Arduino sketch for binding with Spektrum RC satellite receivers.

spektrum_sat_bind.pde

// Spektrum satellite binding
// quick test sketch by Sam Kelly, sam@3drobotics.com
// with info from rcgroups, mikrokopter, etc.

unsigned long time;
int inData[16];
int inByte;
int index = 0;

void setup()
{ 
  Serial.begin(115200); // to print data to the terminal
  SpektrumBind();       // to interface with the Spektrum sat
  Serial1.begin(115200);
}

void loop()
{
  while(Serial1.available() > 0)
  {
    for(index = 0; index <= 15; index++)
    {
      inByte = Serial1.read();
      inData[index] = inByte;
      Serial.print(inByte);
      Serial.print(" ");
    }
    Serial.println();
  }
}

void SpektrumBind(void)
{
  unsigned char connected = 0;
  
  UCSR1B &= ~(1 << TXCIE1); // disable Tx interrupt
  UCSR1B &= ~(1 << TXEN1);  // disable USART1 Tx
  PORTD &= ~(1 << PORTD3);  // disable pull-up
  DDRD |= (1 << DDD3);      // Tx as output
  PORTD |= (1 << PORTD3);   // Set HIGH to enable adapter regulator

  UCSR1B &= ~(1 << RXCIE1); // disable Rx interrupt
  UCSR1B &= ~(1 << RXEN1);  // disable USART1 Rx
  PORTD &= ~(1 << PORTD2);  // disable pull-up
 
  Serial.println("Spektrum Satellite binding test.");

  while(time <= 10000) // Wait 10 seconds for spektrum sat connection
  {
    time = millis();
    if(PIND & (1 << PORTD2))
    {
      connected = 1;
      break;
    }
  }

  if(connected)
  {
    Serial.println("Connected! Bind now!");
    DDRD |= (1 << DDD2); // Rx as output

    delay(90); // Delay after Rx startup
    
    // === Update 2011-08-18 ===
    // Bind mode data gathered from Spektrum DX8
    // 2 low pulses: DSM2 1024/22ms (this works with Doug Weibel's PPM Encoder firmware)
    // 3 low pulses: no result
    // 4 low pulses: DSM2 2048/11ms
    // 5 low pulses: no result
    // 6 low pulses: DSMX 22ms
    // 7 low pulses: no result
    // 8 low pulses: DSMX 11ms
    
    //PORTD |= (1 << PORTD2);  delayMicroseconds(116);
    //PORTD &= ~(1 << PORTD2); delayMicroseconds(116);
    //PORTD |= (1 << PORTD2);  delayMicroseconds(116);
    //PORTD &= ~(1 << PORTD2); delayMicroseconds(116);
    //PORTD |= (1 << PORTD2);  delayMicroseconds(116);
    //PORTD &= ~(1 << PORTD2); delayMicroseconds(116);
    //PORTD |= (1 << PORTD2);  delayMicroseconds(116);
    //PORTD &= ~(1 << PORTD2); delayMicroseconds(116);
    //PORTD |= (1 << PORTD2);  delayMicroseconds(116);
    //PORTD &= ~(1 << PORTD2); delayMicroseconds(116);
    PORTD |= (1 << PORTD2);  delayMicroseconds(116);
    PORTD &= ~(1 << PORTD2); delayMicroseconds(116);
    PORTD |= (1 << PORTD2);  delayMicroseconds(116);
    PORTD &= ~(1 << PORTD2); delayMicroseconds(116);
    PORTD |= (1 << PORTD2);  delayMicroseconds(116);
  }
  else
    Serial.println("Timeout.");

  DDRD &= ~(1 << DDD2); // Rx as input
  PORTD &= ~(1 << PORTD2);
}