Reads internal and external ADC channels.
Internal Vref and temperature tested, external Vbat tested.
Expect temperature to be inaccurate as the AT chips don't come with
per chip calibration.
External current and the generic 'external' channels haven't been tested.
* AT32F435: new target (#12159)
* AT32F435: New target (WIP)
* IO and Timer Updates
* Adding pseudonyms for the STM TypeDef items.
- implementation to follow
* Adding config_streamer support for AT32
* Implementation for IO
* Adding in Peripheral mapping from emsr.
* Warnings cleanup for AT drivers
* Getting things to the linking stage
* Add AT-START-F435 LEDs as default in AT32F435 as a temporary measure to aid bringup
* Remove tabs
* Enable selection of serial port to use for MSP
* Setup defaults for AT-START-F435 to use MSP on UART1
* Fix for most recent 4.5.0 Makefile changes
* Solve for sanity check.
* Add AT32F435 MCU type
* Fix compilation issue with SITL
* Merge conflict resolution
* Minor cleanup
* Adding line feed.
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Co-authored-by: Steve Evans <Steve@SCEvans.com>
