diff --git a/fw/Core/Inc/led.h b/fw/Core/Inc/led.h
index 5ddc918..8cbb403 100644
--- a/fw/Core/Inc/led.h
+++ b/fw/Core/Inc/led.h
@@ -9,7 +9,6 @@
 #define INC_LED_H_
 
 #include "stdint.h"
-#include "stm32l0xx_hal.h"
 #include "stm32l0xx_ll_gpio.h"
 
 /*
diff --git a/fw/Core/Src/led.c b/fw/Core/Src/led.c
index 051da44..7914e04 100644
--- a/fw/Core/Src/led.c
+++ b/fw/Core/Src/led.c
@@ -7,6 +7,11 @@
 
 #include "led.h"
 
+/*
+ * Definitions
+ */
+#define NULL 0
+
 /*
  * Global variables
  */
diff --git a/fw/Core/Src/main.c b/fw/Core/Src/main.c
index 8a499a2..879628a 100644
--- a/fw/Core/Src/main.c
+++ b/fw/Core/Src/main.c
@@ -107,7 +107,7 @@ int main(void)
   led_context.green_led_pin = LED_G_Pin;
   led_context.blue_led_pin = LED_B_Pin;
   led_init(&led_context, 50, 1000);
-  led_set_color(0, 20, 0);
+  led_set_color(80, 0, 0);
   /* USER CODE END 2 */
 
   /* Infinite loop */
@@ -115,6 +115,7 @@ int main(void)
   while (1)
   {
     /* USER CODE END WHILE */
+	led_pwm_handler(); // TODO temporary, should be placed in timer interrupt (SysTick)
     /* USER CODE BEGIN 3 */
   }
   /* USER CODE END 3 */
diff --git a/fw/Core/Src/stm32l0xx_it.c b/fw/Core/Src/stm32l0xx_it.c
index 063906f..9009e6d 100644
--- a/fw/Core/Src/stm32l0xx_it.c
+++ b/fw/Core/Src/stm32l0xx_it.c
@@ -131,7 +131,7 @@ void SysTick_Handler(void)
   /* USER CODE END SysTick_IRQn 0 */
 
   /* USER CODE BEGIN SysTick_IRQn 1 */
-  led_pwm_handler();
+//  led_pwm_handler();
   /* USER CODE END SysTick_IRQn 1 */
 }