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overworked readme

Bernhard Kubicek 13 年之前
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@@ -8,8 +8,9 @@ This RepRap firmware is a mashup between <a href="https://github.com/kliment/Spr
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 Derived from Sprinter and Grbl by Erik van der Zalm.
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 Sprinters lead developers are Kliment and caru.
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 Grbls lead developer is Simen Svale Skogsrud.
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-Some features have been added by and configuration has been added by:
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-Bernhard Kubicek, Matthijs Keuper, Bradley Feldman, and others...
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+A fork by bkubicek for the Ultimaker was merged, and further development was aided by him.
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+Some features have been added by:
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+Lampmaker, Bradley Feldman, and others...
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14 15
 
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 Features:
@@ -20,33 +21,140 @@ Features:
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  - preliminary support for Matthew Roberts advance algorithm 
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    For more info see: http://reprap.org/pipermail/reprap-dev/2011-May/003323.html
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  - Full endstop support
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- - Simple LCD support (16x2)
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  - SD Card support
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- - Provisions for Bernhard Kubicek's new hardware control console and 20x4 lcd
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+ - SD Card folders (works in pronterface)
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+ - LCD support (ideally 20x4) 
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+ - LCD menu system for autonomous SD card printing, controlled by an click-encoder. 
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+ - EEPROM storage of e.g. max-velocity, max-acceleration, and similar variables
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+ - many small but handy things originating from bkubicek's fork.
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+ - Arc support
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+ - Temperature oversampling
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+ - Dynamic Temperature setpointing aka "AutoTemp"
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+ - Support for QTMarlin, a very beta GUI for PID-tuning and velocity-acceleration testing. https://github.com/bkubicek/QTMarlin
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+ - Endstop trigger reporting to the host software.
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+ - Updated sdcardlib
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+ - Heater power reporting. Useful for PID monitoring.
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 This firmware is optimized for Ultimaker's gen6 electronics (including the Ultimaker 1.5.x daughterboard and Arduino Mega 2560).
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-The default baudrate is 115200. 
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+The default baudrate is 250000. This baudrate has less jitter and hence errors than the usual 115200 baud, but is less supported by drivers and host-environments.
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 ========================================================================================
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+Differences and additions to the already good Sprinter firmware:
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+
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+Look-ahead:
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+Marlin has look-ahead. While sprinter has to break and re-accelerate at each corner, 
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+lookahead will only decelerate and accelerate to a velocity, 
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+so that the change in vectorial velocity magnitude is less than the xy_jerk_velocity.
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+This is only possible, if some future moves are already processed, hence the name. 
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+It leads to less over-deposition at corners, especially at flat angles.
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+
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+Arc support: 
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+Splic3r can find curves that, although broken into segments, were ment to describe an arc.
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+Marlin is able to print those arcs. The advantage is the firmware can choose the resolution,
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+and can perform the arc with nearly constant velocity, resulting in a nice finish. 
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+Also, less serial communication is needed.
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+
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+Temperature Oversampling:
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+To reduce noise and make the PID-differential term more useful, 16 ADC conversion results are averaged.
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+
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+AutoTemp:
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+If your gcode contains a wide spread of extruder velocities, or you realtime change the building speed, the temperature should be changed accordingly.
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+Usually, higher speed requires higher temperature.
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+This can now be performed by the AutoTemp function
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+By calling M109 S<mintemp> T<maxtemp> F<factor> you enter the autotemp mode.
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+You can leave it by calling M109 without any F.
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+If active, the maximal extruder stepper rate of all buffered moves will be calculated, and named "maxerate" [steps/sec].
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+The wanted temperature then will be set to t=tempmin+factor*maxerate, while being limited between tempmin and tempmax.
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+If the target temperature is set manually or by gcode to a value less then tempmin, it will be kept without change.
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+Ideally, your gcode can be completely free of temperature controls, apart from a M109 S T F in the start.gcode, and a M109 S0 in the end.gcode.
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+
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+EEPROM:
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+If you know your PID values, the acceleration and max-velocities of your unique machine, you can set them, and finally store them in the EEPROM.
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+After each reboot, it will magically load them from EEPROM, independent what your Configuration.h says.
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+
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+LCD Menu:
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+If your hardware supports it, you can build yourself a LCD-CardReader+Click+encoder combination. It will enable you to realtime tune temperatures,
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+accelerations, velocities, flow rates, select and print files from the SD card, preheat, disable the steppers, and do other fancy stuff.
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+One working hardware is documented here: http://www.thingiverse.com/thing:12663 
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+Also, with just a 20x4 or 16x2 display, useful data is shown.
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+
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+SD card folders:
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+If you have an SD card reader attached to your controller, also folders work now. Listing the files in pronterface will show "/path/subpath/file.g".
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+You can write to file in a subfolder by specifying a similar text using small letters in the path.
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+Also, backup copies of various operating systems are hidden, as well as files not ending with ".g".
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+
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+Endstop trigger reporting:
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+If an endstop is hit while moving towards the endstop, the location at which the firmware thinks that the endstop was triggered is outputed on the serial port.
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+This is useful, because the user gets a warning message.
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+However, also tools like QTMarlin can use this for finding acceptable combinations of velocity+acceleration.
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+
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+Coding paradigm:
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+Not relevant from a user side, but Marlin was split into thematic junks, and has tried to partially enforced private variables.
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+This is intended to make it clearer, what interacts which what, and leads to a higher level of modularization.
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+We think that this is a useful prestep for porting this firmware to e.g. an ARM platform in the future.
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+A lot of RAM (with enabled LCD ~2200 bytes) was saved by storing char []="some message" in Program memory.
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+In the serial communication, a #define based level of abstraction was enforced, so that it is clear that
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+some transfer is information (usually beginning with "echo:"), an error "error:", or just normal protocol,
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+necessary for backwards compatibility.
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+
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+Interrupt based temperature measurements:
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+An interrupt is used to manage ADC conversions, and enforce checking for critical temperatures.
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+This leads to less blocking in the heater management routine.
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+
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+========================================================================================
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+Non-standard M-Codes, different to an old version of sprinter:
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+
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+G2  - CW ARC
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+G3  - CCW ARC
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+
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+General:
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+M17  - Enable/Power all stepper motors
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+M18  - Disable all stepper motors; same as M84
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+M30  - Print time since last M109 or SD card start to serial
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+M42  - Change pin status via gcode
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+M80  - Turn on Power Supply
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+M81  - Turn off Power Supply
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+M114 - Output current position to serial port 
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+M119 - Output Endstop status to serial port
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+Movement variables:
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+M202 - Set max acceleration in units/s^2 for travel moves (M202 X1000 Y1000) Unused in Marlin!!
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+M203 - Set maximum feedrate that your machine can sustain (M203 X200 Y200 Z300 E10000) in mm/sec
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+M204 - Set default acceleration: S normal moves T filament only moves (M204 S3000 T7000) im mm/sec^2  also sets minimum segment time in ms (B20000) to prevent buffer underruns and M20 minimum feedrate
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+M220 - set build speed factor override percentage S:factor in percent ; aka "realtime tuneing in the gcode"
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+M301 - Set PID parameters P I and D
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+M400 - Finish all moves
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+
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+Advance:
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+M200 - Set filament diameter for advance
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+M205 -  advanced settings:  minimum travel speed S=while printing T=travel only,  B=minimum segment time X= maximum xy jerk, Z=maximum Z jerk
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+
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+EEPROM:
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+M500 - stores paramters in EEPROM
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+M501 - reads parameters from EEPROM (if you need reset them after you changed them temporarily).  
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+M502 - reverts to the default "factory settings".  You still need to store them in EEPROM afterwards if you want to.
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+========================================================================================
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+
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+
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 Configuring and compilation
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-Install the latest arduino software IDE/toolset (currently 0022)
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+Install the arduino software IDE/toolset v22
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    http://www.arduino.cc/en/Main/Software
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 Install Ultimaker's RepG 25 build
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     http://software.ultimaker.com
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-(or alternatively install Kliment's printrun/pronterface  https://github.com/kliment/Printrun_)
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+For SD handling and as better substitute (apart from stl manipulation) download
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+the very nice Kliment's printrun/pronterface  https://github.com/kliment/Printrun
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 Copy the Ultimaker Marlin firmware
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-   https:/github.com/bkubicek/Marlin
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+   https://github.com/ErikZalm/Marlin/tree/Marlin_v1
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    (Use the download button)
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 Start the arduino IDE.
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-Select Tools -> Board -> Arduino Mega 2560 
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+Select Tools -> Board -> Arduino Mega 2560    or your microcontroller
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 Select the correct serial port in Tools ->Serial Port
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 Open Marlin.pde
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