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// -*- 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
//
module radar_tx(clk_i,rst_i,ena_i,strobe_i,
ampl_i,fstart_i,fincr_i,
tx_i_o,tx_q_o);
// System control
input clk_i;
input rst_i;
input ena_i;
input strobe_i;
// Configuration
input [15:0] ampl_i;
input [31:0] fstart_i;
input [31:0] fincr_i;
// Chirp output
output [13:0] tx_i_o;
output [13:0] tx_q_o;
wire [15:0] cordic_i, cordic_q;
// Chirp generator
reg [31:0] freq;
always @(posedge clk_i)
if (rst_i | ~ena_i)
freq <= fstart_i;
else
if (strobe_i)
freq <= freq + fincr_i;
cordic_nco nco(.clk_i(clk_i),.rst_i(rst_i),.ena_i(ena_i),.strobe_i(strobe_i),
.ampl_i(ampl_i),.freq_i(freq),.phs_i(0),
.data_i_o(cordic_i),.data_q_o(cordic_q));
assign tx_i_o = cordic_i[13:0];
assign tx_q_o = cordic_q[13:0];
endmodule // radar_tx
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