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Improvements and bug fixes in sensor delay buffer for filament sensor code

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Improvement to avoid reinitializing delay buffer with every print. Fixed
issues in buffer indexing and memory out of bounds due to floating point
imprecision.  Simplified the code by avoiding conversion to standard
diameter and 1cu mm extrusion, which caused complications in determining
mm extruded.
2.0.x
Filip Mulier 10 years ago
parent 85649a4549
commit 62db9848d3
4 changed files with 58 additions and 34 deletions
Show Stats Download Patch File Download Diff File

4
Marlin/Marlin.h
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@ -230,8 +230,8 @@ extern unsigned char fanSpeedSoftPwm;
#endif
#ifdef FILAMENT_SENSOR
extern volatile float filament_width_nominal; //holds the theoretical filament diameter ie., 3.00 or 1.75
extern volatile bool filament_sensor; //indicates that filament sensor readings should control extrusion
extern float filament_width_nominal; //holds the theoretical filament diameter ie., 3.00 or 1.75
extern bool filament_sensor; //indicates that filament sensor readings should control extrusion
extern float filament_width_meas; //holds the filament diameter as accurately measured
extern signed char measurement_delay[]; //ring buffer to delay measurement
extern int delay_index1, delay_index2; //index into ring buffer

38
Marlin/Marlin_main.cpp
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@ -302,12 +302,12 @@ bool cancel_heatup = false ;
#ifdef FILAMENT_SENSOR
//Variables for Filament Sensor input
volatile float filament_width_nominal=DEFAULT_NOMINAL_FILAMENT_DIA; //Set nominal filament width, can be changed with M404
volatile bool filament_sensor=false; //M405 turns on filament_sensor control, M406 turns it off
float filament_width_nominal=DEFAULT_NOMINAL_FILAMENT_DIA; //Set nominal filament width, can be changed with M404
bool filament_sensor=false; //M405 turns on filament_sensor control, M406 turns it off
float filament_width_meas=DEFAULT_MEASURED_FILAMENT_DIA; //Stores the measured filament diameter
signed char measurement_delay[MAX_MEASUREMENT_DELAY+1]; //ring buffer to delay measurement store extruder factor after subtracting 100
int delay_index1=0;
int delay_index2=0; //index into ring buffer
int delay_index1=0; //index into ring buffer
int delay_index2=-1; //index into ring buffer - set to -1 on startup to indicate ring buffer needs to be initialized
float delay_dist=0; //delay distance counter
int meas_delay_cm = MEASUREMENT_DELAY_CM; //distance delay setting
#endif
@ -504,6 +504,7 @@ void servo_init()
#endif
}
void setup()
{
setup_killpin();
@ -553,6 +554,7 @@ void setup()
st_init(); // Initialize stepper, this enables interrupts!
setup_photpin();
servo_init();
lcd_init();
_delay_ms(1000); // wait 1sec to display the splash screen
@ -2333,12 +2335,8 @@ void process_commands()
}
} else {
//reserved for setting filament diameter via UFID or filament measuring device
if(active_extruder == FILAMENT_SENSOR_EXTRUDER_NUM){
radius = analog2widthFil() * 0.5;
area = M_PI * pow(radius, 2);
}else{
area = 1.0;
}
break;
}
tmp_extruder = active_extruder;
@ -2816,15 +2814,19 @@ case 404: //M404 Enter the nominal filament width (3mm, 1.75mm ) N<3.0> or disp
if(meas_delay_cm> MAX_MEASUREMENT_DELAY)
meas_delay_cm = MAX_MEASUREMENT_DELAY;
if(delay_index2 == -1) //initialize the ring buffer if it has not been done since startup
{
int temp_ratio = widthFil_to_size_ratio();
for (delay_index1=0; delay_index1<(MAX_MEASUREMENT_DELAY+1); ++delay_index1 ){
measurement_delay[delay_index1]=temp_ratio-100; //subtract 100 to scale within a signed byte
}
delay_index1=0;
delay_index2=0;
}
filament_sensor = true ;
int temp_ratio = widthFil_to_size_ratio();
for (delay_index1=0; delay_index1<(MAX_MEASUREMENT_DELAY+1); ++delay_index1 ){
measurement_delay[delay_index1]=temp_ratio-100; //subtract 100 to scale within a signed byte
}
delay_index1=0;
delay_index2=0;
//SERIAL_PROTOCOLPGM("Filament dia (measured mm):");
//SERIAL_PROTOCOL(filament_width_meas);
//SERIAL_PROTOCOLPGM("Extrusion ratio(%):");
@ -2841,7 +2843,7 @@ case 404: //M404 Enter the nominal filament width (3mm, 1.75mm ) N<3.0> or disp
case 407: //M407 Display measured filament diameter
{
filament_width_meas = code_value();
SERIAL_PROTOCOLPGM("Filament dia (measured mm):");
SERIAL_PROTOCOLLN(filament_width_meas);

28
Marlin/planner.cpp
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@ -743,15 +743,25 @@ block->steps_y = labs((target[X_AXIS]-position[X_AXIS]) - (target[Y_AXIS]-positi
#ifdef FILAMENT_SENSOR
//FMM update ring buffer used for delay with filament measurements
if(filament_sensor && (extruder==0)) //only for extruder 0
if((extruder==FILAMENT_SENSOR_EXTRUDER_NUM) && (delay_index2 > -1)) //only for extruder with filament sensor and if ring buffer is initialized
{
delay_dist = delay_dist + delta_mm[E_AXIS]; //increment counter with next move in e axis
if (delay_dist> (10*(MAX_MEASUREMENT_DELAY+1))) //check if counter is over max buffer size in mm
while (delay_dist >= (10*(MAX_MEASUREMENT_DELAY+1))) //check if counter is over max buffer size in mm
delay_dist = delay_dist - 10*(MAX_MEASUREMENT_DELAY+1); //loop around the buffer
if(delay_dist<0)
while (delay_dist<0)
delay_dist = delay_dist + 10*(MAX_MEASUREMENT_DELAY+1); //loop around the buffer
delay_index1=delay_dist/10; //calculate index
delay_index1=delay_dist/10.0; //calculate index
//ensure the number is within range of the array after converting from floating point
if(delay_index1<0)
delay_index1=0;
else if (delay_index1>MAX_MEASUREMENT_DELAY)
delay_index1=MAX_MEASUREMENT_DELAY;
if(delay_index1 != delay_index2) //moved index
{
meas_sample=widthFil_to_size_ratio()-100; //subtract off 100 to reduce magnitude - to store in a signed char
@ -761,10 +771,16 @@ block->steps_y = labs((target[X_AXIS]-position[X_AXIS]) - (target[Y_AXIS]-positi
delay_index2 = delay_index2 + 1;
if(delay_index2>MAX_MEASUREMENT_DELAY)
delay_index2=delay_index2-(MAX_MEASUREMENT_DELAY+1); //loop around buffer when incrementing
if(delay_index2<0)
delay_index2=0;
else if (delay_index2>MAX_MEASUREMENT_DELAY)
delay_index2=MAX_MEASUREMENT_DELAY;
measurement_delay[delay_index2]=meas_sample;
}
}
}
#endif

22
Marlin/temperature.cpp
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@ -617,9 +617,16 @@ void manage_heater()
meas_shift_index = meas_shift_index + (MAX_MEASUREMENT_DELAY+1); //loop around buffer if needed
//get the delayed info and add 100 to reconstitute to a percent of the nominal filament diameter
//then adjust as a factor to the Standard Diameter (has an area of 1mm squared)
//then square it to get an area
volumetric_multiplier[FILAMENT_SENSOR_EXTRUDER_NUM] = pow((float)(100+measurement_delay[meas_shift_index])/filament_width_nominal*STANDARD_DIA/100.0,2);
if(meas_shift_index<0)
meas_shift_index=0;
else if (meas_shift_index>MAX_MEASUREMENT_DELAY)
meas_shift_index=MAX_MEASUREMENT_DELAY;
volumetric_multiplier[FILAMENT_SENSOR_EXTRUDER_NUM] = pow((float)(100+measurement_delay[meas_shift_index])/100.0,2);
if (volumetric_multiplier[FILAMENT_SENSOR_EXTRUDER_NUM] <0.01)
volumetric_multiplier[FILAMENT_SENSOR_EXTRUDER_NUM]=0.01;
}
#endif
}
@ -715,6 +722,9 @@ static void updateTemperaturesFromRawValues()
#ifdef TEMP_SENSOR_1_AS_REDUNDANT
redundant_temperature = analog2temp(redundant_temperature_raw, 1);
#endif
#ifdef FILAMENT_SENSOR && (FILWIDTH_PIN > -1) //check if a sensor is supported
filament_width_meas = analog2widthFil();
#endif
//Reset the watchdog after we know we have a temperature measurement.
watchdog_reset();
@ -731,15 +741,11 @@ return current_raw_filwidth/16383.0*5.0;
//return current_raw_filwidth;
}
// For converting raw Filament Width to an volumetric ratio
// For converting raw Filament Width to a ratio
int widthFil_to_size_ratio() {
float temp;
#if (FILWIDTH_PIN > -1) //check if a sensor is supported
filament_width_meas=current_raw_filwidth/16383.0*5.0;
#endif
temp=filament_width_meas;
if(filament_width_meas<MEASURED_LOWER_LIMIT)
temp=filament_width_nominal; //assume sensor cut out

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