Needs a TICK_RATE or similar way to figure out the frequency

[riskable]

Was trying to implement the infrared crate's MultiReceiver (https://docs.rs/infrared/0.13.0/infrared/receiver/struct.MultiReceiver.html) which requires the frequency of the monotonic timer you're using with it. Except there's no way to tell the tick rate/frequency when using rp2040-monotonic: It doesn't provide any constants or functions that would provide that info.

It was suggested by some guy 😁 in the RTIC Matrix chat that the monotonic timer implementation could provide this sort of info:

korken89
You do however have access to the monotonic's type, so if the monotonic implements it you can do MyMono::TICK_RATE

[korken89]

This is however not part of the Monotonic API.

It's probably better to implement a helper to extract the const generic from the type.

[riskable]

I think having a little helper function inside impl Rp2040Monotonic that returns the tick rate would be totally fine. Put const TICK_RATE: usize = 1_000_000; at the top of lib.rs and then add something like:

pub fn tick_rate() -> usize {
    TICK_RATE
}

...just below new() in impl Rp2040Monotonic. Or alternatively, just put pub const TICK_RATE: usize = 1_000_000; at the top of lib.rs (and use it inside impl Monotonic for Rp2040Monotonic):

    type Instant = fugit::TimerInstantU64<{ TICK_RATE }>;
    type Duration = fugit::TimerDurationU64< { TICK_RATE }>;

Just having the tick rate be available via rp2040-monotonic::TICK_RATE would suffice, honestly.

[korken89]

Yes if you want to fix it specifically for this monotonic, however what I'm gesturing at is that it is not a portable solution. :)
For it to be portable, either across RTIC's monotonics or fugit, the fix should be there.