diff --git a/units/template/!README.TXT b/units/template/!README.TXT
new file mode 100644
index 0000000..d7cf9a3
--- /dev/null
+++ b/units/template/!README.TXT
@@ -0,0 +1,2 @@
+This is a template unit, used for reference when creating new units.
+It is not registered into the unit registry, and cannot be instantiated.
diff --git a/units/template/_tpl_api.c b/units/template/_tpl_api.c
new file mode 100644
index 0000000..0779fc2
--- /dev/null
+++ b/units/template/_tpl_api.c
@@ -0,0 +1,11 @@
+//
+// Created by MightyPork on 2018/02/03.
+//
+
+#include "platform.h"
+#include "unit_base.h"
+#include "unit_tpl.h"
+
+#define TPL_INTERNAL
+#include "_tpl_internal.h"
+
diff --git a/units/template/_tpl_init.c b/units/template/_tpl_init.c
new file mode 100644
index 0000000..80c6eb4
--- /dev/null
+++ b/units/template/_tpl_init.c
@@ -0,0 +1,50 @@
+//
+// Created by MightyPork on 2018/02/03.
+//
+
+#include "platform.h"
+#include "unit_base.h"
+
+#define TPL_INTERNAL
+#include "_tpl_internal.h"
+#include "_tpl_init.h"
+
+/** Allocate data structure and set defaults */
+error_t TPL_preInit(Unit *unit)
+{
+    struct priv *priv = unit->data = calloc_ck(1, sizeof(struct priv));
+    if (priv == NULL) return E_OUT_OF_MEM;
+
+    //
+
+    return E_SUCCESS;
+}
+
+/** Finalize unit set-up */
+error_t TPL_init(Unit *unit)
+{
+    bool suc = true;
+    struct priv *priv = unit->data;
+
+    //
+
+    return E_SUCCESS;
+}
+
+
+/** Tear down the unit */
+void TPL_deInit(Unit *unit)
+{
+    struct priv *priv = unit->data;
+
+    // de-init peripherals
+    if (unit->status == E_SUCCESS ) {
+        //
+    }
+
+    // Release all resources, deinit pins
+    rsc_teardown(unit);
+
+    // Free memory
+    free_ck(unit->data);
+}
diff --git a/units/template/_tpl_init.h b/units/template/_tpl_init.h
new file mode 100644
index 0000000..2afaa62
--- /dev/null
+++ b/units/template/_tpl_init.h
@@ -0,0 +1,20 @@
+//
+// Created by MightyPork on 2018/02/03.
+//
+
+#ifndef GEX_F072_TPL_INIT_H
+#define GEX_F072_TPL_INIT_H
+
+#ifndef TPL_INTERNAL
+#error bad include!
+#endif
+
+#include "unit_base.h"
+
+/** Finalize unit set-up */
+error_t TPL_init(Unit *unit);
+
+/** Tear down the unit */
+void TPL_deInit(Unit *unit);
+
+#endif //GEX_F072_TPL_INIT_H
diff --git a/units/template/_tpl_internal.h b/units/template/_tpl_internal.h
new file mode 100644
index 0000000..bcfa4fe
--- /dev/null
+++ b/units/template/_tpl_internal.h
@@ -0,0 +1,21 @@
+//
+// Created by MightyPork on 2018/02/03.
+//
+
+#ifndef GEX_F072_TPL_INTERNAL_H
+#define GEX_F072_TPL_INTERNAL_H
+
+#ifndef TPL_INTERNAL
+#error bad include!
+#endif
+
+#include "unit_base.h"
+
+/** Private data structure */
+struct priv {
+    // settings
+
+    // internal state
+};
+
+#endif //GEX_F072_TPL_INTERNAL_H
diff --git a/units/template/_tpl_settings.c b/units/template/_tpl_settings.c
new file mode 100644
index 0000000..2a1be82
--- /dev/null
+++ b/units/template/_tpl_settings.c
@@ -0,0 +1,59 @@
+//
+// Created by MightyPork on 2018/02/03.
+//
+
+#include "platform.h"
+#include "unit_base.h"
+
+#define TPL_INTERNAL
+#include "_tpl_internal.h"
+#include "_tpl_settings.h"
+
+/** Load from a binary buffer stored in Flash */
+void TPL_loadBinary(Unit *unit, PayloadParser *pp)
+{
+    struct priv *priv = unit->data;
+
+    uint8_t version = pp_u8(pp);
+    (void)version;
+
+    //
+}
+
+/** Write to a binary buffer for storing in Flash */
+void TPL_writeBinary(Unit *unit, PayloadBuilder *pb)
+{
+    struct priv *priv = unit->data;
+
+    pb_u8(pb, 0); // version
+
+    //
+}
+
+// ------------------------------------------------------------------------
+
+/** Parse a key-value pair from the INI file */
+error_t TPL_loadIni(Unit *unit, const char *key, const char *value)
+{
+    bool suc = true;
+    struct priv *priv = unit->data;
+
+    if (false) {
+        //
+    }
+    else {
+        return E_BAD_KEY;
+    }
+
+    if (!suc) return E_BAD_VALUE;
+    return E_SUCCESS;
+}
+
+/** Generate INI file section for the unit */
+void TPL_writeIni(Unit *unit, IniWriter *iw)
+{
+    struct priv *priv = unit->data;
+
+    //
+}
+
diff --git a/units/template/_tpl_settings.h b/units/template/_tpl_settings.h
new file mode 100644
index 0000000..79b8911
--- /dev/null
+++ b/units/template/_tpl_settings.h
@@ -0,0 +1,31 @@
+//
+// Created by MightyPork on 2018/02/03.
+//
+
+#ifndef GEX_F072_TPL_SETTINGS_H
+#define GEX_F072_TPL_SETTINGS_H
+
+#ifndef TPL_INTERNAL
+#error bad include!
+#endif
+
+#include "unit_base.h"
+
+/** Allocate data structure and set defaults */
+error_t TPL_preInit(Unit *unit);
+
+/** Load from a binary buffer stored in Flash */
+void TPL_loadBinary(Unit *unit, PayloadParser *pp);
+
+/** Write to a binary buffer for storing in Flash */
+void TPL_writeBinary(Unit *unit, PayloadBuilder *pb);
+
+// ------------------------------------------------------------------------
+
+/** Parse a key-value pair from the INI file */
+error_t TPL_loadIni(Unit *unit, const char *key, const char *value);
+
+/** Generate INI file section for the unit */
+void TPL_writeIni(Unit *unit, IniWriter *iw);
+
+#endif //GEX_F072_TPL_SETTINGS_H
diff --git a/units/template/unit_tpl.c b/units/template/unit_tpl.c
new file mode 100644
index 0000000..566636e
--- /dev/null
+++ b/units/template/unit_tpl.c
@@ -0,0 +1,58 @@
+//
+// Created by MightyPork on 2017/11/25.
+//
+
+#include "unit_base.h"
+#include "unit_tpl.h"
+
+#define TPL_INTERNAL
+#include "_tpl_internal.h"
+#include "_tpl_settings.h"
+#include "_tpl_init.h"
+
+// ------------------------------------------------------------------------
+
+enum TplCmd_ {
+    //
+};
+
+/** Handle a request message */
+static error_t TPL_handleRequest(Unit *unit, TF_ID frame_id, uint8_t command, PayloadParser *pp)
+{
+    switch (command) {
+        default:
+            return E_UNKNOWN_COMMAND;
+    }
+}
+
+// ------------------------------------------------------------------------
+
+/**
+ * Handle update-tick (if configured in init)
+ *
+ * @param unit
+ */
+static void TPL_updateTick(Unit *unit)
+{
+    //
+}
+
+// ------------------------------------------------------------------------
+
+/** Unit template */
+const UnitDriver UNIT_TPL = {
+    .name = "TPL",
+    .description = "Template unit",
+    // Settings
+    .preInit = TPL_preInit,
+    .cfgLoadBinary = TPL_loadBinary,
+    .cfgWriteBinary = TPL_writeBinary,
+    .cfgLoadIni = TPL_loadIni,
+    .cfgWriteIni = TPL_writeIni,
+    // Init
+    .init = TPL_init,
+    .deInit = TPL_deInit,
+    // Function
+    .handleRequest = TPL_handleRequest,
+    .updateTick = TPL_updateTick,
+};
diff --git a/units/template/unit_tpl.h b/units/template/unit_tpl.h
new file mode 100644
index 0000000..76d4f10
--- /dev/null
+++ b/units/template/unit_tpl.h
@@ -0,0 +1,42 @@
+//
+// Created by MightyPork on 2017/11/25.
+//
+// Digital input unit; single or multiple pin read access on one port (A-F)
+//
+
+#ifndef U_DIN_H
+#define U_DIN_H
+
+#include "unit.h"
+
+extern const UnitDriver UNIT_DIN;
+
+/**
+ * Read pins
+ *
+ * @param unit - unit instance
+ * @param packed - output; the packed (right aligned) bits representing the pins, highest to lowest, are written here.
+ * @return success
+ */
+error_t UU_DI_Read(Unit *unit, uint16_t *packed);
+
+/**
+ * Arm pins for trigger generation
+ *
+ * @param unit - unit instance
+ * @param arm_single_packed - packed bit map of pins to arm for single trigger
+ * @param arm_auto_packed - packed bit map of pins to arm for auto trigger (repeated)
+ * @return success
+ */
+error_t UU_DI_Arm(Unit *unit, uint16_t arm_single_packed, uint16_t arm_auto_packed);
+
+/**
+ * Dis-arm pins to not generate events
+ *
+ * @param unit - unit instance
+ * @param disarm_packed - packed bit map of pins to dis-arm
+ * @return success
+ */
+error_t UU_DI_DisArm(Unit *unit, uint16_t disarm_packed);
+
+#endif //U_DIN_H