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72 lines
1.7 KiB
72 lines
1.7 KiB
#pragma once
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#include "esp_err.h"
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#include "gpio-expander.h"
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#include <stdint.h>
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#include <functional>
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namespace gay_ipod {
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static const uint8_t kPCM5122Address = 0x4C;
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static const uint8_t kPCM5122Timeout = 100 / portTICK_RATE_MS;
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/**
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* Interface for a PCM5122PWR DAC, configured over I2C.
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*/
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class AudioDac {
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public:
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AudioDac(GpioExpander *gpio);
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~AudioDac();
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/**
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* Performs initial configuration of the DAC and sets it to begin expecting
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* I2S audio data.
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*/
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esp_err_t Start();
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/**
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* Sets the volume on a scale from 0 (loudest) to 254 (quietest). A value of
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* 255 engages the soft mute function.
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*/
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void WriteVolume(uint8_t volume);
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enum PowerState {
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POWERDOWN = 0b0,
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WAIT_FOR_CP = 0b1,
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CALIBRATION_1 = 0b10,
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CALIBRATION_2 = 0b11,
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RAMP_UP = 0b100,
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RUN = 0b101,
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SHORT = 0b110,
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RAMP_DOWN = 0b111,
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STANDBY = 0b1000,
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};
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/* Returns the current boot-up status and internal state of the DAC */
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std::pair<bool,PowerState> ReadPowerState();
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// Not copyable or movable.
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AudioDac(const AudioDac&) = delete;
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AudioDac& operator=(const AudioDac&) = delete;
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private:
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GpioExpander *gpio_;
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/*
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* Pools the power state for up to 10ms, waiting for the given predicate to
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* be true.
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*/
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bool WaitForPowerState(std::function<bool(bool,PowerState)> predicate);
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enum Register {
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PAGE_SELECT = 0,
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DE_EMPHASIS = 7,
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DIGITAL_VOLUME_L = 61,
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DIGITAL_VOLUME_R = 62,
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DSP_BOOT_POWER_STATE = 118,
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};
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void WriteRegister(Register reg, uint8_t val);
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};
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} // namespace gay_ipod
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