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#pragma once
#include <stdint.h>
#include <functional>
#include "esp_err.h"
#include "result.hpp"
#include "gpio_expander.hpp"
namespace drivers {
/**
* Interface for a PCM5122PWR DAC, configured over I2C.
*/
class AudioDac {
public:
enum Error {
FAILED_TO_BOOT,
FAILED_TO_CONFIGURE,
};
static auto create(GpioExpander* expander)
-> cpp::result<std::unique_ptr<AudioDac>, Error>;
AudioDac(GpioExpander* gpio);
~AudioDac();
/**
* Sets the volume on a scale from 0 (loudest) to 254 (quietest). A value of
* 255 engages the soft mute function.
*/
void WriteVolume(uint8_t volume);
enum PowerState {
POWERDOWN = 0b0,
WAIT_FOR_CP = 0b1,
CALIBRATION_1 = 0b10,
CALIBRATION_2 = 0b11,
RAMP_UP = 0b100,
RUN = 0b101,
SHORT = 0b110,
RAMP_DOWN = 0b111,
STANDBY = 0b1000,
};
/* Returns the current boot-up status and internal state of the DAC */
std::pair<bool, PowerState> ReadPowerState();
// Not copyable or movable.
AudioDac(const AudioDac&) = delete;
AudioDac& operator=(const AudioDac&) = delete;
private:
GpioExpander* gpio_;
/*
* Pools the power state for up to 10ms, waiting for the given predicate to
* be true.
*/
bool WaitForPowerState(std::function<bool(bool, PowerState)> predicate);
enum Register {
PAGE_SELECT = 0,
DE_EMPHASIS = 7,
DIGITAL_VOLUME_L = 61,
DIGITAL_VOLUME_R = 62,
DSP_BOOT_POWER_STATE = 118,
};
void WriteRegister(Register reg, uint8_t val);
};
} // namespace drivers
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