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Documentation / bt8xxgpio.txt




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Based on kernel version 3.13. Page generated on 2014-01-20 22:00 EST.

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
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