This function should only be used with sled, not all bed auto
levelling.

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.

chdkActive was set to false regardless of (millis() - chdkHigh) being bigger than the CHDK_DELAY or not. So if (millis() - chdkHigh) wasn't bigger than the delay the first time, the CHDK would never be set back to LOW.

Also, don't return from the function, as there might be other stuff to do, after the CHDK check.

Z_PROBE_REPEATABILITY test for Auto Bed Leveling.
Implemented as M48 with extra user specified options.
Full support at
http://3dprintboard.com/showthread.php?2802-Auto_Bed_Leveling-Z-Probe-Repeatability-code

This feature allows the printer to read the filament diameter
automatically and adjust the printer in real time.  Added code to read
an analog voltage that represents a filament diameter measurement.  This
measurement is delayed in a ring buffer to compensate for sensors that
are a distance away from the extruder.  The measurement is used to
adjust the volumetric_multiplier for the extruder.  Some additional g
codes (M404, M405, M406, M407) are used to set parameters and turn
on/off the control. g code M221 is updated.  Pins for RAMPS1.4, RAMBO,
and Printrboard are identified for analog input.  The configuration file
is updated with relevant user parameters.

Positioning of string terminator to truncate checksum from the commands
M23, M28, M30, M32, M928 and M117 was off by one, causing the last
letter of the actual command to be truncated instead of just the
checksum.

In case of the SD commands this caused checksummed commands targeting
existing files to fail since the last letter of the filename was
truncated.

In case of M117 this caused the last given letter not to be displayed.

This patch fixes the off-by-one error and sets the null terminator
on the exact position of the * starting the checksum instead of the
character before that.

Fixes #817

sorry for that

FW retraction is extended onto swap retraction invoked by 'G10 S1'.
Bookkeeping of the retract state of all extruders allows for having one
extruder fw standard retracted while another extruder is swap retracted.
An LCD menu item for the swap retract and recover length was added.

===================================================
Hi,

Please find the latest report on new defect(s) introduced to ErikZalm/Marlin found with Coverity Scan.

Defect(s) Reported-by: Coverity Scan
Showing 15 of 15 defect(s)

** CID 59629:  Unchecked return value  (CHECKED_RETURN)
/Marlin_main.cpp: 2154 in process_commands()()

** CID 59630:  Operands don't affect result  (CONSTANT_EXPRESSION_RESULT)
/Applications/Arduino.app/Contents/Resources/Java/hardware/arduino/cores/arduino/Tone.cpp: 319 in tone(unsigned char, unsigned int, unsigned long)()

** CID 59631:  Missing break in switch  (MISSING_BREAK)
/Marlin_main.cpp: 1187 in process_commands()()

** CID 59632:  Missing break in switch  (MISSING_BREAK)
/Marlin_main.cpp: 1193 in process_commands()()

** CID 59633:  Out-of-bounds write  (OVERRUN)
/temperature.cpp: 914 in disable_heater()()

** CID 59634:  Out-of-bounds write  (OVERRUN)
/temperature.cpp: 913 in disable_heater()()

** CID 59635:  Out-of-bounds read  (OVERRUN)
/temperature.cpp: 626 in analog2temp(int, unsigned char)()

** CID 59636:  Out-of-bounds read  (OVERRUN)
/temperature.cpp: 620 in analog2temp(int, unsigned char)()

** CID 59637:  Out-of-bounds write  (OVERRUN)
/temperature.cpp: 202 in PID_autotune(float, int, int)()

** CID 59638:  Out-of-bounds read  (OVERRUN)
/temperature.cpp: 214 in PID_autotune(float, int, int)()

** CID 59639:  Out-of-bounds write  (OVERRUN)
/Marlin_main.cpp: 2278 in process_commands()()

** CID 59640:  Out-of-bounds read  (OVERRUN)
/Marlin_main.cpp: 1802 in process_commands()()

** CID 59641:  Uninitialized scalar field  (UNINIT_CTOR)
/Applications/Arduino.app/Contents/Resources/Java/libraries/LiquidCrystal/LiquidCrystal.cpp: 51 in LiquidCrystal::LiquidCrystal(unsigned char, unsigned char, unsigned char, unsigned char, unsigned char, unsigned char)()

** CID 59642:  Uninitialized scalar field  (UNINIT_CTOR)
/Applications/Arduino.app/Contents/Resources/Java/libraries/LiquidCrystal/LiquidCrystal.cpp: 45 in LiquidCrystal::LiquidCrystal(unsigned char, unsigned char, unsigned char, unsigned char, unsigned char, unsigned char, unsigned char)()

** CID 59643:  Uninitialized scalar field  (UNINIT_CTOR)
/Applications/Arduino.app/Contents/Resources/Java/libraries/LiquidCrystal/LiquidCrystal.cpp: 32 in LiquidCrystal::LiquidCrystal(unsigned char, unsigned char, unsigned char, unsigned char, unsigned char, unsigned char, unsigned char, unsigned char, unsigned char, unsigned char, unsigned char)()

________________________________________________________________________________________________________
*** CID 59629:  Unchecked return value  (CHECKED_RETURN)
/Marlin_main.cpp: 2154 in process_commands()()
2148                 }
2149               #endif
2150             }
2151           }
2152           break;
2153         case 85: // M85
   CID 59629:  Unchecked return value  (CHECKED_RETURN)
   Calling "code_seen" without checking return value (as is done elsewhere 66 out of 67 times).
2154           code_seen('S');
2155           max_inactive_time = code_value() * 1000;
2156           break;
2157         case 92: // M92
2158           for(int8_t i=0; i < NUM_AXIS; i++)
2159           {

________________________________________________________________________________________________________
*** CID 59630:  Operands don't affect result  (CONSTANT_EXPRESSION_RESULT)
/Applications/Arduino.app/Contents/Resources/Java/hardware/arduino/cores/arduino/Tone.cpp: 319 in tone(unsigned char, unsigned int, unsigned long)()
313         else
314         {
315           // two choices for the 16 bit timers: ck/1 or ck/64
316           ocr = F_CPU / frequency / 2 - 1;
317
318           prescalarbits = 0b001;
   CID 59630:  Operands don't affect result  (CONSTANT_EXPRESSION_RESULT)
   "ocr > 65535U" is always false regardless of the values of its operands. This occurs as the logical operand of if.
319           if (ocr > 0xffff)
320           {
321             ocr = F_CPU / frequency / 2 / 64 - 1;
322             prescalarbits = 0b011;
323           }
324

________________________________________________________________________________________________________
*** CID 59631:  Missing break in switch  (MISSING_BREAK)
/Marlin_main.cpp: 1187 in process_commands()()
1181         case 2: // G2  - CW ARC
1182           if(Stopped == false) {
1183             get_arc_coordinates();
1184             prepare_arc_move(true);
1185             return;
1186           }
   CID 59631:  Missing break in switch  (MISSING_BREAK)
   The above case falls through to this one.
1187         case 3: // G3  - CCW ARC
1188           if(Stopped == false) {
1189             get_arc_coordinates();
1190             prepare_arc_move(false);
1191             return;
1192           }

________________________________________________________________________________________________________
*** CID 59632:  Missing break in switch  (MISSING_BREAK)
/Marlin_main.cpp: 1193 in process_commands()()
1187         case 3: // G3  - CCW ARC
1188           if(Stopped == false) {
1189             get_arc_coordinates();
1190             prepare_arc_move(false);
1191             return;
1192           }
   CID 59632:  Missing break in switch  (MISSING_BREAK)
   The above case falls through to this one.
1193         case 4: // G4 dwell
1194           LCD_MESSAGEPGM(MSG_DWELL);
1195           codenum = 0;
1196           if(code_seen('P')) codenum = code_value(); // milliseconds to wait
1197           if(code_seen('S')) codenum = code_value() * 1000; // seconds to wait
1198

________________________________________________________________________________________________________
*** CID 59633:  Out-of-bounds write  (OVERRUN)
/temperature.cpp: 914 in disable_heater()()
908          WRITE(HEATER_0_PIN,LOW);
909        #endif
910       #endif
911
912       #if defined(TEMP_1_PIN) && TEMP_1_PIN > -1
913         target_temperature[1]=0;
   CID 59633:  Out-of-bounds write  (OVERRUN)
   Overrunning array "soft_pwm" of 1 bytes at byte offset 1 using index "1".
914         soft_pwm[1]=0;
915         #if defined(HEATER_1_PIN) && HEATER_1_PIN > -1
916           WRITE(HEATER_1_PIN,LOW);
917         #endif
918       #endif
919

________________________________________________________________________________________________________
*** CID 59634:  Out-of-bounds write  (OVERRUN)
/temperature.cpp: 913 in disable_heater()()
907        #if defined(HEATER_0_PIN) && HEATER_0_PIN > -1
908          WRITE(HEATER_0_PIN,LOW);
909        #endif
910       #endif
911
912       #if defined(TEMP_1_PIN) && TEMP_1_PIN > -1
   CID 59634:  Out-of-bounds write  (OVERRUN)
   Overrunning array "target_temperature" of 1 2-byte elements at element index 1 (byte offset 2) using index "1".
913         target_temperature[1]=0;
914         soft_pwm[1]=0;
915         #if defined(HEATER_1_PIN) && HEATER_1_PIN > -1
916           WRITE(HEATER_1_PIN,LOW);
917         #endif
918       #endif

________________________________________________________________________________________________________
*** CID 59635:  Out-of-bounds read  (OVERRUN)
/temperature.cpp: 626 in analog2temp(int, unsigned char)()
620       if(heater_ttbl_map[e] != NULL)
621       {
622         float celsius = 0;
623         uint8_t i;
624         short (*tt)[][2] = (short (*)[][2])(heater_ttbl_map[e]);
625
   CID 59635:  Out-of-bounds read  (OVERRUN)
   Overrunning array "heater_ttbllen_map" of 1 bytes at byte offset 1 using index "e" (which evaluates to 1).
626         for (i=1; i<heater_ttbllen_map[e]; i++)
627         {
628           if (PGM_RD_W((*tt)[i][0]) > raw)
629           {
630             celsius = PGM_RD_W((*tt)[i-1][1]) +
631               (raw - PGM_RD_W((*tt)[i-1][0])) *

________________________________________________________________________________________________________
*** CID 59636:  Out-of-bounds read  (OVERRUN)
/temperature.cpp: 620 in analog2temp(int, unsigned char)()
614         if (e == 0)
615         {
616           return 0.25 * raw;
617         }
618       #endif
619
   CID 59636:  Out-of-bounds read  (OVERRUN)
   Overrunning array "heater_ttbl_map" of 1 2-byte elements at element index 1 (byte offset 2) using index "e" (which evaluates to 1).
620       if(heater_ttbl_map[e] != NULL)
621       {
622         float celsius = 0;
623         uint8_t i;
624         short (*tt)[][2] = (short (*)[][2])(heater_ttbl_map[e]);
625

________________________________________________________________________________________________________
*** CID 59637:  Out-of-bounds write  (OVERRUN)
/temperature.cpp: 202 in PID_autotune(float, int, int)()
196       {
197          soft_pwm_bed = (MAX_BED_POWER)/2;
198          bias = d = (MAX_BED_POWER)/2;
199        }
200        else
201        {
   CID 59637:  Out-of-bounds write  (OVERRUN)
   Overrunning array "soft_pwm" of 1 bytes at byte offset 1 using index "extruder" (which evaluates to 1).
202          soft_pwm[extruder] = (PID_MAX)/2;
203          bias = d = (PID_MAX)/2;
204       }
205
206
207

________________________________________________________________________________________________________
*** CID 59638:  Out-of-bounds read  (OVERRUN)
/temperature.cpp: 214 in PID_autotune(float, int, int)()
208
209      for(;;) {
210
211         if(temp_meas_ready == true) { // temp sample ready
212           updateTemperaturesFromRawValues();
213
   CID 59638:  Out-of-bounds read  (OVERRUN)
   Overrunning array "current_temperature" of 1 4-byte elements at element index 1 (byte offset 4) using index "extruder" (which evaluates to 1).
214           input = (extruder<0)?current_temperature_bed:current_temperature[extruder];
215
216           max=max(max,input);
217           min=min(min,input);
218           if(heating == true && input > temp) {
219             if(millis() - t2 > 5000) {

________________________________________________________________________________________________________
*** CID 59639:  Out-of-bounds write  (OVERRUN)
/Marlin_main.cpp: 2278 in process_commands()()
2272               tmp_extruder = code_value();
2273               if(tmp_extruder >= EXTRUDERS) {
2274                 SERIAL_ECHO_START;
2275                 SERIAL_ECHO(MSG_M200_INVALID_EXTRUDER);
2276               }
2277             }
   CID 59639:  Out-of-bounds write  (OVERRUN)
   Overrunning array "volumetric_multiplier" of 1 4-byte elements at element index 1 (byte offset 4) using index "tmp_extruder" (which evaluates to 1).
2278             volumetric_multiplier[tmp_extruder] = 1 / area;
2279           }
2280           break;
2281         case 201: // M201
2282           for(int8_t i=0; i < NUM_AXIS; i++)
2283           {

________________________________________________________________________________________________________
*** CID 59640:  Out-of-bounds read  (OVERRUN)
/Marlin_main.cpp: 1802 in process_commands()()
1796             int pin_status = code_value();
1797             int pin_number = LED_PIN;
1798             if (code_seen('P') && pin_status >= 0 && pin_status <= 255)
1799               pin_number = code_value();
1800             for(int8_t i = 0; i < (int8_t)sizeof(sensitive_pins); i++)
1801             {
   CID 59640:  Out-of-bounds read  (OVERRUN)
   Overrunning array "sensitive_pins" of 28 2-byte elements at element index 55 (byte offset 110) using index "i" (which evaluates to 55).
1802               if (sensitive_pins[i] == pin_number)
1803               {
1804                 pin_number = -1;
1805                 break;
1806               }
1807             }

________________________________________________________________________________________________________
*** CID 59641:  Uninitialized scalar field  (UNINIT_CTOR)
/Applications/Arduino.app/Contents/Resources/Java/libraries/LiquidCrystal/LiquidCrystal.cpp: 51 in LiquidCrystal::LiquidCrystal(unsigned char, unsigned char, unsigned char, unsigned char, unsigned char, unsigned char)()
45     }
46
47     LiquidCrystal::LiquidCrystal(uint8_t rs,  uint8_t enable,
48     			     uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3)
49     {
50       init(1, rs, 255, enable, d0, d1, d2, d3, 0, 0, 0, 0);
   CID 59641:  Uninitialized scalar field  (UNINIT_CTOR)
   Non-static class member "_initialized" is not initialized in this constructor nor in any functions that it calls.
51     }
52
53     void LiquidCrystal::init(uint8_t fourbitmode, uint8_t rs, uint8_t rw, uint8_t enable,
54     			 uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3,
55     			 uint8_t d4, uint8_t d5, uint8_t d6, uint8_t d7)
56     {

________________________________________________________________________________________________________
*** CID 59642:  Uninitialized scalar field  (UNINIT_CTOR)
/Applications/Arduino.app/Contents/Resources/Java/libraries/LiquidCrystal/LiquidCrystal.cpp: 45 in LiquidCrystal::LiquidCrystal(unsigned char, unsigned char, unsigned char, unsigned char, unsigned char, unsigned char, unsigned char)()
39     }
40
41     LiquidCrystal::LiquidCrystal(uint8_t rs, uint8_t rw, uint8_t enable,
42     			     uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3)
43     {
44       init(1, rs, rw, enable, d0, d1, d2, d3, 0, 0, 0, 0);
   CID 59642:  Uninitialized scalar field  (UNINIT_CTOR)
   Non-static class member "_initialized" is not initialized in this constructor nor in any functions that it calls.
45     }
46
47     LiquidCrystal::LiquidCrystal(uint8_t rs,  uint8_t enable,
48     			     uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3)
49     {
50       init(1, rs, 255, enable, d0, d1, d2, d3, 0, 0, 0, 0);

________________________________________________________________________________________________________
*** CID 59643:  Uninitialized scalar field  (UNINIT_CTOR)
/Applications/Arduino.app/Contents/Resources/Java/libraries/LiquidCrystal/LiquidCrystal.cpp: 32 in LiquidCrystal::LiquidCrystal(unsigned char, unsigned char, unsigned char, unsigned char, unsigned char, unsigned char, unsigned char, unsigned char, unsigned char, unsigned char, unsigned char)()
26
27     LiquidCrystal::LiquidCrystal(uint8_t rs, uint8_t rw, uint8_t enable,
28     			     uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3,
29     			     uint8_t d4, uint8_t d5, uint8_t d6, uint8_t d7)
30     {
31       init(0, rs, rw, enable, d0, d1, d2, d3, d4, d5, d6, d7);
   CID 59643:  Uninitialized scalar field  (UNINIT_CTOR)
   Non-static class member "_initialized" is not initialized in this constructor nor in any functions that it calls.
32     }
33
34     LiquidCrystal::LiquidCrystal(uint8_t rs, uint8_t enable,
35     			     uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3,
36     			     uint8_t d4, uint8_t d5, uint8_t d6, uint8_t d7)
37     {

________________________________________________________________________________________________________
To view the defects in Coverity Scan visit, http://scan.coverity.com/projects/2224?tab=overview

Added description of autotemp flags to M109

Speed up the diagonal move while still keeping each individual axis at
or below its homing feedrate.

some guy find that marlin not working good for dual extruders delta .
when type T0 or T1 to active extruder and  E0 or E1  move causing XYZ
motion . so i locales the bugs and fix it , I have dry run the fix.

Extension of M221, Tune menu

Firmware retraction now stores the retract and recover speeds in mm/s
instead of mm/min. This makes it match the units of the maximum
feedrate, and fixes problems with modifying the value via LCD control
panel. From gcode, the values are still taken in mm/min to match the
units of G1 and similar, and they are converted to mm/s before they are
stored.

I also lowered the default retract feedrate to make it less likely to
cause problems for geared extruders when the user hasn’t bothered to
set a reasonable maximum feedrate, though users should be setting both
of these values to suit their hardware.

Added CHDK support to take pictures instead of doing an IR command, see more about how to use it here http://captain-slow.dk/2014/03/09/3d-printing-timelapses/

I made these changes previously, but I can’t find the commit now. This
reapplies the changes to get auto retract working again.

Conflicts:
	Marlin/Configuration_adv.h
	Marlin/Marlin_main.cpp

If position is unknown, then G29 can be dangerous.