HOME_POS is now always where the endstop is and can be outside the limits.
The limits are now defined by MIN_POS and MAX_POS rather than HOME_POS and MAX_LENGTH.
The Z is axis now homed first if direction is away from the bed.

Saguinololu limit pins change from MIN to MAX according to the homing direction.

Open Hardware board currently used by the group build of http://tvrrug.org.uk
The board can be found at http://solderpad.com/folknology/open-motion-controller/

Signed-off-by: Michel Pollet <buserror@gmail.com>

M303 Starts autotune. Wait till the Kp Ki and Kd constants are printed.
Put these values in Configuration.h

This simplifies wiring for those with RAMPS 1.3 and 1.4 boards.

Instead of adding a momentary switch to fake the insertion of the card I have modified the ultralcd menu item:

Card Menu -> Refresh

to reinitialise the card providing that the SDCARDDETECT pin has been set to -1 in the pins.h file.  This requires one less switch on the front panel and the refresh menu item is in the most relevent place for a user who wishes to inert a card and then print from it.

It also means that the "Card inserted" messages do not bother the users of these card readers (they dont make sense for users without SCCARDDETECT)

Changed the way the extruder pins are defined so it doesn't create extra -1 entries in the list.

V1.4 moves thermistor power to the always-on 5v line.
The BOGUS_TEMPERATURE_FAILSAFE_OVERRIDE is no longer
needed on this board.  Add a new motherboard type to
support this feature.

The code to ignore the "bad thermistor reading failsafe"
suicide function depends on the existing of the PS_ON pin
feature.  But in some boards this shouldn't be the case
Fix this by adding an explicit definition to make our
intentions more clear and separable.

The Z_MAX_PIN value was defined as no-value, but this causes
the compile to fail.  Fix this by setting the Z_MAX_PIN to the
correct value (which happens to be 0 for pin PB0/DIO0/0).

Split ramps1.3 in Sprinter like config and multiextruder config.

that pulls down the SDCARDDETECT pin and mimicking the pull and reinsert ofa a SD card

- Added support for ATMega1284

Needs some work to remove the blocking in read max6675.

Added late z enable. (blddk request)
Only calculate look ahead if >2 moves in buffer.
Removed some FORCE_INLINE to save memory.

Signed-off-by: Erik van der Zalm <erik@vdzalm.eu>

advance and ultipanel not any more in default config

Soft PWM. (Sanguinololu can also have PID temperature control)
Interrupt save WRITE for addresses > 0x0FF

- The temperature control is pretty much complete
  (not sure what to do w/ autotemp though)
  Changed the pins assignment to clearly separate bed and extruder heaters
  and temp sensors, changed a bit how termistor tables are handled.
- The steppers control is rudimentary
  (only chanages what pins it uses depending on the active_extruder var,
   but that's enough for switching extruder in the start.gcode in the
   the profiles)
- Tested only w/ RAMPS 1.4