STM32 Added a few timer functions

[Wratox]

Added a few functions to low level timer in order to avoid having to access the registers directly.

[Wratox]

I don't really get why the ci failed here, I checked RM0493, RM0515 and stm32-metapac docs and found no evidence that af1 is missing on any stm32wbaxxx processors.

Compiling embassy-stm32wba-examples v0.1.0 (/ci/code/examples/stm32wba)
error[E0599]: no method named `af1` found for struct `TimGp16` in the current scope
    --> /ci/code/embassy-stm32/src/timer/low_level.rs:1031:26
     |
1031 |         self.regs_gp16().af1().modify(|w| w.set_etrsel(val));
     |                          ^^^ method not found in `TimGp16`

Embassy-stm32 compiles fine for all of stm32wbaxxx and I even went as far as replacing stm32wba52cg in examples/stm32wba/Cargo.toml with every other variation of stm32wbaxxx but when I tried to compile the example some failed to compile due to different pinout but never because of the above error:

Processor	Status
stm32wba50ke	Error: no field PC13 on type Peripherals
stm32wba50kg	Error: no field PC13 on type Peripherals
stm32wba52ce	compiled
stm32wba52cg	compiled
stm32wba52ke	Error: no field PC13 on type Peripherals
stm32wba52kg	Error: no field PC13 on type Peripherals
stm32wba54ce	compiled
stm32wba54cg	compiled
stm32wba54ke	Error: no field PC13 on type Peripherals
stm32wba54kg	Error: no field PC13 on type Peripherals
stm32wba55ce	compiled
stm32wba55cg	compiled
stm32wba55he	Error: no field PC13 on type Peripherals
stm32wba55hg	Error: no field PC13 on type Peripherals
stm32wba55ue	compiled
stm32wba55ug	compiled
stm32wba62cg	Error: no field PA0 on type Peripherals
stm32wba62ci	Error: no field PA0 on type Peripherals
stm32wba62mg	compiled
stm32wba62mi	compiled
stm32wba62pg	compiled
stm32wba62pi	compiled
stm32wba63cg	compiled
stm32wba63ci	compiled
stm32wba64cg	Error: no field PA0 on type Peripherals
stm32wba64ci	Error: no field PA0 on type Peripherals
stm32wba65cg	Error: no field PA0 on type Peripherals
stm32wba65ci	Error: no field PA0 on type Peripherals
stm32wba65mg	compiled
stm32wba65mi	compiled
stm32wba65pg	compiled
stm32wba65pi	compiled
stm32wba65rg	compiled
stm32wba65ri	compiled

[Wratox]

I realized now it failed because of building with stm32l073rz which doesn't have the TIMx_AF1 register(nor does any of the STM32L0x3 processors after checking RM0367).

Would someone be able tell me if there are any other processors that doesn't have this register?
And if so, which ones?

[xoviat]

cfg(not(stm32l0))

[Wratox]

cfg(not(stm32l0))

Alright, thanks!