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Discussion Groups | TMS320C54x | Re: input and output to the 5402 DSK

Technical discussions about the TI C54x DSPs (including the c5401, c5402, c5402a, c5404, c5407, c5409, c5409a, c5410, c5410a, c5416, c5420, c5421, c5441, c549, c5470 and c5471).

  

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input and output to the 5402 DSK - Ping Li - Jun 19 21:44:00 2002



Hello,

I met with difficulty when I tried to write the
program for the input and output to the 5402 DSK. Does
anyone can help me to write a single program which
only receives a sine wave with f=200Hz and output it
without doing any process?

Thanks a lot!

Lily




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Re: input and output to the 5402 DSK - Les Newell - Jun 20 12:54:00 2002

If you are working in C then there is an example that does this. Look in
C:\ti\examples\dsk5402\dsp\codec or C:\ti\examples\dsk5402\dsp\codec_bios

If you want to use assembly language then the sinewave generator demo in
C:\ti\examples\dsk5402\host\dsp is very easy to modify.

HTH,

Les > Hello,
>
> I met with difficulty when I tried to write the
> program for the input and output to the 5402 DSK. Does
> anyone can help me to write a single program which
> only receives a sine wave with f=200Hz and output it
> without doing any process?
>
> Thanks a lot!
>
> Lily > _____________________________________





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Re: input and output to the 5402 DSK - Vasanth Machado - Jun 20 15:03:00 2002

Hi Lily

I think this may help you to input and output a sinewave through a codec
using MCBSP.

1. Initialize codec. If you are using AD50 initialize the following
codec_dac_mode
codec_adc_mode
codec_ain_gain
codec_aout_gain
codec_sample_rate

2. Initialize the interrupts

INTR_GLOBAL_DISABLE;
INTR_HOOK
INTR_ENABLE
INTR_GLOBAL_ENABLE 3. use the follwing lines for input-output
Reading input
int input_sample()
{
return(*(volatile u16*)DRR1_ADDR(HANDSET_CODEC));
}

displaying Output
void output_sample(int data)
{
*(volatile u16*)DXR1_ADDR(HANDSET_CODEC)=data;
} I think this should work fine. For reading the signal of appropriate
frequency you ave to give the Nyquest Frequency value in
"Codec_sample_rate" function.

Vino
>From: Ping Li <>
>To:
>Subject: [c54x] input and output to the 5402 DSK
>Date: Wed, 19 Jun 2002 14:44:21 -0700 (PDT)
>
>Hello,
>
>I met with difficulty when I tried to write the
>program for the input and output to the 5402 DSK. Does
>anyone can help me to write a single program which
>only receives a sine wave with f=200Hz and output it
>without doing any process?
>
>Thanks a lot!
>
>Lily >_____________________________________ _________________________________________________________________
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passive filtering in codec - Maria Leonor Rosales - Jun 22 3:41:00 2002

I was reading a CCS help file. It said there that there is passive filtering
between the input audio jack and the codec for increased performance (of codec).
Is this passive filter an anti-alias filter? What does it exactly do?
thanks
leonor





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Re: input and output to the 5402 DSK - steven.shiou - Jun 25 7:52:00 2002

You may try to read the spru302 page4-30~36. Use that
setting to match your i/o . Then polling the input
then output to the output pin . Because I can't think
that H/W can support this . --- Ping Li <> 的訊息：> Hello,
>
> I met with difficulty when I tried to write the
> program for the input and output to the 5402 DSK.
> Does
> anyone can help me to write a single program which
> only receives a sine wave with f=200Hz and output it
> without doing any process?
>
> Thanks a lot!
>
> Lily > _____________________________________ >

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