1*4882a593Smuzhiyun=================================================================== 2*4882a593SmuzhiyunA driver for a selfmade cheap BT8xx based PCI GPIO-card (bt8xxgpio) 3*4882a593Smuzhiyun=================================================================== 4*4882a593Smuzhiyun 5*4882a593SmuzhiyunFor advanced documentation, see https://bues.ch/cms/unmaintained/btgpio.html 6*4882a593Smuzhiyun 7*4882a593SmuzhiyunA generic digital 24-port PCI GPIO card can be built out of an ordinary 8*4882a593SmuzhiyunBrooktree bt848, bt849, bt878 or bt879 based analog TV tuner card. The 9*4882a593SmuzhiyunBrooktree chip is used in old analog Hauppauge WinTV PCI cards. You can easily 10*4882a593Smuzhiyunfind them used for low prices on the net. 11*4882a593Smuzhiyun 12*4882a593SmuzhiyunThe bt8xx chip does have 24 digital GPIO ports. 13*4882a593SmuzhiyunThese ports are accessible via 24 pins on the SMD chip package. 14*4882a593Smuzhiyun 15*4882a593Smuzhiyun 16*4882a593SmuzhiyunHow to physically access the GPIO pins 17*4882a593Smuzhiyun====================================== 18*4882a593Smuzhiyun 19*4882a593SmuzhiyunThe are several ways to access these pins. One might unsolder the whole chip 20*4882a593Smuzhiyunand put it on a custom PCI board, or one might only unsolder each individual 21*4882a593SmuzhiyunGPIO pin and solder that to some tiny wire. As the chip package really is tiny 22*4882a593Smuzhiyunthere are some advanced soldering skills needed in any case. 23*4882a593Smuzhiyun 24*4882a593SmuzhiyunThe physical pinouts are drawn in the following ASCII art. 25*4882a593SmuzhiyunThe GPIO pins are marked with G00-G23:: 26*4882a593Smuzhiyun 27*4882a593Smuzhiyun G G G G G G G G G G G G G G G G G G 28*4882a593Smuzhiyun 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 29*4882a593Smuzhiyun 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 30*4882a593Smuzhiyun | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 31*4882a593Smuzhiyun --------------------------------------------------------------------------- 32*4882a593Smuzhiyun --| ^ ^ |-- 33*4882a593Smuzhiyun --| pin 86 pin 67 |-- 34*4882a593Smuzhiyun --| |-- 35*4882a593Smuzhiyun --| pin 61 > |-- G18 36*4882a593Smuzhiyun --| |-- G19 37*4882a593Smuzhiyun --| |-- G20 38*4882a593Smuzhiyun --| |-- G21 39*4882a593Smuzhiyun --| |-- G22 40*4882a593Smuzhiyun --| pin 56 > |-- G23 41*4882a593Smuzhiyun --| |-- 42*4882a593Smuzhiyun --| Brooktree 878/879 |-- 43*4882a593Smuzhiyun --| |-- 44*4882a593Smuzhiyun --| |-- 45*4882a593Smuzhiyun --| |-- 46*4882a593Smuzhiyun --| |-- 47*4882a593Smuzhiyun --| |-- 48*4882a593Smuzhiyun --| |-- 49*4882a593Smuzhiyun --| |-- 50*4882a593Smuzhiyun --| |-- 51*4882a593Smuzhiyun --| |-- 52*4882a593Smuzhiyun --| |-- 53*4882a593Smuzhiyun --| |-- 54*4882a593Smuzhiyun --| |-- 55*4882a593Smuzhiyun --| |-- 56*4882a593Smuzhiyun --| O |-- 57*4882a593Smuzhiyun --| |-- 58*4882a593Smuzhiyun --------------------------------------------------------------------------- 59*4882a593Smuzhiyun | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 60*4882a593Smuzhiyun ^ 61*4882a593Smuzhiyun This is pin 1 62*4882a593Smuzhiyun 63