Consulta de los CMSIS Drivers

I asked in the previous question, but they didn't answer me anymore, but I come back to the question without problems.

I asked if in this file I found system_samd21.h I can add code to modify the GCLK_MAIN

This is where I can add code to manipulate the frequency of GCLK_MAIN,  I tried to modify the frequency and I can't, on the contrary as the microphone got blocked I had to reset the microphone, that's my doubt.

And the other question is if the CMSIS DRIVER are compatible with the SAMD21 microchip(ATMEL) or where in this link: www.keil.com/.../index.html, or where I can consult the compatibility of the CMSIS DRIVER with the microchip that is my other doubt.

Thanks! and have a nice day

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