From 173622e9e82b7c2b1c6f8146056661b2a6577735 Mon Sep 17 00:00:00 2001
From: Johannes Stoelp <johannes.stoelp@gmail.com>
Date: Wed, 26 Jul 2023 00:05:14 +0200
Subject: add some initial playground examples + scripts to build

---
 sc_export.cc | 76 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 76 insertions(+)
 create mode 100644 sc_export.cc

(limited to 'sc_export.cc')

diff --git a/sc_export.cc b/sc_export.cc
new file mode 100644
index 0000000..7acca58
--- /dev/null
+++ b/sc_export.cc
@@ -0,0 +1,76 @@
+#include <systemc>
+#include "utils.h"
+
+using sc_core::sc_export;
+using sc_core::sc_in;
+using sc_core::sc_module;
+using sc_core::sc_module_name;
+using sc_core::SC_NS;
+using sc_core::sc_signal;
+using sc_core::sc_signal_inout_if;
+
+// -- CLOCK_GEN ----------------------------------------------------------------
+
+struct clock_gen : public sc_module {
+  SC_HAS_PROCESS(clock_gen);
+
+  explicit clock_gen(sc_module_name nm, unsigned period_ns = 20)
+      : sc_module(nm), m_half_period(period_ns / 2) {
+    assert(period_ns == m_half_period * 2);
+
+    // Bind sc_signal (clk) against export.
+    p_clk(m_clk);
+
+    SC_METHOD(tick);
+  }
+
+  // Export to expose sc_signal (clk) outside this module.
+  sc_export<sc_signal_inout_if<bool>> p_clk;
+
+ private:
+  // Implementation of sc_signal_inout_if.
+  sc_signal<bool> m_clk;
+
+  const unsigned m_half_period;
+
+  void tick() {
+    m_clk.write(!m_clk.read());
+    next_trigger(m_half_period, SC_NS);
+  }
+};
+
+// -- TICKTOCK -----------------------------------------------------------------
+
+struct ticktock : public sc_module {
+  SC_HAS_PROCESS(ticktock);
+
+  explicit ticktock(sc_module_name nm) : sc_module(nm) {
+    SC_METHOD(handle_clk);
+    sensitive << p_clk;
+    dont_initialize();
+  }
+
+  // In port, where sc_in is just a sc_port<sc_signal_in_if<bool>>.
+  sc_in<bool> p_clk;
+
+ private:
+  void handle_clk() {
+    if (p_clk.read()) {
+      LOGM("TICK");
+    } else {
+      LOGM("TOCK");
+    }
+  }
+};
+
+// -- SC_MAIN ------------------------------------------------------------------
+
+extern "C" int sc_main(int, char*[]) {
+  clock_gen clk("clk");
+  ticktock tiktok{"listen"};
+
+  tiktok.p_clk(clk.p_clk);
+
+  sc_start(200, SC_NS);
+  return 0;
+}
-- 
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