcd.setCursor(10,0);lcdprintPGM("B---/---\001 ");
#endif
}
int tHotEnd0=intround(degHotend0());
if((abs(tHotEnd0-olddegHotEnd0)>1)||force_lcd_update) //>1 because otherwise the lcd is refreshed to often.
if((tHotEnd0!=olddegHotEnd0)||force_lcd_update)
{
lcd.setCursor(1,0);
lcd.print(ftostr3(tHotEnd0));
@ -379,8 +378,15 @@ void MainMenu::showStatus()
lcdprintPGM("Z:");lcd.print(ftostr52(current_position[2]));
oldzpos=currentz;
}
static int oldfeedmultiply=0;
int curfeedmultiply=feedmultiply;
if(feedmultiplychanged == true) {
feedmultiplychanged == false;
encoderpos = curfeedmultiply;
}
if(encoderpos!=curfeedmultiply||force_lcd_update)
{
curfeedmultiply=encoderpos;
@ -391,12 +397,14 @@ void MainMenu::showStatus()
feedmultiply=curfeedmultiply;
encoderpos=curfeedmultiply;
}
if((curfeedmultiply!=oldfeedmultiply)||force_lcd_update)
{
oldfeedmultiply=curfeedmultiply;
lcd.setCursor(0,2);
lcd.print(itostr3(curfeedmultiply));lcdprintPGM("% ");
}
if(messagetext[0]!='\0')
{
lcd.setCursor(0,LCD_HEIGHT-1);
@ -404,7 +412,6 @@ void MainMenu::showStatus()
uint8_t n=strlen(messagetext);
for(int8_t i=0;i<LCD_WIDTH-n;i++)
lcd.print(" ");
messagetext[0]='\0';
}

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