%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Generating a Frequency Sweep with Continous Transmission using Warplab
% (SISO COnfiguration)
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% To run this code the boards must be programmed with the
% warplab_siso_v02.bit bitstream

% The specific steps implemented in this script are the following

% 0. Initializaton and definition of parameters
% 1. Generate a vector of samples to transmit and send the samples to the 
% Warp board (Sample Frequency is 40MHz).  Vector represents a sinusoid
% with frequency linearly increasing in time.
% 2. Prepare boards for transmission and reception and send trigger to 
% start transmission and reception (trigger is the SYNC packet)
% 3. Leave continuous transmitter on for n seconds and then stop continuous
% transmission.
% 4. Read the received samples from the Warp board.
% 5. Reset and disable the boards.
% 6. Plot the transmitted and received data.


% In this lab exercise you will write a matlab script that implements the
% seven steps above. Part of the code is provided, some part of the code you
% will write. Read the code below and fill in with your code wherever you 
% are asked to do so.

% NOTE: To avoid conflict with other groups using the boards, please test 
% the code you write in this script in any of the following three ways:
%
% Option 1. Run this script from matlab's Command Window by entering the 
% name of the script (enter warplab_example_TxRx_WorkshopExercise in 
% matlab's Command Window).
% Option 2. In the menu bar go to Debug and select Run. If there
% are errors in the code, error messages will appear in the Command Window.
% Option 3. Press F5. If the are errors in the code, error messages will 
% appear in the Command Window.
%
% DO NOT USE the Evaluate selection option and DO NOT run the script by
% sections. To test any change, always run the whole script by following 
% any of the three options above.

try,
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Code to avoid conflict between users, only needed for the workshop, go to
% step 0 below to start the initialization and definition of parameters
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
fid = fopen('c:\boards_lock.txt');

if(fid > -1)
    fclose('all');
	errordlg('Boards already in use - Please try again!');
	return;
end

!echo > c:\boards_lock.txt

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% 0. Initializaton and definition of parameters
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%Load some global definitions (packet types, etc.)
warplab_defines

% Create Socket handles and intialize nodes
[socketHandles, packetNum] = warplab_initialize;

%Separate the socket handles for easier access
% The first socket handle is always the magic SYNC
% The rest can be arranged in any combination of Tx and Rx
udp_Sync = socketHandles(1);
udp_Tx = socketHandles(2);
udp_RxA = socketHandles(3);

% Define the warplab options (parameters)
CaptOffset = 1000; %Number of noise samples per Rx capture; in [0:2^14]
TxLength = 2^14-1000; %Length of transmission; in [0:2^14-CaptOffset]
TransMode = 1; %Transmission mode; in [0:1] 
               % 0: Single Transmission 
               % 1: Continuous Transmission. Tx board will continue 
               % transmitting the vector of samples until the user manually
               % disables the transmitter.
CarrierChannel = 8; % Channel in the 2.4 GHz band. In [1:14]
TxGainBB = 3; %Tx Baseband Gain in [0:3]
TxGainRF = 40; %Tx RF Gain in [0:63]
RxGainBB = 15; %Rx Baseband Gain in [0:31]
RxGainRF = 1; %Rx RF Gain in [1:3]

% Define the options vector; the order of options is set by the FPGA's code
% (C code)
optionsVector = [CaptOffset TxLength-1 TransMode CarrierChannel (RxGainBB + RxGainRF*2^16) (TxGainRF + TxGainBB*2^16)]; 
% Send options vector to the nodes
warplab_setOptions(socketHandles,optionsVector);

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% 1. Generate a vector of samples to transmit and send the samples to the 
% Warp board (Sample Frequency is 40MHz).  Vector represents a sinusoid
% with complex frequency linearly increasing in time.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Prepare some data to be transmitted
t = 0:(1/40e6):TxLength/40e6 - 1/40e6; % Create time vector.
f = -2e6:(4e6/TxLength):2e6 - 1; % Create frequency vector (Sweeps from 
% 1MHz to 5MHz)  Time and frequency vectors must have the same length.
TxData = exp(j*2*pi*f.*t); % Create a signal to transmit. Signal must be a
% row vector. The signal can be real or complex, the only constraint is
% that the amplitude of the real part must be in [-1:1] and the amplitude 
% of the imaginary part must be in [-1:1]

% Download the samples to be transmitted
warplab_writeSMWO(udp_Tx, TxData, RADIO2_TXDATA);

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% 2. Prepare boards for transmission and reception and send trigger to 
% start transmission and reception (trigger is the SYNC packet)
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Enable transmitter radio path in transmitter node
warplab_sendCmd(udp_Tx, RADIO2_TXEN, packetNum);

% Enable receiver radio path in receiver node
warplab_sendCmd(udp_RxA, RADIO2_RXEN, packetNum);

% Prime transmitter state machine in transmitter node. Transmitter will be 
% waiting for the SYNC packet. Transmission will be triggered when the 
% transmitter node receives the SYNC packet.
warplab_sendCmd(udp_Tx, TX_START, packetNum);

% Prime receiver state machine in receiver node. Receiver will be waiting 
% for the SYNC packet. Capture will be triggered when the receiver 
% node receives the SYNC packet.
warplab_sendCmd(udp_RxA, RX_START, packetNum);

% Send the SYNC packet
warplab_sendSync(udp_Sync);

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% 3. Leave continuous transmitter on for n seconds and then stop continuous
% transmission and disable transmitter radio
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Leave continuous transmitter on for nsec seconds
nsec = 5;
pause(nsec);

% Stop transmission
warplab_sendCmd(udp_Tx, TX_STOP, packetNum); % Resets the output and read 
% address of the transmitter buffer without disabling the transmitter radio. 

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% 4. Read the received samples from the Warp board
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% In continuous transmitter mode the receiver stores CaptOffset samples of 
% noise and the first TxLength samples transmitted. 

% Read back the received samples
[RawRxData] = warplab_readSMRO(udp_RxA, RADIO2_RXDATA, TxLength+CaptOffset);
% Process the received samples to obtain meaningful data
[RxData,RxOTR] = warplab_processRawRxData(RawRxData);
% Read stored RSSI data
[RawRSSIData] = warplab_readSMRO(udp_RxA, RADIO2_RSSIDATA, (TxLength+CaptOffset)/8);
% Procecss Raw RSSI data to obtain meningful RSSI values
[RxRSSI] = warplab_processRawRSSIData(RawRSSIData);

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% 5. Reset and disable the boards
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Reset the receiver
warplab_sendCmd(udp_RxA, RX_DONEREADING, packetNum);

% Disable the receiver radio
warplab_sendCmd(udp_RxA, RADIO2_RXDIS, packetNum);

% Disable the transmitter radio
warplab_sendCmd(udp_Tx, RADIO2_TXDIS, packetNum);

% Close sockets
pnet('closeall');

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% 6. Plot the transmitted and received data
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%Plot Tx_I and Tx_Q data
figure;
subplot(4,2,1);
plot(real(TxData));
title('Tx I');
xlabel('n (samples)'); ylabel('Amplitude');
axis([0 2^14 -1 1]); % Set axis ranges.
subplot(4,2,3);
plot(imag(TxData));
title('Tx Q');
xlabel('n (samples)'); ylabel('Amplitude');
axis([0 2^14 -1 1]); % Set axis ranges.

%Plot Tx Spectrogram
subplot(4,2,[2,4])
specgram(TxData,1024,1);
title('Tx Spectrogram');
xlabel('n (samples)'); ylabel('Frequency');
axis([0 2^14 1e6/(40e6/2) 10e6/(40e6/2)]); % Set axis ranges.

%Plot Rx_I and Rx_Q data
subplot(4,2,5);
plot(real(RxData));
title('Rx I');
xlabel('n (samples)'); ylabel('Amplitude');
axis([0 2^14 -1 1]); % Set axis ranges.
subplot(4,2,7);
plot(imag(RxData));
title('Rx Q');
xlabel('n (samples)'); ylabel('Amplitude');
axis([0 2^14 -1 1]); % Set axis ranges.

%Plot Rx Spectrogram
subplot(4,2,[6,8])
specgram(RxData,1024,1);
title('Rx Spectrogram');
xlabel('n (samples)'); ylabel('Frequency');
axis([0 2^14 1e6/(40e6/2) 10e6/(40e6/2)]); % Set axis ranges.

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Code to avoid conflict between users, only needed for the workshop
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
pnet('closeall');
!del c:\boards_lock.txt
catch,
% Close sockets
pnet('closeall');
!del c:\boards_lock.txt
lasterr
end