hello,
Im using the arduino IDE to program the pico and would like to know if the analogwrite is done via hardware or is being done ISR way,
I would also like to change the PWM frequency but i dont think arduino core has that function?
am i just stuck, have to use 3rd party libraries?
Yes it is.
The PWM is also capable of being produced by the PIO pins as a state machine.
Changing the PWM frequency is possible.
See
https://www.codrey.com/raspberry-pi/raspberry-pi-pico-pwm-primer/
The guide is in python though, i need to do it in the arduino IDE. kinda stuck with arduino IDE as the libraries on some portion of my setup is only arduino compatible 
If you'd just like to use PWM for RP2040, try these libraries of mine
It seems that you're start moving into RP2040, it's better to have a look at and see that there are already many libraries to support RP2040
Your library examples are in category of UNSUPPORTED in the arduino examples tab.
I am also having a hard time , so the duty cycle parameter what is the value range? 0- 100 because it seem to have a double data type
Your library examples are in category of
UNSUPPORTEDin the arduino examples tab.
Will fix in next release of some libraries. As you use mbed_rp2040 core, the slow PWM library to use is MBED_RP2040_Slow_PWM
If the library's examples are not shown or shown as UNSUPPORTED , move down to the INCOMPATIBLE list of examples or open directly from the libraries folder
I am also having a hard time , so the duty cycle parameter what is the value range? 0- 100 because it seem to have a double data type
It's double, so you can use from 0.000-100.000 to have better precision.
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