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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 dayTranslated with www.DeepL.com/Translator (free version)
The link provided by rkopsch in your other question explains how to set the CPU clock speed for the SAMD21.
The SAMD21 pack for the Keil MDK only includes headers for CMSIS drivers for SPI, UART, etc. It does not include implementations of those drivers. You have to make the implementations yourself, using the headers as a starting point.
Thank you! you are so right is what I am seeing and now I got into designing those features thank you for any question I ask you thank you.