Merged r5732:5941 from jcorgan/sar into trunk. Adds start of gr-radar-mono component...

[debian/gnuradio] / gr-radar-mono / src / fpga / lib / radar_rx.v

diff --git a/gr-radar-mono/src/fpga/lib/radar_rx.v b/gr-radar-mono/src/fpga/lib/radar_rx.v
new file mode 100644 (file)
index 0000000..a6c7409
--- /dev/null
+++ b/gr-radar-mono/src/fpga/lib/radar_rx.v
@@ -0,0 +1,64 @@
+// -*- verilog -*-
+//
+//  USRP - Universal Software Radio Peripheral
+//
+//  Copyright (C) 2007 Corgan Enterprises LLC
+//
+//  This program is free software; you can redistribute it and/or modify
+//  it under the terms of the GNU General Public License as published by
+//  the Free Software Foundation; either version 2 of the License, or
+//  (at your option) any later version.
+//
+//  This program is distributed in the hope that it will be useful,
+//  but WITHOUT ANY WARRANTY; without even the implied warranty of
+//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//  GNU General Public License for more details.
+//
+//  You should have received a copy of the GNU General Public License
+//  along with this program; if not, write to the Free Software
+//  Foundation, Inc., 51 Franklin Street, Boston, MA  02110-1301  USA
+//
+
+`include "../../../../usrp/firmware/include/fpga_regs_common.v"
+`include "../../../../usrp/firmware/include/fpga_regs_standard.v"
+
+module radar_rx(clk_i,rst_i,ena_i,strobe_i,saddr_i,sdata_i,s_strobe_i,rx_in_i_i,rx_in_q_i,
+               rx_i_o,rx_q_o,rx_strobe_o);
+   
+   input clk_i;
+   input rst_i;
+   input ena_i;
+   input strobe_i;
+
+   input [6:0] saddr_i;
+   input [31:0] sdata_i;
+   input s_strobe_i;
+
+   input [15:0] rx_in_i_i;
+   input [15:0] rx_in_q_i;
+
+   output [15:0] rx_i_o;
+   output [15:0] rx_q_o;
+   output rx_strobe_o;
+
+   // Just count up for debugging
+   reg [31:0] counter;
+
+   always @(posedge clk_i)
+     begin
+       if (rst_i | ~ena_i)
+         counter <= 32'b0;
+       else if (strobe_i & rx_strobe_o)
+         counter <= counter + 32'b1;
+     end
+
+   assign rx_i_o = ena_i ? counter[31:16] : 16'b0;
+   assign rx_q_o = ena_i ? counter[15:0] : 16'b0;
+   
+   // Temporarily we duplicate what master_control.v did to generate decim_strobe
+   // so we can do receive debugging. Later we'll drive rx_strobe_o in bursts to
+   // load receiver data into the rx fifo.
+   strobe_gen rx_strobe_gen
+     ( .clock(clk_i),.reset(rst_i),.enable(ena_i),.rate(7),.strobe_in(strobe_i),.strobe(rx_strobe_o) );
+   
+endmodule // radar_rx