From de9272b5196c98c0d7254f9e80886c63d4d21712 Mon Sep 17 00:00:00 2001
From: Rutherther <rutherther@proton.me>
Date: Sat, 30 Dec 2023 22:31:33 +0100
Subject: [PATCH] tests: add mcu_slave counter tb

---
 tb/mcu_slave/counter_tb.vhd | 79 +++++++++++++++++++++++++++++++++++++
 1 file changed, 79 insertions(+)
 create mode 100644 tb/mcu_slave/counter_tb.vhd

diff --git a/tb/mcu_slave/counter_tb.vhd b/tb/mcu_slave/counter_tb.vhd
new file mode 100644
index 0000000..60b4dfb
--- /dev/null
+++ b/tb/mcu_slave/counter_tb.vhd
@@ -0,0 +1,79 @@
+library ieee;
+use ieee.std_logic_1164.all;
+use ieee.numeric_std.all;
+
+library vunit_lib;
+context vunit_lib.vunit_context;
+
+library mcu_slave;
+
+library utils;
+
+library i2c_tb;
+use i2c_tb.tb_pkg.all;
+use i2c_tb.tb_i2c_pkg.all;
+use i2c_tb.tb_i2c_master_pkg.all;
+
+entity counter_tb is
+
+  generic (
+    runner_cfg : string);
+
+end entity counter_tb;
+
+architecture tb of counter_tb is
+  constant ADDRESS : std_logic_vector(6 downto 0) := "1110100";
+  constant CLK_PERIOD : time := 10 ns;
+  signal rst_n : std_logic := '0';
+  signal rst : std_logic;
+
+  signal scl_override, sda_override : std_logic := '0';
+
+  signal err_noack          : std_logic;
+  signal bus_busy, dev_busy : std_logic;
+begin  -- architecture tb
+  uut : entity mcu_slave.counter
+    port map (
+      clk_i       => clk,
+      rst_i       => rst,
+      rst_on      => open,
+      err_noack_o => err_noack,
+      dev_busy_o  => dev_busy,
+      bus_busy_o  => bus_busy,
+      sda_io      => sda,
+      scl_io      => scl
+    );
+
+  sda <= not sda_override;
+  scl <= not scl_override;
+
+  clk <= not clk after CLK_PERIOD / 2;
+  rst_n <= '1' after 2 * CLK_PERIOD;
+  rst <= not rst_n;
+
+  main: process is
+  begin  -- process main
+    wait until rst_n = '1';
+    wait until falling_edge(clk);
+    test_runner_setup(runner, runner_cfg);
+
+    while test_suite loop
+      if run("wrapping_counting") then
+        i2c_master_start(ADDRESS, '1', scl_override, sda_override);
+
+        for i in 0 to 99 loop
+          i2c_master_receive(std_logic_vector(to_unsigned(i, 8)), scl_override, sda_override);
+        end loop;  -- i
+
+        -- starting over
+        i2c_master_receive("00000000", scl_override, sda_override);
+        i2c_master_receive("00000001", scl_override, sda_override);
+
+        i2c_master_stop(scl_override, sda_override);
+      end if;
+    end loop;
+
+    test_runner_cleanup(runner);
+  end process main;
+
+end architecture tb;
-- 
2.49.0