dac.hpp

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  * This software can be used by students and other personal of the *
  * Bern University of Applied Sciences under the terms of the MIT  *
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#pragma once
 
#include <cpp/common/frontend/dac.hpp>
 
#include <cmath>
 
namespace bsp::mid::drv {
 
    template<auto Context, u8 Index, u32 Offset, u32 MaxValue>
    struct DACChannel {
        DACChannel(const DACChannel&) = delete;
        auto operator=(const DACChannel&) = delete;
 
        constexpr static auto ReferenceVoltage = 3.3;
 
        static bool init() {
            return true;
        }
 
        static bool deinit() {
            return true;
        }
 
        auto operator=(float value) const noexcept {
            constexpr auto Channel = getHALChannel();
            HAL_DAC_SetValue(Context, Channel, DAC_ALIGN_12B_R, u32(std::max(value * MaxValue - Offset, 0.0F)));
            HAL_DAC_Start(Context, Channel);
        }
 
        operator float() const noexcept {
            constexpr auto Channel = getHALChannel();
 
            return float(std::max(HAL_DAC_GetValue(Context, Channel) + Offset, 0)) / MaxValue;
        }
 
    private:
        DACChannel() = default;
 
        constexpr static u32 getHALChannel() {
            switch (Index) {
                case 1:  return DAC_CHANNEL_1;
                case 2:  return DAC_CHANNEL_2;
                default: bsp::unreachable();
            }
        }
 
        template<auto, template<auto, u8, u32, u32> typename>
        friend struct bsp::drv::DAConverter;
    };
 
}