Diff: trace_helper.cpp

Revision:

0:895bbd4e6398

diff -r 000000000000 -r 895bbd4e6398 trace_helper.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/trace_helper.cpp	Tue Sep 01 21:06:51 2020 +0800
@@ -0,0 +1,72 @@
+/**
+ * Copyright (c) 2017, Arm Limited and affiliates.
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * If we have tracing library available, we can see traces from within the
+ * stack. The library could be made unavailable by removing FEATURE_COMMON_PAL
+ * from the mbed_app.json to save RAM.
+ */
+
+#include "mbed_trace.h"
+
+#ifdef FEA_TRACE_SUPPORT
+#include "platform/PlatformMutex.h"
+
+/**
+ * Local mutex object for synchronization
+ */
+static PlatformMutex mutex;
+
+static void serial_lock();
+static void serial_unlock();
+
+/**
+ * Sets up trace for the application
+ * Wouldn't do anything if the FEATURE_COMMON_PAL is not added
+ * or if the trace is disabled using mbed_app.json
+ */
+void setup_trace()
+{
+    // setting up Mbed trace.
+    mbed_trace_mutex_wait_function_set(serial_lock);
+    mbed_trace_mutex_release_function_set(serial_unlock);
+    mbed_trace_init();
+}
+
+/**
+ * Lock provided for serial printing used by trace library
+ */
+static void serial_lock()
+{
+    mutex.lock();
+}
+
+/**
+ * Releasing lock provided for serial printing used by trace library
+ */
+static void serial_unlock()
+{
+    mutex.unlock();
+}
+#else
+void setup_trace()
+{
+
+}
+#endif
+
+