diff --git a/.idea/jakub.iml b/.idea/jakub.iml
index 4c94235..f08604b 100644
--- a/.idea/jakub.iml
+++ b/.idea/jakub.iml
@@ -1,2 +1,2 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<module classpath="CIDR" type="CPP_MODULE" version="4" />
\ No newline at end of file
+<module classpath="CMake" type="CPP_MODULE" version="4" />
\ No newline at end of file
diff --git a/Core/Inc/main.h b/Core/Inc/main.h
index a3e264c..ae4578c 100644
--- a/Core/Inc/main.h
+++ b/Core/Inc/main.h
@@ -57,6 +57,9 @@ void Error_Handler(void);
 /* USER CODE END EFP */
 
 /* Private defines -----------------------------------------------------------*/
+#define PIN_Pin GPIO_PIN_1
+#define PIN_GPIO_Port GPIOA
+#define PIN_EXTI_IRQn EXTI1_IRQn
 
 /* USER CODE BEGIN Private defines */
 
diff --git a/Core/Inc/stm32g4xx_it.h b/Core/Inc/stm32g4xx_it.h
index 389f3a0..39870db 100644
--- a/Core/Inc/stm32g4xx_it.h
+++ b/Core/Inc/stm32g4xx_it.h
@@ -55,6 +55,7 @@ void SVC_Handler(void);
 void DebugMon_Handler(void);
 void PendSV_Handler(void);
 void SysTick_Handler(void);
+void EXTI1_IRQHandler(void);
 void USB_LP_IRQHandler(void);
 void TIM1_UP_TIM16_IRQHandler(void);
 /* USER CODE BEGIN EFP */
diff --git a/Core/Src/main.c b/Core/Src/main.c
index 0795d95..9b6836e 100644
--- a/Core/Src/main.c
+++ b/Core/Src/main.c
@@ -66,11 +66,7 @@ int _write(int file, char *ptr, int len) {
 
 void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
 {
-    uint32_t current_count = EXT_TIMER.Instance->CNT;
-    uint32_t difference = current_count-last_count;
 
-    last_count = current_count;
-    printf("%d\n", difference);
 }
 
 void USB_CDC_RxHandler(uint8_t* Buf, uint32_t Len)
@@ -85,6 +81,34 @@ void USB_CDC_RxHandler(uint8_t* Buf, uint32_t Len)
 
 }
 
+uint32_t check_pin_state()
+{
+    return  HAL_GPIO_ReadPin(PIN_GPIO_Port, PIN_Pin);
+}
+
+void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
+{
+    uint32_t current_count = EXT_TIMER.Instance->CNT;
+
+    if (check_pin_state() )
+  {
+//      printf("RISING\n");
+        //Reset
+        last_count = current_count;
+
+  }
+  else
+  {
+//      printf("FALLING\n");
+        //Send
+        uint32_t difference = current_count-last_count;
+
+
+        printf("%d\n", difference);
+  }
+
+}
+
 void receive_handler();
 /* USER CODE END PFP */
 
@@ -295,6 +319,7 @@ static void MX_TIM2_Init(void)
   */
 static void MX_GPIO_Init(void)
 {
+  GPIO_InitTypeDef GPIO_InitStruct = {0};
 /* USER CODE BEGIN MX_GPIO_Init_1 */
 /* USER CODE END MX_GPIO_Init_1 */
 
@@ -302,6 +327,16 @@ static void MX_GPIO_Init(void)
   __HAL_RCC_GPIOF_CLK_ENABLE();
   __HAL_RCC_GPIOA_CLK_ENABLE();
 
+  /*Configure GPIO pin : PIN_Pin */
+  GPIO_InitStruct.Pin = PIN_Pin;
+  GPIO_InitStruct.Mode = GPIO_MODE_IT_RISING_FALLING;
+  GPIO_InitStruct.Pull = GPIO_PULLUP;
+  HAL_GPIO_Init(PIN_GPIO_Port, &GPIO_InitStruct);
+
+  /* EXTI interrupt init*/
+  HAL_NVIC_SetPriority(EXTI1_IRQn, 0, 0);
+  HAL_NVIC_EnableIRQ(EXTI1_IRQn);
+
 /* USER CODE BEGIN MX_GPIO_Init_2 */
 /* USER CODE END MX_GPIO_Init_2 */
 }
diff --git a/Core/Src/stm32g4xx_it.c b/Core/Src/stm32g4xx_it.c
index abf8a51..d11a1c8 100644
--- a/Core/Src/stm32g4xx_it.c
+++ b/Core/Src/stm32g4xx_it.c
@@ -199,6 +199,20 @@ void SysTick_Handler(void)
 /* please refer to the startup file (startup_stm32g4xx.s).                    */
 /******************************************************************************/
 
+/**
+  * @brief This function handles EXTI line1 interrupt.
+  */
+void EXTI1_IRQHandler(void)
+{
+  /* USER CODE BEGIN EXTI1_IRQn 0 */
+
+  /* USER CODE END EXTI1_IRQn 0 */
+  HAL_GPIO_EXTI_IRQHandler(PIN_Pin);
+  /* USER CODE BEGIN EXTI1_IRQn 1 */
+
+  /* USER CODE END EXTI1_IRQn 1 */
+}
+
 /**
   * @brief This function handles USB low priority interrupt remap.
   */
diff --git a/jakub.ioc b/jakub.ioc
index c7d7b48..eeee826 100644
--- a/jakub.ioc
+++ b/jakub.ioc
@@ -20,13 +20,14 @@ Mcu.Package=LQFP64
 Mcu.Pin0=PF0-OSC_IN
 Mcu.Pin1=PF1-OSC_OUT
 Mcu.Pin2=PA0
-Mcu.Pin3=PA11
-Mcu.Pin4=PA12
-Mcu.Pin5=VP_SYS_VS_Systick
-Mcu.Pin6=VP_SYS_VS_DBSignals
-Mcu.Pin7=VP_TIM1_VS_ClockSourceINT
-Mcu.Pin8=VP_USB_DEVICE_VS_USB_DEVICE_CDC_FS
-Mcu.PinsNb=9
+Mcu.Pin3=PA1
+Mcu.Pin4=PA11
+Mcu.Pin5=PA12
+Mcu.Pin6=VP_SYS_VS_Systick
+Mcu.Pin7=VP_SYS_VS_DBSignals
+Mcu.Pin8=VP_TIM1_VS_ClockSourceINT
+Mcu.Pin9=VP_USB_DEVICE_VS_USB_DEVICE_CDC_FS
+Mcu.PinsNb=10
 Mcu.ThirdPartyNb=0
 Mcu.UserConstants=
 Mcu.UserName=STM32G474RETx
@@ -34,6 +35,7 @@ MxCube.Version=6.9.1
 MxDb.Version=DB.6.0.91
 NVIC.BusFault_IRQn=true\:0\:0\:false\:false\:true\:false\:false\:false
 NVIC.DebugMonitor_IRQn=true\:0\:0\:false\:false\:true\:false\:false\:false
+NVIC.EXTI1_IRQn=true\:0\:0\:false\:false\:true\:true\:true\:true
 NVIC.ForceEnableDMAVector=true
 NVIC.HardFault_IRQn=true\:0\:0\:false\:false\:true\:false\:false\:false
 NVIC.MemoryManagement_IRQn=true\:0\:0\:false\:false\:true\:false\:false\:false
@@ -47,6 +49,12 @@ NVIC.USB_LP_IRQn=true\:2\:0\:true\:false\:true\:false\:true\:true
 NVIC.UsageFault_IRQn=true\:0\:0\:false\:false\:true\:false\:false\:false
 PA0.Locked=true
 PA0.Signal=S_TIM2_ETR
+PA1.GPIOParameters=GPIO_PuPd,GPIO_Label,GPIO_ModeDefaultEXTI
+PA1.GPIO_Label=PIN
+PA1.GPIO_ModeDefaultEXTI=GPIO_MODE_IT_RISING_FALLING
+PA1.GPIO_PuPd=GPIO_PULLUP
+PA1.Locked=true
+PA1.Signal=GPXTI1
 PA11.Mode=Device
 PA11.Signal=USB_DM
 PA12.Mode=Device
@@ -139,6 +147,8 @@ RCC.USART3Freq_Value=150000000
 RCC.USBFreq_Value=48000000
 RCC.VCOInputFreq_Value=12500000
 RCC.VCOOutputFreq_Value=300000000
+SH.GPXTI1.0=GPIO_EXTI1
+SH.GPXTI1.ConfNb=1
 SH.S_TIM2_ETR.0=TIM2_ETR,ClockSourceETR_Mode2
 SH.S_TIM2_ETR.ConfNb=1
 TIM1.ClockDivision=TIM_CLOCKDIVISION_DIV1