/*
 * Digital Volume Control with NJR MUSES72320
 * 
 * The connections:
 *   DREF   (MUSES72320 pin 21)              - to Arduino's GND via a 10kOhm resistor (10k zit al op Muses bord)
 *   DVDD   (MUSES72320 pin 17)              - to +5V via a 10kOhm resistor (10k zit al op Muses bord)
 *   CLOCK  (MUSES72320 pin 19) (CTRL pin 3) - to digital pin D13 (SCK pin Nano Every)
 *   DATA   (MUSES72320 pin 18) (CTRL pin 4) - to digital pin D11 (MOSI pin Nano Every)
 *   LATCH  (MUSES72320 pin 20) (CTRL pin 5) - to digital pin D8 (SS pin Nano Every)
 *   Z/C    (MUSES72320 pin 32) (CTRL pin 8) - to digital pin D10 (can be any digital pin)
 *   5V (power for the arduino) (CTRL pin 2) - to 5V pin (it's ok to power a Nano Every this way. When using a UNO, Mega, and others, you may need to cut the 5V wire in the USB cable to avoid problems when connecting to a powered muses board)
 *   GND (pwr gnd arduino)      (CTRL pin 6) - to power GND pin
 *
 *   Pot - 0-5V to A0
 * 
 *  created 19 Dec 2024
 *  by erwinp
 Todo: ZC pin nog gebruiken? zero crossing
 */
// setup for MUSES 72320 control
#include <SPI.h>

#define SPIMAXATTNU 54784 // Take the binary from the datasheet and convert to ordinary number, SPI transfer do not care. -99db.
#define SPIMINATTNU 4096 // 0 db
#define SPIDEFAULTATTNU 29696 //50 db
#define SPIMUTE 65280
#define SPIINIT 32832 // Inital setup. Set L/R Cont1 = 1 for controlling both channels at the same time.

// Set SPI SS PIN 8 Arduino Nano Every. Other SPI pins are connected according to Arduino specification.
const int csPin = 8; //SS PIN

long Volume; //zelf toegevoegd
long oldVolume; //zelf toegevoegd
float VolumedB; //zelf toegevoegd
word VolBinary; 

void setMusesVolume(word regVal)
{
digitalWrite(csPin, LOW); // MUSES72320 datasheet seems to like to go low before transmission
  delayMicroseconds(1);
SPI.transfer(highByte (regVal)); // split the SPI transfer in high and lowbyte
SPI.transfer(lowByte (regVal));
  delayMicroseconds(1);
digitalWrite(csPin, HIGH);
}

void startMuses(){
 Serial.print(" startMuses: ") ;
 Serial.println("check");
SPI.begin();
SPI.setBitOrder(MSBFIRST);
SPI.setDataMode(SPI_MODE2);
// initialize SPI:
SPI.setClockDivider(SPI_CLOCK_DIV64); // Set correct speed for SPI muses chip

digitalWrite(csPin, LOW); // SPI SS PIN low - MUSES72320 datasheet seems like this go low before transmission
// SPI setup MUSES72320 l/r control
  delayMicroseconds(1);
SPI.transfer(highByte (SPIINIT)); //
SPI.transfer(lowByte (SPIINIT));
  delayMicroseconds(1);
digitalWrite(csPin, HIGH); // MUSES72320 datasheet seems like it go high after transmission
//setMusesVolume (SPIDEFAULTATTNU);
} 

void setup() {
 Serial.begin(9600); //voor debuggen
 pinMode(csPin, OUTPUT);
 digitalWrite(csPin, HIGH);
 delay(1000);
 startMuses();
}

void loop() {
 Volume = analogRead(A0);            // reads the value of the potentiometer (value between 0 and 1023)
 Volume = map(Volume, 0, 1023, 223, 0);     // scale it to the 223 steps between -111.5dB to 0dB
 	// volume to attenuation data conversion:
	// #=====================================#
	// |    0.0 dB | in: [  0] -> 0b00010000 |
	// | -111.5 dB | in: [223] -> 0b11101111 |
	// #=====================================#
 if (Volume != oldVolume) {
    VolBinary = (min(Volume, 223) + 0x10);
    setMusesVolume(VolBinary);
    VolumedB = -Volume*0.5;
    Serial.print(VolumedB) ;
    Serial.print("dB ") ;
    Serial.print(" VolBinary: ") ;
    // Serial.println(VolBinary,BIN);
    //Serial.println(VolBinary);
    for (int a=7; a >=0; a--) { 
    Serial.print ( bitRead (VolBinary, a));
    Serial.print ("");
    }
    Serial.println ("");
 }
 oldVolume = Volume;
 delay(50);
}