The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/Documentation/bt8xxgpio.txt

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    1 ===============================================================
    2 ==  BT8XXGPIO driver                                         ==
    3 ==                                                           ==
    4 ==  A driver for a selfmade cheap BT8xx based PCI GPIO-card  ==
    5 ==                                                           ==
    6 ==  For advanced documentation, see                          ==
    7 ==  http://www.bu3sch.de/btgpio.php                          ==
    8 ===============================================================
    9 
   10 
   11 A generic digital 24-port PCI GPIO card can be built out of an ordinary
   12 Brooktree bt848, bt849, bt878 or bt879 based analog TV tuner card. The
   13 Brooktree chip is used in old analog Hauppauge WinTV PCI cards. You can easily
   14 find them used for low prices on the net.
   15 
   16 The bt8xx chip does have 24 digital GPIO ports.
   17 These ports are accessible via 24 pins on the SMD chip package.
   18 
   19 
   20 ==============================================
   21 ==  How to physically access the GPIO pins  ==
   22 ==============================================
   23 
   24 The are several ways to access these pins. One might unsolder the whole chip
   25 and put it on a custom PCI board, or one might only unsolder each individual
   26 GPIO pin and solder that to some tiny wire. As the chip package really is tiny
   27 there are some advanced soldering skills needed in any case.
   28 
   29 The physical pinouts are drawn in the following ASCII art.
   30 The GPIO pins are marked with G00-G23
   31 
   32                                            G G G G G G G G G G G G     G G G G G G
   33                                            0 0 0 0 0 0 0 0 0 0 1 1     1 1 1 1 1 1
   34                                            0 1 2 3 4 5 6 7 8 9 0 1     2 3 4 5 6 7
   35            | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
   36            ---------------------------------------------------------------------------
   37          --|                               ^                                     ^   |--
   38          --|                               pin 86                           pin 67   |--
   39          --|                                                                         |--
   40          --|                                                               pin 61 >  |-- G18
   41          --|                                                                         |-- G19
   42          --|                                                                         |-- G20
   43          --|                                                                         |-- G21
   44          --|                                                                         |-- G22
   45          --|                                                               pin 56 >  |-- G23
   46          --|                                                                         |--
   47          --|                           Brooktree 878/879                             |--
   48          --|                                                                         |--
   49          --|                                                                         |--
   50          --|                                                                         |--
   51          --|                                                                         |--
   52          --|                                                                         |--
   53          --|                                                                         |--
   54          --|                                                                         |--
   55          --|                                                                         |--
   56          --|                                                                         |--
   57          --|                                                                         |--
   58          --|                                                                         |--
   59          --|                                                                         |--
   60          --|                                                                         |--
   61          --|   O                                                                     |--
   62          --|                                                                         |--
   63            ---------------------------------------------------------------------------
   64            | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
   65            ^
   66            This is pin 1
   67 

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