diff --git a/cw/utils.h b/cw/utils.h
new file mode 100644
index 00000000..f35ee2d0
--- /dev/null
+++ b/cw/utils.h
@@ -0,0 +1,54 @@
+/*
+ *  A sample application transmitting AFSK at 1200 baud
+ *
+ *  Portions Copyright (C) 2018 Libre Space Foundation
+ *  Portions Copyright (C) 2018 Jonathan Brandenburg
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef UTILS_H_
+#define UTILS_H_
+
+#include <sys/time.h>
+
+#define BIT(x)   (1 << x)
+
+static inline size_t min_ul(size_t x, size_t y) {
+    size_t ret = x < y ? x : y;
+    return ret;
+}
+
+/**
+ *
+ * @return the milliseconds from the start of the program.
+ * Time is handled based on TIM2 timer.
+ */
+static inline uint32_t millis() {
+    static struct timeval tv_start;
+    static int tv_start_initialized = 0;
+    if (!tv_start_initialized) {
+        gettimeofday(&tv_start, NULL);
+    }
+
+    struct timeval tv_current;
+    gettimeofday(&tv_current, NULL);
+
+    uint32_t millis_elapsed = 0;
+    millis_elapsed = (uint32_t) (tv_current.tv_sec - tv_start.tv_sec) * 1000;
+    millis_elapsed += (uint32_t) (tv_current.tv_usec - tv_start.tv_usec) / 1000;
+    return millis_elapsed;
+}
+
+#endif /* UTILS_H_ */