Hi there,
Figure 1 shows the WCLK clock. It seems to be good.
(Figure 1)
I saw a strange thing happened on MCLK. Figure 2 and Figure 3 shows the MCLK when I start the board for first time.The Linux kernel is loaded. All things seem to be good. HOWEVER, when I start recording and playing with the audio codec, the MCLK changes. Figure 4, Figure 5, and Figure 6 show the MCLK after using Audio Codec. Wowwww! It does not seem to be NORMAL. We have three OMAP-L137 boards and all have the same problem. The version of our boards is " I ". you can check this Problem easily.
I use the following instruction on ARM to record and play a sinusoid wave. The sinusoid wave is generated by a signal generator.
arecord -d 20 -D 'hw:0,0' -r 96000 -f S32_LE -c 2 | aplay -D 'hw:0,0' -c 2
(Figure 2)
(Figure 3)
(Figure 4)
(Figure 5)
(Figure 6)
Jack,