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Linux/Documentation/bt8xxgpio.txt

  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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