Pebble - Average AccelData for an array of Accelerometer Inputs

avg_accel.c

// Returns the mathematical mean (average) of a number of samples of accelerometer data.
// Sets the x, y, and z values as a mean. 
// Sets 'did_vibrate' to true if the pebble vibrated during any of the samples.
// Time stamp is set to the time stamp of the first sample.
AccelData accel_data_mean(AccelData *data, uint32_t num_samples) {
  // Declare the struct
  AccelData average_data;
  
  // Time taken is set to the first sample's time
  average_data.timestamp = data[0].timestamp; 
  // Initialize x, y, and z values
  average_data.x = average_data.y = average_data.z = 0; 
  
  // Calculate the sum of the x, y, and z values.
  for (uint32_t i = 0; i < num_samples; i++) {
    average_data.x += data[i].x;
    average_data.y += data[i].y;
    average_data.z += data[i].z;
    
    // If any sample was taken during a vibration, the value of the mean is set to vibrate
    if (data[i].did_vibrate) { 
      average_data.did_vibrate = true;
    }
  }
  
  // Divide by number of samples to get the average
  average_data.x /= num_samples;
  average_data.y /= num_samples;
  average_data.z /= num_samples;
  
  return average_data;
}