validation: add checkCounterSamples and verify capture up to 1024 frames on ZCU111

Created checkCounterSamples.m to validate sample continuity, counter wraps,
and frame index progression. Verified counter bypass, sine bypass, and
channelizer modes up to nFrames=1024 across 10 DPWs on ZCU111.

codegen_frft/bizinter.m

@@ -0,0 +1,37 @@
+function xint=bizinter(x)
+
+N=length(x);
+im = 0;
+if sum(abs(imag(x)))>0
+  im = 1;
+  imx = imag(x);
+  x  = real(x);
+end
+
+x2=x(:);
+x2=[x2.'; zeros(1,N)];
+x2=x2(:);
+xf=fft(x2);
+if rem(N,2)==1      %N = odd
+	N1=fix(N/2+1); N2=2*N-fix(N/2)+1;
+	xint=2*real(ifft([xf(1:N1); zeros(N,1)  ;xf(N2:2*N)].'));
+else
+	xint=2*real(ifft([xf(1:N/2); zeros(N,1)  ;xf(2*N-N/2+1:2*N)].'));
+end
+if ( im == 1)
+ x2=imx(:);
+ x2=[x2.'; zeros(1,N)];
+ x2=x2(:);
+ xf=fft(x2);
+ if rem(N,2)==1      %N = odd
+	N1=fix(N/2+1); N2=2*N-fix(N/2)+1;
+	xmint=2*real(ifft([xf(1:N1); zeros(N,1)  ;xf(N2:2*N)].'));
+ else
+	xmint=2*real(ifft([xf(1:N/2); zeros(N,1)  ;xf(2*N-N/2+1:2*N)].'));
+ end
+ xint = xint + 1j*xmint;
+end
+
+xint = xint(:);
+
+end