CCS/TLV320AIC3256: TLV320AIC3256

Hi Diego

Do you speak Spanish? As per your name and surname it's very posible. Thank you for your quick reply to my problem I think it would be solved in a minute when we change the script for the inputs. The big problem I have now is I tested some projects designed for the AIC3254. Those projects changed the sample frequency of my EVM to 16,000 instead 44Khz. When I get back to the projects for the AIC3256 several errors were issue by the PPS. I try to install the .bin for 44Khz and now the EVM do not connect with the PC. Do you know the procedure to get back to the initial configuration in the EEPROM to have the EVM working again?
Best regards
Daniel Alayon

Hi, Daniel,

Thanks for the feedback!, I do speak Spanish (is my mother tongue actually), but in E2E we need to keep the conversation in English :).

It seems that PPS re-programmed the EEPROM of your EVM, I think this is a problem with the way the software makes this process. Please try the steps mentioned in this wiki article to re-program the EEPROM of your EVM.

Whenever PurePath Studio request to change the sampling rate by reprogramming the EEPROM, please ignore the request and change the firmware manually.

Best Regards,

  -Diego Meléndez López
   Audio Applications Engineer

Thank you Diego; have a nice weekend

Regards

Daniel Alayon

Hola Diego

When I have done the steps in the wiki to reprogram the EEPROM the system (OS Windows 10) do not wait for the installation of the driver.
The system says is configuring the device and put a new device as UNKNOWN with no controller.
I made several (ten or more) times the procedure in the wiki but the messages from the BFUTEST are always the same telling there is no EEPROM at the desired address. We short the P1 and P2 pines as there are no other chance to short the SDA and SCL pins of the EEPROM.

Do you have some other tip to us to reconfigure the EVM board?

Best regards

Daniel Alayon

Hola Daniel,

This might be a problem caused by Windows forcing the automatic driver install. I haven't experienced a similar issue before. One thing you might try would be to manually force the correct driver to the EVM, then it should be recognized as DFUUSB device so you can use the tool to program the EEPROM.

Best Regards,

  -Diego Meléndez López
   Audio Applications Engineer

Hi Diego

I use a old PC with XP and now all it's working fine.

Only one exception; the microphone of the headset Works well (I think it's one electrect type) but the semi-proffesional ones not. 

The sound it's very very low; do you think it would be the DC bias or other kind of configuration should be done for this device?

Best regards

Daniel Alayon

Hola Daniel,

Thanks for the feedback, I'm glad to hear the main issue was solved. 

Regarding the mic problems, it is possible that ass you mention the semi-professional mic requires a higher biasing voltage to operate properly. This coded is set to be used in portable applications where the general  used mics are electret type ones. You might try increasing the PGA gain and see if you can increase the input signal. 

Best Regards,

  -Diego Meléndez López
   Audio Applications Engineer

Hi Diego

Thanks a lot for your assistance and Support, it was very useful to solve the problems we have had.

Is it enough the "TLV320AIC3256 Application Reference Guide" to manage the registers and functions availables through the "AIC3256-U Control Software";

or there are other resources to increase the knowledge in the AIC3256 miniDSP?

Best regards

Daniel Alayon

Hi, Daniel,

I'm glad to hear your issue was solved. Regarding your question, the application reference guide should be enough to configure and control the device with the register settings, just as the Control Software. For miniDSP development, you can take a look to this wiki entry to find more information,

Best Regards,

  -Diego Meléndez López
   Audio Applications Engineer

Hi Diego

I had installed the different softwares for the AIC3254  in my lab with in a computer with Windows 7 (32bits) Proffesional but the interfase for the app AIC3256EVM-U CS when it's opened it do not shows the functions in the White window. Attached is an image.

Could you give us a clue about what is happing?

Regards

Daniel Alayon

Hola Diego

There are some reports saying the AIC3254/56 do not fulfill the functionality for ANC by cause the clock velocity.

Do you recommend other miniDSP and its board evaluation for Active Noise Cancellation?

Best regards

Daniel Alayon

Hola, Daniel.

As you mention, the miniDSP on the TLV320AIC3256/54 doesn't support ANC. Unfortunately, the miniDSP of our devices doesn't have enough capabilities to make an effective algorithm for noise cancellation. For a ANC implementation, we recommend to use external DSP.

Best Regards,

  -Diego Meléndez López
   Audio Applications Engineer

Hola Diego

Do you suggest or indicate which one external DSP, model, serial number?

Regards

Daniel Alayon

Hi, Daniel,

Unfortunately I don't have the full context to suggest a preferred DSP for this type of applications, I would recommend you to check with my colleagues of the C55x DSP forum for the best device recommendation for your application.

Saludos!

  -Diego Meléndez López
   Audio Applications Engineer

Hola Diego

Thanks for your suggest. I will continue for the moment doing tests with the 3256 as we are looking to reduct the noise in the band that is going from the 20 to 200 Hz. As they are low I have hope the 3256 has enough power to manage the active filters and the AD - DA converters into that range with property.

Regards

Daniel Alayon

Hi Diego

Which would be the function (parameter) in the PurePath Studio to invert one of the channels?

Best regards

Daniel Alayon

Hola Diego

It sounds good and with sense

Muchas gracias

Daniel Alayon

Hola Diego

"Negate" function Works very well to invert the signal from one chanel. Düring the compilation of the code the PPS says the board is at 8KHz of sampling instead 44KHz. 

1) How may I change the sample rate of the board?

2) The information of the board says there is necessary an external audio input for 86KHz and 192KHz; what it's means?

Regards 

Daniel Alayón 

Hola Diego

Thanks for your reply.

About answer 2.-; is there some examples to see in the wikies the implementation with an external interface to reach those sample frequencies?

Saludos

Daniel Alayon

Hola Diego

This is not the board we have, the one we have is the AIC3256 EVM :

Regards

Daniel Alayon

Hola Daniel,

Thanks for the clarification and sorry for the confusion, I thought you were using an 'AIC3254 EVM. For the 'AIC3256EVM, unfortunately there is no a direct way to input an external I²S interface without reworking the board [remove the TAS120B USB interface].

Best Regards,

  -Diego Meléndez López
   Audio Applications Engineer

Thank you Diego

Best regards

Daniel Alayon

Hola Diego; Feliz Año Nuevo!!!

Regarding about the mic problems, it's sure it would be produced by the low biasing in the AIC3256; could you Please give us directions how to change the register R51 to deliver 2.5 volts as bias?

Best regards

Daniel Alayon

Hola Daniel,

In order to configure the micbias of the 'AIC3256 as 2.5V, Page 1: Register 51 bits D5 and D4 should be set to "11".

2.5V will be the micbias voltage with this configuration as long as the full Chip Common mode is set as 0.9V (Page 1: Register 10, Bit D6).

Feliz año!

Best Regards

  -Diego Meléndez López
   Audio Applications Engineer

Hi Diego, same for you!!!

Then in Register 51, Page 1 it would be filled with 0x30 and for Register 10 at Page 1 it would be 0x40, that's right?

Regards

Daniel Alayon