tests: added xtimer long-term test

tests/xtimer_longterm/Makefile

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+APPLICATION = xtimer_longterm
+include ../Makefile.tests_common
+
+USEMODULE += xtimer
+
+include $(RIOTBASE)/Makefile.include

tests/xtimer_longterm/README.md

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+Expected result
+===============
+You should see a number of different messages, printed out on certain intervals:
+
+`msg   -- 14min -- 14 ticks since` -> timeout by xtimer_msg every 14 minutes
+`sleep -- 18min -- 18 ticks since` -> timeout by xtimer_usleep, every 18 minutes
+`msg   -- 3min  -- 3 ticks since`  -> timeout by xtimer_msg, every 3 minutes
+`sleep -- 5min  -- 5 ticks since`  -> timeout by xtimer_usleep, every 5 minutes
+`TICK  -- 1min`  -> event created by aggregation counter every 1 min
+
+Background
+==========
+This test is supposed to find out, if the `xtimer` behaves correctly when
+scheduling multiple long and short term timers. For this we schedule two 'long'
+and two 'mid'-term timers, while in parallel running one periodic fast timer.
+
+The 'long' term timers are triggering every 14 and 18 min (so in this context
+we consider this long-term...). The mid-term timers are set to 3 and 5 minutes.
+Both kind of timers have one that is using `xtimer_usleep` and one that is
+using `xtimer_set_msg`.
+
+The short-term timer is triggered every 50ms and is using `xtimer_sleep_until`.
+Each time this timer triggers, it increments a software counter, which triggers
+then a message every minute. A 50ms interval should be small enough, to trigger
+also for 16-bit wide timers at least once in every timer period.
+
+On each mid- and long-term timer event, the output shows also the number of
+fast timer (1min timer) ticks, that have been triggered since a timer was
+triggered last. This number should be equal to the timers interval.
+
+For reasonable results, you should run this test at least for some ours...

tests/xtimer_longterm/main.c

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+/*
+ * Copyright (C) 2016 Freie Universität Berlin
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @ingroup     tests
+ * @{
+ *
+ * @file
+ * @brief       xtimer_msg test application
+ *
+ * @author      Hauke Petersen <hauke.petersen@fu-berlin.de>
+ * @}
+ */
+
+#include <stdio.h>
+#include <time.h>
+
+#include "xtimer.h"
+#include "thread.h"
+#include "msg.h"
+
+
+/* some internally used msg types */
+#define MSG_LONG                (0xcafe)
+#define MSG_MID                 (0xe5e1)
+#define MSG_TICK                (0xaffe)
+
+/* define sleep and timeout intervals */
+#define MIN_TO_TICKS(min)       (XTIMER_USEC_TO_TICKS(60UL * 1000 * 1000 * min))
+#define INT_LONG_MSG            (MIN_TO_TICKS(14))
+#define INT_LONG_SLEEP          (MIN_TO_TICKS(18))
+#define INT_MID_MSG             (MIN_TO_TICKS(3))
+#define INT_MID_SLEEP           (MIN_TO_TICKS(5))
+#define INT_SHORT               (XTIMER_USEC_TO_TICKS(50UL * 1000))
+
+/* and some timeout conditions */
+#define SHORT_MIN_REACHED       (60 * 20)    /* 60 * 20 * 50ms = 1min */
+
+/* configure the print threads message queue */
+#define MSG_Q_SIZE              (8U)
+static msg_t mq[MSG_Q_SIZE];
+
+/* allocate some stacks */
+static char long_stack[THREAD_STACKSIZE_MAIN];
+static char mid_stack[THREAD_STACKSIZE_MAIN];
+static char short_stack[THREAD_STACKSIZE_MAIN];
+
+/* the main threads PID */
+static kernel_pid_t print_pid;
+
+/* allocate timer structs for mid- and long-term timers */
+static xtimer_t long_timer;
+static xtimer_t mid_timer;
+
+/* and some software counters */
+static int long_msg_ticks = 0;
+static int long_sleep_ticks = 0;
+static int mid_msg_ticks = 0;
+static int mid_sleep_ticks = 0;
+static int short_ticks = 0;
+
+
+void *long_sleep(void *arg)
+{
+    (void) arg;
+
+    while (1) {
+        printf("sleep -- 18min -- %i ticks since\n", long_sleep_ticks);
+        long_sleep_ticks = 0;
+
+        xtimer_usleep(INT_LONG_SLEEP);
+    }
+
+    return NULL;
+}
+
+void *mid_sleep(void *arg)
+{
+    (void) arg;
+
+    while (1) {
+        printf("sleep -- 5min  -- %i ticks since\n", mid_sleep_ticks);
+        mid_sleep_ticks = 0;
+
+        xtimer_usleep(INT_MID_SLEEP);
+    }
+
+    return NULL;
+}
+
+void *ticker(void *arg)
+{
+    (void)arg;
+    uint32_t base = xtimer_now();
+
+    while (1) {
+        ++short_ticks;
+
+        if (short_ticks == SHORT_MIN_REACHED) {
+            short_ticks = 0;
+            ++long_msg_ticks;
+            ++long_sleep_ticks;
+            ++mid_msg_ticks;
+            ++mid_sleep_ticks;
+
+            msg_t msg;
+            msg.type = MSG_TICK;
+            msg_send(&msg, print_pid);
+        }
+
+        xtimer_usleep_until(&base, INT_SHORT);
+    }
+
+    return NULL;
+}
+
+int main(void)
+{
+    msg_t msg_mid, msg_long, msg;
+
+    puts("xtimer long-term test");
+    puts("Refer to the README to get information on the expected output.");
+
+    /* save the main threads PID */
+    print_pid = thread_getpid();
+
+    /* initialize the message queue */
+    msg_init_queue(mq, MSG_Q_SIZE);
+
+    /* create the other threads */
+    thread_create(long_stack, sizeof(long_stack), THREAD_PRIORITY_MAIN - 1,
+                  0, long_sleep, NULL, "long_sleep");
+    thread_create(mid_stack, sizeof(mid_stack), THREAD_PRIORITY_MAIN - 2,
+                  0, mid_sleep, NULL, "mid_sleep");
+    thread_create(short_stack, sizeof(short_stack), THREAD_PRIORITY_MAIN - 3,
+                  0, ticker, NULL, "ticks");
+
+    /* initiate the mid- and long-term messages */
+    msg_long.type = MSG_LONG;
+    xtimer_set_msg(&long_timer, INT_LONG_MSG, &msg_long, print_pid);
+    msg_mid.type = MSG_MID;
+    xtimer_set_msg(&mid_timer, INT_MID_MSG, &msg_mid, print_pid);
+
+    /* watch for incoming messages */
+    while (1) {
+        msg_receive(&msg);
+
+        switch (msg.type) {
+            case MSG_LONG:
+                printf("msg   -- 14min -- %i ticks since\n", long_msg_ticks);
+                long_msg_ticks = 0;
+                xtimer_set_msg(&long_timer, INT_LONG_MSG, &msg_long, print_pid);
+                break;
+
+            case MSG_MID:
+                printf("msg   -- 3min  -- %i ticks since\n", mid_msg_ticks);
+                mid_msg_ticks = 0;
+                xtimer_set_msg(&mid_timer, INT_MID_MSG, &msg_mid, print_pid);
+                break;
+
+            case MSG_TICK:
+                puts("TICK  -- 1min");
+                break;
+
+            default:
+                break;
+        }
+    }
+
+    return 0;
+}