espp/adc

# ADC (Analog to Digital Converter) Component This component provides some classes which encapsulate analog value sampling using the ESP's built-in ADC hardware and peripheral drivers. ## Oneshot ADC The `OneshotAdc` allows the user a simple, low-resource way to sporadically (and with moderate frequency needs) measure an analog voltage for multiple channels on a single ADC UNIT. It does not start or manage any tasks and does not perform any filtering on the data. Each time the user calls `read_raw(adc_channel_t)` or `read_mv(adc_channel_t)`, it block and trigger an analog read for the associated channel (if it was configured to do so). ## Continuous ADC The `ContinuousAdc` provides a mechanism for high-frequency, continuous, deterministic sampling of analog voltages for multiple channels (potentially across multiple ADC units, depending on the ESP32 chip used). It does this be enabling the continuous ADC DMA mode and then running its own task which retrieves the data and filters it. When the user calls `get_mv(adc_channel_t)`, it simply returns the most recent filtered value for that channel, if it was configured. ## Example There is an [example](./example) which shows the use of the `espp::OneshotAdc` and the `espp::ContinuousAdc` components.

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License: MIT

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