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Initial import of CVS-v2_8_branch
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Fred Gleason
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docs/GPIO.txt
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docs/GPIO.txt
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GPIO Notes for Rivendell
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Rivendell supports the following General Purpose Input/Output (GPIO)
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devices:
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Gameport Joystick Buttons
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USB Joystick Buttons
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Measurement Computing PCI-PDIS08 Board
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Measurement Computing PCI-PDIS16 Board
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Measurement Computing PCI-DIO24 Board
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Several supported switcher devices feature GPIO capabiities as well,
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see the file 'SWITCHERS.txt' for more info.
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JOYSTICK DEVICES
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Joystick support utilizes the Linux Input Device subsystem. Inputs
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are active-low, and should be wired as follows:
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02: Input 1
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04: Ground
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07: Input 2
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05: Ground
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10: Input 3
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12: Ground
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14: Input 4
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12: Ground
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In addition, you will need to connect 47 kohm resistors between the
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following pins: 1-3, 6-8, 9-11 and 13-15. While not strictly needed
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for the GPI portion of the interface to work, the kernel's analog
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joystick driver will refuse to initialize the port if these resistors
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(or a real joystick) are not present.
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The device name of the joystick will be one of the /dev/input/event<n>
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devices.
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NOTE: There have been reports that some port models do not internally
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connect pin 12 to ground. The symptom of this situation will be that
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Inputs 1 and 2 work, but not Inputs 3 and 4. If this is the case,
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connecting the ground for Inputs 3 and 4 to pins 04 or 05 should remedy
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the problem.
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MEASUREMENT COMPUTER GPIO BOARDS
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To configure one of the supported MeasurementComputing GPIO boards,
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proceed as follows:
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1) Install the card(s) in the computer. In the case of the PCI-DIO24,
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two cards may be necessary, as each seperate card is entirely
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utilized as either inputs or outputs.
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2) Test it out. Two programs exist for this purpose: 'gpitest' tests
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GPI inputs, and 'gpotest' tests GPO outputs. These programs come
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with the 'libradio' package.
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3) Define a GPIO device in RDAdmin->Stations->Switcher/GPIO. Use
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a device type of 'Local GPIO'.
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-----------------------------------------------------------------------------
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GPIO BOARD-SPECIFIC NOTES
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The Measurement Computing PCI-PDIS08 and PCI-PDIS16 boards feature
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floating, opto-isolated inputs. The inputs are not polarity sensitive
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and may be driven by either AC or DC. The outputs are electro-mechanical
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relays with dry contacts. Connector pinouts are as follows:
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PCI-PDIS08 -- DB37 Male Connector
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PCI-PDIS16 -- DB37 Male Connector (using C50F-37F Cable)
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Pin Signal
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----------------
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1 Input 8/16
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20 Input 8/16
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2 Input 7/15
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21 Input 7/15
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3 Input 6/14
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22 Input 6/14
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4 Input 5/13
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23 Input 5/13
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5 Input 4/12
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24 Input 4/12
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6 Input 3/11
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25 Input 3/11
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7 Input 2/10
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26 Input 2/10
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8 Input 1/9
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27 Input 1/9
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9 Output 8/16 C
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28 Output 8/16 N/O
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10 Output 7/15 C
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29 Output 7/15 N/O
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11 Output 6/14 C
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30 Output 6/14 N/O
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12 Output 5/13 N/C
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13 Output 5/13 N/O
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31 Output 5/13 C
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14 Output 4/12 C
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32 Output 4/12 N/C
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33 Output 4/12 N/O
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15 Output 3/11 N/C
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16 Output 3/11 N/O
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34 Output 3/11 C
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17 Output 2/10 C
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35 Output 2/10 N/C
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36 Output 2/10 N/O
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18 Output 1/9 N/C
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19 Output 1/9 N/O
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37 Output 1/9 C
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----------------------
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C = Common
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N/O = Normally Open
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N/C = Normally Closed
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-----------------------------------------------------------------------------
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The Measurement Computing PCI-DIO24 board features TTL logic-level
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connections, which can be configured to operate either as inputs or
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outputs. Connector pinouts are as follows:
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PCI-DIO24 -- DB37 Male Connector
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Pin Signal
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---------------------
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37 Input/Output 1
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36 Input/Output 2
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35 Input/Output 3
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34 Input/Output 4
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33 Input/Output 5
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32 Input/Output 6
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31 Input/Output 7
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30 Input/Output 8
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10 Input/Output 9
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9 Input/Output 10
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8 Input/Output 11
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7 Input/Output 12
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6 Input/Output 13
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5 Input/Output 14
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4 Input/Output 15
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3 Input/Output 16
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29 Input/Output 17
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28 Input/Output 18
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27 Input/Output 19
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26 Input/Output 20
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25 Input/Output 21
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24 Input/Output 22
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23 Input/Output 23
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22 Input/Output 24
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11 Ground
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13 Ground
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15 Ground
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17 Ground
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19 Ground
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21 Ground
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18 +5 VDC
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20 +5 VDC
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16 +12 VDC
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14 -12 VDC
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WARNING: The +5 VDC, +12 VDC and -12 VDC pins are connected directly to
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the power supply buss of the host PC. Improper use of these pins can
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cause serious damage to your computer!
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-----------------------------------------------------------------------------
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