This is the Revision A verion of the
In8 RoboBrick. The status of this project is
that it has been
replaced by the
InOut10 RoboBrick.
In8 Robobrick (Revision A)
This document is also available as a
PDF document.
The In8 RoboBrick allows you to read up to 8 digital
inputs. An interrupt can be generated on the states
of selected inptus.
A picture of the In8-A RoboBrick is shown below:
The basic operation is to send a query to the
In8 RoboBrick to read the 4 bits of data.
The programmer can download a complement
mask to cause any of the bits to be complemented
prior to reading.
The In8 RoboBrick supports
RoboBrick Interrupt Protocol.
The interrupt pending bit is set whenever the
the formula:
L&(~I) | H&I | R&(~P)&I | F&P&(~I)]
is non-zero, where:
-
I is the current input bits XOR'ed with the
complement mask (C)
-
P is the previous value of I
-
L is the low mask
-
H is the high mask
-
R is the raising mask
-
F is the falling mask
and
-
~ is bit-wise complement
-
| is bit-wise OR
-
& is bit-wise AND
Once the interrupt pending bit is set, it must be
explicitly cleared by the user.
The In8 RoboBrick supports both the standard
shared commands and the
shared interrupt commands in addition to the
following commands:
| Command |
Send/
Receive |
Byte Value |
Discussion |
| 7 |
6 |
5 |
4 |
3 |
2 |
1 |
0 |
| Read Inputs |
Send |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
Return input values abcdefgh
(after XOR'ing with complement mask) |
| Receive |
a |
b |
c |
d |
e |
f |
g |
h |
| Read Complement Mask |
Send |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
1 |
Return complement mask cccccccc |
| Receive |
c |
c |
c |
c |
c |
c |
c |
c |
| Read Low Mask |
Send |
0 |
0 |
0 |
0 |
0 |
0 |
1 |
0 |
Return low mask llllllll |
| Receive |
l |
l |
l |
l |
l |
l |
l |
l |
| Read High Mask |
Send |
0 |
0 |
0 |
0 |
0 |
0 |
1 |
1 |
Return high mask hhhhhhhh |
| Receive |
h |
h |
h |
h |
h |
h |
h |
h |
| Read Raising Mask |
Send |
0 |
0 |
0 |
0 |
0 |
1 |
0 |
0 |
Return raising mask rrrrrrrr |
| Receive |
r |
r |
r |
r |
r |
r |
r |
r |
| Read Falling Mask |
Send |
0 |
0 |
0 |
0 |
0 |
1 |
0 |
1 |
Return falling mask ffffffff |
| Receive |
f |
f |
f |
f |
f |
f |
f |
f |
| Read Raw |
Send |
0 |
0 |
0 |
0 |
1 |
0 |
0 |
0 |
Return raw data abcd
(without XOR'ing with complement mask) |
| Receive |
a |
b |
c |
d |
e |
f |
g |
h |
| Set Complement Mask |
Send |
0 |
0 |
0 |
0 |
1 |
0 |
0 |
1 |
Set complement mask to cccccccc |
| Send |
c |
c |
c |
c |
c |
c |
c |
c |
| Set Low Mask |
Send |
0 |
0 |
0 |
0 |
1 |
0 |
1 |
0 |
Set low mask to llllllll |
| Send |
l |
l |
l |
l |
l |
l |
l |
l |
| Set High Mask |
Send |
0 |
0 |
0 |
0 |
1 |
0 |
1 |
1 |
Set high mask to hhhhhhhh |
| Send |
h |
h |
h |
h |
h |
h |
h |
h |
| Set Raising Mask |
Send |
0 |
0 |
0 |
0 |
1 |
1 |
0 |
0 |
Set raising mask to rrrrrrrr |
| Send |
r |
r |
r |
r |
r |
r |
r |
r |
| Set Falling Mask |
Send |
0 |
0 |
0 |
0 |
1 |
1 |
0 |
1 |
Set falling mask to ffffffff |
| Send |
f |
f |
f |
f |
f |
f |
f |
f |
| Read Interrupt Bits |
Send |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |
Return the interrupt pending bit p
and the interrupt enable bit e. |
| Receive |
0 |
0 |
0 |
0 |
0 |
0 |
e |
p |
|
Set Interrupt Commands |
Send |
1 |
1 |
1 |
1 |
0 |
c |
c |
c |
Set Interrupt Command ccc. |
|
Shared Commands |
Send |
1 |
1 |
1 |
1 |
1 |
c |
c |
c |
Execute Shared Command ccc. |
The hardware consists of a circuit schematic and
a printed circuit board.
The schematic for the In8 RoboBrick is shown below:
The parts list kept in a separate file --
in8.ptl.
The printed circuit board files are listed below:
-
in8_back.png
-
The solder side layer.
-
in8_front.png
-
The component side layer.
-
in8_artwork.png
-
x The artwork layer.
-
in8.gbl
-
The RS-274X "Gerber" back (solder side) layer.
-
in8.gtl
-
The RS-274X "Gerber" top (component side) layer.
-
in8.gal
-
The RS-274X "Gerber" artwork layer.
-
in8.drl
-
The "Excellon" NC drill file.
-
in8.tol
-
The "Excellon" tool rack file.
The In8 software is available as one of:
-
in8.ucl
-
The µCL source file.
-
in8.asm
-
The resulting human readable PIC assembly file.
-
in8.lst
-
The resulting human readable PIC listing file.
-
in8.hex
-
The resulting Intel® Hex file
that can be fed into a PIC12C5xx programmer.
In addition, there is a test suite available as:
-
in8_test.ucl
-
The µCL source file.
-
in8_test.asm
-
The resulting human readable PIC assembly file.
-
in8_test.lst
-
The resulting human readable PIC listing file.
-
in8_test.hex
-
The resulting Intel® Hex file
that can be fed into a PIC12C5xx programmer.
The following issues have come up:
-
The 2200 µF capacitor does not fit between
the RJ11 and the terminal strip.
-
One of the traces has an unnecessary kink in it.
-
The 8-pin terminal strip is too close to the
the 74LS151.
-
The terminal strip holes are too small.
-
The Lego holes are not right.
-
The RJ11 holes are not right.
-
We need to switch over to a 6-wire RJ11 connector.
Copyright (c) 2000-2002 by
Wayne C. Gramlich.
All rights reserved.