Diff: platform/DeepSleepLock.h

Revision:

156:ff21514d8981

Child:

158:1c57384330a6

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/platform/DeepSleepLock.h	Wed Nov 08 17:18:06 2017 +0000
@@ -0,0 +1,87 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2017 ARM Limited
+ *
+ * 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.
+ */
+#ifndef MBED_DEEPSLEEPLOCK_H
+#define MBED_DEEPSLEEPLOCK_H
+
+#include <limits.h>
+#include "platform/mbed_sleep.h"
+#include "platform/mbed_critical.h"
+
+namespace mbed {
+
+
+/** RAII object for disabling, then restoring the deep sleep mode
+  * Usage:
+  * @code
+  *
+  * void f() {
+  *     // some code here
+  *     {
+  *         DeepSleepLock lock;
+  *         // Code in this block will run with the deep sleep mode locked
+  *     }
+  *     // deep sleep mode will be restored to their previous state
+  * }
+  * @endcode
+  */
+class DeepSleepLock {
+private:
+    uint16_t _lock_count;
+
+public:
+    DeepSleepLock(): _lock_count(1)
+    {
+        sleep_manager_lock_deep_sleep();
+    }
+
+    ~DeepSleepLock()
+    {
+        if (_lock_count) {
+            sleep_manager_unlock_deep_sleep();
+        }
+    }
+
+    /** Mark the start of a locked deep sleep section
+     */
+    void lock()
+    {
+        uint16_t count = core_util_atomic_incr_u16(&_lock_count, 1);
+        if (1 == count) {
+            sleep_manager_lock_deep_sleep();
+        }
+        if (0 == count) {
+            error("DeepSleepLock overflow (> USHRT_MAX)");
+        }
+    }
+
+    /** Mark the end of a locked deep sleep section
+     */
+    void unlock()
+    {
+        uint16_t count = core_util_atomic_decr_u16(&_lock_count, 1);
+        if (count == 0) {
+            sleep_manager_unlock_deep_sleep();
+        }
+        if (count == USHRT_MAX) {
+            core_util_critical_section_exit();
+            error("DeepSleepLock underflow (< 0)");
+        }
+    }
+};
+
+}
+
+#endif