Can Kinetis I2S do "DSP Mode"

[CiaranMacA_hkc]

Hi All,

I need to interface to a GSM modem which has an I2S audio interface - but the device implements "DSP Mode" only. That is to say, it uses an additional clock cycle to pulse the frame sync, then the following 16 cycles are used to clock the data. The interface does not toggle the Left / Right bit like standard I2S.

Thanks,

All the best,

Ciarán

[CiaranMacA_hkc · Accepted solution]

In fact the answer is "Yes it can". I needed to configure my modem in Master mode and my I2S in "normal mode" with the tx and rx clocks (bit clk and frame sync) set to "external". Also needed to set the frame sync to 1 bit. A bit of trial and error on word format, alignment and so on and now it works superbly.