EMC parallel port map(s)

[Brian Pitt <bfp-at-earthlink.net>]

this is info I snipped from all over the place for my notebook
I used a lot of <TABs> so it may not look right in email but they should
pop back into place if pasted into a normal editor
maps are
first port = step/dir+limit/home switches
second port = E-Stop + misc I/O
option phase stepping on first port
----------------------------------------------------------
The original IBM-PC's Parallel Printer Port had a total of 12 digital outputs 
and 5 digital inputs accessed via 3 consecutive 8-bit ports in the 
processor's 
I/O space. 
8 output pins accessed via the DATA Port 
5 input pins (one inverted, indicated by line over number) accessed via the 
STATUS Port 
4 output pins (three inverted, indicated by line over number) accessed via 
the 
CONTROL Port 
The remaining 8 pins are grounded
--------------------------------------------------------------------------------------
EMC first para port map
lpt		lpt
pin 	EMC	bit 	default			default
num	name	name 	use			polarity
1  		/c0
2  		d0	x dir		HOMING_POLARITY = 1
3  		d1	x step
4  		d2	y dir		HOMING_POLARITY = 1
5  		d3	y step
6  		d4	z dir		HOMING_POLARITY = 1
7  		d5	z step
8  		d6
9  		d7
10 		s6
11 		/s7
12 		s5	x,y,z home	HOME_SWITCH_POLARITY = 1
13 		s4	x,y,z limit-	MIN_LIMIT_SWITCH_POLARITY = 1
14 		c1
15 		s3	x,y,z limit+	MAX_LIMIT_SWITCH_POLARITY = 1
16 		c2
17 		/c3
18-25	gnd

------------------------------------------------------------------------------------
EMC second para port map
lpt		lpt
pin 	EMC	bit 	default			default
num	name	name 	use			polarity
inputs	
15 	index 0  s3	
14 	index 1	 s4	ESTOP_SENSE_INDEX	ESTOP_SENSE_POLARITY = 1 
12 	index 2  s5	LUBE_SENSE_INDEX	LUBE_SENSE_POLARITY = 1
10 	index 3  s6	
11 	index 4  /s7	

outputs
2 	index 0  d0	SPINDLE_REVERSE_INDEX	SPINDLE_REVERSE_POLARITY = 0 
3 	index 1  d1	SPINDLE_FORWARD_INDEX 	SPINDLE_FORWARD_POLARITY = 0
4 	index 2  d2	
5 	index 3  d3	
6 	index 4  d4	
7 	index 5  d5	
8 	index 6  d6	MIST_COOLANT_INDEX	MIST_COOLANT_POLARITY = 0	
9 	index 7  d7	FLOOD_COOLANT_INDEX	FLOOD_COOLANT_POLARITY = 0
1 	index 8  /c0 	SPINDLE_DECREASE_INDEX	SPINDLE_DECREASE_POLARITY = 1
14 	index 9  /c1	SPINDLE_INCREASE_INDEX	SPINDLE_INCREASE_POLARITY = 1
16 	index 10 c2	ESTOP_WRITE_INDEX	ESTOP_WRITE_POLARITY = 1
17 	index 11 /c3	SPINDLE_BRAKE_INDEX	SPINDLE_BRAKE_POLARITY = 0
------------------------------------------------------------------------------------
new for phase stepping from Fred Proctor's post

To specify this, just put this in your .ini file:

[EMCMOT]
EMCMOT = freqmod.o
STEPPING_TYPE = 1

It only works for freqmod.o (steppermod.o will come once this is
debugged). If you say 0, or leave it out, it uses step-and-direction.

The wiring looks like this, from a comment in emcmot.c:

  Phases are labeled p13 and p19, from Bridgeport stepper motor driver
  pins 13 and 19. The values are converted from step/direction using the
  following table:

  dir   p13  p19

  |  ^   0    0
  |  |   1    0
  +  -   1    1
  |  |   0    1
  v  |   0    0

  The new value of p13 is the logical result of (p19 != dir), and
  the new value of p19 is the logical result of (p13 == dir), where
  + dir is 1 and - dir is 0.
The bits are "wired" onto the parallel port like this:

  MSB                      low byte                             LSB
  -----------------------------------------------------------------
  | p13-3 | p19-3 | p13-2 | p19-2 | p13-1 | p19-1 | p13-0 | p19-0 |
  -----------------------------------------------------------------

  MSB                       hi byte                             LSB
  -----------------------------------------------------------------
  |   x   |   x   |   x   |   x   | p13-5 | p19-5 | p13-4 | p19-4 |
  -----------------------------------------------------------------

  where p19-0 is pin 19 of axis 0, p13-5 is pin 13 of axis 5, etc.

translates to this pinout/port map (outputs only)
lpt	lpt
pin	bit	EMC	signal	
num	name	name	function
2	 D0	P19-0	motor-0 phase-A
3	 D1	P13-0	motor-0 phase-B
4	 D2	P19-1	motor-1 phase-A
5	 D3	P13-1	motor-1 phase-B
6	 D4	P19-2	motor-2 phase-A
7	 D5	P13-2	motor-2 phase-B
8	 D6	P19-3	motor-3 phase-A
9	 D7	P13-3	motor-3 phase-B
1	/C0	P19-4	motor-4 phase-A
14	/C1	P13-4	motor-4 phase-B
16	 C2	P19-5	motor-5 phase-A
17	/C3	P13-5	motor-5 phase-B

-----------------------------------------------------------------------------
Brian