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diff --git a/src/common/Core/common.h b/src/common/Core/common.h
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+++ b/src/common/Core/common.h
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+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2016 Matthias P. Braendli
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+*/
+
+/* A set of common routines for internal timekeeping and a LFSR to generate
+ * a random number
+ */
+
+#pragma once
+
+#include <stdint.h>
+#include <time.h>
+
+/* Feature defines */
+#define ENABLE_PSK31 0
+
+#define FLOAT_PI 3.1415926535897932384f
+
+void common_init(void);
+
+// Return the current timestamp in milliseconds. Timestamps are monotonic, and not
+// wall clock time.
+uint64_t timestamp_now(void);
+
+// Calculate local time from GPS time, including daylight saving time
+// Return 1 on success, 0 on failure
+// A call to this function will invalidate the information inside 'time'
+// regardless of return value.
+int local_time(struct tm *time);
+
+// Try to calculate local time, based on a past valid local time and the current timestamp
+// Return 1 on success, 0 on failure
+int local_derived_time(struct tm *time);
+
+// Return either 0 or 1, somewhat randomly
+int random_bool(void);
+
+// Fault handling mechanism
+#define FAULT_SOURCE_MAIN  1
+#define FAULT_SOURCE_GPS 2
+#define FAULT_SOURCE_I2C 3
+#define FAULT_SOURCE_USART 4
+#define FAULT_SOURCE_TASK_OVERFLOW 5
+#define FAULT_SOURCE_CW_AUDIO_QUEUE 6
+#define FAULT_SOURCE_ADC1 7
+#define FAULT_SOURCE_TIM6_ISR 8
+#define FAULT_SOURCE_ADC2_QUEUE 9
+#define FAULT_SOURCE_ADC2_IRQ 10
+void trigger_fault(int source);
+
+int find_last_sunday(const struct tm*);
+
+#ifdef SIMULATOR
+void __disable_irq(void);
+#else
+void hard_fault_handler_c(uint32_t *);
+#endif
+
+// Round a value to the nearest 0.5
+float round_float_to_half_steps(float value);
+
+#define GPS_MS_TIMEOUT 2000ul