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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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