AM335x audio with WM8960

lianrong li

Prodigy 250 points

I recently studied the McASP of AM335x and the codec of my board is WM8960.

But the MCLK of WM8960 is sourced by a externally crystal(24.576M) and no pin

is connected to AHCLKX/R. The output pin of externally crystal is connected to

MCLK pin of WM8960 and the GPIO0_19(XDMA_EVENT_INTR0) of the AM335x.

Questions:

1. Can the McASP work in slave mode without AHCLKX/R ?

2. Why the XDMA_EVENT_INTR0 is connected ?

over 10 years ago

0 Biser Gatchev-XID over 10 years ago

TI__Guru**** 393215 points

Hi,

lianrong li said:
1. Can the McASP work in slave mode without AHCLKX/R ?

Yes, it's possible to generate these clocks internally, but I don't think clocks that are exact divisions of 24.576MHz can be achieved. What is your data format and bit clock rate?

lianrong li said:
2. Why the XDMA_EVENT_INTR0 is connected ?

Is this a custom board?

0 lianrong li over 10 years ago in reply to Biser Gatchev-XID

Prodigy 250 points

Yes, this is a custom board.
The MCLK of codec is connected to the output pin of external crystal,
so I can not use the internal clock generator. If no AHCLKX/R supplied,
can the soc work in slave mode with ACLKX/R and AFSX/R only?

BR

0 Biser Gatchev-XID over 10 years ago in reply to lianrong li

TI__Guru**** 393215 points

Yes, it can. Bit clock should be enough for slave mode.

0 lianrong li over 10 years ago in reply to Biser Gatchev-XID

Prodigy 250 points

Thanks

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AM335x audio with WM8960