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even more format.

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Bernhard Kubicek 13 years ago
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  1. 85
      README.md

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README.md
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@ -47,26 +47,26 @@ The default baudrate is 250000. This baudrate has less jitter and hence errors t
Differences and additions to the already good Sprinter firmware: Differences and additions to the already good Sprinter firmware:
================================================================ ================================================================
Look-ahead: *Look-ahead:*
-----------
Marlin has look-ahead. While sprinter has to break and re-accelerate at each corner, Marlin has look-ahead. While sprinter has to break and re-accelerate at each corner,
lookahead will only decelerate and accelerate to a velocity, lookahead will only decelerate and accelerate to a velocity,
so that the change in vectorial velocity magnitude is less than the xy_jerk_velocity. so that the change in vectorial velocity magnitude is less than the xy_jerk_velocity.
This is only possible, if some future moves are already processed, hence the name. This is only possible, if some future moves are already processed, hence the name.
It leads to less over-deposition at corners, especially at flat angles. It leads to less over-deposition at corners, especially at flat angles.
Arc support: *Arc support:*
------------
Splic3r can find curves that, although broken into segments, were ment to describe an arc. Splic3r can find curves that, although broken into segments, were ment to describe an arc.
Marlin is able to print those arcs. The advantage is the firmware can choose the resolution, Marlin is able to print those arcs. The advantage is the firmware can choose the resolution,
and can perform the arc with nearly constant velocity, resulting in a nice finish. and can perform the arc with nearly constant velocity, resulting in a nice finish.
Also, less serial communication is needed. Also, less serial communication is needed.
Temperature Oversampling: *Temperature Oversampling:*
To reduce noise and make the PID-differential term more useful, 16 ADC conversion results are averaged. To reduce noise and make the PID-differential term more useful, 16 ADC conversion results are averaged.
AutoTemp: *AutoTemp:*
---------
If your gcode contains a wide spread of extruder velocities, or you realtime change the building speed, the temperature should be changed accordingly. If your gcode contains a wide spread of extruder velocities, or you realtime change the building speed, the temperature should be changed accordingly.
Usually, higher speed requires higher temperature. Usually, higher speed requires higher temperature.
This can now be performed by the AutoTemp function This can now be performed by the AutoTemp function
@ -78,32 +78,32 @@ The wanted temperature then will be set to t=tempmin+factor*maxerate, while bein
If the target temperature is set manually or by gcode to a value less then tempmin, it will be kept without change. If the target temperature is set manually or by gcode to a value less then tempmin, it will be kept without change.
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. 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.
EEPROM: *EEPROM:*
-------
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. 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.
After each reboot, it will magically load them from EEPROM, independent what your Configuration.h says. After each reboot, it will magically load them from EEPROM, independent what your Configuration.h says.
LCD Menu: *LCD Menu:*
---------
If your hardware supports it, you can build yourself a LCD-CardReader+Click+encoder combination. It will enable you to realtime tune temperatures, If your hardware supports it, you can build yourself a LCD-CardReader+Click+encoder combination. It will enable you to realtime tune temperatures,
accelerations, velocities, flow rates, select and print files from the SD card, preheat, disable the steppers, and do other fancy stuff. accelerations, velocities, flow rates, select and print files from the SD card, preheat, disable the steppers, and do other fancy stuff.
One working hardware is documented here: http://www.thingiverse.com/thing:12663 One working hardware is documented here: http://www.thingiverse.com/thing:12663
Also, with just a 20x4 or 16x2 display, useful data is shown. Also, with just a 20x4 or 16x2 display, useful data is shown.
SD card folders: *SD card folders:*
----------------
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". 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".
You can write to file in a subfolder by specifying a similar text using small letters in the path. You can write to file in a subfolder by specifying a similar text using small letters in the path.
Also, backup copies of various operating systems are hidden, as well as files not ending with ".g". Also, backup copies of various operating systems are hidden, as well as files not ending with ".g".
Endstop trigger reporting: *Endstop trigger reporting:*
--------------------------
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. 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.
This is useful, because the user gets a warning message. This is useful, because the user gets a warning message.
However, also tools like QTMarlin can use this for finding acceptable combinations of velocity+acceleration. However, also tools like QTMarlin can use this for finding acceptable combinations of velocity+acceleration.
Coding paradigm: *Coding paradigm:*
----------------
Not relevant from a user side, but Marlin was split into thematic junks, and has tried to partially enforced private variables. Not relevant from a user side, but Marlin was split into thematic junks, and has tried to partially enforced private variables.
This is intended to make it clearer, what interacts which what, and leads to a higher level of modularization. This is intended to make it clearer, what interacts which what, and leads to a higher level of modularization.
We think that this is a useful prestep for porting this firmware to e.g. an ARM platform in the future. We think that this is a useful prestep for porting this firmware to e.g. an ARM platform in the future.
@ -112,41 +112,46 @@ In the serial communication, a #define based level of abstraction was enforced,
some transfer is information (usually beginning with "echo:"), an error "error:", or just normal protocol, some transfer is information (usually beginning with "echo:"), an error "error:", or just normal protocol,
necessary for backwards compatibility. necessary for backwards compatibility.
Interrupt based temperature measurements: *Interrupt based temperature measurements:*
-----------------------------------------
An interrupt is used to manage ADC conversions, and enforce checking for critical temperatures. An interrupt is used to manage ADC conversions, and enforce checking for critical temperatures.
This leads to less blocking in the heater management routine. This leads to less blocking in the heater management routine.
Non-standard M-Codes, different to an old version of sprinter: Non-standard M-Codes, different to an old version of sprinter:
============================================================== ==============================================================
G2 - CW ARC * G2 - CW ARC
G3 - CCW ARC * G3 - CCW ARC
General: General:
M17 - Enable/Power all stepper motors
M18 - Disable all stepper motors; same as M84 * M17 - Enable/Power all stepper motors
M30 - Print time since last M109 or SD card start to serial * M18 - Disable all stepper motors; same as M84
M42 - Change pin status via gcode * M30 - Print time since last M109 or SD card start to serial
M80 - Turn on Power Supply * M42 - Change pin status via gcode
M81 - Turn off Power Supply * M80 - Turn on Power Supply
M114 - Output current position to serial port * M81 - Turn off Power Supply
M119 - Output Endstop status to serial port * M114 - Output current position to serial port
* M119 - Output Endstop status to serial port
Movement variables: Movement variables:
M202 - Set max acceleration in units/s^2 for travel moves (M202 X1000 Y1000) Unused in Marlin!!
M203 - Set maximum feedrate that your machine can sustain (M203 X200 Y200 Z300 E10000) in mm/sec * M202 - Set max acceleration in units/s^2 for travel moves (M202 X1000 Y1000) Unused in Marlin!!
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 * M203 - Set maximum feedrate that your machine can sustain (M203 X200 Y200 Z300 E10000) in mm/sec
M220 - set build speed factor override percentage S:factor in percent ; aka "realtime tuneing in the gcode" * 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
M301 - Set PID parameters P I and D * M220 - set build speed factor override percentage S:factor in percent ; aka "realtime tuneing in the gcode"
M400 - Finish all moves * M301 - Set PID parameters P I and D
* M400 - Finish all moves
Advance: Advance:
M200 - Set filament diameter for advance
M205 - advanced settings: minimum travel speed S=while printing T=travel only, B=minimum segment time X= maximum xy jerk, Z=maximum Z jerk * M200 - Set filament diameter for advance
* M205 - advanced settings: minimum travel speed S=while printing T=travel only, B=minimum segment time X= maximum xy jerk, Z=maximum Z jerk
EEPROM: EEPROM:
M500 - stores paramters in EEPROM * M500 - stores paramters in EEPROM
M501 - reads parameters from EEPROM (if you need reset them after you changed them temporarily). * M501 - reads parameters from EEPROM (if you need reset them after you changed them temporarily).
M502 - reverts to the default "factory settings". You still need to store them in EEPROM afterwards if you want to. * M502 - reverts to the default "factory settings". You still need to store them in EEPROM afterwards if you want to.
Configuring and compilation: Configuring and compilation:
============================ ============================

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