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62 lines
4.0 KiB
62 lines
4.0 KiB
=================================================================== |
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A driver for a selfmade cheap BT8xx based PCI GPIO-card (bt8xxgpio) |
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=================================================================== |
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For advanced documentation, see https://bues.ch/cms/unmaintained/btgpio.html |
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A generic digital 24-port PCI GPIO card can be built out of an ordinary |
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Brooktree bt848, bt849, bt878 or bt879 based analog TV tuner card. The |
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Brooktree chip is used in old analog Hauppauge WinTV PCI cards. You can easily |
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find them used for low prices on the net. |
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The bt8xx chip does have 24 digital GPIO ports. |
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These ports are accessible via 24 pins on the SMD chip package. |
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How to physically access the GPIO pins |
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====================================== |
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The are several ways to access these pins. One might unsolder the whole chip |
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and put it on a custom PCI board, or one might only unsolder each individual |
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GPIO pin and solder that to some tiny wire. As the chip package really is tiny |
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there are some advanced soldering skills needed in any case. |
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The physical pinouts are drawn in the following ASCII art. |
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The GPIO pins are marked with G00-G23:: |
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G G G G G G G G G G G G G G G G G G |
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0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 |
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0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 |
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--------------------------------------------------------------------------- |
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--| ^ ^ |-- |
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--| pin 86 pin 67 |-- |
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--| |-- |
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--| pin 61 > |-- G18 |
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--| |-- G19 |
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--| |-- G20 |
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--| |-- G21 |
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--| |-- G22 |
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--| pin 56 > |-- G23 |
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--| |-- |
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--| Brooktree 878/879 |-- |
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--| |-- |
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--| |-- |
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--| |-- |
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--| |-- |
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--| |-- |
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--| |-- |
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--| |-- |
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--| |-- |
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--| |-- |
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--| |-- |
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--| |-- |
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--| |-- |
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--| |-- |
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--| O |-- |
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--| |-- |
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--------------------------------------------------------------------------- |
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^ |
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This is pin 1 |
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