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[internal-adc] Internal ADC driver rewrite

Alberto Nidasio requested to merge adc-dev into sensors-dev

Rewritten the internal ADC driver with the new sensor interface and implemented multiple channel readings and DMA.

The ADC can work with or without DMA:

  • Up to 4 channels without DMA
  • Up to 16 channels with DMA

The stm32 ADCs also have access to an internal temperature sensor, it is not implemented.

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