diff --git a/CMakeLists.txt b/CMakeLists.txt
index b56d182..5d19deb 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -25,6 +25,7 @@ add_compile_definitions(HSE_VALUE=8000000)
 
 include_directories(
     ${PROJECT_SOURCE_DIR}/bsp
+    ${PROJECT_SOURCE_DIR}/app
     ${PROJECT_SOURCE_DIR}/lib
     ${PROJECT_SOURCE_DIR}/lib/CMSIS
     ${PROJECT_SOURCE_DIR}/lib/STM32F4xx
@@ -34,6 +35,7 @@ include_directories(
 file(GLOB_RECURSE SOURCES
         "main.c"
         "bsp/bsp.c"
+        "app/app.c"
         "system_stm32f4xx.c"
         "startup_stm32f4xx.S"
         "lib/STM32F4xx_StdPeriph_Driver/src/stm32f4xx_gpio.c"
diff --git a/app/app.c b/app/app.c
index e69de29..3a44d91 100644
--- a/app/app.c
+++ b/app/app.c
@@ -0,0 +1,30 @@
+#include "app.h"
+
+const uint16_t leds = GPIO_Pin_0 | GPIO_Pin_7 | GPIO_Pin_14;
+const uint16_t leds_arr[4] = {GPIO_Pin_0, GPIO_Pin_7, GPIO_Pin_14};
+
+void delay(uint32_t ms) {
+    ms *= 3360;
+    while(ms--) {
+        __NOP();
+    }
+}
+
+void loop() {
+    static uint32_t counter = 0;
+
+    ++counter;
+
+    GPIO_ResetBits(GPIOB, leds);
+    GPIO_SetBits(GPIOB, leds_arr[counter % 3]);
+
+    delay(250);
+}
+
+void app() {
+    
+    while(1) {
+        loop();
+    };
+}
+
diff --git a/app/app.h b/app/app.h
index e69de29..8261717 100644
--- a/app/app.h
+++ b/app/app.h
@@ -0,0 +1,7 @@
+#ifndef APP_H
+#define APP_H
+#include "bsp.h"
+
+void app();
+
+#endif
\ No newline at end of file
diff --git a/bsp/bsp.c b/bsp/bsp.c
index e69de29..4717fe1 100644
--- a/bsp/bsp.c
+++ b/bsp/bsp.c
@@ -0,0 +1,17 @@
+#include "bsp.h"
+
+const uint16_t LEDS = GPIO_Pin_0 | GPIO_Pin_7 | GPIO_Pin_14;
+const uint16_t LED[4] = {GPIO_Pin_0, GPIO_Pin_7, GPIO_Pin_14};
+
+void board_init() {
+    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
+    GPIO_InitTypeDef gpio;
+    GPIO_StructInit(&gpio);
+    gpio.GPIO_Mode = GPIO_Mode_OUT;
+    gpio.GPIO_Pin = LEDS;
+    GPIO_Init(GPIOB, &gpio);
+
+    GPIO_SetBits(GPIOB, LEDS);
+}
+
+
diff --git a/bsp/bsp.h b/bsp/bsp.h
index 68cff2b..5bbfbca 100644
--- a/bsp/bsp.h
+++ b/bsp/bsp.h
@@ -1,12 +1,11 @@
+#ifndef BSP_H
+#define BSP_H
+
 #include "stm32f4xx.h"
 #include "stm32f4xx_gpio.h"
 #include "stm32f4xx_rcc.h"
 #include "stm32f4xx_usart.h"
 
-const uint16_t LEDS = GPIO_Pin_0 | GPIO_Pin_7 | GPIO_Pin_14;
-const uint16_t LED[4] = {GPIO_Pin_0, GPIO_Pin_7, GPIO_Pin_14};
+void board_init();
 
-void init();
-void loop();
-
-void delay();
+#endif
diff --git a/main.c b/main.c
index 3bf8140..68937e3 100644
--- a/main.c
+++ b/main.c
@@ -1,38 +1,13 @@
 #include "bsp.h"
+#include "app.h"
+
 
 int main() {
-    init();
-
-    do {
-        loop();
-    } while (1);
+    board_init();
+    app();
 }
 
-void init() {
-    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
-    GPIO_InitTypeDef gpio;
-    GPIO_StructInit(&gpio);
-    gpio.GPIO_Mode = GPIO_Mode_OUT;
-    gpio.GPIO_Pin = LEDS;
-    GPIO_Init(GPIOB, &gpio);
 
-    GPIO_SetBits(GPIOB, LEDS);
-}
 
-void loop() {
-    static uint32_t counter = 0;
 
-    ++counter;
 
-    GPIO_ResetBits(GPIOB, LEDS);
-    GPIO_SetBits(GPIOB, LED[counter % 3]);
-
-    delay(250);
-}
-
-void delay(uint32_t ms) {
-    ms *= 3360;
-    while(ms--) {
-        __NOP();
-    }
-}