Initial commit for the firmware. Used the 20090306_ela version as baseline.

It is identical to the popular 20081211, with the doob addition (20090301), a
linux client, and two additional commands for LF analysis. Let me know if
you find issues here!

fpga/testbed_fpga.v

@@ -0,0 +1,50 @@
+`include "fpga.v"
+
+module testbed_fpga;
+    reg spck, mosi, ncs;
+    wire miso;
+    reg pck0i, ck_1356meg, ck_1356megb;
+    wire pwr_lo, pwr_hi, pwr_oe1, pwr_oe2, pwr_oe3, pwr_oe4;
+    reg [7:0] adc_d;
+    wire adc_clk, adc_noe;
+    reg ssp_dout;
+    wire ssp_frame, ssp_din, ssp_clk;
+
+    fpga dut(
+        spck, miso, mosi, ncs,
+        pck0i, ck_1356meg, ck_1356megb,
+        pwr_lo, pwr_hi, pwr_oe1, pwr_oe2, pwr_oe3, pwr_oe4,
+        adc_d, adc_clk, adc_noe,
+        ssp_frame, ssp_din, ssp_dout, ssp_clk
+    );
+
+	integer i;
+
+	initial begin
+
+		// init inputs
+		#5 ncs=1;
+		#5 spck = 1;
+		#5 mosi = 1;
+
+		#50 ncs=0;
+		for (i = 0 ;  i < 8 ;  i = i + 1) begin
+			#5 mosi = $random;
+			#5 spck = 0;
+			#5 spck = 1;
+		end
+		#5 ncs=1;
+
+		#50 ncs=0;
+		for (i = 0 ;  i < 8 ;  i = i + 1) begin
+			#5 mosi = $random;
+			#5 spck = 0;
+			#5 spck = 1;
+		end
+		#5 ncs=1;
+
+		#50 mosi=1;
+		$finish;
+	end
+	
+endmodule // main