ADAU1451 RMS Таблица INDEX_1 вопрос

ADAU1451 RMS Table Index_1 issue

Активно 3 Ответы 127 Просмотры 2016-02-04 Работа с SigmaDSP

Dear Sir,

 

Our customer found an issue on ADAU1451 SigmaDSP, the RMS table seem have problem.

 

When RMS Table choose index 1 (means -90dB), the output of RMS table is wrong and change repeated.


For example, please see attached .dspproj file, RMS table should output 5.96E-08 on format 8.24 (i.e. 0x00000001 on binary) when input = -90dB.

But as attached video show, it output wrong value (ex. 0xE4F4A25A on binary).

 

 

Note every other index (2~33) are all correct.

Sometimes after boot up , index 1 is correct. But wait a while, index 1 have problem again.

 

 

Could you confirm if it is a bug. If yes, how could our customer workaround it?


Thanks

attachments.zip
guest replied
1 Year
This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum.

Thank you,
EZ Admin
guest replied
4 Years

Dear Bob,

Thank you for your response and your attached re-worked project.

Best regards,

Sam
guest replied
4 Years

    Hello,

    At first I could not get your project to load onto my ADAU1452 eval board (it gave Comm Failure errors, as if the USBi wasn't working),  The project loaded fine after re-drawing it from scratch.  In my case the RMS table works properly at any index, without the random numbers you were experiencing:

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