Two inputs to TMS320C6713 DSK

It should be possible.

Please check at the beginning your ground connection.

Did you try to connect this same signal to both inputs?
This can check how both channels are working

Thanks for replying

Ground should not be an issue. I am genrating signals from quad channel signal generator. It has common ground.

Have you tried to input two signals via left and right channel ?

Theoratically it should not be an issue.

I can see both signals on oscilloscope.

but when i pass those signal through kit i cant get output. 

I have also double verified my programs. They are correct and working perfectly for single input

Amir,

Leaving aside any processing of the signals involved, you're saying that you want a stereo talkthru program. That is indeed possible. If I understand your last two sentences correctly, you say that when you input a stereo signal you get no output but that when you apply an input to one channel only you get the output expected. Sorry to give just a list of questions rather than a definitive answer but I would test

When you say one channel input works, does this apply to both channels, i.e. do left and right channels work for single inputs?

When you apply a single input and get a correct output, is there any output on the other channel?

When you apply a stereo input, inside your program do you see the two signals, i.e. are they getting in okay but then not output correctly?

My suspicion is that you are not reading/unpacking the two 16-bit signal samples received from the codec ADC/MCBSP correctly and/or not packing the two 16-bit signal samples written to the MCBSP/codec DAC correctly, e.g. you're reading just 16 bits from the 32-bit data received and or you're not concatenating two 16-bit output samples correctly before sending a 32-bit word to the DAC. There are a number of things that must be set up/programmed right for stereo talkthru - codec, MCBSP and if you're using it, EDMA. The key thing I would look out for in each case is that you're transferring 32-bit data.

Donald

@ Donald

Thanks for reply

sorry for not clearing out on my statement. my bad. by single input i meant mono signal. i get no output for stereo signal. its noise. eg if i sampled at 96khz. i get output of 48khz.and output is varying in magnitude continuously. it goes high and then becomes low. if i sampled at 44khz. i get output at 22khz. i am not using any program. i am just inputting data. demux it into left and right channels and output any one of the channel through dac.

Infact i am using simulink Real time workshop for this purpose. when i use mono signal i get correct output. but not for stereo.

Regards

Amir

Amir,

A mono signal is a stereo signal where on channel is silent. Can you get mono signals to pass correctly, at different times, on either channel?

How about passing a mono signal through (correctly) and then gradually introducing a signal to the other channel?

I'm not familiar with the simulink/DSK tools so may not be able to help any further.

Donald

Donald

yes mono signal pass correctly at different times correctly. but it distorts when i pass two channel simultaneously. 

Regards

Amir