I am using a SAMG55 Xplained Pro board to develop an audio player of sorts. It is all working fine with the 120Mhz system clock. At 46.875 Khz.
Now I would like to run the I2S at a real 48Khz/12.288Mhz.
I am not clear about the options I have. I2S only runs form either the MCK or the PCK4 clock. I can't see how to use an external crystal to get the rates I need.
I thought about overclocking the entire board, but I think I might lose the USB 48Mhz clock that way?
Otherwise, any hints would be helpful. I have only been working with the G55 for a month or so. I am probably missing something.