tests/ztimer_periodic: initial commit

tests/ztimer_periodic/Makefile

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+DEVELHELP ?= 0
+include ../Makefile.tests_common
+
+USEMODULE += fmt
+USEMODULE += ztimer_usec ztimer_msec
+
+include $(RIOTBASE)/Makefile.include

tests/ztimer_periodic/README.md

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+# Introduction
+
+This test application does some basic functionality testing of ztimer_periodic.

tests/ztimer_periodic/main.c

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+/*
+ * Copyright (C) 2020 Kaspar Schleiser <kaspar@schleiser.de>
+ *               2020 Freie Universität Berlin
+ *               2020 Inria
+ *
+ * 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     test
+ * @{
+ *
+ * @file
+ * @brief       ztimer periodic test application
+ *
+ * @author      Kaspar Schleiser <kaspar@schleiser.de>
+ *
+ * @}
+ */
+
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <inttypes.h>
+
+#include "ztimer.h"
+#include "ztimer/periodic.h"
+#include "fmt.h"
+#include "mutex.h"
+
+static mutex_t _mutex = MUTEX_INIT_LOCKED;
+
+#define MAX_OFFSET 2
+#define N 5
+#define INTERVAL 100LU
+
+static uint32_t _times[N];
+
+static int callback(void *arg)
+{
+    (void)arg;
+    static int count = 0;
+
+    _times[count] = ztimer_now(ZTIMER_MSEC);
+
+    count += 1;
+
+    /* enable this to test underflow behavior */
+#if 0
+    if (count == 2) {
+        ztimer_spin(ZTIMER_MSEC, INTERVAL*2);
+    }
+#endif
+
+    if (count == N) {
+        mutex_unlock(&_mutex);
+    }
+
+    return (count == N);
+}
+
+int main(void)
+{
+    ztimer_periodic_t t;
+
+    ztimer_periodic_init(ZTIMER_MSEC, &t, callback, NULL, INTERVAL);
+    uint32_t last = ztimer_now(ZTIMER_MSEC);
+
+    ztimer_periodic_start(&t);
+
+    /* wait for periodic to trigger N times */
+    mutex_lock(&_mutex);
+
+    int failed = 0;
+
+    for (unsigned i = 0; i < N; i++) {
+        uint32_t offset = labs((int32_t)(_times[i] - INTERVAL - last));
+        printf("i: %u time: %" PRIu32 " offset: %" PRIu32 "\n",
+               i, _times[i], offset);
+        if (offset > MAX_OFFSET) {
+            failed = 1;
+        }
+        last = _times[i];
+    }
+
+    if (!failed) {
+        print_str("Test successful.\n");
+    }
+    else {
+        print_str("Test failed!\n");
+    }
+}

tests/ztimer_periodic/tests/01-run.py

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+#!/usr/bin/env python3
+
+# Copyright (C) 2019 Kaspar Schleiser <kaspar@schleiser.de>
+#
+# 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.
+
+import sys
+from testrunner import run
+
+
+def testfunc(child):
+    child.expect_exact("Test successful.")
+
+
+if __name__ == "__main__":
+    sys.exit(run(testfunc))