diff --git a/bsl/csl/interfaces/delay.hpp b/bsl/csl/interfaces/delay.hpp
new file mode 100644
index 0000000..6e81ac1
--- /dev/null
+++ b/bsl/csl/interfaces/delay.hpp
@@ -0,0 +1,16 @@
+#ifndef _DELAY_H_
+#define _DELAY_H_
+
+#include <stdint.h>
+
+class Delay
+{
+	public:
+		Delay(); 
+		~Delay(); 	
+		void us(uint16_t delay); 
+	private: 
+};
+
+#endif
+
diff --git a/bsl/csl/interfaces/pin.hpp b/bsl/csl/interfaces/pin.hpp
index 3d0e48d..d53381b 100644
--- a/bsl/csl/interfaces/pin.hpp
+++ b/bsl/csl/interfaces/pin.hpp
@@ -3,7 +3,6 @@
 
 #include <unistd.h>
 #include <stdint.h>
-#include <memory>
 
 class Pin 
 {
diff --git a/bsl/csl/stm32f042/Src/CMakeLists.txt b/bsl/csl/stm32f042/Src/CMakeLists.txt
index 82b5f71..563e4a6 100644
--- a/bsl/csl/stm32f042/Src/CMakeLists.txt
+++ b/bsl/csl/stm32f042/Src/CMakeLists.txt
@@ -22,3 +22,10 @@ target_compile_options(stmGpio PRIVATE ${C_FLAGS})
 target_compile_definitions(stmGpio PRIVATE ${C_DEFS})
 target_include_directories(stmGpio PUBLIC ${INTERFACES_DIR} ${CSL_INCLUDES})
 add_library(sub::gpio ALIAS stmGpio)
+
+add_library(stmDelay delay.cpp)
+
+target_compile_options(stmDelay PRIVATE ${C_FLAGS})
+target_compile_definitions(stmDelay PRIVATE ${C_DEFS})
+target_include_directories(stmDelay PUBLIC ${INTERFACES_DIR} ${CSL_INCLUDES})
+add_library(sub::delay ALIAS stmDelay)
diff --git a/bsl/csl/stm32f042/Src/delay.cpp b/bsl/csl/stm32f042/Src/delay.cpp
new file mode 100644
index 0000000..aabf707
--- /dev/null
+++ b/bsl/csl/stm32f042/Src/delay.cpp
@@ -0,0 +1,19 @@
+#include "delay.hpp" 
+#include "../Inc/stm32f0xx_csl.h"
+
+
+
+Delay::Delay()
+{
+
+}
+
+Delay::~Delay()
+{
+
+}
+
+void Delay::us(uint16_t delay)
+{
+	LL_mDelay(delay); 
+}
diff --git a/bsl/csl/stm32f042/Src/stm32f0xx_csl.c b/bsl/csl/stm32f042/Src/stm32f0xx_csl.c
index 245476a..5029e8b 100644
--- a/bsl/csl/stm32f042/Src/stm32f0xx_csl.c
+++ b/bsl/csl/stm32f042/Src/stm32f0xx_csl.c
@@ -141,17 +141,15 @@ void SystemClock_Config(void)
   * @param None
   * @retval None
   */
+/*
 static void MX_GPIO_Init(void)
 {
   LL_GPIO_InitTypeDef GPIO_InitStruct = {0};
 
-  /* GPIO Ports Clock Enable */
   LL_AHB1_GRP1_EnableClock(LL_AHB1_GRP1_PERIPH_GPIOB);
 
-  /**/
   LL_GPIO_ResetOutputPin(LED_G_GPIO_Port, LED_G_Pin);
 
-  /**/
   GPIO_InitStruct.Pin = LED_G_Pin;
   GPIO_InitStruct.Mode = LL_GPIO_MODE_OUTPUT;
   GPIO_InitStruct.Speed = LL_GPIO_SPEED_FREQ_LOW;
@@ -160,7 +158,7 @@ static void MX_GPIO_Init(void)
   LL_GPIO_Init(LED_G_GPIO_Port, &GPIO_InitStruct);
 
 }
-
+*/
 /* USER CODE BEGIN 4 */
 
 /* USER CODE END 4 */
diff --git a/bsl/nucleo_f042k6/bslConfig.cmake b/bsl/nucleo_f042k6/bslConfig.cmake
index f7dfb43..9406819 100644
--- a/bsl/nucleo_f042k6/bslConfig.cmake
+++ b/bsl/nucleo_f042k6/bslConfig.cmake
@@ -75,3 +75,4 @@ list(APPEND EXTRA_LIBS sub::startup)
 list(APPEND EXTRA_LIBS sub::translator)
 list(APPEND EXTRA_LIBS sub::sources)
 list(APPEND EXTRA_LIBS sub::gpio)
+list(APPEND EXTRA_LIBS sub::delay)
diff --git a/bsl/nucleo_f042k6/bsl_nucleo_f042k6.cpp b/bsl/nucleo_f042k6/bsl_nucleo_f042k6.cpp
index 337fa18..0a41826 100644
--- a/bsl/nucleo_f042k6/bsl_nucleo_f042k6.cpp
+++ b/bsl/nucleo_f042k6/bsl_nucleo_f042k6.cpp
@@ -1,17 +1,19 @@
 #include "bsl_nucleo_f042k6.hpp"
 #include "../csl/interfaces/pin.hpp" 
+#include "../csl/interfaces/delay.hpp" 
 
 int startBSL() 
 {
 	stmStart();
 
 	Pin pin; 
-	
+	Delay delay; 
+
 	while(1)
 	{
-		LL_mDelay(50); 
+		delay.us(500);
 		pin.write(true);
-		LL_mDelay(50); 
+		delay.us(500);
 		pin.write(false);
 	}