Diff: hal/mbed_sleep_manager.c

Revision:

174:b96e65c34a4d

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hal/mbed_sleep_manager.c	Mon Oct 02 15:33:19 2017 +0100
@@ -0,0 +1,92 @@
+/* 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.
+ */
+
+#include "mbed_sleep.h"
+#include "mbed_critical.h"
+#include "sleep_api.h"
+#include "mbed_error.h"
+#include <limits.h>
+
+#if DEVICE_SLEEP
+
+// deep sleep locking counter. A target is allowed to deep sleep if counter == 0
+static uint16_t deep_sleep_lock = 0U;
+
+void sleep_manager_lock_deep_sleep(void)
+{
+    core_util_critical_section_enter();
+    if (deep_sleep_lock == USHRT_MAX) {
+        core_util_critical_section_exit();
+        error("Deep sleep lock would overflow (> USHRT_MAX)");
+    }
+    core_util_atomic_incr_u16(&deep_sleep_lock, 1);
+    core_util_critical_section_exit();
+}
+
+void sleep_manager_unlock_deep_sleep(void)
+{
+    core_util_critical_section_enter();
+    if (deep_sleep_lock == 0) {
+        core_util_critical_section_exit();
+        error("Deep sleep lock would underflow (< 0)");
+    }
+    core_util_atomic_decr_u16(&deep_sleep_lock, 1);
+    core_util_critical_section_exit();
+}
+
+bool sleep_manager_can_deep_sleep(void)
+{
+    return deep_sleep_lock == 0 ? true : false;
+}
+
+void sleep_manager_sleep_auto(void)
+{
+    core_util_critical_section_enter();
+// debug profile should keep debuggers attached, no deep sleep allowed
+#ifdef MBED_DEBUG
+    hal_sleep();
+#else
+    if (sleep_manager_can_deep_sleep()) {
+        hal_deepsleep();
+    } else {
+        hal_sleep();
+    }
+#endif
+    core_util_critical_section_exit();
+}
+
+#else
+
+// locking is valid only if DEVICE_SLEEP is defined
+// we provide empty implementation
+
+void sleep_manager_lock_deep_sleep(void)
+{
+
+}
+
+void sleep_manager_unlock_deep_sleep(void)
+{
+
+}
+
+bool sleep_manager_can_deep_sleep(void)
+{
+    // no sleep implemented
+    return false;
+}
+
+#endif