linuxdc-dev

[linuxdc-dev]Testing my understanding of maple

[Adrian M. <ad...@mc...>]

I have got my microphone driver to 'record' data, but its all garbage and 
nothing I do with sox appears to turn it into anything even approximating 
real world sound.

So I am wondering if I have misunderstood the basic maple callback mechanism 
(probably, I am sure, is the answer).

This is my current callback:

struct dc_microphone
{
  struct input_dev dev;
  struct maple_driver_data *data;
  unsigned char snd[8094];
  int open;

};

static void dc_microphone_callback(struct maple_driver_data *data)
{

	struct mapleq *mq=& data->mq;
	struct dc_microphone *mic = data->private_data;
	unsigned char *buf = (unsigned char *)mq->recvbuf;

	memcpy(mic->snd, mq->buf, 1024);
     
}

An OSS read call then reports back the contents of mic->snd. I am not worried 
about the size of the buffers at present, just getting the basic mechanism 
right.

I am assuming that on each call to callback mq->recvbuf contains the buffered 
data loaded by a DMA transfer - but this seems a pretty wild assumption.

Anyone able to tell me where this data really is and how to get it?

Thanks

Adrian

Re: [linuxdc-dev]Testing my understanding of maple

[M. R. B. <mr...@0x...>]

* Adrian McMenamin <ad...@mc...> on Sun, Feb 03, 2002:

>=20
> Anyone able to tell me where this data really is and how to get it?
>=20

The microphone has to be controlled before read.  Unless you have another
source on how the microphone works, be prepared to "hack it yourself".

M. R.

Re: [linuxdc-dev]Testing my understanding of maple

[Adrian M. <ad...@mc...>]

On Monday 04 Feb 2002 12:59 am, M. R. Brown wrote:
> * Adrian McMenamin <ad...@mc...> on Sun, Feb 03, 2002:
> > Anyone able to tell me where this data really is and how to get it?
>
> The microphone has to be controlled before read.  Unless you have another
> source on how the microphone works, be prepared to "hack it yourself".
>
> M. R.

I'm making some progress, but its slow. Oh well.

Re: [linuxdc-dev]Testing my understanding of maple

[Adrian M. <ad...@mc...>]

On Monday 04 Feb 2002 12:59 am, M. R. Brown wrote:
> * Adrian McMenamin <ad...@mc...> on Sun, Feb 03, 2002:
> > Anyone able to tell me where this data really is and how to get it?
>
> The microphone has to be controlled before read.  Unless you have another
> source on how the microphone works, be prepared to "hack it yourself".
>
> M. R.

Having spent all day (sort of) looking at the maple sources, I think I have a 
better understanding of all this, but my questions were really about the 
basic maple mecahnism, not the specifics of the SIP (which I am happy to hack 
away at).

Here are some of them:

mapleq.done - how is this set to non-zero?

maple_driver_cmd_callback - this is called via maple_dma_irq - does this mean 
there is data to be read when the callback is called (this is a slightly more 
sophisticated version of yesterday's question) - anyone able to tell me?

Adrian