[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