overworked readme
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Bernhard Kubicek
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README.md
126
README.md
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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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Features:
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@ -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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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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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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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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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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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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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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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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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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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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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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Non-standard M-Codes, different to an old version of sprinter:
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G2 - CW ARC
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G3 - CCW ARC
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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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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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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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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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