From d8ac5d6421e9156d3c9ebde905c838d7e277e181 Mon Sep 17 00:00:00 2001
From: Tristan Gingold <tgingold@free.fr>
Date: Fri, 14 Apr 2023 21:16:32 +0200
Subject: testsuite/synth: add a test for ghdl/ghdl-yosys-plugin#183

---
 testsuite/synth/synth183/test.vhdl    | 45 +++++++++++++++++++++++++++++++++++
 testsuite/synth/synth183/testsuite.sh | 11 +++++++++
 2 files changed, 56 insertions(+)
 create mode 100644 testsuite/synth/synth183/test.vhdl
 create mode 100755 testsuite/synth/synth183/testsuite.sh

(limited to 'testsuite')

diff --git a/testsuite/synth/synth183/test.vhdl b/testsuite/synth/synth183/test.vhdl
new file mode 100644
index 000000000..84fc93639
--- /dev/null
+++ b/testsuite/synth/synth183/test.vhdl
@@ -0,0 +1,45 @@
+library ieee;
+    use ieee.std_logic_1164.all;
+
+entity test is
+    generic (
+        BAUD_MULT   : positive := 16
+    );
+    port (
+        clk, rst    : in std_logic;
+
+        brk         : out std_logic;
+        rx          : in std_logic
+    );
+end test;
+
+architecture behavioral of test is
+
+    signal rx_buf   : std_logic := '1';
+    signal break    : std_logic := '0';
+
+begin
+
+    BREAK_DETECTOR: process (clk, rst) is
+        constant BREAK_CNT : positive := BAUD_MULT * 11;
+        variable count : natural range 0 to BREAK_CNT + 1 := 0;
+    begin
+        if (rising_edge(clk)) then
+            rx_buf      <= rx;
+            -- Add to counter if '0', but halt count when break detected
+            count := (count + 1) when not(rx_buf or break);
+            -- Reset counter if '1'
+            count := 0 when rx_buf; 
+
+            break <= '0' when (count < BREAK_CNT) else '1';
+
+            if (rst = '1') then
+                count := 0;
+                break <= '0';
+            end if;
+        end if;
+    end process;
+
+    brk <= break;
+
+end behavioral;
\ No newline at end of file
diff --git a/testsuite/synth/synth183/testsuite.sh b/testsuite/synth/synth183/testsuite.sh
new file mode 100755
index 000000000..eb1ca0714
--- /dev/null
+++ b/testsuite/synth/synth183/testsuite.sh
@@ -0,0 +1,11 @@
+#! /bin/sh
+
+. ../../testenv.sh
+
+GHDL_STD_FLAGS=--std=08
+
+synth_analyze test
+
+clean
+
+echo "Test successful"
-- 
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