Set a PWM periodwith sub Hz granularity

[punkto]

I'm trying to leverage a PWM from a Blue Pill to play some notes on a buzzer. I have done this before in C+libopencm3 by adjusting the prescaler and the autoreload registers directly to reach a frequency near the musical note (if you are curious, here is an example: https://github.com/themightyteam/bluepill-examples/tree/master/examples/buzzer_music ).

Now I would like to do the same using this HAL, but so far I can only play full Hertz and I don't see a way to update directly the registers (example here: https://github.com/aindustriosa/RustyBugA/blob/7-add-buzzer-to-the-bsc/mightybuga_bsc/examples/no_bsc_buzzer.rs ).

So my questions are:

• Is this possible in a way I'm not aware of?
• If not, Is this an update you will welcome to the HAL or consider it too low level?
• If not, What would be the best way to implement it for my project? Use the PAC directly? Implement a new PWM trait?

Thanks in advance.

[TheZoq2]

This is probably closely related to #225 which has been open for a while.

Using the PAC directly would work for sure but is a bit annoying.

I'm not really involved in this repo much anymore so I can't directly comment on if we would want this in the HAL, but presumably we'd want it on the embedded-hal layer, not here for it to be done "properly".