DM365 McBSP as Master

Appalayagari Sreedhar

Hi,

Q1.

How to configure DM365 McBSP as master?

If any reference code available on the web please point me to the link.

Q2.

is davinci-i2s.c supports DM365 McBSP as master?

Thank you, Sreedhar.

0 Sudhakar Rajashekhara over 13 years ago

Hi,

Looking at the code, I feel that support for Master mode is already present, but we have never tested it.

Regards, Sudhakar

0 Appalayagari Sreedhar over 13 years ago in reply to Sudhakar Rajashekhara

Dear Sudhakar,

Yes i verified that McBSP Master mode.

I am able to generate the clocks.

I have few clarifications regarding the input clock to the McBSP.

Suppose if we choose the Sysclk4 to be the input to the McBSP.

Sysclk4 = CPU/4 ( because PLL_DIV value is 0x8003)

Is it possible to generate the exact WS and Bit Clocks with DM365 as Master ranging from 8 - 48 kHz.

Thank you, Sreedhar.

0 Sudhakar Rajashekhara over 13 years ago in reply to Appalayagari Sreedhar

Hi Sreedhar,

You can use the below formula to calculate the sample rate:

sample_rate = clkrate / (CLKGDV + 1) * (Bits_Per_Frame)

Clkrate is the input clock to McBSP, CLKGDV is the 8 bit field in SRGR register and Bits_Per_Frame will be normally 32.

Regards, Sudhakar

0 Appalayagari Sreedhar over 13 years ago in reply to Sudhakar Rajashekhara

Hi Sudhakar,

Thank you.

-Sreedhar

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