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 | [EMAIL PROTECTED] - [EMAIL PROTECTED]
http://videodog.cjb.net
http://planeta.terra.com.br/informatica/gleicon/
----- Original Message -----
From: "Robert D." <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Monday, September 17, 2001 6:11 PM
Subject: [V4L] 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.
>
>
>
>
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>
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