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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
//
`include "../lib/radar_config.vh"
module radar_control(clk_i,saddr_i,sdata_i,s_strobe_i,reset_o,
tx_side_o,dbg_o,tx_strobe_o,tx_ctrl_o,rx_ctrl_o,
ampl_o,fstart_o,fincr_o,pulse_num_o,io_tx_ena_o);
// System interface
input clk_i; // Master clock @ 64 MHz
input [6:0] saddr_i; // Configuration bus address
input [31:0] sdata_i; // Configuration bus data
input s_strobe_i; // Configuration bus write
// Control and configuration outputs
output reset_o;
output tx_side_o;
output dbg_o;
output tx_strobe_o;
output tx_ctrl_o;
output rx_ctrl_o;
output [15:0] ampl_o;
output [31:0] fstart_o;
output [31:0] fincr_o;
output [15:0] pulse_num_o;
output io_tx_ena_o;
// Internal configuration
wire lp_ena;
wire md_ena;
wire dr_ena;
wire [1:0] chirps;
wire [15:0] t_on;
wire [15:0] t_sw;
wire [15:0] t_look;
wire [31:0] t_idle;
wire [31:0] atrdel;
// Configuration from host
wire [31:0] mode;
setting_reg #(`FR_RADAR_MODE) sr_mode(.clock(clk_i),.reset(1'b0),.strobe(s_strobe_i),.addr(saddr_i),.in(sdata_i),
.out(mode));
assign reset_o = mode[0];
assign tx_side_o = mode[1];
assign lp_ena = mode[2];
assign md_ena = mode[3];
assign dr_ena = mode[4];
assign chirps = mode[6:5];
assign dbg_o = mode[7];
setting_reg #(`FR_RADAR_TON) sr_ton(.clock(clk_i),.reset(1'b0),.strobe(s_strobe_i),.addr(saddr_i),.in(sdata_i),
.out(t_on));
setting_reg #(`FR_RADAR_TSW) sr_tsw(.clock(clk_i),.reset(1'b0),.strobe(s_strobe_i),.addr(saddr_i),.in(sdata_i),
.out(t_sw));
setting_reg #(`FR_RADAR_TLOOK) sr_tlook(.clock(clk_i),.reset(1'b0),.strobe(s_strobe_i),.addr(saddr_i),.in(sdata_i),
.out(t_look));
setting_reg #(`FR_RADAR_TIDLE) sr_tidle(.clock(clk_i),.reset(1'b0),.strobe(s_strobe_i),.addr(saddr_i),.in(sdata_i),
.out(t_idle));
setting_reg #(`FR_RADAR_AMPL) sr_ampl(.clock(clk_i),.reset(1'b0),.strobe(s_strobe_i),.addr(saddr_i),.in(sdata_i),
.out(ampl_o));
setting_reg #(`FR_RADAR_FSTART) sr_fstart(.clock(clk_i),.reset(1'b0),.strobe(s_strobe_i),.addr(saddr_i),.in(sdata_i),
.out(fstart_o));
setting_reg #(`FR_RADAR_FINCR) sr_fincr(.clock(clk_i),.reset(1'b0),.strobe(s_strobe_i),.addr(saddr_i),.in(sdata_i),
.out(fincr_o));
setting_reg #(`FR_RADAR_ATRDEL) sr_atrdel(.clock(clk_i),.reset(1'b0),.strobe(s_strobe_i),.addr(saddr_i),.in(sdata_i),
.out(atrdel));
// Pulse state machine
`define ST_ON 4'b0001
`define ST_SW 4'b0010
`define ST_LOOK 4'b0100
`define ST_IDLE 4'b1000
reg [3:0] state;
reg [31:0] count;
reg [15:0] pulse_num_o;
always @(posedge clk_i)
if (reset_o)
begin
state <= `ST_ON;
count <= 32'b0;
pulse_num_o <= 16'b0;
end
else
case (state)
`ST_ON:
if (count == {16'b0,t_on})
begin
state <= `ST_SW;
count <= 32'b0;
pulse_num_o <= pulse_num_o + 16'b1;
end
else
count <= count + 32'b1;
`ST_SW:
if (count == {16'b0,t_sw})
begin
state <= `ST_LOOK;
count <= 32'b0;
end
else
count <= count + 32'b1;
`ST_LOOK:
if (count == {16'b0,t_look})
begin
state <= `ST_IDLE;
count <= 32'b0;
end
else
count <= count + 32'b1;
`ST_IDLE:
if (count == t_idle)
begin
state <= `ST_ON;
count <= 32'b0;
end
else
count <= count + 32'b1;
default: // Invalid state, reset state machine
begin
state <= `ST_ON;
count <= 32'b0;
end
endcase
assign tx_strobe_o = count[0]; // Drive DAC inputs at 32 MHz
assign tx_ctrl_o = (state == `ST_ON);
assign rx_ctrl_o = (state == `ST_LOOK);
// Create delayed version of tx_ctrl_o to drive mixers and TX/RX switch
atr_delay atr_delay(.clk_i(clk_i),.rst_i(reset_o),.ena_i(1'b1),.tx_empty_i(!tx_ctrl_o),
.tx_delay_i(atrdel[27:16]),.rx_delay_i(atrdel[11:0]),
.atr_tx_o(io_tx_ena_o));
endmodule // radar_control
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