diff --git a/include/vfo.h b/include/vfo.h
new file mode 100644
index 0000000..21092ee
--- /dev/null
+++ b/include/vfo.h
@@ -0,0 +1,69 @@
+/*
+ * Copyright (c) 2019, Vincent Hervieux vincent.hervieux@gmail.com
+ * All rights reserved.
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * * Neither the name of the author Vincent Hervieux, nor the
+ *   names of its contributors may be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE REGENTS AND CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+#ifndef VFO_H
+#define VFO_H
+
+/* Commonly used program enumerations and structures goes here */
+//#define DEBUG
+#define WATCHDOG
+#define TRANSVERTER
+/* Display s-meter or simply SMETER_REPLACEMENT_TEXT if not defined */
+#define SMETER_DISPLAY
+#ifndef SMETER_DISPLAY
+#define SMETER_REPLACEMENT_TEXT F(" PRESIDENT FRANKLIN ")
+#endif
+
+/// Enumerations
+/* Aim to describe the cursor position on the screen */
+enum {
+    CURSOR_POS_NONE = 0,
+    CURSOR_POS_FREQ_DIG1 = 1,
+    CURSOR_POS_FREQ_DIG2,
+    CURSOR_POS_FREQ_DIG3,
+    CURSOR_POS_FREQ_DIG4,
+    CURSOR_POS_FREQ_DIG5,
+    CURSOR_POS_FREQ_DIG6,
+    CURSOR_POS_FREQ_DIG7,
+    CURSOR_POS_MAX = CURSOR_POS_FREQ_DIG7
+};
+
+    /* On Superstart 3900 and derivated :
+     * FI on CW, AM, FM is 10695kHz
+     * FI on LSB is 10697.5kHz
+     * FI on USB is 10692.5kHz
+     */
+enum {
+    MOD_CW = 0,
+    MOD_AM,
+    MOD_FM,
+    MOD_USB,
+    MOD_LSB
+};
+
+
+#endif /* VFO_H */
+
diff --git a/include/watchdog.h b/include/watchdog.h
new file mode 100644
index 0000000..16f8a32
--- /dev/null
+++ b/include/watchdog.h
@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2019, Vincent Hervieux vincent.hervieux@gmail.com
+ * All rights reserved.
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * * Neither the name of the author Vincent Hervieux, nor the
+ *   names of its contributors may be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE REGENTS AND CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+// from avr/wdt.h
+#define wdt_reset() __asm__ __volatile__ ("wdr")
+// friendly name for watchodog software interruption
+#define wdt_interrupt() ISR(WDT_vect)
+
+inline void wdt_enable()
+{
+  // Unlock watchdog register
+  WDTCSR = (1 << WDCE) | (1 << WDE);
+  // Set WDP2, WDP1 and WDP0 for 2 seconds countdown
+  // Set WDIE and WDE to enable a software interrrupt followed by µC reset
+  WDTCSR = 0b01001111;
+}