From d7a11e0e8584e088921c9486c4f064eaf5e004f7 Mon Sep 17 00:00:00 2001
From: Brian Woods
Date: Fri, 24 Feb 2023 12:17:46 -0500
Subject: counter: simple simulation of a counter

---
 counter/counter.vhd | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100644 counter/counter.vhd

(limited to 'counter/counter.vhd')

diff --git a/counter/counter.vhd b/counter/counter.vhd
new file mode 100644
index 0000000..d4a941b
--- /dev/null
+++ b/counter/counter.vhd
@@ -0,0 +1,36 @@
+-- SPDX-FileCopyrightText: 2023 Brian Woods
+-- SPDX-License-Identifier: GPL-2.0-or-later
+
+library IEEE;
+use IEEE.std_logic_1164.all;
+use IEEE.numeric_std.all;
+
+entity counter is
+	port(
+		set: in std_logic;
+		set_val: in unsigned(7 downto 0);
+		cnt: out unsigned(7 downto 0);
+		en: in  std_logic;
+		clr: in std_logic;
+		clk: in std_logic
+	);
+end entity;
+
+architecture func of counter is
+	signal counter: unsigned(7 downto 0);
+begin
+	cnt <= counter;
+
+	process (clk, clr)
+	begin
+		if (clr='1') then
+			counter <= "00000000";
+		elsif  (clk='1' and clk'event) then
+			if (set='1') then
+				counter <= set_val;
+			elsif (en='1') then
+				counter <= counter + 1;
+			end if;
+		end if;
+	end process;
+end func;
-- 
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