##Sanity check A_u
    [p_c.N_u,M_u] = size(p_c.A_u);
    if (p_c.N_u<>M_u)
      error("A_u must be square");
    endif
    
    
    U = K_w*w;			# Initial control U

    ## Checks
    [ol_zeros, ol_poles] = sys2zp(sys)
    cl_poles = eig(A - B*k_x)
  endif

  ## Observer design
  Ad = expm(A*p_c.delta_ol);		# Discrete-time transition matrix
  if (ControlType==2)		# 
    G = eye(n_x);		# State noise gain 
    sigma_x = eye(n_x);		# State noise variance
    Sigma = p_o.sigma*eye(n_y);	# Measurement noise variance
    
    [L, M, P, obs_poles] = dlqe(Ad,G,C,sigma_x,Sigma);
  else
    L = zeros(n_x,n_y);
    obs_poles = eig(Ad);
  endif
  
  ## Display the poles
  obs_poles

  ## Short sample interval
  dt = p_c.delta_ol/p_c.N;

  ## Write the include file for the real-time function
  disp("Writing Ustar.h");
  ppp_ustar2h(ppp_ustar (p_c.A_u, n_u, [0:dt:p_c.delta_ol], 0,0)); 


  ## Control loop
  y = [];
  u = [];
  t = [];
  y_e = [];
  t_e = [];
  e_e = [];
  tick = time;
  for i=1:I
    i
    if Simulate			# Exact simulation 
      t_sim = [0:p_c.N]*dt;	# Simulation time points
      [yi,ui,xsi] = ppp_ystar(A,B,C,D,x,p_c.A_u,U,t_sim); # Simulate
      x = xsi(:,p_c.N+1);	# Current state
      y_now = yi(:,p_c.N+1);	# Current output
    else			# The real thing
      to_rt(U');		# Send U
      data = from_rt(p_c.N);	# Receive data
      [yi,ui] = convert_data(data); # And convert from integer format
      y_now = yi(:,p_c.N);	# Current output
    endif

    ## Observer
    [x_est y_est e_est] = ppp_int_obs (x_est,y_now,U,A,B,C,D,p_c.A_u,p_c.delta_ol,L);
    
    ##Control
    U = K_w*w - K_x*x_est;

    ## Save data
    ti  = [(i-1)*p_c.N:i*p_c.N-1]*dt; 
    t = [t;ti'];
    y = [y;yi(:,1:p_c.N)'];
    u = [u;ui(:,1:p_c.N)'];
    y_e = [y_e; y_est'];
    t_e = [t_e; (i*p_c.N)*dt];
    e_e = [e_e; e_est];
  endfor			# Main loop
  
  sample_interval = (time-tick)/(I*p_c.N)

  ## Put data on file (so can use for identification)
  filename = sprintf("%s_ident_data.dat",Name);
  eval(sprintf("save -ascii %s t y u",filename));