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=GPIO Notes for Rivendell=

Rivendell supports the following General Purpose Input/Output (GPIO)
devices:

Gameport Joystick Buttons

USB Joystick Buttons

Measurement Computing PCI-PDIS08 Board (Only in systems with old Kernels)

Measurement Computing PCI-PDIS16 Board (Only in systems with old Kernels)

Measurement Computing PCI-DIO24 Board (Only in systems with old Kernels)

Several supported switcher devices feature GPIO capabiities as well, see the file '''SWITCHERS.txt''' for more info.

==JOYSTICK DEVICES==
Joystick support utilizes the Linux Input Device subsystem. Inputs are active-low, and should be wired as follows:
<pre>
02: Input 1
04: Ground

07: Input 2
05: Ground

10: Input 3
12: Ground

14: Input 4
12: Ground</pre>

In addition, you will need to connect 47 kohm resistors between the following pins: 1-3, 6-8, 9-11 and 13-15. While not strictly needed for the GPI portion of the interface to work, the kernel's analog joystick driver will refuse to initialize the port if these resistors (or a real joystick) are not present.

The device name of the joystick will be one of the '''/dev/input/event<n>''' devices.

'''NOTE: There have been reports that some port models do not internally connect pin 12 to ground. The symptom of this situation will be that Inputs 1 and 2 work, but not Inputs 3 and 4. If this is the case, connecting the ground for Inputs 3 and 4 to pins 04 or 05 should remedy the problem.
'''

==MEASUREMENT COMPUTER GPIO BOARDS==
To configure one of the supported Measurement Computing GPIO boards, proceed as follows:

1) Install the card(s) in the computer. In the case of the PCI-DIO24,two cards may be necessary, as each seperate card is entirely utilized as either inputs or outputs.

2) Test it out. <s>Two programs exist for this purpose: '''gpitest''' tests GPI inputs, and '''gpotest''' tests GPO outputs. These programs come with the 'libradio' package.</s> '''NB There is now one program rdgpimon.'''

3) Define a GPIO device in '''RDAdmin->Stations->Switcher/GPIO'''. Use a device type of '''Local GPIO'''.

-----------------------------------------------------------------------------

==GPIO BOARD-SPECIFIC NOTES== (NB These only work with old Kernels)

The Measurement Computing PCI-PDIS08 and PCI-PDIS16 boards feature floating, opto-isolated inputs. The inputs are not polarity sensitive and may be driven by either AC or DC. The outputs are electro-mechanical relays with dry contacts. Connector pinouts are as follows:

===PCI-PDIS08 -- DB37 Male Connector===

===PCI-PDIS16 -- DB37 Male Connector (using C50F-37F Cable)===
<pre>
Pin Signal
----------------
1 Input 8/16
20 Input 8/16

2 Input 7/15
21 Input 7/15

3 Input 6/14
22 Input 6/14

4 Input 5/13
23 Input 5/13

5 Input 4/12
24 Input 4/12

6 Input 3/11
25 Input 3/11

7 Input 2/10
26 Input 2/10

8 Input 1/9
27 Input 1/9

9 Output 8/16 C
28 Output 8/16 N/O

10 Output 7/15 C
29 Output 7/15 N/O

11 Output 6/14 C
30 Output 6/14 N/O

12 Output 5/13 N/C
13 Output 5/13 N/O
31 Output 5/13 C

14 Output 4/12 C
32 Output 4/12 N/C
33 Output 4/12 N/O

15 Output 3/11 N/C
16 Output 3/11 N/O
34 Output 3/11 C

17 Output 2/10 C
35 Output 2/10 N/C
36 Output 2/10 N/O

18 Output 1/9 N/C
19 Output 1/9 N/O

37 Output 1/9 C
----------------------
C = Common
N/O = Normally Open
N/C = Normally Closed</pre>

-----------------------------------------------------------------------------

The Measurement Computing PCI-DIO24 board features TTL logic-level connections, which can be configured to operate either as inputs or outputs. Connector pinouts are as follows:

===PCI-DIO24 -- DB37 Male Connector===
<pre>
Pin Signal
---------------------
37 Input/Output 1
36 Input/Output 2
35 Input/Output 3
34 Input/Output 4
33 Input/Output 5
32 Input/Output 6
31 Input/Output 7
30 Input/Output 8
10 Input/Output 9
9 Input/Output 10
8 Input/Output 11
7 Input/Output 12
6 Input/Output 13
5 Input/Output 14
4 Input/Output 15
3 Input/Output 16
29 Input/Output 17
28 Input/Output 18
27 Input/Output 19
26 Input/Output 20
25 Input/Output 21
24 Input/Output 22
23 Input/Output 23
22 Input/Output 24

11 Ground
13 Ground
15 Ground
17 Ground
19 Ground
21 Ground

18 +5 VDC
20 +5 VDC

16 +12 VDC

14 -12 VDC</pre>

'''WARNING: The +5 VDC, +12 VDC and -12 VDC pins are connected directly to the power supply buss of the host PC. Improper use of these pins can cause serious damage to your computer!'''

= Other GPIO wiki pages =

[[RDGpiMon|RDGpiMon - GUI Utility Program for monitoring GPI and GPO status]]

[[Troubleshooting_GPIs_and_GPOs|Troubleshooting GPIs and GPOs from the command line]]

GPIO.txt - GPIO Notes for Rivendell - Revision history

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