#include <Wire.h>                // for I2C

// defines for LM4970
#define LM4970_ADDR_0      0x7A  // first 7 bits of address 0 (ADR = LOW)
#define LM4970_ADDR_1      0x7B  // first 7 bits of address 1 (ADR = HIGH)

#define LM4970_MODE_NORM   0x00  // power up, normal I2C, no random
#define LM4970_MODE_RAND   0x04  // power up, normal I2C, random
#define LM4970_FREQ        0x50  // 6.3kHz High Pass / 15kHz PWM
#define LM4970_PATT_AUDIO  0x60  // pattern gen by audio input
#define LM4970_PATT_I2C    0x61  // pattern gen by I2C - all off
#define LM4970_CURR        0xAA  // 1x current (21mA)on LED 1-3
#define LM4970_GAIN        0xEA  // gain = 10dB / midband = medium


byte LM4970_Address = LM4970_ADDR_0; // using address 0 (ADR = LOW)

void setup() {
  Wire.begin(); 
  LM4970_Hello();                          // light up some LEDs in I2C mode
  LM4970_Init();                           // set for audio control of LEDs
}

void loop(){
  
}

void LM4970_Init(){  // Init based on #defines above
  Wire.beginTransmission(LM4970_Address);
  Wire.write(LM4970_MODE_NORM);             // set the mode
  Wire.write(LM4970_FREQ);                  // set the freq
  Wire.write(LM4970_PATT_AUDIO);            // set the pattern
  Wire.write(LM4970_CURR);                  // set the current
  Wire.write(LM4970_GAIN);                  // set the gain  
  Wire.endTransmission(); 
  delay(5);                                // safety - may not be needed
}

void LM4970_I2C_Led(boolean LED1,boolean LED2,boolean LED3){ // I2C control of LEDs
  byte pattern = LM4970_PATT_I2C;          // pattern set to I2C control - all off
  pattern |= LED1 << 1;                    // shift in status for LED1
  pattern |= LED2 << 2;                    // shift in status for LED2
  pattern |= LED3 << 3;                    // shift in status for LED3
  Wire.beginTransmission(LM4970_Address);
  Wire.write(pattern);                      // send the command for the LEDs to light
  Wire.write(LM4970_CURR);                  // set the current
  Wire.endTransmission(); 
  delay(5);                               // safety - may not be needed
}

void LM4970_Hello(){
  LM4970_I2C_Led(true,false,false);        // turn on LED-1
  delay(500);
  LM4970_I2C_Led(false,true,false);        // turn on LED-2
  delay(500);
  LM4970_I2C_Led(false,false,true);        // turn on LED-1
  delay(500);
  LM4970_I2C_Led(true,true,true);          // turn on all 3
  delay(1000);
  LM4970_I2C_Led(false,false,false);       // turn em off
  delay(1000);
}