Feature Request: using another timer but 0 for "time-driver"

[mschnell1]

I started a project using an RP2350 chip based on embassy-rp.
I found that when specifying the embassy-rp feature "time-driver" my tests work just fine. Here embassy uses TIMER0 (as defined in rp235x/mod.rs.
Now the RP2350 features multiple timers. In fact I would like to use the "Always on" Timer for this battery powered project.
Feature request : It would be great if in the features a timer hardware could be selected.
For now I dropped the re-used the feature "time-driver" and created my own driver essentially by copying the code from embassy-rp/time_driver_rs. That works fine. Now researching on how to make it use TIMER1 and then the "Always On" timer.
Thanks for listening !

BTW.: Seemingly the AON Timer (denoted as TIMER in the RP2350 documentation seems not top be included in rp235x/mod.rs. ?!? (but POWMAN_IRQ_TIMER = 45 already is defined.) Supposedly the definitions in powman.rs should be used here. but how to decently use pac::POWMAN::inte() or similar for the AON Timer ?

[mschnell1]

As a first step I tried to use timer 1 instead of timer 0.
I found that the (mostly copied from the embassy sources) code with TIMER0, TIMER0_IORQ_0.enable() andfn TIMER0_IRQ_0() works fine and I can reach a breakpoinht at DRIVER.check_alarm().
I replaced TIMER0, TIMER0_IORQ_0.enable() andfn TIMER0_IRQ_0() by TIMER1, TIMER1_IORQ_0.enable() andfn TIMER1_IRQ_0(). Tist does compile, but now the breakpoint is not hit anymore.
What am I doing wrong ?

[mschnell1]

edit:
I found that I need to set the source for Timer 1 (while I did not find where embassy-rp sets the source for timer0, which somehow seems to be 1 msec by default). I did

        *TIMER.source().as_ptr() = p_pac::timer::regs::Source(1);

(don't know if that is the correct way. )
Now I get interrupts. But way to fast. ("1" is documented to be the full clock, while "0" is documented to be "default", which does not work.)

[mschnell1]

edit:
could get it running corrcetly by

    let timer0_freq = pac::TICKS.timer0_cycles().read().0;    
    pac::TICKS.timer1_cycles().write(|w| w.0 = timer0_freq );
    pac::TICKS.timer1_ctrl().write(|w| w.set_enable(true));

but I of course should use the clk_ref_freq defined in embassy/embassy-rp/src/clocks.rs. But I don't find a way to access this value.
Also see #3773

[mschnell1]

Once done, I may be able contribute an update to time-driver.rs that adheres to a feature defining which timer to use,

[mschnell1]

proceeding, I did find clocks::clk_ref_freq() :)
using TIMTER1 works and is done as desired. Now trying the AON Timer....