main.cpp

#include <Audio.h>
#include <SPI.h>

const unsigned char CS1 = 31;
const unsigned char SCK1 = 32;
const unsigned char MOSI1 = 0;

// GUItool: begin automatically generated code
AudioInputUSB usb1;           //xy=105,92
AudioOutputI2S i2s1;           //xy=270,87
AudioConnection patchCord1(usb1, 0, i2s1, 0);
AudioConnection patchCord2(usb1, 1, i2s1, 1);
// GUItool: end automatically generated code

void setup()
{
	// put your setup code here, to run once:
	// Audio connections require memory to work.  For more
	// detailed information, see the MemoryAndCpuUsage example
	AudioMemory(24);
}

void writeReg(unsigned char address, unsigned char value)
{
	SPI1.beginTransaction(SPISettings(1000000, MSBFIRST, SPI_MODE3));
	// take the SS pin low to select the chip:
	digitalWrite(CS1, LOW);
	delay(1);
	//  send in the address and value via SPI:
	SPI1.transfer(address);
	SPI1.transfer(value);
	// take the SS pin high to de-select the chip:
	digitalWrite(CS1, HIGH);
	// release control of the SPI port
	SPI1.endTransaction();
	delay(1);
}

void loop()
{
	// put your main code here, to run repeatedly:

	pinMode(CS1, OUTPUT);
	SPI1.begin();
	delay(100);
	writeReg(0b01100000, 0b10001110); //Reset
	writeReg(0b01100000, 0b10001111); //Enable I2S data format on AK4381
	//delay(1);
	//writeReg(0b11100000, 0b10010110); //Enable I2S data format on AK4355
	//writeReg(0b11100000, 0b10010111); //Enable I2S data format on AK4355

	writeReg(0b01100011, 40);
	writeReg(0b01100100, 40);

	while (1)
	{
		if (AudioInputUSB::features.change)
		{
			AudioInputUSB::features.change = 0;

			unsigned char vol = AudioInputUSB::features.volume / 32;
			if (AudioInputUSB::features.mute) vol = 0;
			writeReg(0b01100011, vol);
			writeReg(0b01100100, vol);
			//delay(1);

		}
	}

}

void abort()
{
	while (1)
		;
}