diff --git a/left/src/main.c b/left/src/main.c
index 6189119..6d31a7a 100644
--- a/left/src/main.c
+++ b/left/src/main.c
@@ -2,16 +2,7 @@
 #include "init_clock.h"
 #include "fsl_port.h"
 #include "key_matrix.h"
-
-#define TEST_LED_GPIO  GPIOA
-#define TEST_LED_PORT  PORTA
-#define TEST_LED_CLOCK kCLOCK_PortA
-#define TEST_LED_PIN   12
-
-#define TEST_LED_INIT(output) GPIO_PinInit(TEST_LED_GPIO, TEST_LED_PIN, \
-                                          &(gpio_pin_config_t){kGPIO_DigitalOutput, (output)})
-#define TEST_LED_ON() GPIO_ClearPinsOutput(TEST_LED_GPIO, 1U << TEST_LED_PIN)
-#define TEST_LED_OFF() GPIO_SetPinsOutput(TEST_LED_GPIO, 1U << TEST_LED_PIN)
+#include "test_led.h"
 
 #define KEYBOARD_MATRIX_COLS_NUM 7
 #define KEYBOARD_MATRIX_ROWS_NUM 5
@@ -39,9 +30,7 @@ key_matrix_t keyMatrix = {
 
 int main(void)
 {
-    CLOCK_EnableClock(TEST_LED_CLOCK);
-    PORT_SetPinMux(TEST_LED_PORT, TEST_LED_PIN, kPORT_MuxAsGpio);
-    TEST_LED_INIT(1);
+    InitTestLed();
     InitClock();
 
     KeyMatrix_Init(&keyMatrix);
diff --git a/left/src/test_led.c b/left/src/test_led.c
new file mode 100644
index 0000000..8f536ff
--- /dev/null
+++ b/left/src/test_led.c
@@ -0,0 +1,9 @@
+#include "test_led.h"
+#include "fsl_port.h"
+
+extern void InitTestLed()
+{
+    CLOCK_EnableClock(TEST_LED_CLOCK);
+    PORT_SetPinMux(TEST_LED_PORT, TEST_LED_PIN, kPORT_MuxAsGpio);
+    GPIO_PinInit(TEST_LED_GPIO, TEST_LED_PIN, &(gpio_pin_config_t){kGPIO_DigitalOutput, 0});
+}
diff --git a/left/src/test_led.h b/left/src/test_led.h
new file mode 100644
index 0000000..dd5f024
--- /dev/null
+++ b/left/src/test_led.h
@@ -0,0 +1,26 @@
+#ifndef __TEST_LED_H__
+#define __TEST_LED_H__
+
+// Includes:
+
+    #include "fsl_gpio.h"
+
+// Macros:
+
+    #define LOGIC_LED_ON  0U
+    #define LOGIC_LED_OFF 1U
+
+    #define TEST_LED_GPIO      GPIOA
+    #define TEST_LED_PORT PORTA
+    #define TEST_LED_CLOCK     kCLOCK_PortA
+    #define TEST_LED_PIN  12
+
+    #define TEST_LED_ON() GPIO_ClearPinsOutput(TEST_LED_GPIO, 1U << TEST_LED_PIN)
+    #define TEST_LED_OFF() GPIO_SetPinsOutput(TEST_LED_GPIO, 1U << TEST_LED_PIN)
+    #define TEST_LED_TOGGLE() GPIO_TogglePinsOutput(TEST_LED_GPIO, 1U << TEST_LED_GPIO_PIN)
+
+// Functions:
+
+    extern void InitTestLed();
+
+#endif