diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6124cac..bcaaca9 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -29,7 +29,6 @@ set(INTERFACES_DIR ${CMAKE_SOURCE_DIR}/bsl/csl/interfaces)
 ####################################################################################################
 include(${PROJECT_DEFS})
 add_subdirectory(bsl)
-add_subdirectory(drivers/led)
 
 set(BSL_HEADER_FILE ${CMAKE_SOURCE_DIR}/bsl/raspberry/bsl_raspberry.hpp)
 
diff --git a/bsl/csl/interfaces/i2c.hpp b/bsl/csl/interfaces/i2c.hpp.bak
similarity index 100%
rename from bsl/csl/interfaces/i2c.hpp
rename to bsl/csl/interfaces/i2c.hpp.bak
diff --git a/bsl/csl/interfaces/pin.h b/bsl/csl/interfaces/pin.h
new file mode 100644
index 0000000..ba42617
--- /dev/null
+++ b/bsl/csl/interfaces/pin.h
@@ -0,0 +1,132 @@
+#ifndef _GPIO_H_
+#define _GPIO_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <unistd.h>
+#include <stdint.h>
+
+
+#ifdef ARM_MCU
+#include "../stm32f042/Drivers/CMSIS/Device/ST/STM32F0xx/Include/stm32f042x6.h"
+	typedef enum 
+	{
+		pinA0 = GPIOA_BASE	|| 0,
+		pinA1 = GPIOA_BASE	|| 1,
+		pinA2 = GPIOA_BASE	|| 2,
+		pinA3 = GPIOA_BASE	|| 3,
+		pinA4 = GPIOA_BASE	|| 4,
+		pinA5 = GPIOA_BASE	|| 5,
+		pinA6 = GPIOA_BASE	|| 6,
+		pinA7 = GPIOA_BASE	|| 7,
+		pinA8 = GPIOA_BASE	|| 8,
+		pinA9 = GPIOA_BASE	|| 9,
+		pinA10 = GPIOA_BASE || 10,
+		pinA11 = GPIOA_BASE || 11,
+		pinA12 = GPIOA_BASE || 12,
+		pinA13 = GPIOA_BASE || 13,
+		pinA14 = GPIOA_BASE || 14,
+		pinA15 = GPIOA_BASE || 15,
+
+		pinB0 = GPIOB_BASE	|| 0,
+		pinB1 = GPIOB_BASE	|| 1,
+		pinB3 = GPIOB_BASE	|| 3,
+		pinB4 = GPIOB_BASE	|| 4,
+		pinB5 = GPIOB_BASE	|| 5,
+		pinB6 = GPIOB_BASE	|| 6,
+		pinB7 = GPIOB_BASE	|| 7,
+		pinB8 = GPIOB_BASE	|| 8,
+
+		pinF0 = GPIOF_BASE	|| 0,
+		pinF1 = GPIOF_BASE	|| 1
+	}pinNo_t;
+#endif
+
+#ifdef RASPBERRY
+#endif
+
+typedef enum 
+{
+	undefined,
+	input, 
+	output, 
+	analog, 
+	alternate
+}mode;
+
+typedef enum 
+{
+	floating, 
+	pushPull, 
+	openDrain 
+}state;
+
+typedef enum 
+{
+	none,
+	pullUp,
+	pullDown
+}pullUpDown;
+
+typedef enum 
+{
+	slow, 
+	normal, 
+	fast, 
+	veryFast
+}speed;
+
+typedef enum 
+{
+	disabled,
+	enabled 
+}interrupt;
+
+typedef struct 
+{
+	mode md; 
+	state st;
+	pullUpDown pud;
+	speed sp;
+	interrupt intr; 
+}configuration;
+
+typedef enum 
+{
+	notValidMode,
+	notValidOut,
+	OutOfRange,
+	NotDeclared, 
+	NotReachable, 
+	NoPullUpDown, 
+	NotAnalog, 
+	NotDigital, 
+	TooFast, 
+	Bocked, 
+	AlreadyUsed,
+	NotGpio
+}errors;
+
+void setMode(pinNo_t pinNo, mode mode);
+void setOutputState(pinNo_t pinNo, state state); 
+void setPullUpDonw(pinNo_t pinNo, pullUpDown resistance); 
+void setSpeed(pinNo_t pinNo, speed speed); 
+void config(pinNo_t pinNo, mode mode, state state, pullUpDown resistance, speed speed); 
+
+uint8_t get(pinNo_t pinNo);
+void toggle(pinNo_t pinNo);
+void set(pinNo_t pinNo, uint8_t state);
+
+void init(pinNo_t pinNo);
+void deInit(pinNo_t pinNo);
+
+void hardwareInfo(pinNo_t pinNo);
+void throwError(); 	
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif //  _GPIO_H_
diff --git a/bsl/csl/interfaces/pin.hpp b/bsl/csl/interfaces/pin.hpp
deleted file mode 100644
index bd1aaba..0000000
--- a/bsl/csl/interfaces/pin.hpp
+++ /dev/null
@@ -1,92 +0,0 @@
-#ifndef _GPIO_H_
-#define _GPIO_H_
-
-#include <unistd.h>
-#include <stdint.h>
-#include <memory>
-
-class Pin 
-{
-	public: 
-		enum mode
-		{
-			undefined,
-			input, 
-			output, 
-			analog, 
-			alternate
-		};
-		
-		enum state
-		{
-			floating, 
-			pushPull, 
-			openDrain 
-		};
-		
-		enum pullUpDown
-		{
-			none,
-			pullUp,
-			pullDown
-		};
-
-		enum speed
-		{
-			slow, 
-			normal, 
-			fast, 
-			veryFast
-		};
-		
-		enum interrupt
-		{
-			disabled,
-			enabled 
-		};
-	
-		struct configuration
-		{
-			mode md; 
-			state st;
-			pullUpDown pud;
-			speed sp;
-			interrupt intr; 
-		};
-
-		enum errors
-		{
-			notValidMode,
-			notValidOut,
-			OutOfRange,
-			NotDeclared, 
-			NotReachable, 
-			NoPullUpDown, 
-			NotAnalog, 
-			NotDigital, 
-			TooFast, 
-			Bocked, 
-			AlreadyUsed,
-			NotGpio
-		};
-
-		virtual void setMode(mode mode) = 0;
-		virtual void setOutputState(state state) = 0; 
-		virtual void setPullUpDonw(pullUpDown resistance) = 0; 
-		virtual void setSpeed(speed speed) = 0; 
-		virtual void config(mode mode, state state, pullUpDown resistance, speed speed) = 0; 
-		
-		virtual bool read() = 0;
-		virtual void toggle() = 0;
-		virtual void write(bool state) = 0;
-
-		virtual void init() = 0;
-		virtual void deInit() = 0;
-		
-		virtual void hardwareInfo() = 0;
-
-	private:
-		virtual void throwError(uint16_t line, errors errNo) = 0; 	
-};
-
-#endif //  _GPIO_H_
diff --git a/bsl/csl/interfaces/spi.hpp b/bsl/csl/interfaces/spi.hpp.bak
similarity index 100%
rename from bsl/csl/interfaces/spi.hpp
rename to bsl/csl/interfaces/spi.hpp.bak
diff --git a/bsl/csl/interfaces/spich.hpp b/bsl/csl/interfaces/spich.hpp.bak
similarity index 100%
rename from bsl/csl/interfaces/spich.hpp
rename to bsl/csl/interfaces/spich.hpp.bak
diff --git a/bsl/csl/stm32f042/Inc/stm_pin.hpp b/bsl/csl/stm32f042/Inc/stm_pin.hpp.bak
similarity index 98%
rename from bsl/csl/stm32f042/Inc/stm_pin.hpp
rename to bsl/csl/stm32f042/Inc/stm_pin.hpp.bak
index eba4abc..2f417c4 100644
--- a/bsl/csl/stm32f042/Inc/stm_pin.hpp
+++ b/bsl/csl/stm32f042/Inc/stm_pin.hpp.bak
@@ -1,8 +1,8 @@
 #ifndef __STM_PIN_HPP__
 #define __STM_PIN_HPP__
 
-#include "../../interfaces/pin.hpp" 
-#include "../Drivers/CMSIS/Device/ST/STM32F0xx/Include/stm32f042x6.h"
+//#include "../../interfaces/pin.hpp" 
+//#include "../Drivers/CMSIS/Device/ST/STM32F0xx/Include/stm32f042x6.h"
 #include <array>
 #include <stdint.h>
 
diff --git a/bsl/csl/stm32f042/Src/CMakeLists.txt b/bsl/csl/stm32f042/Src/CMakeLists.txt
index 0d30d3f..9b1e9be 100644
--- a/bsl/csl/stm32f042/Src/CMakeLists.txt
+++ b/bsl/csl/stm32f042/Src/CMakeLists.txt
@@ -5,7 +5,8 @@ set (STMSRC_INCLUDES
 set(STMSRC_SOURCES
 	stm32f0xx_csl.c
 	stm32f0xx_it.c 
-	system_stm32f0xx.c)
+	system_stm32f0xx.c
+	)
 
 add_library(stmSources ${STMSRC_SOURCES})
 target_compile_options(stmSources PRIVATE ${C_FLAGS})
@@ -19,3 +20,9 @@ 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)
+
+add_library(stmPin pin.c)
+target_compile_options(stmPin PRIVATE ${C_FLAGS})
+target_compile_definitions(stmPin PRIVATE ${C_DEFS})
+target_include_directories(stmPin PUBLIC ${INTERFACES_DIR} ${CSL_INCLUDES})
+add_library(sub::pin ALIAS stmPin)
diff --git a/bsl/csl/stm32f042/Src/delay.cpp b/bsl/csl/stm32f042/Src/delay.cpp
index 74b4745..a178edd 100644
--- a/bsl/csl/stm32f042/Src/delay.cpp
+++ b/bsl/csl/stm32f042/Src/delay.cpp
@@ -1,8 +1,6 @@
 #include "delay.hpp" 
 #include "../Inc/stm32f0xx_csl.h"
 
-
-
 Delay::Delay()
 {
 
diff --git a/bsl/csl/stm32f042/Src/pin.c b/bsl/csl/stm32f042/Src/pin.c
new file mode 100644
index 0000000..2caeb97
--- /dev/null
+++ b/bsl/csl/stm32f042/Src/pin.c
@@ -0,0 +1,75 @@
+#include "pin.h"
+
+
+void setMode(pinNo_t pinNo, mode mode)
+{
+	
+}
+
+void setOutputState(pinNo_t pinNo, state state)
+{
+	RCC->AHBENR |= RCC_AHBENR_GPIOBEN;
+	// Set PIN 3 of port B as Output
+	GPIOB->MODER |= GPIO_MODER_MODER3_0;
+	GPIOB->MODER &=~ GPIO_MODER_MODER3_1;	
+}
+ 
+void setPullUpDonw(pinNo_t pinNo, pullUpDown resistance)
+{
+	
+}
+ 
+void setSpeed(pinNo_t pinNo, speed speed)
+{
+	
+}
+ 
+void config(pinNo_t pinNo, mode mode, state state, pullUpDown resistance, speed speed)
+{
+	
+}
+ 
+
+uint8_t get(pinNo_t pinNo)
+{
+	
+}
+
+void toggle(pinNo_t pinNo)
+{
+	
+}
+
+void set(pinNo_t pinNo, uint8_t state)
+{
+	if(state == 1)
+	{
+		GPIOB->BSRR |= GPIO_BSRR_BS_3; 
+		return;
+	}
+	GPIOB->BSRR |= GPIO_BSRR_BR_3;
+}
+
+void init(pinNo_t pinNo)
+{
+	
+}
+
+void deInit(pinNo_t pinNo)
+{
+	
+}
+
+
+void hardwareInfo(pinNo_t pinNo)
+{
+	
+}
+
+void throwError()
+{
+	
+}
+ 	
+
+
diff --git a/bsl/nucleo_f042k6/bslConfig.cmake b/bsl/nucleo_f042k6/bslConfig.cmake
index 83da8a6..199fcd0 100644
--- a/bsl/nucleo_f042k6/bslConfig.cmake
+++ b/bsl/nucleo_f042k6/bslConfig.cmake
@@ -74,6 +74,6 @@ set (CPP_DEFS ${C_DEFS})
 list(APPEND EXTRA_LIBS sub::startup)
 list(APPEND EXTRA_LIBS sub::translator)
 list(APPEND EXTRA_LIBS sub::sources)
-#list(APPEND EXTRA_LIBS sub::gpio) # TODO : PLease add this again.
 list(APPEND EXTRA_LIBS sub::delay)
-list(APPEND EXTRA_LIBS sub::led)
+list(APPEND EXTRA_LIBS sub::pin) # TODO : PLease add this again.
+#list(APPEND EXTRA_LIBS sub::led)
diff --git a/bsl/nucleo_f042k6/bsl_nucleo_f042k6.cpp b/bsl/nucleo_f042k6/bsl_nucleo_f042k6.cpp
index 2c0b349..30fbac0 100644
--- a/bsl/nucleo_f042k6/bsl_nucleo_f042k6.cpp
+++ b/bsl/nucleo_f042k6/bsl_nucleo_f042k6.cpp
@@ -10,27 +10,12 @@ Nucleo_f042k6::~Nucleo_f042k6(){}
 
 void Nucleo_f042k6::init()
 {
-	ledPin.init();
-	ledPin.setMode(Pin::mode::output);
-	ledPin.setSpeed(Pin::speed::fast);
-		
-	//Led ledGreen;
 	
-	/*
-	pin_a0.init();
-	pin_a0.setMode(Pin::mode::input);
-	pin_a0.setSpeed(Pin::speed::slow);
-	pin_a0.setPullUpDonw(Pin::pullUpDown::pullDown);
-	*/
 }
 
 void Nucleo_f042k6::running()
 {
-		STM_Pin<Pin_no::pin_3, GPIO_Port::Port_B_base_address> ledPin;
-		Led ledGreen(&ledPin);
-		ledGreen.on();
-		delay.ms(200); 
-		ledGreen.off();
-		delay.ms(200); 
+		delay.ms(1000); 
+		delay.ms(1000); 
 }
 
diff --git a/bsl/nucleo_f042k6/bsl_nucleo_f042k6.hpp b/bsl/nucleo_f042k6/bsl_nucleo_f042k6.hpp
index d53c102..8d98c25 100644
--- a/bsl/nucleo_f042k6/bsl_nucleo_f042k6.hpp
+++ b/bsl/nucleo_f042k6/bsl_nucleo_f042k6.hpp
@@ -1,10 +1,8 @@
 #ifndef BSL_NUCLEO_F042K6_H
 #define BSL_NUCLEO_F042K6_H
 
-#include "../csl/interfaces/pin.hpp" 
+#include "../csl/interfaces/pin.h" 
 #include "../csl/interfaces/delay.hpp" 
-#include "../csl/stm32f042/Inc/stm_pin.hpp"
-#include "../../drivers/led/led.hpp"
 #include "stm32f0xx_csl.h"
 
 class Nucleo_f042k6
@@ -20,9 +18,6 @@ class Nucleo_f042k6
 	
 	private : 
 	Delay delay; 
-	//STM_Pin<Pin_no::pin_0, GPIO_Port::Port_A_base_address> pin_a0;
-	STM_Pin<Pin_no::pin_3, GPIO_Port::Port_B_base_address> ledPin;
-	//Led ledGreen(&STM_Pin<Pin_no::pin_3, GPIO_Port::Port_B_base_address>); 
 }; 
 
 #endif /* BSL_NUCLEO_F042K6_H */
diff --git a/drivers/led/led.hpp b/drivers/led/led.hpp
index 2a6db6d..5fda306 100644
--- a/drivers/led/led.hpp
+++ b/drivers/led/led.hpp
@@ -1,9 +1,6 @@
 #ifndef _LED_HPP
 #define _LED_HPP
 
-// TODO : Change Cmake to include "pin.hpp"
-#include "../../bsl/csl/interfaces/pin.hpp"
-#include "../../bsl/csl/interfaces/delay.hpp"
 
 class Led
 {
diff --git a/main.cpp b/main.cpp
index b9ae02e..b7d2c24 100644
--- a/main.cpp
+++ b/main.cpp
@@ -1,14 +1,19 @@
 #include"main.hpp"
-#include"drivers/led/led.hpp"
+#include"bsl/csl/interfaces/delay.hpp"
+//#include"bsl/csl/interfaces/pin.h"
 
 int main(int argc, char *argv[])
 {
-	Nucleo_f042k6 bsl; 
+	Delay delay;
 
-	bsl.init();
+	setMode(pinB3,output); 
+	throwError();
 	while(1)
 	{	
-		bsl.running(); 
+		set(pinB3,1);
+		delay.ms(100); 
+		set(pinB3,0);
+		delay.ms(100); 
 	}
 
 	return 1;