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現実世界を動かす技術をシェアしよう！～身近なものづくりから最先端テクノロジーまで大募集！～
@ohisama@github

windowsでiverilog その232

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概要　

windowsでiverilogやってみた。
verilogでECU書いてみた。

写真

image.png

ECUの仕様

クランクセンサーのみ、36歯1欠
360度で動く
出力は、インジェクターとイグニッションコイル

サンプルコード

module ecu (input wire clk, input wire rst_n, input wire crank_pulse, output reg efi_trigger, output reg ign_trigger);
	reg [8:0] crank_angle_360;
	reg crank_d1;
	wire crank_edge;
	reg [19:0] t_count;
	reg [19:0] t_last_tooth;
	reg sync_ready;
	wire missing_tooth_detected;
	assign crank_edge = (crank_pulse == 1'b1) && (crank_d1 == 1'b0);
	assign missing_tooth_detected = crank_edge && sync_ready && (t_count > (t_last_tooth + (t_last_tooth >> 1)));
	initial
	begin
		$monitor("Angle: %d  efi: %d ign: %d", crank_angle_360, efi_trigger, ign_trigger);
	end
	always @(posedge clk or negedge rst_n)
	begin
		if (!rst_n)
		begin
			crank_d1 <= 1'b0;
			crank_angle_360 <= 9'd0;
			t_count <= 20'd0;
			t_last_tooth <= 20'd0;
			sync_ready <= 1'b0;
		end
		else
		begin
			crank_d1 <= crank_pulse;
			if (crank_edge)
			begin
				t_count <= 20'd0;
				if (missing_tooth_detected)
				begin
					crank_angle_360 <= 9'd0;
				end
				else
				begin
					t_last_tooth <= t_count;
					if (t_count > 20'd10)
					begin
						sync_ready <= 1'b1;
					end
					if (crank_angle_360 >= 9'd350)
					begin
						crank_angle_360 <= 9'd0;
					end
					else
					begin
						crank_angle_360 <= crank_angle_360 + 9'd10;
					end
				end
			end
			else
			begin
				if (t_count < 20'hFFFFF)
				begin
					t_count <= t_count + 20'd1;
				end
			end
		end
	end
	always @(posedge clk or negedge rst_n)
	begin
		if (!rst_n)
		begin
			efi_trigger <= 1'b0;
			ign_trigger <= 1'b0;
		end
		else
		begin
			if (crank_angle_360 == 9'd30)
			begin
				efi_trigger <= 1'b1;
			end
			else if (crank_angle_360 == 9'd120)
			begin
				efi_trigger <= 1'b0;
			end
			if (crank_angle_360 == 9'd340)
			begin
				ign_trigger <= 1'b1;
			end
			else if (crank_angle_360 == 9'd0)
			begin
				ign_trigger <= 1'b0;
			end
		end
	end
endmodule

テストベンチ


`timescale 1ns / 1ps
module test;
	localparam TOOTH_PERIOD = 200000;
	integer i;
	reg clk;
	reg rst_n;
	reg crank_pulse;
	wire efi_trigger;
	wire ign_trigger;
	ecu uut (.clk(clk), .rst_n(rst_n), .crank_pulse(crank_pulse), .efi_trigger(efi_trigger), .ign_trigger(ign_trigger));
	initial
	begin
		$dumpfile("test.vcd");
		$dumpvars(0, test);
		clk = 0;
		rst_n = 1;
		crank_pulse = 0;
		#100;
		rst_n = 0;
		#100;
		rst_n = 1;
		$display("--- シミュレーション開始 (36-1歯クランク信号入力) ---");
		repeat (3)
		begin
			for (i = 1; i <= 35; i = i + 1)
			begin
				crank_pulse = 1;
				#(TOOTH_PERIOD / 2);
				crank_pulse = 0;
				#(TOOTH_PERIOD / 2);
			end
			$display("[TB] 欠歯エリア通過");
			crank_pulse = 0;
			#TOOTH_PERIOD;
		end
		$display("--- シミュレーション終了 ---");
		$finish;
	end
	always
	begin
		#10
			clk = ~clk;
	end
endmodule

実行結果

>vvp a.out

VCD info: dumpfile test.vcd opened for output.
Angle:   x  efi: x ign: x
Angle:   0  efi: 0 ign: 0
--- シミュレーション開始 (36-1歯クランク信号入力) ---
Angle:  10  efi: 0 ign: 0
Angle:  20  efi: 0 ign: 0
Angle:  30  efi: 0 ign: 0
Angle:  30  efi: 1 ign: 0
Angle:  40  efi: 1 ign: 0
Angle:  50  efi: 1 ign: 0
Angle:  60  efi: 1 ign: 0
Angle:  70  efi: 1 ign: 0
Angle:  80  efi: 1 ign: 0
Angle:  90  efi: 1 ign: 0
Angle: 100  efi: 1 ign: 0
Angle: 110  efi: 1 ign: 0
Angle: 120  efi: 1 ign: 0
Angle: 120  efi: 0 ign: 0
Angle: 130  efi: 0 ign: 0
Angle: 140  efi: 0 ign: 0
Angle: 150  efi: 0 ign: 0
Angle: 160  efi: 0 ign: 0
Angle: 170  efi: 0 ign: 0
Angle: 180  efi: 0 ign: 0
Angle: 190  efi: 0 ign: 0
Angle: 200  efi: 0 ign: 0
Angle: 210  efi: 0 ign: 0
Angle: 220  efi: 0 ign: 0
Angle: 230  efi: 0 ign: 0
Angle: 240  efi: 0 ign: 0
Angle: 250  efi: 0 ign: 0
Angle: 260  efi: 0 ign: 0
Angle: 270  efi: 0 ign: 0
Angle: 280  efi: 0 ign: 0
Angle: 290  efi: 0 ign: 0
Angle: 300  efi: 0 ign: 0
Angle: 310  efi: 0 ign: 0
Angle: 320  efi: 0 ign: 0
Angle: 330  efi: 0 ign: 0
Angle: 340  efi: 0 ign: 0
Angle: 340  efi: 0 ign: 1
Angle: 350  efi: 0 ign: 1
[TB] 欠歯エリア通過
Angle:   0  efi: 0 ign: 1
Angle:   0  efi: 0 ign: 0
Angle:  10  efi: 0 ign: 0
Angle:  20  efi: 0 ign: 0
Angle:  30  efi: 0 ign: 0
Angle:  30  efi: 1 ign: 0
Angle:  40  efi: 1 ign: 0
Angle:  50  efi: 1 ign: 0
Angle:  60  efi: 1 ign: 0
Angle:  70  efi: 1 ign: 0
Angle:  80  efi: 1 ign: 0
Angle:  90  efi: 1 ign: 0
Angle: 100  efi: 1 ign: 0
Angle: 110  efi: 1 ign: 0
Angle: 120  efi: 1 ign: 0
Angle: 120  efi: 0 ign: 0
Angle: 130  efi: 0 ign: 0
Angle: 140  efi: 0 ign: 0
Angle: 150  efi: 0 ign: 0
Angle: 160  efi: 0 ign: 0
Angle: 170  efi: 0 ign: 0
Angle: 180  efi: 0 ign: 0
Angle: 190  efi: 0 ign: 0
Angle: 200  efi: 0 ign: 0
Angle: 210  efi: 0 ign: 0
Angle: 220  efi: 0 ign: 0
Angle: 230  efi: 0 ign: 0
Angle: 240  efi: 0 ign: 0
Angle: 250  efi: 0 ign: 0
Angle: 260  efi: 0 ign: 0
Angle: 270  efi: 0 ign: 0
Angle: 280  efi: 0 ign: 0
Angle: 290  efi: 0 ign: 0
Angle: 300  efi: 0 ign: 0
Angle: 310  efi: 0 ign: 0
Angle: 320  efi: 0 ign: 0
Angle: 330  efi: 0 ign: 0
Angle: 340  efi: 0 ign: 0
Angle: 340  efi: 0 ign: 1
[TB] 欠歯エリア通過
Angle:   0  efi: 0 ign: 1
Angle:   0  efi: 0 ign: 0
Angle:  10  efi: 0 ign: 0
Angle:  20  efi: 0 ign: 0
Angle:  30  efi: 0 ign: 0
Angle:  30  efi: 1 ign: 0
Angle:  40  efi: 1 ign: 0
Angle:  50  efi: 1 ign: 0
Angle:  60  efi: 1 ign: 0
Angle:  70  efi: 1 ign: 0
Angle:  80  efi: 1 ign: 0
Angle:  90  efi: 1 ign: 0
Angle: 100  efi: 1 ign: 0
Angle: 110  efi: 1 ign: 0
Angle: 120  efi: 1 ign: 0
Angle: 120  efi: 0 ign: 0
Angle: 130  efi: 0 ign: 0
Angle: 140  efi: 0 ign: 0
Angle: 150  efi: 0 ign: 0
Angle: 160  efi: 0 ign: 0
Angle: 170  efi: 0 ign: 0
Angle: 180  efi: 0 ign: 0
Angle: 190  efi: 0 ign: 0
Angle: 200  efi: 0 ign: 0
Angle: 210  efi: 0 ign: 0
Angle: 220  efi: 0 ign: 0
Angle: 230  efi: 0 ign: 0
Angle: 240  efi: 0 ign: 0
Angle: 250  efi: 0 ign: 0
Angle: 260  efi: 0 ign: 0
Angle: 270  efi: 0 ign: 0
Angle: 280  efi: 0 ign: 0
Angle: 290  efi: 0 ign: 0
Angle: 300  efi: 0 ign: 0
Angle: 310  efi: 0 ign: 0
Angle: 320  efi: 0 ign: 0
Angle: 330  efi: 0 ign: 0
Angle: 340  efi: 0 ign: 0
Angle: 340  efi: 0 ign: 1
[TB] 欠歯エリア通過
--- シミュレーション終了 ---
ecu9.v:133: $finish called at 21600200000 (1ps)

以上。

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