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//
// Copyright 2014 Ettus Research LLC
// Copyright 2018 Ettus Research, a National Instruments Company
//
// SPDX-License-Identifier: LGPL-3.0-or-later
//
module peak_finder
#(parameter SCALAR=131072)
(input clk, input reset, input clear,
input [31:0] i0_tdata, input i0_tlast, input i0_tvalid, output i0_tready, // power measurment
input [31:0] i1_tdata, input i1_tlast, input i1_tvalid, output i1_tready, // cross power mag/phase
output [31:0] o_tdata, output o_tlast, output o_tvalid, input o_tready);
wire [15:0] i_phase_tdata = i1_tdata[31:16];
wire [15:0] i_mag_tdata = i1_tdata[15:0];
// moved contents of threshold_scaled functionality here
wire signed [31:0] scaled_input = (i_mag_tdata-1)*SCALAR;
wire signed [31:0] difference = scaled_input - i0_tdata;
wire thresh_met = difference > 0;
// internal registers
reg [63:0] counter;
reg [7:0] debounce_counter;
reg [15:0] max_val;
reg [15:0] max_phase;
reg [63:0] max_idx;
// output registers
reg found_burst;
reg [15:0] burst_offset;
reg [15:0] burst_phase;
wire do_op;
// search for peaks durring (thresh_met = 1) periods
// debounce the thresh_met line
// send a notification and burst time/frequency downstream
always @(posedge (clk))
if(reset | clear)
begin
counter <= 0;
debounce_counter <= 0;
max_val <= 0;
max_phase <= 0;
max_idx <= 0;
found_burst <= 0;
burst_offset <= 0;
burst_phase <= 0;
end
else
if(do_op)
begin
counter <= counter + 1;
if(thresh_met | (debounce_counter > 0))
begin
if(thresh_met)
debounce_counter <= 5;
else
debounce_counter <= debounce_counter - 1;
if(i_mag_tdata > max_val)
begin
max_val <= i_mag_tdata;
max_phase <= i_phase_tdata;
max_idx <= counter;
end
end
else
// we have concluded on a peak if max_idx > 0
if(max_idx > 0)
begin
found_burst <= 1;
burst_offset <= (counter - max_idx);
burst_phase <= max_phase;
max_val <= 0;
max_idx <= 0;
end
else
begin
found_burst <= 0;
burst_offset <= 0;
burst_phase <= 0;
end
end
assign o_tdata = {burst_phase, burst_offset};
assign o_tlast = found_burst;
assign do_op = (i0_tvalid & i1_tvalid & o_tready);
assign o_tvalid = i0_tvalid & i1_tvalid;
assign i0_tready = do_op;
assign i1_tready = do_op;
endmodule // peak_finder
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