Generate 32768 hz signal on a GPIO

[Florin]

Hi,

Sorry for the noob question: I would like to generate a signal on a GPIO pin that beats at exactly at 32768 Hz. Is it possible to use the RTC having prescaler set to 0 and CC set to 1?

Thank you! florin

[Yashur]

Hey florin! May i know how did you manage to do it? Can you provide me with the basic code for LFCLK! Thank you!

[Florin]

Hi Yashur, I used initially the code in the link above. I actually needed the signal for the Si4703 FM receiver and the signal provided via the GPIO although was oscillating correctly I suppose, introduced so much noise that it made tuning impossible. In the end I shared the 32k signal from the crystal and it worked perfectly.

[Yashur]

Hi florin! I need a 32k clock for MAX30003 bio medical sensor too! But i'm measuring only 16.38Khz with the above code.Did you get a 32K signal from the above code? and how did you share the 32k signal from the crystal? It was a hardware sharing or a software sharing? Thank You!

[Florin]

Hardware. I patched a wire from the crystal to the other chip.

[Yashur]

The RTC clock gives only half of it as the frequency as the frequency,that is 16.37KHz