Please, report us how good it worked. I am looking for a solution for a case like this, but didn't know how would be the correct approach. Could you post the mods, and the code you used to change the channels ? Best regards ! Gleicon S. Moraes | gleicon@xxxxxxxxxxxx - gleicon@xxxxxxxxxx http://videodog.cjb.net http://planeta.terra.com.br/informatica/gleicon/ ----- Original Message ----- From: "Robert D." <xkill@xxxxxxxxxxxxxxxx> To: <video4linux-list@xxxxxxxxxx> Sent: Monday, September 17, 2001 6:11 PM Subject: BT878 + 16 Channel multiplexer > > I've mananged to borrow a bt878 card with an external 4067 multiplexer ( > 16input-1output, 4bit channel selection). > The 4 address lines from the 4067 are connected to the GPIO[0:3] (pins > 86-83). How can I control this thru the bttv driver (0.7.x)? > > By looking at the bttv-card.c code it looks like I need something like the > following: > > > // I'm ignoring the fact this runs on top AUDIO stuff, > // VIDIOCSAUDIO is used to set the current channel > // VIDIOCGAUDIO is used to read the current channel > // flags (stuct video_audio) constains the channel > { > name: "bt878 + 16channel mux (4067)" > video_inputs: 4, > pll: PLL_28, > audio_hook: external4067_muxsel > } > > void external4067_muxsel(struct bttv *btv, struct video_audio *v, int set){ > int data; > int input > > data=btread(BT848_GPIO_DATA); > > if(set){ // set mode, caused by VIDIOCSAUDIO > file://v->flags contaings the channel (4bit) from the user > if((v->flags<16)&&(v->flags>=0)) > data&=v->flags; > }else{ file://read mode, caused by VIDIOCGAUDIO > v->flags=data&0x000F; file://only return the [3:0] bits > } > > btwrite(data,BT848_GPIO_DATA); > } > > What does btread(BT848_GPIO_DATA) give me? Do I just set bit 0 to TRUE to > set the GPIO pin to TRUE? I'll try the code after I get some sleep. > > > > > _______________________________________________ > Video4linux-list mailing list > Video4linux-list@xxxxxxxxxx > https://listman.redhat.com/mailman/listinfo/video4linux-list >
