Tracking issue to reduce boilerplate

[bugadani]

The goal of this issue is to lower the amount of code the users need to write for no good reason.

• Simplify initialization APIs #1957
• esp_hal_embassy: Implement timer conversion for some arrays #2012
• Rework hal initialization #1970
• Remove the need to manually pass clocks around #1999
• Remove most trait implementation features from esp-hal #2070
• SPI pins are no longer optional #2133
• Remove PcntSource #2134
• Type-erase timers by default #2136
• Type erase DMA channels from peripheral drivers #2248
• Remove SPI slave prelude #2260
• Type-erase peripheral instances where practical
  • SPI type erasure #2334
  • Erase TWAI #2359
  • Erase i2c peripheral instances #2361
  • Erase i2s #2367
  • Implement UART type erasure #2381
  • ADC
  • Timers
  • Add to API-GUIDELINES to design new drivers with erasure in mind.
• Automatically add rom_functions.x to the linker scripts #2339
• Include ROM API symbols #2374
• Remove FullDuplexMode and HalfDuplexMode type params #2373
• Resolve Remove new_..._async constructors #2321
• Resolve Remove new_with_config constructors where possible #2389
• [DMA 3/8] Remove ChannelCreator types, temporarily disable burst mode #2403
• [DMA 6/8] More helper types & working split #2532
• GPIO: do not overwrite interrupt handler #2486
• Remove pins from Io #2508

Feel free to share your pain point if you have any!

[scottdalgliesh]

Would it make sense to also initialize and return the io driver by default in esp_hal::init? It seems like most use cases will require access to io, but I could certainly be overlooking/misunderstanding something.

Regardless, great work on these simplifications - love to see it.

[bugadani]

^ a good thing to keep in mind, although we deliberately don't initialize any peripherals at this point.

[MabezDev]

I think we should think about closing this.

It's been great to track the "obviously" good choices (the init changes etc), but I think at this point most of the decisions we need to make going forward are non-trivial and require discussion before we commit to the design. We should track those in individual issues.

[bugadani]

I suppose I'll mark the last DMA PR to close this :)

[MabezDev]

I think with #2532 and #2321 we can now close this. Looking back at the list it's quite amazing how much boiler plate we managed to remove in a short timer period! 🚀