diff --git a/Makefile.mak b/Makefile.mak
index b5ff5524a..dc856ffc6 100644
--- a/Makefile.mak
+++ b/Makefile.mak
@@ -150,7 +150,7 @@ DEFINES_JERRY = -DMEM_HEAP_CHUNK_SIZE=256 -DMEM_HEAP_AREA_SIZE=32768 -DMEM_STATS
 SOURCES_JERRY = \
  $(sort \
  $(wildcard ./src/libruntime/*.c) \
- $(wildcard ./src/libperipherals/actuators.c) \
+ $(wildcard ./src/libperipherals/*.c) \
  $(wildcard ./src/libjsparser/*.c) \
  $(wildcard ./src/libecmaobjects/*.c) \
  $(wildcard ./src/libecmaoperations/*.c) \
diff --git a/src/libperipherals/actuators.c b/src/libperipherals/actuators.c
index bd66af889..de0a29593 100644
--- a/src/libperipherals/actuators.c
+++ b/src/libperipherals/actuators.c
@@ -13,38 +13,66 @@
  * limitations under the License.
  */
 
+#ifdef __TARGET_MCU
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wpedantic"
 #pragma GCC diagnostic ignored "-Wsign-conversion"
-#ifdef __TARGET_MCU
 #include "stm32f4xx.h"
 #include "stm32f4xx_gpio.h"
 #include "stm32f4xx_rcc.h"
-#endif
 #pragma GCC diagnostic pop
+#endif
 
 #include "actuators.h"
 #include "jerry-libc.h"
 
+void
+led_toggle (uint32_t led_id)
+{
+  __printf ("led_toggle: %d\n", led_id);
+}
+
+void
+led_on (uint32_t led_id)
+{
+  __printf ("led_on: %d\n", led_id);
+}
+
+void
+led_off (uint32_t led_id)
+{
+  __printf ("led_off: %d\n", led_id);
+}
+
+void
+led_blink_once (uint32_t led_id)
+{
+#ifdef __HOST
+  __printf ("led_blink_once: %d\n", led_id);
+#endif
+
+#ifdef __TARGET_MCU
+  blink_once (led_id);
+#endif
+}
+
 #ifdef __TARGET_MCU
 
 void
 blink_once (uint32_t led)
 {
   uint32_t pin = led;
-  uint32_t mode = (uint32_t)GPIO_Mode_OUT << (pin * 2);
-  uint32_t speed = (uint32_t)GPIO_Speed_100MHz << (pin * 2);
-  uint32_t type = (uint32_t)GPIO_OType_PP << pin;
-  uint32_t pullup = (uint32_t)GPIO_PuPd_NOPULL << (pin * 2);
-  
+  uint32_t mode = (uint32_t) GPIO_Mode_OUT << (pin * 2);
+  uint32_t speed = (uint32_t) GPIO_Speed_100MHz << (pin * 2);
+  uint32_t type = (uint32_t) GPIO_OType_PP << pin;
+  uint32_t pullup = (uint32_t) GPIO_PuPd_NOPULL << (pin * 2);
+
   TODO (INITIALIZE ONCE);
-  //
+
   //  Initialise the peripheral clock.
-  //
   RCC->AHB1ENR |= RCC_AHB1Periph_GPIOD;
-  //
+
   //  Initilaise the GPIO port.
-  //
   volatile GPIO_TypeDef* gpio = GPIOD;
 
   gpio->MODER |= mode;
@@ -54,44 +82,27 @@ blink_once (uint32_t led)
   //
   //  Toggle the selected LED indefinitely.
   //
-  int index;
-  
+  volatile int index;
+
   int dot = 600000;
   int dash = dot * 3;
-  
+
   while (1)
   {
-    gpio->BSRRL = (uint16_t) (1 << pin); for (index = 0; index < dot; index++); gpio->BSRRH = (uint16_t) (1 << pin); for (index = 0; index < dash; index++);
-    gpio->BSRRL = (uint16_t) (1 << pin); for (index = 0; index < dot; index++); gpio->BSRRH = (uint16_t) (1 << pin); for (index = 0; index < dash; index++);
-    gpio->BSRRL = (uint16_t) (1 << pin); for (index = 0; index < dot; index++); gpio->BSRRH = (uint16_t) (1 << pin); for (index = 0; index < dash; index++);
+    gpio->BSRRL = (uint16_t) (1 << pin);
+    for (index = 0; index < dot; index++);
+    gpio->BSRRH = (uint16_t) (1 << pin);
+    for (index = 0; index < dash; index++);
+    gpio->BSRRL = (uint16_t) (1 << pin);
+    for (index = 0; index < dot; index++);
+    gpio->BSRRH = (uint16_t) (1 << pin);
+    for (index = 0; index < dash; index++);
+    gpio->BSRRL = (uint16_t) (1 << pin);
+    for (index = 0; index < dot; index++);
+    gpio->BSRRH = (uint16_t) (1 << pin);
+    for (index = 0; index < dash; index++);
 
     for (index = 0; index < dash * 7; index++);
   }
 }
-#endif
-
-void led_toggle(uint32_t led_id)
-{
-  __printf("led_toggle: %d\n", led_id);
-}
-
-void led_on(uint32_t led_id)
-{
-  __printf("led_on: %d\n", led_id);
-}
-
-void led_off(uint32_t led_id)
-{
-  __printf("led_off: %d\n", led_id);
-}
-
-void led_blink_once(uint32_t led_id)
-{
-#ifdef __HOST
-  __printf("led_blink_once: %d\n", led_id);
-#endif
-
-#ifdef __TARGET_MCU
-  blink_once(led_id);
-#endif
-}
+#endif
\ No newline at end of file
diff --git a/src/libperipherals/actuators.h b/src/libperipherals/actuators.h
index 5700e00d6..e5532ce6d 100644
--- a/src/libperipherals/actuators.h
+++ b/src/libperipherals/actuators.h
@@ -18,17 +18,14 @@
 
 #include "globals.h"
 
-// STM32 F4
-#define LED_GREEN      12
-#define LED_ORANGE     13
-#define LED_RED        14
-#define LED_BLUE       15
-
 void led_toggle(uint32_t);
 void led_on(uint32_t);
 void led_off(uint32_t);
 void led_blink_once(uint32_t);
+
+#ifdef __TARGET_MCU
 void blink_once (uint32_t);
+#endif
 
 #endif	/* ACTUATORS_H */
 
diff --git a/src/libperipherals/common-io.c b/src/libperipherals/common-io.c
index 609246d9a..410d560b0 100644
--- a/src/libperipherals/common-io.c
+++ b/src/libperipherals/common-io.c
@@ -13,4 +13,121 @@
  * limitations under the License.
  */
 
+#ifdef __TARGET_MCU
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wpedantic"
+#pragma GCC diagnostic ignored "-Wsign-conversion"
+#include "stm32f4xx.h"
+#include "stm32f4xx_gpio.h"
+#include "stm32f4xx_rcc.h"
+#pragma GCC diagnostic pop
 
+#ifdef __HOST
+#include <time.h>
+#endif
+
+// STM32 F4
+#define LED_GREEN      12
+#define LED_ORANGE     13
+#define LED_RED        14
+#define LED_BLUE       15
+
+#endif
+
+#include "common-io.h"
+#include "jerry-libc.h"
+
+int
+digital_read (uint32_t arg1 __unused, uint32_t arg2 __unused)
+{
+  JERRY_UNIMPLEMENTED ();
+}
+
+void
+digital_write (uint32_t arg1 __unused, uint32_t arg2 __unused)
+{
+  JERRY_UNIMPLEMENTED ();
+}
+
+int
+analog_read (uint32_t arg1 __unused, uint32_t arg2 __unused)
+{
+  JERRY_UNIMPLEMENTED ();
+}
+
+void
+analog_write (uint32_t arg1 __unused, uint32_t arg2 __unused)
+{
+  JERRY_UNIMPLEMENTED ();
+}
+
+void
+wait_ms (uint32_t time_ms)
+{
+#ifdef __HOST
+  // 1 millisecond = 1,000,000 Nanoseconds
+#define NANO_SECOND_MULTIPLIER  1000000
+  __printf ("wait_ms: %d\n", time_ms);
+  //  const long interval_ms = time_ms * NANO_SECOND_MULTIPLIER;
+  //
+  //  timespec sleep_value = {0};
+  //  sleep_value.tv_nsec = interval_ms;
+  //  nanosleep (&sleep_value, NULL);
+#endif
+
+#ifdef __TARGET_MCU
+  volatile uint32_t index;
+  for (index = 0; index < time_ms; index++);
+#endif
+}
+
+#ifdef __TARGET_MCU
+void
+fake_exit (void)
+{
+  uint32_t pin = LED_ORANGE;
+  uint32_t mode = (uint32_t)GPIO_Mode_OUT << (pin * 2);
+  uint32_t speed = (uint32_t)GPIO_Speed_100MHz << (pin * 2);
+  uint32_t type = (uint32_t)GPIO_OType_PP << pin;
+  uint32_t pullup = (uint32_t)GPIO_PuPd_NOPULL << (pin * 2);
+  //
+  //  Initialise the peripheral clock.
+  //
+  RCC->AHB1ENR |= RCC_AHB1Periph_GPIOD;
+  //
+  //  Initilaise the GPIO port.
+  //
+  volatile GPIO_TypeDef* gpio = GPIOD;
+
+  gpio->MODER |= mode;
+  gpio->OSPEEDR |= speed;
+  gpio->OTYPER |= type;
+  gpio->PUPDR |= pullup;
+  //
+  //  Toggle the selected LED indefinitely.
+  //
+  volatile int index;
+  
+  // SOS
+  
+  int dot = 600000;
+  int dash = dot * 3;
+  
+  while (1)
+  {
+    gpio->BSRRL = (uint16_t) (1 << pin); for (index = 0; index < dot; index++); gpio->BSRRH = (uint16_t) (1 << pin); for (index = 0; index < dash; index++);
+    gpio->BSRRL = (uint16_t) (1 << pin); for (index = 0; index < dot; index++); gpio->BSRRH = (uint16_t) (1 << pin); for (index = 0; index < dash; index++);
+    gpio->BSRRL = (uint16_t) (1 << pin); for (index = 0; index < dot; index++); gpio->BSRRH = (uint16_t) (1 << pin); for (index = 0; index < dash; index++);
+    
+    gpio->BSRRL = (uint16_t) (1 << pin); for (index = 0; index < dash; index++); gpio->BSRRH = (uint16_t) (1 << pin); for (index = 0; index < dash; index++);
+    gpio->BSRRL = (uint16_t) (1 << pin); for (index = 0; index < dash; index++); gpio->BSRRH = (uint16_t) (1 << pin); for (index = 0; index < dash; index++);
+    gpio->BSRRL = (uint16_t) (1 << pin); for (index = 0; index < dash; index++); gpio->BSRRH = (uint16_t) (1 << pin); for (index = 0; index < dash; index++);
+    
+    gpio->BSRRL = (uint16_t) (1 << pin); for (index = 0; index < dot; index++); gpio->BSRRH = (uint16_t) (1 << pin); for (index = 0; index < dash; index++);
+    gpio->BSRRL = (uint16_t) (1 << pin); for (index = 0; index < dot; index++); gpio->BSRRH = (uint16_t) (1 << pin); for (index = 0; index < dash; index++);
+    gpio->BSRRL = (uint16_t) (1 << pin); for (index = 0; index < dot; index++); gpio->BSRRH = (uint16_t) (1 << pin);
+    
+    for (index = 0; index < dash * 7; index++);
+  }
+}
+#endif
diff --git a/src/libperipherals/common-io.h b/src/libperipherals/common-io.h
index b5da0692b..09f532b66 100644
--- a/src/libperipherals/common-io.h
+++ b/src/libperipherals/common-io.h
@@ -16,11 +16,20 @@
 #ifndef COMMON_IO_H
 #define	COMMON_IO_H
 
-int digital_read(int, int);
-void digital_write(int, int);
+#include "globals.h"
 
-int analog_read(int, int);
-void analog_write(int, int);
+int digital_read(uint32_t, uint32_t);
+void digital_write(uint32_t, uint32_t);
+
+int analog_read(uint32_t, uint32_t);
+void analog_write(uint32_t, uint32_t);
+    
+void wait_ms(uint32_t);
+
+
+#ifdef __TARGET_MCU
+void fake_exit(void);
+#endif
 
 #endif	/* COMMON_IO_H */
 
diff --git a/src/libperipherals/sensors.c b/src/libperipherals/sensors.c
index 609246d9a..1f5ea2f0d 100644
--- a/src/libperipherals/sensors.c
+++ b/src/libperipherals/sensors.c
@@ -13,4 +13,4 @@
  * limitations under the License.
  */
 
-
+#include "sensors.h"
\ No newline at end of file
diff --git a/src/libperipherals/sensors.h b/src/libperipherals/sensors.h
index 4240aea74..3b6f5a45f 100644
--- a/src/libperipherals/sensors.h
+++ b/src/libperipherals/sensors.h
@@ -16,6 +16,7 @@
 #ifndef SENSORS_H
 #define	SENSORS_H
 
+#include "globals.h"
 
 #endif	/* SENSORS_H */
 
diff --git a/src/main.c b/src/main.c
index 4fc3c6b52..b8ef72849 100644
--- a/src/main.c
+++ b/src/main.c
@@ -14,19 +14,7 @@
  */
 
 #ifdef __TARGET_MCU
-
-#pragma GCC diagnostic push
-#pragma GCC diagnostic ignored "-Wpedantic"
-#pragma GCC diagnostic ignored "-Wsign-conversion"
-#include "stm32f4xx.h"
-#include "stm32f4xx_gpio.h"
-#include "stm32f4xx_rcc.h"
-#pragma GCC diagnostic pop
-
-#define LED_GREEN      12
-#define LED_ORANGE     13
-#define LED_RED        14
-#define LED_BLUE       15
+#include "common-io.h"
 #include "generated.h"
 #endif
 
@@ -158,64 +146,12 @@ main (int argc __unused,
 
   return 0;
 }
-#elif !defined(__HOST) && defined(__TARGET_MCU)
-void fake_exit(void);
-
-void
-fake_exit (void)
-{
-  uint32_t pin = LED_ORANGE;
-  uint32_t mode = (uint32_t)GPIO_Mode_OUT << (pin * 2);
-  uint32_t speed = (uint32_t)GPIO_Speed_100MHz << (pin * 2);
-  uint32_t type = (uint32_t)GPIO_OType_PP << pin;
-  uint32_t pullup = (uint32_t)GPIO_PuPd_NOPULL << (pin * 2);
-  //
-  //  Initialise the peripheral clock.
-  //
-  RCC->AHB1ENR |= RCC_AHB1Periph_GPIOD;
-  //
-  //  Initilaise the GPIO port.
-  //
-  volatile GPIO_TypeDef* gpio = GPIOD;
-
-  gpio->MODER |= mode;
-  gpio->OSPEEDR |= speed;
-  gpio->OTYPER |= type;
-  gpio->PUPDR |= pullup;
-  //
-  //  Toggle the selected LED indefinitely.
-  //
-  volatile int index;
-  
-  // SOS
-  
-  int dot = 600000;
-  int dash = dot * 3;
-  
-  while (1)
-  {
-    gpio->BSRRL = (uint16_t) (1 << pin); for (index = 0; index < dot; index++); gpio->BSRRH = (uint16_t) (1 << pin); for (index = 0; index < dash; index++);
-    gpio->BSRRL = (uint16_t) (1 << pin); for (index = 0; index < dot; index++); gpio->BSRRH = (uint16_t) (1 << pin); for (index = 0; index < dash; index++);
-    gpio->BSRRL = (uint16_t) (1 << pin); for (index = 0; index < dot; index++); gpio->BSRRH = (uint16_t) (1 << pin); for (index = 0; index < dash; index++);
-    
-    gpio->BSRRL = (uint16_t) (1 << pin); for (index = 0; index < dash; index++); gpio->BSRRH = (uint16_t) (1 << pin); for (index = 0; index < dash; index++);
-    gpio->BSRRL = (uint16_t) (1 << pin); for (index = 0; index < dash; index++); gpio->BSRRH = (uint16_t) (1 << pin); for (index = 0; index < dash; index++);
-    gpio->BSRRL = (uint16_t) (1 << pin); for (index = 0; index < dash; index++); gpio->BSRRH = (uint16_t) (1 << pin); for (index = 0; index < dash; index++);
-    
-    gpio->BSRRL = (uint16_t) (1 << pin); for (index = 0; index < dot; index++); gpio->BSRRH = (uint16_t) (1 << pin); for (index = 0; index < dash; index++);
-    gpio->BSRRL = (uint16_t) (1 << pin); for (index = 0; index < dot; index++); gpio->BSRRH = (uint16_t) (1 << pin); for (index = 0; index < dash; index++);
-    gpio->BSRRL = (uint16_t) (1 << pin); for (index = 0; index < dot; index++); gpio->BSRRH = (uint16_t) (1 << pin);
-    
-    for (index = 0; index < dash * 7; index++);
-  }
-}
+#endif
 
+#ifdef __TARGET_MCU
 int
 main(void)
 {
-  
-  //fake_exit();
-  
   const char *source_p = generated_source;
   const size_t source_size = sizeof(generated_source);
 
@@ -226,6 +162,4 @@ main(void)
 
   JERRY_UNREACHABLE();
 }
-#else /* !__HOST && !__TARGET_MCU */
-# error "!__HOST && !__TARGET_MCU"
-#endif /* !__HOST && !__TARGET_MCU */
+#endif