Analog write primitive

[tolauwae]

Add the analog_write primitive.

[carllocos]

Out of curiosity is the analogWrite a newly supported function for the ESP32?

The reason why I ask is because I recall that such a function was not supported for the ESP32 which is also the reason why I wrote the previous primitive chip_analog_write (now renamed to chip_ledc_set_duty). Now seeing you use the Arduino analogWrite makes me doubt whether I overlooked its existence.

[tolauwae]

Out of curiosity is the analogWrite a newly supported function for the ESP32?

I thought so. I'll double check.

If not, that does pose a conundrum. Do all the Arduino primitives need to be supported for the ESP? Ideally, I'd say yes, but the counter argument is that real Arduino devices may want to use this primitives.

That is an annoying decision we will continue to encounter as long as we haven't added a modular system.
Don't know on what criteria to decided in those cases.

[carllocos]

@tolauwae I think the analogWrite is indeed new because the reason why I wrote the now-called chip_ledc_set_duty is also because back in the time I could not compile the VM when using analogWrite on the ESP32.

That is an annoying decision we will continue to encounter as long as we haven't added a modular system.
Don't know on what criteria to decided in those cases.

Agree so maybe for the time being we should ignore this issue since this will naturally resolve when switching to a modular system.

[tolauwae]

But compilation works this time around. All CI checks are green.

I'll double check if it works for the fade example tomorrow.

[tolauwae]

@carllocos the primitive works fine on ESP32. I actually used it in code for the MobiSys demo.