Improve the IQ sample Matlab script

For displaying and saving I/Q sample captured by openwifi side channel feature

user_space/side_ch_ctl_src/save_iq_to_txt_for_verilog_sim.m

@@ -0,0 +1,39 @@
+% Xianjun Jiao. xianjun.jiao@imec.be; putaoshu@msn.com
+
+function save_iq_to_txt_for_verilog_sim(mat_filename, varargin)
+a = load(mat_filename);
+var_names = fieldnames(a);
+var_cells = struct2cell(a);
+[len_iq, num_frame] = size(var_cells{1});
+
+if nargin>=2
+    idx_set = varargin{1};
+else
+    idx_set = 1:num_frame;
+end
+
+if nargin >= 3
+    sp = varargin{2}(1);
+    ep = varargin{2}(2);
+else
+    sp = 1;
+    ep = len_iq;
+end
+
+for name_idx = 1 : length(var_names)
+    filename_txt = [var_names{name_idx} '.txt'];
+    fid = fopen(filename_txt,'w');
+    if fid == -1
+        disp('fopen failed');
+        return;
+    end
+    var_tmp = var_cells{name_idx};
+    for j=1:length(idx_set)
+        idx = idx_set(j);
+        iq = var_tmp(:,idx);
+        for i=sp:ep
+            fprintf(fid, '%d %d\n', round(real(iq(i))), round(imag(iq(i))));
+        end
+    end
+    fclose(fid);
+end

user_space/side_ch_ctl_src/test_iq_2ant_file_display.m

@@ -1,10 +1,15 @@
 % Xianjun Jiao. xianjun.jiao@imec.be; putaoshu@msn.com
 
-clear all;
+% clear all;
-close all;
+% close all;
+function test_iq_2ant_file_display(varargin)
 
-% iq_len = 8187; % default for big fpga
+if nargin == 0
-iq_len = 4095; % for small fpga
+    iq_len = 8187; % default for big fpga
+    % iq_len = 4095; % for small fpga
+else
+    iq_len = varargin{1};
+end
 
 a = load('iq_2ant.txt');
 len_a = floor(length(a)/4)*4;
@@ -16,14 +21,17 @@ num_iq_capture = floor(size(b,1)/num_data_in_each_iq_capture);
 
 iq0_capture =   zeros(iq_len, num_iq_capture);
 iq1_capture =   zeros(iq_len, num_iq_capture);
+timestamp   =   zeros(1, num_iq_capture);
 
 for i=1:num_iq_capture
     sp = (i-1)*num_data_in_each_iq_capture + 1;
     ep = i*num_data_in_each_iq_capture;
     timestamp(i) = b(sp,1) + (2^16)*b(sp,2) + (2^32)*b(sp,3) + (2^48)*b(sp,4);
-    iq0_capture(:,i) = b((sp+1):ep,1) + 1i.*b((sp+1):ep,2);
+    iq0_capture(:,i) = 1i.*b((sp+1):ep,1) + b((sp+1):ep,2);
-    iq1_capture(:,i) = b((sp+1):ep,3) + 1i.*b((sp+1):ep,4);
+    iq1_capture(:,i) = 1i.*b((sp+1):ep,3) + b((sp+1):ep,4);
 end
+save(['iq_2ant_' num2str(iq_len) '.mat'], 'iq0_capture', 'iq1_capture');
+
 iq0_capture = iq0_capture(:);
 iq1_capture = iq1_capture(:);
 
@@ -38,7 +46,7 @@ plot(real(iq1_capture)); hold on; plot(imag(iq1_capture),'r'); title('rx1 I (blu
 figure;
 a = abs(iq0_capture);
 b = abs(iq1_capture);
-a(a==0) = max(b);
+% a(a==0) = max(b);
 plot(a); hold on;
 plot(b,'r'); title('rx0 and rx1 abs'); xlabel('sample'); ylabel('abs'); grid on;
 legend('rx0','rx1');

user_space/side_ch_ctl_src/test_iq_file_display.m

@@ -1,9 +1,15 @@
 % Xianjun Jiao. xianjun.jiao@imec.be; putaoshu@msn.com
 
-clear all;
+% clear all;
-close all;
+% close all;
 
-iq_len = 8187;
+function test_iq_file_display(varargin)
+
+if nargin == 0
+    iq_len = 8187;
+else
+    iq_len = varargin{1};
+end
 
 a = load('iq.txt');
 len_a = floor(length(a)/4)*4;
@@ -22,10 +28,12 @@ for i=1:num_iq_capture
     sp = (i-1)*num_data_in_each_iq_capture + 1;
     ep = i*num_data_in_each_iq_capture;
     timestamp(i) = b(sp,1) + (2^16)*b(sp,2) + (2^32)*b(sp,3) + (2^48)*b(sp,4);
-    iq_capture(:,i) = b((sp+1):ep,1) + 1i.*b((sp+1):ep,2);
+    iq_capture(:,i) = 1i.*b((sp+1):ep,1) + b((sp+1):ep,2);
     agc_gain(:,i) = b((sp+1):ep,3);
     rssi_half_db(:,i) = b((sp+1):ep,4);
 end
+save(['iq_' num2str(iq_len) '.mat'], 'iq_capture');
+
 iq_capture = iq_capture(:);
 agc_gain = agc_gain(:);
 rssi_half_db = rssi_half_db(:);