initial, with blinking led

system/include/diag/Trace.h

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+/*
+ * This file is part of the µOS++ distribution.
+ *   (https://github.com/micro-os-plus)
+ * Copyright (c) 2014 Liviu Ionescu.
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom
+ * the Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef DIAG_TRACE_H_
+#define DIAG_TRACE_H_
+
+// ----------------------------------------------------------------------------
+
+#include <unistd.h>
+
+// ----------------------------------------------------------------------------
+
+// The trace device is an independent output channel, intended for debug
+// purposes.
+//
+// The API is simple, and mimics the standard output calls:
+// - trace_printf()
+// - trace_puts()
+// - trace_putchar();
+//
+// The implementation is done in
+// - trace_write()
+//
+// Trace support is enabled by adding the TRACE definition.
+// By default the trace messages are forwarded to the ITM output,
+// but can be rerouted via any device or completely suppressed by
+// changing the definitions required in system/src/diag/trace_impl.c
+// (currently OS_USE_TRACE_ITM, OS_USE_TRACE_SEMIHOSTING_DEBUG/_STDOUT).
+//
+// When TRACE is not defined, all functions are inlined to empty bodies.
+// This has the advantage that the trace call do not need to be conditionally
+// compiled with #ifdef TRACE/#endif
+
+
+#if defined(TRACE)
+
+#if defined(__cplusplus)
+extern "C"
+{
+#endif
+
+  void
+  trace_initialize(void);
+
+  // Implementation dependent
+  ssize_t
+  trace_write(const char* buf, size_t nbyte);
+
+  // ----- Portable -----
+
+  int
+  trace_printf(const char* format, ...);
+
+  int
+  trace_puts(const char *s);
+
+  int
+  trace_putchar(int c);
+
+  void
+  trace_dump_args(int argc, char* argv[]);
+
+#if defined(__cplusplus)
+}
+#endif
+
+#else // !defined(TRACE)
+
+#if defined(__cplusplus)
+extern "C"
+{
+#endif
+
+  inline void
+  trace_initialize(void);
+
+  // Implementation dependent
+  inline ssize_t
+  trace_write(const char* buf, size_t nbyte);
+
+  inline int
+  trace_printf(const char* format, ...);
+
+  inline int
+  trace_puts(const char *s);
+
+  inline int
+  trace_putchar(int c);
+
+  inline void
+  trace_dump_args(int argc, char* argv[]);
+
+#if defined(__cplusplus)
+}
+#endif
+
+inline void
+__attribute__((always_inline))
+trace_initialize(void)
+{
+}
+
+// Empty definitions when trace is not defined
+inline ssize_t
+__attribute__((always_inline))
+trace_write(const char* buf __attribute__((unused)),
+    size_t nbyte __attribute__((unused)))
+{
+  return 0;
+}
+
+inline int
+__attribute__((always_inline))
+trace_printf(const char* format __attribute__((unused)), ...)
+  {
+    return 0;
+  }
+
+inline int
+__attribute__((always_inline))
+trace_puts(const char *s __attribute__((unused)))
+{
+  return 0;
+}
+
+inline int
+__attribute__((always_inline))
+trace_putchar(int c)
+{
+  return c;
+}
+
+inline void
+__attribute__((always_inline))
+trace_dump_args(int argc __attribute__((unused)),
+    char* argv[] __attribute__((unused)))
+{
+}
+
+#endif // defined(TRACE)
+
+// ----------------------------------------------------------------------------
+
+#endif // DIAG_TRACE_H_