Re: RP2350 and Pico 2 - things missing

James Harris <james.harris.1@gmail.com> wrote:

I have been looking forward to the Raspberry Pi Pico 2 for a while. The
increased speed will be welcome for one project I want to use it for.
 
However, according to what I've read there seem to be some missed
opportunities. Corrections would be welcome but AIUI:
 
* There are still no analogue /outputs/ - which I would have thought
would have been cheap and easy to provide.

I suspect the analogue drive circuit is not that simple - would take
area and may compromise power, especially idle power.

You can get some of the way by using PWM and an external R-C network to low
pass filter the PWM.  Depends what kind of frequency you need.  Or there are
I2C DACs if you need a more accurate output.

* Although there are now 3 PIO units each one still has only 32 words of
program memory (which was very limiting in the Pico). I assume that
because the RP2350 is supposed to be software compatible meaning, among
other things, that it should run RP2040 PIO code.

That does look to be the case.  Looks like the original RP2040 design
optimised them into a corner that's difficult to get out of.

Theo