when i use TMDSSKAM3358 play music,i found that some ka ka soud With the music。
Hardware Platform: TMDSSKAM3358
Software Platform :AM335x StarterKit WEC7 Binary Image
http://www.adeneo-embedded.com/Products/Board-Support-Packages/Texas-Instruments-Sitara
Audio codec ic :TLV320AIC3106
The following is a method of reproducing:
1,boot the TMDSSKAM3358
2.use a media player play a music, i use a mfcplayer
3.ensure the control panel's Volume is max
4.back to desktop,right click on the desktop
5. click the 'Properties',
6. click the 'Appearance' Tab
7. click the ’Item‘ Drop-down box
8.Now the vertical scroll bar is Appear
9.Slide up and down the scroll bar with the mouse quickly
10. ka ka sound is appear。
I have measure the mcasp(digital) signals between AM335x and AIC3106, the HPOUT(analog) signal from AIC3106.
when the ka ka sound apear ,the DIN (digital) signal of aic3106 Suddenly thinning and a pluse appear on the HPOUT(analog) signal ,the BCLK(digital) frequency is 1.536 MHz,the WCLK(digital) frequency is 48 KHz.
when i disconnect the DIN pin of aic3106 from AM335x , there is no sound on HPOUT.
I am very sure that something must be happen when i Slide up and down the scroll bar.
May be the display driver, audio driver have a bug,but i don't know how to solve it.
Do somebody meet the same thing like me?
Can you give me some suggestion to find bug in display driver or audio driver ?