diff --git a/Lab4/Src/twoleds.c~ b/Lab4/Src/twoleds.c~
deleted file mode 100644
index 04179a4565f4b70b7e36170ecfd99600374bda59..0000000000000000000000000000000000000000
--- a/Lab4/Src/twoleds.c~
+++ /dev/null
@@ -1,197 +0,0 @@
-/**
-  ******************************************************************************
-  * @file    BSP/Src/main.c 
-  * @author  MCD Application Team
-  * @brief   Main program body
-  ******************************************************************************
-
-  * @brief  Main program
-  * @param  None
-  * @retval None
-  */
-
-#include "main.h"
-#include <stdio.h>
-#include <string.h>
-
-struct led {
-  char ledname[5];
-  GPIO_TypeDef* port;
-  char portname;
-  uint32_t pin;
-};
-
-
-//declaration for the GPIO pins for the LED
-
-#define LED2_PIN                         GPIO_PIN_14
-#define LED2_GPIO_PORT                   GPIOB
-#define LED2_GPIO_CLK_ENABLE()           __HAL_RCC_GPIOB_CLK_ENABLE()
-#define LED2_GPIO_CLK_DISABLE()          __HAL_RCC_GPIOB_CLK_DISABLE()
-
-#define LED1_PIN                         GPIO_PIN_5
-#define LED1_GPIO_PORT                   GPIOA
-#define LED1_GPIO_CLK_ENABLE()           __HAL_RCC_GPIOA_CLK_ENABLE()   
-#define LED1_GPIO_CLK_DISABLE()          __HAL_RCC_GPIOA_CLK_DISABLE()
-
-/* Private function prototypes -----------------------------------------------*/
-static void SystemClock_Config(void);
-void LED2_Init(struct led);
-void LED2_On(struct led);
-void LED2_Off(struct led);
-void LED2_DeInit(struct led);
-void LED2_Toggle(struct led);
-
-
-int main(void)
-{
-/* STM32L4xx HAL library initialization:
-       - Configure the Flash prefetch, Flash preread and Buffer caches
-       - Systick timer is configured by default as source of time base, but user 
-             can eventually implement his proper time base source (a general purpose 
-             timer for example or other time source), keeping in mind that Time base 
-             duration should be kept 1ms since PPP_TIMEOUT_VALUEs are defined and 
-             handled in milliseconds basis.
-       - Low Level Initialization
-     */
-  struct led myleds[2];
-
-  HAL_Init();
-
-  /* Configure the System clock to have a frequency of 80 MHz */
-  SystemClock_Config();
-
-  strcpy(myleds[1].ledname, "LED1");
-  myleds[1].port=LED1_GPIO_PORT;
-  myleds[1].pin=LED1_PIN;
-  myleds[1] .portname='A';
-
-  /* Configure the User LED */
-
-  LED2_Init(myleds[1]);
-  /* turn the LED on */
-  LED2_On(myleds[1]);
-
-    /* loop for ever */
-    while (1)
-      {
-	LED2_On(myleds[1]);
-	HAL_Delay(1000);  //delay for 1000 milliseconds - namely 1 second
-	LED2_Off(myleds[1]);
-	HAL_Delay(1000);  //delay for 1000 milliseconds - namely 1 second
-      }
-
-}
-
-static void SystemClock_Config(void)
-{
-  RCC_ClkInitTypeDef RCC_ClkInitStruct;
-  RCC_OscInitTypeDef RCC_OscInitStruct;
-
-  /* MSI is enabled after System reset, activate PLL with MSI as source */
-  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_MSI;
-  RCC_OscInitStruct.MSIState = RCC_MSI_ON;
-  RCC_OscInitStruct.MSIClockRange = RCC_MSIRANGE_6;
-  RCC_OscInitStruct.MSICalibrationValue = RCC_MSICALIBRATION_DEFAULT;
-  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
-  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_MSI;
-  RCC_OscInitStruct.PLL.PLLM = 1;
-  RCC_OscInitStruct.PLL.PLLN = 40;
-  RCC_OscInitStruct.PLL.PLLR = 2;
-  RCC_OscInitStruct.PLL.PLLP = 7;
-  RCC_OscInitStruct.PLL.PLLQ = 4;
-  if(HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
-  {
-    /* Initialization Error */
-    while(1);
-  }
-  
-  /* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2 
-     clocks dividers */
-  RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
-  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
-  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
-  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;  
-  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;  
-  if(HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_4) != HAL_OK)
-  {
-    /* Initialization Error */
-    while(1);
-  }
-}
-
-/*
-Inititalise the LED2 GPIO port
-*/
-
-void LED2_Init(struct led this)
-{
-
-   GPIO_InitTypeDef  gpio_init_structure;
-  
-   switch (this.portname){
-   case 'A':
-     LED1_GPIO_CLK_ENABLE();
-   break;
-   case 'B':
-     LED2_GPIO_CLK_ENABLE();
-   break;
-   }
-  /* Configure the GPIO_LED pin */
-  gpio_init_structure.Pin   = this.pin;
-  gpio_init_structure.Mode  = GPIO_MODE_OUTPUT_PP;
-  gpio_init_structure.Pull  = GPIO_NOPULL;
-  gpio_init_structure.Speed = GPIO_SPEED_FREQ_HIGH;
-  
-  HAL_GPIO_Init(this.port, &gpio_init_structure);
-}
-
-/*
-
-deinit the GPIO for LED2
-
-*/
-void LED2_DeInit(struct led this)
-{
-  GPIO_InitTypeDef  gpio_init_structure;
-
-  switch (this.portname){
-   case 'A':
-     LED1_GPIO_CLK_DISABLE();
-   break;
-   case 'B':
-     LED2_GPIO_CLK_DISABLE();
-   break;
-   }
-  gpio_init_structure.Pin = this.pin;
-  
-  /* Turn off LED */
-  HAL_GPIO_WritePin(this.port, this.pin, GPIO_PIN_RESET);
-  HAL_GPIO_DeInit(this.port, gpio_init_structure.Pin);
-}
-
-
-/*
-
-Turn LED2 on
-
-*/
-void LED2_On(struct led this)
-{
-  HAL_GPIO_WritePin(this.port, this.pin, GPIO_PIN_SET);
-}
-
-/* 
-turn LED2 off
-*/
-
-void LED2_Off(struct led this)
-{
-  HAL_GPIO_WritePin(this.port, this.pin, GPIO_PIN_RESET);
-}
-
-void LED2_Toggle(struct led this)
-{
-  HAL_GPIO_TogglePin(this.port, this.pin);
-}
-