stm32f4xx-hal
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Request: add ADC example
ADC config on STM32 is quite involved, it would be good if there is a quick example about that.
There is actually a lot of information in docs: https://docs.rs/stm32f4xx-hal/0.8.3/stm32f4xx_hal/adc/struct.Adc.html. ADC over DMA example can be found from https://github.com/stm32-rs/stm32f4xx-hal/pull/186