marantz-demo.ino

// marantz wired remote control demo
// inspired by https://github.com/Arduino-IRremote/Arduino-IRremote
// see https://smallhacks.wordpress.com/2021/07/07/controlling-marantz-amplifier-using-arduino-via-remote-socket/

/* some definitions from the IRremote Arduino Library */
#define RC5_ADDRESS_BITS 5
#define RC5_COMMAND_BITS 6
#define RC5_EXT_BITS 6
#define RC5_COMMAND_FIELD_BIT 1
#define RC5_TOGGLE_BIT 1
#define RC5_BITS (RC5_COMMAND_FIELD_BIT + RC5_TOGGLE_BIT + RC5_ADDRESS_BITS + RC5_COMMAND_BITS)  // 13
#define RC5X_BITS (RC5_BITS + RC5_EXT_BITS) // 19
#define RC5_UNIT 889  // (32 cycles of 36 kHz)
#define RC5_DURATION (15L * RC5_UNIT)  // 13335
#define RC5_REPEAT_PERIOD (128L *RC5_UNIT)  // 113792
#define RC5_REPEAT_SPACE (RC5_REPEAT_PERIOD - RC5_DURATION)  // 100 ms

#define IR_TX_PIN 5 // pin to use for tx

//#define TRACE // print binary commands to serial

uint8_t sLastSendToggleValue = 0;

/* 
 *  normal Philips RC-5 as in the https://en.wikipedia.org/wiki/RC-5
 *  code taken from IRremote with some changes
 */

int sendRC5(uint8_t aAddress, uint8_t aCommand, uint_fast8_t aNumberOfRepeats)
{

  digitalWrite(IR_TX_PIN, LOW);

  uint16_t tIRData = ((aAddress & 0x1F) << RC5_COMMAND_BITS);

  if (aCommand < 0x40)
  {
    // set field bit to lower field / set inverted upper command bit
    tIRData |= 1 << (RC5_TOGGLE_BIT + RC5_ADDRESS_BITS + RC5_COMMAND_BITS);
  }
  else
  {
    // let field bit zero
    aCommand &= 0x3F;
  }

  tIRData |= aCommand;

  tIRData |= 1 << RC5_BITS;

  if (sLastSendToggleValue == 0)
  {
    sLastSendToggleValue = 1;
    // set toggled bit
    tIRData |= 1 << (RC5_ADDRESS_BITS + RC5_COMMAND_BITS);
  }
  else
  {
    sLastSendToggleValue = 0;
  }

  uint_fast8_t tNumberOfCommands = aNumberOfRepeats + 1;

  while (tNumberOfCommands > 0)
  {
    for (int i = 13; 0 <= i; i--)
    {
#ifdef TRACE
      Serial.print((tIRData &(1 << i)) ? '1' : '0');
#endif
        (tIRData &(1 << i)) ? send_1() : send_0();
    }
    tNumberOfCommands--;
    if (tNumberOfCommands > 0)
    {
      // send repeated command in a fixed raster
      delay(RC5_REPEAT_SPACE / 1000);
    }
#ifdef TRACE
    Serial.print("\n");
#endif
  }

  digitalWrite(IR_TX_PIN, LOW);
  return 0;
}

/* 
 *  Marantz 20 bit RC5 extension, see 
 *  http://lirc.10951.n7.nabble.com/Marantz-RC5-22-bits-Extend-Data-Word-possible-with-lircd-conf-semantic-td9784.html 
 *  could be combined with sendRC5, but ATM split to simplify debugging
 */
 
int sendRC5_X(uint8_t aAddress, uint8_t aCommand, uint8_t aExt, uint_fast8_t aNumberOfRepeats)
{

  uint32_t tIRData = (uint32_t)(aAddress & 0x1F) << (RC5_COMMAND_BITS + RC5_EXT_BITS);

  digitalWrite(IR_TX_PIN, LOW);

  if (aCommand < 0x40)
  {
    // set field bit to lower field / set inverted upper command bit
    tIRData |= (uint32_t) 1 << (RC5_TOGGLE_BIT + RC5_ADDRESS_BITS + RC5_COMMAND_BITS + RC5_EXT_BITS);
  }
  else
  {
    // let field bit zero
    aCommand &= 0x3F;
  }

  tIRData |= (uint32_t)(aExt & 0x3F);
  tIRData |= (uint32_t) aCommand << RC5_EXT_BITS;
  tIRData |= (uint32_t) 1 << RC5X_BITS;

  if (sLastSendToggleValue == 0)
  {
    sLastSendToggleValue = 1;
    // set toggled bit
    tIRData |= (uint32_t) 1 << (RC5_ADDRESS_BITS + RC5_COMMAND_BITS + RC5_EXT_BITS);
  }
  else
  {
    sLastSendToggleValue = 0;
  }

  uint_fast8_t tNumberOfCommands = aNumberOfRepeats + 1;

  while (tNumberOfCommands > 0)
  {

    for (int i = 19; 0 <= i; i--)
    {
#ifdef TRACE
      Serial.print((tIRData &((uint32_t) 1 << i)) ? '1' : '0');
#endif
        (tIRData &((uint32_t) 1 << i)) ? send_1() : send_0();
      if (i == 12)
      {
#ifdef TRACE
        Serial.print("<p>");
#endif
        // space marker for marantz rc5 extension
        delayMicroseconds(RC5_UNIT *2 *2);
      }
    }
#ifdef TRACE
    Serial.print("\n");
#endif
    tNumberOfCommands--;
    if (tNumberOfCommands > 0)
    {
      // send repeated command in a fixed raster
      delay(RC5_REPEAT_SPACE / 1000);
    }
  }
  digitalWrite(IR_TX_PIN, LOW);
  return 0;
}

void setup()
{
  //start serial connection
  Serial.begin(115200);
  // configure output pin
  pinMode(IR_TX_PIN, OUTPUT);
}

void send_0()
{
  digitalWrite(IR_TX_PIN, HIGH);
  delayMicroseconds(RC5_UNIT);
  digitalWrite(IR_TX_PIN, LOW);
  delayMicroseconds(RC5_UNIT);
}

void send_1()
{
  digitalWrite(IR_TX_PIN, LOW);
  delayMicroseconds(RC5_UNIT);
  digitalWrite(IR_TX_PIN, HIGH);
  delayMicroseconds(RC5_UNIT);
}

void loop()
{
  // demo to switch outputs and turn device on/off
  sendRC5(21, 63, 1); // phono
  delay(500);
  sendRC5(20, 63, 1); // cd
  delay(500);
  sendRC5(17, 63, 1); // tuner
  delay(500);
  sendRC5_X(16, 0, 6, 1); // aux1
  delay(500);
  sendRC5_X(16, 0, 7, 1); // aux2
  delay(500);
  sendRC5(16, 12, 1); // standby
  delay(2000);
}

I don't suppose you'd know how to find the RC5 values for the "Optical 1" input on the PM6007 amp? I've been searching like crazy and had zero luck.

@anker2000 I was using a logic analyzer with my own rc5 decoder. I never completed it to the stage where it's fine to upstream it.

Also you can just try to write program to check all the codes, i don't think it could harm.

Hi,
I am having issues with sending the codes for commands without an extension.
Thanks, at least this program did turn off my ampl. and was able to mute and unmute. Other commands failed.
I am having issues with sending the codes for commands without an extension. The power-on does not work in for my SR5004 amplifiers.
Also tried codes for Direct Volume, without succes. I hope you have a fix for this maybe.

Hi, I am having issues with sending the codes for commands without an extension. Thanks, at least this program did turn off my ampl. and was able to mute and unmute. Other commands failed. I am having issues with sending the codes for commands without an extension. The power-on does not work in for my SR5004 amplifiers. Also tried codes for Direct Volume, without succes. I hope you have a fix for this maybe.

Hi, for tuning on, did you try using all three different power signals? And did you disable the remote control signal receiving function on your amp?