diff --git a/gex.mk b/gex.mk
index 922d0d6..91ca96f 100644
--- a/gex.mk
+++ b/gex.mk
@@ -15,6 +15,7 @@ GEX_SRC_DIR = \
     User/units/spi \
     User/units/adc \
     User/units/sipo \
+    User/units/fcap \
     User/TinyFrame \
     User/CWPack \
     User/tasks
diff --git a/platform/irq_dispatcher.c b/platform/irq_dispatcher.c
index be62258..39a175a 100644
--- a/platform/irq_dispatcher.c
+++ b/platform/irq_dispatcher.c
@@ -61,6 +61,7 @@ static struct callbacks_ {
     struct cbslot dma2_7;
     struct cbslot dma2_8;
 
+    struct cbslot tim2;
     struct cbslot tim6;
     struct cbslot tim7;
     struct cbslot tim15;
@@ -102,7 +103,7 @@ void irqd_init(void)
     HAL_NVIC_SetPriority(ADC1_COMP_IRQn, 1, 0); // ADC group completion - higher prio than DMA to let it handle the last halfword first
 
 //    NVIC_EnableIRQ(TIM1_IRQn);                  /*!< TIM1 global Interrupt                                          */
-//    NVIC_EnableIRQ(TIM2_IRQn);                  /*!< TIM2 global Interrupt                                           */
+    NVIC_EnableIRQ(TIM2_IRQn);                  /*!< TIM2 global Interrupt                                           */
 //    NVIC_EnableIRQ(TIM3_IRQn);                  /*!< TIM3 global Interrupt                                           */
 
     NVIC_EnableIRQ(TIM6_DAC_IRQn);              /*!< TIM6 global and DAC channel underrun error Interrupt            */
@@ -159,6 +160,7 @@ static struct cbslot *get_slot_for_periph(void *periph)
         else if (periph == USART5) slot = &callbacks.usart5;
 #endif
 
+    else if (periph == TIM2) slot = &callbacks.tim2;
     else if (periph == TIM6) slot = &callbacks.tim6;
     else if (periph == TIM7) slot = &callbacks.tim7;
     else if (periph == TIM15) slot = &callbacks.tim15;
@@ -304,6 +306,11 @@ void EXTI4_15_IRQHandler(void)
 
 // TIM14 is used to generate HAL timebase and its handler is in the file "timebase.c"
 
+void TIM2_IRQHandler(void)
+{
+    CALL_IRQ_HANDLER(callbacks.tim2);
+}
+
 void TIM6_DAC_IRQHandler(void)
 {
     CALL_IRQ_HANDLER(callbacks.tim6);
diff --git a/platform/platform.c b/platform/platform.c
index c94b85f..27b73e2 100644
--- a/platform/platform.c
+++ b/platform/platform.c
@@ -2,6 +2,7 @@
 // Created by MightyPork on 2017/11/26.
 //
 
+#include <units/fcap/unit_fcap.h>
 #include "platform.h"
 #include "usbd_core.h"
 #include "USB/usb_device.h"
@@ -88,6 +89,7 @@ void plat_init_resources(void)
     ureg_add_type(&UNIT_1WIRE);
     ureg_add_type(&UNIT_ADC);
     ureg_add_type(&UNIT_SIPO);
+    ureg_add_type(&UNIT_FCAP);
 
     // Free all present resources
     {
diff --git a/units/fcap/_fcap_api.c b/units/fcap/_fcap_api.c
new file mode 100644
index 0000000..81e1d9e
--- /dev/null
+++ b/units/fcap/_fcap_api.c
@@ -0,0 +1,11 @@
+//
+// Created by MightyPork on 2018/02/03.
+//
+
+#include "platform.h"
+#include "unit_base.h"
+#include "unit_fcap.h"
+
+#define FCAP_INTERNAL
+#include "_fcap_internal.h"
+
diff --git a/units/fcap/_fcap_core.c b/units/fcap/_fcap_core.c
new file mode 100644
index 0000000..639b167
--- /dev/null
+++ b/units/fcap/_fcap_core.c
@@ -0,0 +1,197 @@
+//
+// Created by MightyPork on 2018/02/20.
+//
+
+#include "platform.h"
+
+#define FCAP_INTERNAL
+#include "_fcap_internal.h"
+
+static void UFCAP_PWMBurstReportJob(Job *job)
+{
+    Unit *unit = job->unit;
+    struct priv * const priv = unit->data;
+
+    uint8_t buf[20];
+    PayloadBuilder pb = pb_start(buf, 20, NULL);
+
+    pb_u16(&pb, PLAT_AHB_MHZ);
+    pb_u16(&pb, priv->pwm_burst.n_count);
+    pb_u64(&pb, priv->pwm_burst.period_acu);
+    pb_u64(&pb, priv->pwm_burst.ontime_acu);
+
+    assert_param(pb.ok);
+
+    com_respond_pb(priv->request_id, MSG_SUCCESS, &pb);
+
+    // timer is already stopped, now in OPMODE_BUSY
+    priv->opmode = OPMODE_IDLE;
+}
+
+void UFCAP_TimerHandler(void *arg)
+{
+    Unit *unit = arg;
+    assert_param(unit);
+    struct priv * const priv = unit->data;
+    assert_param(priv);
+
+    TIM_TypeDef * const TIMx = priv->TIMx;
+
+    if (priv->opmode == OPMODE_PWM_CONT) {
+        if (LL_TIM_IsActiveFlag_CC1(TIMx)) {
+//            assert_param(!LL_TIM_IsActiveFlag_CC1OVR(TIMx));
+            priv->pwm_cont.last_period = LL_TIM_IC_GetCaptureCH1(TIMx);
+            priv->pwm_cont.last_ontime = priv->pwm_cont.ontime;
+            LL_TIM_ClearFlag_CC1(TIMx);
+            LL_TIM_ClearFlag_CC1OVR(TIMx);
+        }
+
+        if (LL_TIM_IsActiveFlag_CC2(TIMx)) {
+//            assert_param(!LL_TIM_IsActiveFlag_CC2OVR(TIMx));
+            priv->pwm_cont.ontime = LL_TIM_IC_GetCaptureCH2(TIMx);
+            LL_TIM_ClearFlag_CC2(TIMx);
+            LL_TIM_ClearFlag_CC2OVR(TIMx);
+        }
+    }
+    else if (priv->opmode == OPMODE_PWM_BURST) {
+        if (LL_TIM_IsActiveFlag_CC1(TIMx)) {
+//            assert_param(!LL_TIM_IsActiveFlag_CC1OVR(TIMx));
+            const uint32_t period = LL_TIM_IC_GetCaptureCH1(TIMx);
+            const uint32_t ontime = priv->pwm_burst.ontime;
+
+            if (priv->pwm_burst.n_skip > 0) {
+                priv->pwm_burst.n_skip--;
+            } else {
+                priv->pwm_burst.ontime_acu += ontime;
+                priv->pwm_burst.period_acu += period;
+                if (++priv->pwm_burst.n_count == priv->pwm_burst.n_target) {
+                    priv->opmode = OPMODE_BUSY;
+                    UFCAP_StopMeasurement(unit);
+
+                    Job j = {
+                        .cb = UFCAP_PWMBurstReportJob,
+                        .unit = unit,
+                    };
+                    scheduleJob(&j);
+                }
+            }
+
+            LL_TIM_ClearFlag_CC1(TIMx);
+            LL_TIM_ClearFlag_CC1OVR(TIMx);
+        }
+
+        if (LL_TIM_IsActiveFlag_CC2(TIMx)) {
+//            assert_param(!LL_TIM_IsActiveFlag_CC2OVR(TIMx));
+            priv->pwm_burst.ontime = LL_TIM_IC_GetCaptureCH2(TIMx);
+            LL_TIM_ClearFlag_CC2(TIMx);
+            LL_TIM_ClearFlag_CC2OVR(TIMx);
+        }
+    }
+    else if (priv->opmode == OPMODE_IDLE) {
+        // clear everything - in idle it would cycle in the handler forever
+        TIMx->SR = 0;
+    }
+}
+
+static void UFCAP_ClearTimerConfig(Unit *unit)
+{
+    struct priv * const priv = unit->data;
+    TIM_TypeDef * const TIMx = priv->TIMx;
+
+    // CLEAR CURRENT STATE, STOP
+    UFCAP_StopMeasurement(unit);
+
+    // CONFIGURE TIMER BASIC PARAMS
+    LL_TIM_SetPrescaler(TIMx, 0);
+    LL_TIM_SetAutoReload(TIMx, 0xFFFFFFFF);
+    LL_TIM_EnableARRPreload(TIMx);
+    LL_TIM_GenerateEvent_UPDATE(TIMx);
+}
+
+void UFCAP_StopMeasurement(Unit *unit)
+{
+    struct priv * const priv = unit->data;
+    TIM_TypeDef * const TIMx = priv->TIMx;
+
+    LL_TIM_DisableCounter(TIMx);
+    LL_TIM_DisableIT_CC1(TIMx);
+    LL_TIM_DisableIT_CC2(TIMx);
+    LL_TIM_ClearFlag_CC1(TIMx);
+    LL_TIM_ClearFlag_CC2(TIMx);
+    LL_TIM_ClearFlag_CC1OVR(TIMx);
+    LL_TIM_ClearFlag_CC2OVR(TIMx);
+    LL_TIM_SetCounter(TIMx, 0);
+}
+
+void UFCAP_SwitchMode(Unit *unit, enum fcap_opmode opmode)
+{
+    struct priv * const priv = unit->data;
+
+    if (opmode == priv->opmode) return;
+
+    priv->opmode = opmode;
+
+    switch (opmode) {
+        case OPMODE_IDLE:
+            // XXX maybe we should report the abort to the PC-side listener
+            UFCAP_StopMeasurement(unit);
+            break;
+
+        case OPMODE_PWM_CONT:
+            priv->pwm_cont.last_ontime = 0;
+            priv->pwm_cont.last_period = 0;
+            priv->pwm_cont.ontime = 0;
+            UFCAP_ConfigureForPWMCapture(unit); // is also stopped and restarted
+            break;
+
+        case OPMODE_PWM_BURST:
+            priv->pwm_burst.ontime = 0;
+            priv->pwm_burst.n_count = 0;
+            priv->pwm_burst.n_skip = 1; // discard the first cycle (will be incomplete)
+            priv->pwm_burst.period_acu = 0;
+            priv->pwm_burst.ontime_acu = 0;
+            UFCAP_ConfigureForPWMCapture(unit); // is also stopped and restarted
+            break;
+        default:
+            trap("Unhandled opmode %d", (int)opmode);
+    }
+}
+
+void UFCAP_ConfigureForPWMCapture(Unit *unit)
+{
+    struct priv * const priv = unit->data;
+    TIM_TypeDef * const TIMx = priv->TIMx;
+    const uint32_t ll_ch_a = priv->ll_ch_a;
+    const uint32_t ll_ch_b = priv->ll_ch_b;
+
+    UFCAP_ClearTimerConfig(unit);
+
+    // Enable channels and select mapping to TIx signals
+
+    // A - will be used to measure period
+    // B - will be used to measure the duty cycle
+
+    //         _________                  ______
+    // _______|         |________________|
+    //        A         B                A
+    //        irq       irq,cap          irq
+    //        reset
+
+    // B irq may be used if we want to measure a pulse width
+
+    // Normally TI1 = CH1, TI2 = CH2.
+    // It's possible to select the other channel, which we use to connect both TIx to the shame CHx.
+    LL_TIM_IC_SetActiveInput(TIMx, ll_ch_a, priv->a_direct ? LL_TIM_ACTIVEINPUT_DIRECTTI   : LL_TIM_ACTIVEINPUT_INDIRECTTI);
+    LL_TIM_IC_SetActiveInput(TIMx, ll_ch_b, priv->a_direct ? LL_TIM_ACTIVEINPUT_INDIRECTTI : LL_TIM_ACTIVEINPUT_DIRECTTI);
+    LL_TIM_CC_EnableChannel(TIMx, ll_ch_a | ll_ch_b);
+
+    LL_TIM_IC_SetPolarity(TIMx, ll_ch_a, LL_TIM_IC_POLARITY_RISING);
+    LL_TIM_IC_SetPolarity(TIMx, ll_ch_b, LL_TIM_IC_POLARITY_FALLING);
+    LL_TIM_SetSlaveMode(TIMx, LL_TIM_SLAVEMODE_RESET);
+    LL_TIM_SetTriggerInput(TIMx, LL_TIM_TS_TI1FP1); // Use Filtered Input 1 (TI1)
+    LL_TIM_EnableMasterSlaveMode(TIMx);
+
+    LL_TIM_EnableIT_CC1(TIMx);
+    LL_TIM_EnableIT_CC2(TIMx);
+    LL_TIM_EnableCounter(TIMx);
+}
diff --git a/units/fcap/_fcap_init.c b/units/fcap/_fcap_init.c
new file mode 100644
index 0000000..469e309
--- /dev/null
+++ b/units/fcap/_fcap_init.c
@@ -0,0 +1,120 @@
+//
+// Created by MightyPork on 2018/02/03.
+//
+
+#include "platform.h"
+#include "unit_base.h"
+
+#define FCAP_INTERNAL
+#include "_fcap_internal.h"
+
+/** Allocate data structure and set defaults */
+error_t UFCAP_preInit(Unit *unit)
+{
+    struct priv *priv = unit->data = calloc_ck(1, sizeof(struct priv));
+    if (priv == NULL) return E_OUT_OF_MEM;
+
+    priv->signal_pname = 'A';
+    priv->signal_pnum = 0;
+
+    priv->opmode = OPMODE_PWM_CONT;
+
+    return E_SUCCESS;
+}
+
+/** Finalize unit set-up */
+error_t UFCAP_init(Unit *unit)
+{
+    bool suc = true;
+    struct priv *priv = unit->data;
+
+    // ---- Resolve what to configure ----
+
+    TIM_TypeDef * const TIMx = TIM2;
+    Resource timRsc = R_TIM2;
+
+    uint32_t ll_ch_a = 0;
+    uint32_t ll_ch_b = 0;
+
+    switch (priv->signal_pname) {
+        case 'A':
+            switch (priv->signal_pnum) {
+                case 5:
+                case 15:
+                case 0: ll_ch_a = LL_TIM_CHANNEL_CH1; break;
+                case 1: ll_ch_a = LL_TIM_CHANNEL_CH2; break;
+                default:
+                    dbg("Bad signal pin!");
+                    return E_BAD_CONFIG;
+            }
+            break;
+        case 'B':
+            switch (priv->signal_pnum) {
+                case 3: ll_ch_a = LL_TIM_CHANNEL_CH2; break;
+                default:
+                    dbg("Bad signal pin!");
+                    return E_BAD_CONFIG;
+            }
+            break;
+
+        default:
+            dbg("Bad signal pin port!");
+            return E_BAD_CONFIG;
+    }
+    const uint32_t ll_timpin_af = LL_GPIO_AF_2;
+
+    bool a_direct = true;
+    switch (ll_ch_a) {
+        case LL_TIM_CHANNEL_CH1:
+            ll_ch_b = LL_TIM_CHANNEL_CH2;
+            break;
+
+        case LL_TIM_CHANNEL_CH2:
+            ll_ch_b = LL_TIM_CHANNEL_CH1;
+            a_direct = false;
+            break;
+    }
+
+    // ---- CLAIM ----
+
+    TRY(rsc_claim_pin(unit, priv->signal_pname, priv->signal_pnum));
+    TRY(rsc_claim(unit, timRsc));
+
+    // ---- INIT ----
+    assert_param(ll_ch_a != ll_ch_b);
+
+    priv->TIMx = TIMx;
+    priv->ll_ch_a = ll_ch_a;
+    priv->ll_ch_b = ll_ch_b;
+    priv->a_direct = a_direct;
+
+    TRY(hw_configure_gpio_af(priv->signal_pname, priv->signal_pnum, ll_timpin_af));
+
+    hw_periph_clock_enable(TIMx);
+    irqd_attach(TIMx, UFCAP_TimerHandler, unit);
+
+    UFCAP_SwitchMode(unit, OPMODE_IDLE);
+
+    return E_SUCCESS;
+}
+
+/** Tear down the unit */
+void UFCAP_deInit(Unit *unit)
+{
+    struct priv *priv = unit->data;
+
+    // de-init peripherals
+    if (unit->status == E_SUCCESS ) {
+        UFCAP_SwitchMode(unit, OPMODE_IDLE);
+
+        TIM_TypeDef *TIMx = priv->TIMx;
+        LL_TIM_DeInit(TIMx);
+        irqd_attach(TIMx, UFCAP_TimerHandler, unit);
+    }
+
+    // Release all resources, deinit pins
+    rsc_teardown(unit);
+
+    // Free memory
+    free_ck(unit->data);
+}
diff --git a/units/fcap/_fcap_internal.h b/units/fcap/_fcap_internal.h
new file mode 100644
index 0000000..4c9c08d
--- /dev/null
+++ b/units/fcap/_fcap_internal.h
@@ -0,0 +1,90 @@
+//
+// Created by MightyPork on 2018/02/03.
+//
+
+#ifndef GEX_F072_FCAP_INTERNAL_H
+#define GEX_F072_FCAP_INTERNAL_H
+
+#ifndef FCAP_INTERNAL
+#error bad include!
+#endif
+
+#include "unit_base.h"
+
+enum fcap_opmode {
+    OPMODE_IDLE = 0,
+    OPMODE_BUSY = 1, // used after capture is done, before it's reported
+    OPMODE_PWM_CONT = 2,
+    OPMODE_PWM_BURST = 3, // averaging
+};
+
+/** Private data structure */
+struct priv {
+    // settings
+    char signal_pname;   // the input pin - one of TIM2 channels
+    uint8_t signal_pnum;
+
+    // internal state
+    TIM_TypeDef *TIMx;
+    uint32_t ll_ch_b;
+    uint32_t ll_ch_a;
+    bool a_direct;
+
+    enum fcap_opmode opmode;
+
+    TF_ID request_id;
+
+    union {
+        struct {
+            uint32_t ontime; // length of the captured positive pulse in the current interval
+            uint32_t last_period; //!< length of the captured interval between two rising edges
+            uint32_t last_ontime; //!< length of the last captured ontime
+        } pwm_cont;
+
+        struct {
+            uint32_t ontime; // length of the captured positive pulse in the current interval
+            uint64_t period_acu; //!< length of the captured interval between two rising edges, sum
+            uint64_t ontime_acu; //!< length of the last captured ontime, sum
+            uint16_t n_count; //!< Periods captured
+            uint16_t n_target; //!< Periods captured - requested count
+            uint8_t n_skip; //!< Periods to skip before starting the real capture
+        } pwm_burst;
+    };
+};
+
+/** Allocate data structure and set defaults */
+error_t UFCAP_preInit(Unit *unit);
+
+/** Load from a binary buffer stored in Flash */
+void UFCAP_loadBinary(Unit *unit, PayloadParser *pp);
+
+/** Write to a binary buffer for storing in Flash */
+void UFCAP_writeBinary(Unit *unit, PayloadBuilder *pb);
+
+// ------------------------------------------------------------------------
+
+/** Parse a key-value pair from the INI file */
+error_t UFCAP_loadIni(Unit *unit, const char *key, const char *value);
+
+/** Generate INI file section for the unit */
+void UFCAP_writeIni(Unit *unit, IniWriter *iw);
+
+// ------------------------------------------------------------------------
+
+/** Finalize unit set-up */
+error_t UFCAP_init(Unit *unit);
+
+/** Tear down the unit */
+void UFCAP_deInit(Unit *unit);
+
+// ------------------------------------------------------------------------
+
+void UFCAP_TimerHandler(void *arg);
+
+void UFCAP_StopMeasurement(Unit *unit);
+
+void UFCAP_ConfigureForPWMCapture(Unit *unit);
+
+void UFCAP_SwitchMode(Unit *unit, enum fcap_opmode opmode);
+
+#endif //GEX_F072_FCAP_INTERNAL_H
diff --git a/units/fcap/_fcap_settings.c b/units/fcap/_fcap_settings.c
new file mode 100644
index 0000000..de702de
--- /dev/null
+++ b/units/fcap/_fcap_settings.c
@@ -0,0 +1,62 @@
+//
+// Created by MightyPork on 2018/02/03.
+//
+
+#include "platform.h"
+#include "unit_base.h"
+
+#define FCAP_INTERNAL
+#include "_fcap_internal.h"
+
+/** Load from a binary buffer stored in Flash */
+void UFCAP_loadBinary(Unit *unit, PayloadParser *pp)
+{
+    struct priv *priv = unit->data;
+
+    uint8_t version = pp_u8(pp);
+    (void)version;
+
+    priv->signal_pname = pp_char(pp);
+    priv->signal_pnum = pp_u8(pp);
+}
+
+/** Write to a binary buffer for storing in Flash */
+void UFCAP_writeBinary(Unit *unit, PayloadBuilder *pb)
+{
+    struct priv *priv = unit->data;
+
+    pb_u8(pb, 0); // version
+
+    pb_char(pb, priv->signal_pname);
+    pb_u8(pb, priv->signal_pnum);
+}
+
+// ------------------------------------------------------------------------
+
+/** Parse a key-value pair from the INI file */
+error_t UFCAP_loadIni(Unit *unit, const char *key, const char *value)
+{
+    bool suc = true;
+    struct priv *priv = unit->data;
+
+    if (streq(key, "signal-pin")) {
+        suc = parse_pin(value, &priv->signal_pname, &priv->signal_pnum);
+    }
+    else {
+        return E_BAD_KEY;
+    }
+
+    if (!suc) return E_BAD_VALUE;
+    return E_SUCCESS;
+}
+
+/** Generate INI file section for the unit */
+void UFCAP_writeIni(Unit *unit, IniWriter *iw)
+{
+    struct priv *priv = unit->data;
+
+    iw_comment(iw, "Signal input pin");
+    iw_comment(iw, "One of: A0, A1, A5, A15, B3");
+    iw_entry(iw, "signal-pin", "%c%d", priv->signal_pname,  priv->signal_pnum);
+}
+
diff --git a/units/fcap/unit_fcap.c b/units/fcap/unit_fcap.c
new file mode 100644
index 0000000..53c62cc
--- /dev/null
+++ b/units/fcap/unit_fcap.c
@@ -0,0 +1,84 @@
+//
+// Created by MightyPork on 2017/11/25.
+//
+
+#include "unit_base.h"
+#include "unit_fcap.h"
+
+#define FCAP_INTERNAL
+#include "_fcap_internal.h"
+
+// ------------------------------------------------------------------------
+
+enum FcapCmd_ {
+    CMD_STOP = 0,
+    CMD_PWM_CONT_START = 1,
+    CMD_PWM_BURST_START = 2,
+    CMD_PWM_CONT_READ = 10,
+};
+
+/** Handle a request message */
+static error_t UFCAP_handleRequest(Unit *unit, TF_ID frame_id, uint8_t command, PayloadParser *pp)
+{
+    struct priv *priv = unit->data;
+
+    switch (command) {
+        case CMD_STOP:
+            UFCAP_SwitchMode(unit, OPMODE_IDLE);
+            return E_SUCCESS;
+
+        case CMD_PWM_CONT_START:
+            if (priv->opmode == OPMODE_PWM_CONT) return E_SUCCESS; // no-op
+            if (priv->opmode != OPMODE_IDLE) return E_BUSY;
+
+            UFCAP_SwitchMode(unit, OPMODE_PWM_CONT);
+            return E_SUCCESS;
+
+        case CMD_PWM_BURST_START:
+            if (priv->opmode != OPMODE_IDLE) return E_BAD_MODE;
+
+            uint16_t count = pp_u16(pp);
+            priv->pwm_burst.n_target = count;
+            priv->request_id = frame_id;
+            UFCAP_SwitchMode(unit, OPMODE_PWM_BURST);
+            return E_SUCCESS;
+
+        case CMD_PWM_CONT_READ:
+            if (priv->opmode != OPMODE_PWM_CONT) {
+                return E_BAD_MODE;
+            }
+            if (priv->pwm_cont.last_period == 0) {
+                return E_BUSY;
+            }
+
+            PayloadBuilder pb = pb_start(unit_tmp512, UNIT_TMP_LEN, NULL);
+            pb_u16(&pb, PLAT_AHB_MHZ);
+            pb_u32(&pb, priv->pwm_cont.last_period);
+            pb_u32(&pb, priv->pwm_cont.last_ontime);
+
+            com_respond_pb(frame_id, MSG_SUCCESS, &pb);
+            return E_SUCCESS;
+
+        default:
+            return E_UNKNOWN_COMMAND;
+    }
+}
+
+// ------------------------------------------------------------------------
+
+/** Frequency capture */
+const UnitDriver UNIT_FCAP = {
+    .name = "FCAP",
+    .description = "Frequency and pulse measurement",
+    // Settings
+    .preInit = UFCAP_preInit,
+    .cfgLoadBinary = UFCAP_loadBinary,
+    .cfgWriteBinary = UFCAP_writeBinary,
+    .cfgLoadIni = UFCAP_loadIni,
+    .cfgWriteIni = UFCAP_writeIni,
+    // Init
+    .init = UFCAP_init,
+    .deInit = UFCAP_deInit,
+    // Function
+    .handleRequest = UFCAP_handleRequest,
+};
diff --git a/units/fcap/unit_fcap.h b/units/fcap/unit_fcap.h
new file mode 100644
index 0000000..f3faf58
--- /dev/null
+++ b/units/fcap/unit_fcap.h
@@ -0,0 +1,16 @@
+//
+// Created by MightyPork on 2017/11/25.
+//
+// Digital input unit; single or multiple pin read access on one port (A-F)
+//
+
+#ifndef U_FCAP_H
+#define U_FCAP_H
+
+#include "unit.h"
+
+extern const UnitDriver UNIT_FCAP;
+
+// UU_ prototypes
+
+#endif //U_FCAP_H
diff --git a/utils/error.h b/utils/error.h
index 3b165af..54de8ce 100644
--- a/utils/error.h
+++ b/utils/error.h
@@ -28,6 +28,7 @@
     X(CHECKSUM_MISMATCH, NULL) /* bus checksum failed */ \
     X(PROTOCOL_BREACH, NULL)   /* eating with the wrong spoon */  \
     X(BUSY, NULL)              /* Unit is busy */ \
+    X(BAD_MODE, NULL)        /* Command not permissible in current opmode */ \
     \
     /* VFS user errors (those are meant to be shown to user) */ \
     X(VFS_ERROR_DURING_TRANSFER, "Error during transfer") \