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STM32 ADCv1 driver.

Driver capability:

- Supports the STM32 "simple" ADC, the one found on small devices (F0, L0).

The file registry must export:

STM32_HAS_ADC1                  - ADC1 presence flag.
STM32_ADC_SUPPORTS_PRESCALER    - Support of CCR PRESC field.
STM32_ADC_SUPPORTS_OVERSAMPLING - Support of oversampling-related fields.
STM32_ADC1_IRQ_SHARED_WITH_EXTI - TRUE if the IRQ is shared with EXTI.
STM32_ADC1_HANDLER              - IRQ vector name.
STM32_ADC1_NUMBER               - IRQ vector number.
STM32_ADC1_DMA_MSK              - Mask of the compatible DMA channels.
STM32_ADC1_DMA_CHN              - Mask of the channels mapping.