format readme.
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Bernhard Kubicek
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README.md
59
README.md
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@ -14,26 +14,26 @@ Lampmaker, Bradley Feldman, and others...
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Features:
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- Interrupt based movement with real linear acceleration
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- High steprate
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- Look ahead (Keep the speed high when possible. High cornering speed)
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- Interrupt based temperature protection
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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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- SD Card support
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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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* Interrupt based movement with real linear acceleration
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* High steprate
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* Look ahead (Keep the speed high when possible. High cornering speed)
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* Interrupt based temperature protection
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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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* SD Card support
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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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@ -42,8 +42,10 @@ The default baudrate is 250000. This baudrate has less jitter and hence errors t
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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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-----------
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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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@ -51,6 +53,7 @@ This is only possible, if some future moves are already processed, hence the nam
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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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------------
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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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@ -60,10 +63,12 @@ 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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---------
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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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@ -71,26 +76,31 @@ If the target temperature is set manually or by gcode to a value less then tempm
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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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-------
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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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---------
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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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----------------
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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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--------------------------
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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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----------------
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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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@ -100,12 +110,13 @@ some transfer is information (usually beginning with "echo:"), an error "error:"
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necessary for backwards compatibility.
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Interrupt based temperature measurements:
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-----------------------------------------
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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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==============================================================
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G2 - CW ARC
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G3 - CCW ARC
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@ -135,10 +146,8 @@ 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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Configuring and compilation:
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============================
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Install the arduino software IDE/toolset v22
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