Jeff-
Actually when i run this code a shrill sound is heard from headphones and then every thing
stops. And then sometimes nothing comes out (nothing happens). When i use software delay loop
like:

Uint32 delay;
DSK5510_AIC23_CodecHandle hCodec;
Int16 i,sample,left,right; 
DSK5510_init();
hCodec = DSK5510_AIC23_openCodec(0, &config);
 while(true)
       {
           /*Read a sample from the left input channel */ 
           
            while(!DSK5510_AIC23_read16(hCodec, &left));
            
            for(delay=0; delay=3000000;delay++
             {
             }
           
              /* Send a sample to the left channel */
		
	    while(!DSK5510_AIC23_write16(hCodec, left));

        } 
In this way it doesn't work and simply nothing happens or no sound. Actually I used that loop
from another example of CCS (LED example).In that example it was used to introduce a delay in
blinking of LEDs. Is this approach valid? Or I have to go through shifting in arrays only.No
other way.

Umer-
>
>>  Sorry I was out of town so didn't respond you timely
>>  No it is not working....even after outptr=1.....now what to do. Ok just
>>  ell me is there any other way..or how can we improve it..
>
>Please explain "not working".  What happens?
>
>>  .what is the purpose of software delay loop...can't we use it?
>
>I thought that's what you wanted, a long delay between output and input.
>
>-Jeff
>
>>  > It was pointed out to me that outptr should be initialized to 1 to get the
>>  > full 4 sec delay:
>>  > 
>>  >   inptr = 0;
>>  >   outptr = 1;
>>  > 
>>  > Let me know if it works, or at least gets you closer.
>>  > 
>>  > -Jeff
>>  > 
>>  > ---------------------------- Original Message ----------------------------
>>  > Subject: Re: [c55x] Re:  Re: query regarding interfacing of ADC/DAC for
>>  > speech      i/p and o/p From:    "Jeff Brower"
>>  > Date:    Thu, October 12, 2006 7:18 pm
>>  > To:      "Umer Khan"
>>  > Cc:      c...@yahoogroups.com
>>  > --------------------------------------------------------------------------
>>  > 
>>  > 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    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
>>  > > 
>>  > 
>>