SAMG55 Xplained Pro I2S Clocking for 48Khz

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jonavarque
Posts: 29
Joined: Fri Jul 10, 2015 6:35 pm

SAMG55 Xplained Pro I2S Clocking for 48Khz

Fri Aug 28, 2015 6:30 pm

Using the G55 Xplained Pro, I have an audio player working quite well. Now, I would like to get actual 48Khz/12,288 Mhz clocking for the I2S. Without changing the system clock I am not seeing a way to accomplish this, beyond extra hardware outside of the G55 and running the I2S as a slave. Because of the codec I am using, I don't think that is possible.

I have been wondering if the G55 would still run if I used a 12.288 Mhz XTAL OSC instead of the 12Mhz. ? Otherwise, I am not seeing another method I can use to cleanly do this.

Any options?

[update] On the G55 Xplained Pro the XIN pin can accept a crystal oscillator. The MAIN_CLOCK in the G55 isn't being used to the 12.288 can be used by the MAIN_CLOCK. Then, set the PCKx (PCK4 for I2SC0) to use MAIN_CLOCK

God I wish the documentation was up to 2015 standards for Atmel parts. It really is a complete mess.

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