Added optional uptime and duty-cycle statistics. Default is off. Can be enabled with YOTTA_CFG_MINAR_STATS = true.

Author: Marcus Chang

minar-platform/minar_platform_stats.h

@@ -0,0 +1,43 @@
+/*
+ * Copyright (c) 2016, ARM Limited, All Rights Reserved
+ * 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.
+ */
+
+#ifndef MINAR_PLATFORM_STATS_H
+#define MINAR_PLATFORM_STATS_H
+
+#include <stdint.h>
+
+namespace minar {
+namespace stats {
+
+/**
+ * @brief Get uptime in seconds.
+ * @details Uptime is seconds since last reboot.
+ * @return uint64_t uptime in seconds.
+ */
+uint64_t getUptime();
+
+/**
+ * @brief Get seconds spent in active (non-sleep) mode.
+ * @details The active time includes time used by interrupt handlers.
+ * @return uint64_t active time in seconds.
+ */
+uint64_t getActive();
+
+};
+};
+
+#endif // MINAR_PLATFORM_STATS_H

source/mbed_platform.cpp

@@ -29,6 +29,30 @@ static bool timeIsInPeriod(minar::platform::tick_t start, minar::platform::tick_
 
 ///////////////////////////////////////////////////////////////////////////////
 
+// functions and variables for keeping track of uptime and duty-cycle
+static uint64_t total_sleep = 0;
+static uint64_t total_active = 0;
+static minar::platform::tick_t last_wakeup = 0;
+static minar::platform::tick_t last_gotosleep = 0;
+
+namespace minar {
+namespace stats {
+
+/* Return uptime in seconds. */
+uint64_t getUptime() {
+    return (total_active + total_sleep) / MINAR_PLATFORM_TIME_BASE;
+}
+
+/* Return seconds spent in non-sleep mode. */
+uint64_t getActive() {
+    return total_active / MINAR_PLATFORM_TIME_BASE;
+}
+
+};
+};
+
+///////////////////////////////////////////////////////////////////////////////
+
 namespace minar {
 namespace platform {
 
@@ -69,12 +93,25 @@ void sleepFromUntil(tick_t now, tick_t until){
     } else {
         const uint32_t next_int = lp_ticker_get_compare_match();
 
+#if YOTTA_CFG_MINAR_STATS
+        // update stats
+        tick_t now = lp_ticker_read();
+        total_active += now - last_wakeup;
+        total_sleep += last_wakeup - last_gotosleep;
+        last_gotosleep = now;
+#endif
+
         if(timeIsInPeriod(now, until, next_int)){
             lp_ticker_sleep_until(now, until);
         } else {
             // existing compare match is sooner, go to sleep
             sleep();
         }
+
+#if YOTTA_CFG_MINAR_STATS
+        // update stats
+        last_wakeup = lp_ticker_read();
+#endif
     }
 }