mindwave.ino

/*
Display signal value, attention and relaxation value through UART serial port
 */
#define BAUDRATE 9600
#define DEBUGOUTPUT 0

// Checking related variables
int   generatedChecksum = 0;
byte  checksum = 0; 

// Receive data length and data array
byte  payloadLength = 0;
byte  payloadData[32] = {0};//Receive a total of 32 own data

// Information variable to be read
byte signalquality = 0;// signal quality
byte attention = 0;    // attention value
byte meditation = 0;   // relaxation value

// initialization
void setup() 
{
  Serial.begin(BAUDRATE); 
}

// Read a byte of data from the serial port
byte ReadOneByte() 
{
  int ByteRead;
  while(!Serial.available());
  ByteRead = Serial.read();
  return ByteRead; // Returns the bytes read
}

// Read serial data
void read_serial_data()
{
    // Look for packet start sync byte, 2
    if(ReadOneByte() == 0xAA)// Read one first
    {
      if(ReadOneByte() == 0xAA)// Read the second
      {
        payloadLength = ReadOneByte();// Read the third, packet byte length
        if(payloadLength == 0x20)// If it receives large packets of data, it will continue to read, and small packets of data will be discarded and not read.
        {
          generatedChecksum = 0; // Check variable cleared to 0       
          for(int i = 0; i < payloadLength; i++)// Read 32 bytes in a row
          {  
            payloadData[i] = ReadOneByte();// Read data from a specified length packet
            generatedChecksum += payloadData[i];// Calculate data accumulation sum
          }         
          checksum = ReadOneByte();// Read check byte  
          // check
          generatedChecksum = (~generatedChecksum)&0xff;       
          // Compare check byte
          if(checksum == generatedChecksum)// Data received correctly, continue processing
          {    
            signalquality = 0;// Signal quality variable
            attention = 0;    // Attention value variable
            // Assignment data
            signalquality = payloadData[1];// Signal value      
            attention = payloadData[29];// Attention value
            meditation = payloadData[31];// Relaxation value
            #if !DEBUGOUTPUT         
            // Print signal quality
            Serial.print("SignalQuality: ");
            Serial.print(signalquality, DEC);
            // Print attention value
            Serial.print("Attation: ");
            Serial.print(attention, DEC);
            // Print relaxation value
            Serial.print("Meditation: ");
            Serial.print(meditation, DEC);
            // Newline
            Serial.print("\n");       
            #endif              
          } 
        } 
      }
    }
}

// Main loop
void loop() 
{
  read_serial_data(); // Read serial data 
}