Umer-
> I couldn't get your second hint related to single circular ....I/O pointer shifted
> tio each others.So far as your point of not debugging my assignment is concerned,
> let me tell you that after this preliminay set up (just to verify the correct
> working of DSK's CODEC) I have to undergo a detailed course of DSP alongwith DSK
> training. So plz change your mind that i am getting my assignment done from you. If
> you dont help me I will do it after 6 months. I just want to show it to my advisor.
> Otherwise i will just show him the loopback working. I was trying to show him a
> good piece of work by looping it back after some seconds. Also I have the Java
> experiance not for C.So I would be happy if you help me getting it done. Otherwise
> no prob.,,,

Ok ok... something like the code example below.  For a sampling rate of 8 kHz, output
will be delayed from input by 4 sec.  I only stored left channel.  I didn't test the
code.

-Jeff
define #BUFLEN 16384  /* must be power of 2 */
short left, right, inptr, outptr;
short buf[BUFLEN];

  inptr = 0;
  outptr = BUFLEN-1;

  while (TRUE) {

    while (!DSK5510_AIC23_read16(hCodec, &left));
    while (!DSK5510_AIC23_read16(hCodec, &right));

    buf[inptr++] = left;
    inptr &= BUFLEN-1;

    left = buf[outptr++];
    outptr &= BUFLEN-1;

    while(!DSK5510_AIC23_write16(hCodec, left));
    while(!DSK5510_AIC23_write16(hCodec, right));
 }

> Jeff Brower <j...@signalogic.com> wrote:
>
>      Umer-
>
>      > Thanks for ur reply. The code snippet that u have mentioned (i.e.
>      > loopback) is already working and i hav already tried it out. But I just
>
>      > want to store the audio input in some buffer array or any thing else.
>      And
>      > then I want to loop it back after sometime (in seconds just like after
>      > introducing some delay). Please look in to my code to understand wht i
>      > am trying to do. This is my first assignment to configure DSK and a
>      > preliminary demo (abt which my question is). After that i will start
>      > learning DSP concepts and tutorials and manuals of CCS. So kindly help
>      > me to get this first step.
>
>      I know what you're trying to do, and I know what's wrong with your code.
>      But I'm not
>      going to debug your assignment for you.
>
>      The point of my reply is to show that you are assuming too many steps
>      between the
>      initial working code, and your objective -- which is a typical student
>      error. If you
>      go carefully, step-by-step, then you can figure it out. I'll give you 2
>      hints: a)
>      don't make separate for-loops, and b) use a single, circular buffer with
>      input and
>      output pointers shifted from each other.
>
>      Good luck!
>
>      -Jeff
>
>      > Umer-
>      > >
>      > >> So did u find answer to your query? I am really a new comer in
>      > >> DSP domain and unknown to working C5510 in detail. I want to read
>      > >> audio input from mic and store it.Then i want to play it back to
>      > >> headphone.
>      > >>
>      > >> This is my main():
>      > >
>      > >First I would try something very simple to verify your DSK board, tool
>
>      > >set-up, build options, memory map, and other basic factors are Ok:
>      > >
>      > >void main() {
>      > >
>      > >DSK5510_AIC23_CodecHandle hCodec;
>      > >Int16 left,right;
>      > >
>      > > /* Initialize the board support library, must be called first */
>      > > DSK5510_init();
>      > >
>      > > /* Start the codec */
>      > > hCodec = DSK5510_AIC23_openCodec(0, &config);
>      > >
>      > > /* Audio loopback */
>      > > while (TRUE) {
>      > >
>      > > while (!DSK5510_AIC23_read16(hCodec, &left));
>      > > while (!DSK5510_AIC23_read16(hCodec, &right));
>      > >
>      > > while(!DSK5510_AIC23_write16(hCodec, left));
>      > > while(!DSK5510_AIC23_write16(hCodec, right));
>      > > }
>      > >
>      > > DSK5510_AIC23_closeCodec(hCodec);
>      > >}
>      > >
>      > >This should enable audio loopback -- you should hear whatever is on
>      the
>      > >inputs. Does that much work? If so, then you can go step-by-step to
>      add
>      > >the functionality you need, testing each step carefully.
>      > >
>      > >Also, here is a nice page for generating a sine wave with DSK 5510:
>      > >
>      > > http://www.tkt.cs.tut.fi/kurssit/3516/exercises/fall05/test_audioIO.c
>
>      > >
>      > >-Jeff
>      > >> void main()
>      > >> {
>      > >>
>      > >> DSK5510_AIC23_CodecHandle hCodec;
>      > >> Int16 i,j,k,left,right;
>      > >> Int16 input1[8000];
>      > >> Int16 input2[8000];
>      > >> /* Initialize the board support library, must be called first */
>      > >> DSK5510_init();
>      > >>
>      > >> /* Start the codec */
>      > >> hCodec = DSK5510_AIC23_openCodec(0, &config);
>      > >>
>      > >> /* Generate a 1KHz sine wave for 5 seconds */
>      > >> for (i = 0; i < 10; i++)
>      > >> {
>      > >> for (j = 0; j < 8000; j++)
>      > >> {
>      > >> /* Read a sample from left channel */
>      > >> while (!DSK5510_AIC23_read16(hCodec, &left));
>      > >> input1[j]=left;
>      > >>
>      > >> /* Read a sample from right channel */
>      > >> while (!DSK5510_AIC23_read16(hCodec, &right));
>      > >> input2[j]= right;
>      > >> }
>      > >>
>      > >> }
>      > >> for (i = 0; i < 10; i++)
>      > >> {
>      > >> for(k=0; k {
>      > >> while(!DSK5510_AIC23_write16(hCodec, input1[k]));
>      > >> /* Send a sample to the right channel */
>      > >> while(!DSK5510_AIC23_write16(hCodec, input2[k]));
>      > >> }
>      > >> }
>      > >> /* Close the codec */
>      > >> DSK5510_AIC23_closeCodec(hCodec);
>      > >> }
>      > >>
>      > >> But it is not giving any output. What to do?
>      > >> kindly help me where i am going wrong. I will be waiting for ur
>      reply
>      > >>
>      > >> regards,
>      > >> Umer
>      > >> >
>      > >> > hello everybody
>      > >> > i m an student doing project "Real time
>      > >> > implementation of G.723.1 on TMS320VC5510"
>      > >> > right now i am ready with optimised code which is
>      > >> > running in CCS simulator by taking i/p from file and
>      > >> > putting o/p in2 file
>      > >> > but now my next step is to run it in to DSK board for
>      > >> > that i have to take i/p from mike and taken o/p from
>      > >> > headphone
>      > >> > and for that i have to interface adc/dac of that
>      > >> > particular board which uses AIC23 as a codec.
>      > >> > i tried 2 get some idea from audio project available
>      > >> > in TI but not getting the flow as i don't aquant with
>      > >> > DSP-BIOS also
>      > >> > please any1 sugest me how to proceed or else can
>      > >> > anybody send me programme to interface codec withought
>      > >> > using DSP-BIOS
>      > >> >
>      > >> > sorry for long mail
>      > >> > waiting for early reply as i have to submit my project
>      > >> > bbye
>      > >> > Alpana
>      > >> > M.E.(GCOEP)
>      > >> > Pune
>