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// Copyright 2014, Ettus Research
// Copyright 2018 Ettus Research, a National Instruments Company
//
// SPDX-License-Identifier: LGPL-3.0-or-later
// Dummy data source. Turn it on by setting a packet length in its setting reg, turn it off by setting 0.
// Will generate as fast as it can.
module file_source #(
parameter SR_ENABLE = 0,
parameter SR_PKT_LENGTH = 1,
parameter SR_RATE = 2,
parameter SR_SEND_TIME = 3,
parameter SR_SWAP_SAMPLES = 4, // 0: Do nothing, 1: 8-bit swap, 2: 16-bit, 3: 32-bit
parameter SR_ENDIANNESS = 5, // 0: Do nothing, 1: 16-bit boundary, 2: 32-bit
// Default (after reset) values for above settings register set to sc16
parameter DEFAULT_SWAP_SAMPLES = 2,
parameter DEFAULT_ENDIANNESS = 2,
parameter FILE_LENGTH = 65536, // Bytes
parameter FILENAME="")
(
input clk, input reset, input [31:0] sid,
input set_stb, input [7:0] set_addr, input [31:0] set_data,
output [63:0] o_tdata, output o_tlast, output o_tvalid, input o_tready);
reg [63:0] mem[0:FILE_LENGTH/8-1];
integer file, file_length;
reg [$clog2(FILE_LENGTH/8)-1:0] index;
integer i;
initial begin
if (FILENAME != "") begin
$readmemh(FILENAME, mem);
end
end
reg [11:0] seqnum;
wire [15:0] rate;
reg [1:0] state;
reg [15:0] line_number;
wire [63:0] int_tdata;
wire int_tlast, int_tvalid, int_tready;
wire enable;
wire [15:0] len;
reg [15:0] count;
wire send_time;
wire [1:0] swap_samples;
wire [1:0] endianness;
setting_reg #(.my_addr(SR_ENABLE), .width(1)) sr_sid (
.clk(clk), .rst(reset), .strobe(set_stb), .addr(set_addr), .in(set_data),
.out(enable), .changed());
setting_reg #(.my_addr(SR_PKT_LENGTH), .width(16)) sr_len (
.clk(clk), .rst(reset), .strobe(set_stb), .addr(set_addr), .in(set_data),
.out(len), .changed());
setting_reg #(.my_addr(SR_RATE), .width(16)) sr_rate (
.clk(clk), .rst(reset), .strobe(set_stb), .addr(set_addr), .in(set_data),
.out(rate), .changed());
setting_reg #(.my_addr(SR_SEND_TIME), .width(1)) sr_send_time (
.clk(clk), .rst(reset), .strobe(set_stb), .addr(set_addr), .in(set_data),
.out(send_time), .changed());
setting_reg #(
.my_addr(SR_SWAP_SAMPLES), .width(2), .at_reset(DEFAULT_SWAP_SAMPLES))
sr_swap_samples (
.clk(clk), .rst(reset), .strobe(set_stb), .addr(set_addr), .in(set_data),
.out(swap_samples), .changed());
setting_reg #(
.my_addr(SR_ENDIANNESS), .width(2), .at_reset(DEFAULT_ENDIANNESS))
sr_endianness (
.clk(clk), .rst(reset), .strobe(set_stb), .addr(set_addr), .in(set_data),
.out(endianness), .changed());
localparam IDLE = 2'd0;
localparam HEAD = 2'd1;
localparam TIME = 2'd2;
localparam DATA = 2'd3;
always @(posedge clk) begin
if(reset) begin
state <= IDLE;
count <= 0;
index <= 0;
seqnum <= 0;
end else begin
case (state)
IDLE : begin
if (len != 0) begin
state <= HEAD;
end
end
HEAD : begin
if (int_tvalid & int_tready) begin
count <= 1;
seqnum <= seqnum + 1;
if (send_time) begin
state <= TIME;
end else begin
state <= DATA;
end
end
end
TIME : begin
if (int_tvalid & int_tready) begin
state <= DATA;
end
end
DATA : begin
if (int_tvalid & int_tready) begin
index <= index + 1;
if (count == len) begin
state <= IDLE;
count <= 0;
end else begin
count <= count + 1;
end
end
end
default : state <= IDLE;
endcase
end
end
reg [63:0] time_cnt;
always @(posedge clk) begin
if (reset) begin
time_cnt <= 'd0;
end else begin
time_cnt <= time_cnt + 1;
end
end
wire [15:0] pkt_len = { len[12:0], 3'b000 } + 16'd8 + (send_time ? 16'd8 : 16'd0);
wire [63:0] data_int = mem[index];
// Swap endianness
wire [63:0] data = (endianness == 2'd0) ? data_int :
(endianness == 2'd1) ? {data_int[47:32], data_int[63:48], data_int[15: 0], data_int[31:16]} :
(endianness == 2'd2) ? {data_int[39:32], data_int[47:40], data_int[55:48], data_int[63:56],
data_int[ 7: 0], data_int[15: 8], data_int[23:16], data_int[31:24]} :
64'd0;
// Swap samples
wire [63:0] data_out = (swap_samples == 2'd0) ? data :
(swap_samples == 2'd1) ? {data[55:48], data[63:56], data[39:32], data[47:40],
data[23:16], data[31:24], data[ 7: 0], data[15: 8]} :
(swap_samples == 2'd2) ? {data[47:32], data[63:48], data[15: 0], data[31:16]} :
(swap_samples == 2'd3) ? {data[31: 0], data[63:32]} :
64'd0;
assign int_tdata = (state == HEAD) ? { 2'b00, send_time, 1'b0, seqnum, pkt_len, sid } :
(state == TIME) ? time_cnt : data_out;
assign int_tlast = (count == len);
reg [15:0] line_timer;
always @(posedge clk) begin
if (reset) begin
line_timer <= 0;
end else begin
if (line_timer == 0 || line_timer == 1) begin
line_timer <= rate;
end else begin
line_timer <= line_timer - 1;
end
end
end
assign int_tvalid = enable & ((state==HEAD)|(state==DATA)|(state==TIME)) & (line_timer==0 || line_timer==1);
axi_packet_gate #(.WIDTH(64)) gate (
.clk(clk), .reset(reset), .clear(1'b0),
.i_tdata(int_tdata), .i_tlast(int_tlast), .i_terror(1'b0), .i_tvalid(int_tvalid), .i_tready(int_tready),
.o_tdata(o_tdata), .o_tlast(o_tlast), .o_tvalid(o_tvalid), .o_tready(o_tready));
endmodule // file_source
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