BALibrary/src/BAAudioControlWM8731.h

/**************************************************************************//**
 *  BAAudioContromWM8731 is a class for controlling a WM8731 Codec via I2C.
 *  @details The Codec power ups in a silent state, with non-optimal
 *  configuration. This class will enable codec and set some initial gain levels.
 *  The user can than use the API to changing settings for their specific needs.
 *
 *  @file
 *  @author Steve Lascos
 *  @company Blackaddr Audio
 *  @copyright This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.*
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *****************************************************************************/

#ifndef INC_BAAUDIOCONTROLWM8731_H_
#define INC_BAAUDIOCONTROLWM8731_H_

namespace BAGuitar {

constexpr int WM8731_NUM_REGS = 10; // Number of registers in the internal shadow array

/**************************************************************************//**
 * BAAudioControlWM8731 provides an API for configuring the internal registers
 * of the WM8731 codec.
 * @details Not every single command is provided, please ask if you need something
 * added that is not already present. You can also directly write any register
 * you wish with the writeI2C() method.
 *****************************************************************************/
class BAAudioControlWM8731 {
public:
	BAAudioControlWM8731();
	virtual ~BAAudioControlWM8731();

	/// Mute and power down the codec.
	void disable(void);

	/// First disable, then cleanly power up and unmute the codec.
	void enable(void);

	/// Set the input gain of the codec's PGA for the left (TRS Tip) channel.
	/// @param val an interger value from 31 = +12dB . . 1.5dB steps down to 0 = -34.5dB
	void setLeftInputGain(int val);

	/// Set the input gain of the codec's PGA for the right (TRS Ring) channel.
	/// @param val an interger value from 31 = +12dB . . 1.5dB steps down to 0 = -34.5dB
	void setRightInputGain(int val);

	/// Mute/unmute the Left (TRS Tip) channel at the ADC input.
	/// @param val when true, channel is muted, when false, channel is unmuted
	void setLeftInMute(bool val);

	/// Mute/unmute the Right (TRS Ring) channel at the ADC input.
	/// @param val when true, channel is muted, when false, channel is unmuted
	void setRightInMute(bool val);

	/// Links the Left/Right channel contols for mute and input gain.
	/// @details when true, changing either the left or right gain/mute controls will
	/// affect both channels.
	/// @param val when true, channels are linked, when false, they are controlled separately
	void setLinkLeftRightIn(bool val);
	/// Swaps the left and right channels in the codec.
	///param val when true, channels are swapped, else normal.
	void setLeftRightSwap(bool val);

	/// Mute/unmute the output DAC, affects both Left and Right output channels.
	/// @param when true, output DAC is muted, when false, unmuted.
	void setDacMute(bool val);

	/// Control when the DAC is feeding the output analog circuitry.
	/// @param val when true, the DAC output is connected to the analog output. When
	/// false, the DAC is disconnected.
	void setDacSelect(bool val);

	/// ADC Bypass control.
	/// @details This permits the analog audio from the Codec's PGA to bypass the ADC
	/// and go directly to the analog output of the codec, bypassing the digital domain
	/// entirely.
	/// @param val when true, analog ADC input is fed directly to codec analog otuput.
	void setAdcBypass(bool val);

	/// Digital High Pass Filter disable. RECOMMENDED ALWAYS TRUE!
	/// @details this controls a HPF in the codec that attempts to remove the lowest
	/// frequency (i.e. < 10 Hz) to improve headroom by dynamically measuring DC level.
	/// In most cases, it introduces noise components by modulating the filter. This
	/// is not suitable for applications where the audio is used for output, but might
	/// be useful for applications like tuning, pitch detection, whre the noise components
	/// can be tolerated.
	/// @param val when true (recommended) the dynamic HPF is disabled, otherwise enabled.
	void setHPFDisable(bool val);

    /// Activates the I2S interface on the codec.
	/// @param val when true, I2S interface is active, when false it is disabled.
	void setActivate(bool val);

	/// Soft-reset the codec.
	/// @details This will cause the codec to reset its internal registers to default values.
	void resetCodec(void);

	/// Write a custom command to the codec via I2C control interface.
	/// @details See WM8731 datasheet for register map details.
	/// @param addr The register address you wish to write to, range 0 to 15.
	/// @param val the 9-bit data value you wish to write at the address specifed.
	void writeI2C(unsigned int addr, unsigned int val);

protected:
	// A shadow array for the registers on the codec since the interface is write-only.
	int regArray[WM8731_NUM_REGS];

private:
	// low-level write command
	bool write(unsigned int reg, unsigned int val);
	// resets the internal shadow register array
	void resetInternalReg(void);

	bool m_wireStarted = false;

};

} /* namespace BAGuitar */

#endif /* INC_BAAUDIOCONTROLWM8731_H_ */