diff --git a/README.md b/README.md
index 0fc1488..c722be1 100644
--- a/README.md
+++ b/README.md
@@ -14,13 +14,20 @@ Kerems and Edwins Develeppoment platform.
 		- Project Level
 			- Integrate BSL dummy fct. to our main.cpp
 
-24.10.21 Helpfull links
 
-https://www.mankier.com/1/st-flash#Options
-
-fun with Linus and why he only wants C
-https://www.realworldtech.com/forum/?threadid=104196&curpostid=104299
-
-erasing flash
-
-```st-flash erase```
+INTERFACES: 
+	- pin
+		- pin.h Updated with a header infromation "header" and missing function have benn added. 
+		- pin.h Is tagged wiht version 1.0 and will be concidered as the first stalbe implementation
+		- pin.h will also be used by other interfaces when they need to initiate alternate functions
+ 	- USART
+		- we need to check what are the standart USART funtinalities and implement them all.
+		- usart.h the first implmentation will be made to make sure thte we have a working basis.
+
+
+DOCUMANTATION: 
+	- STM-Flash utility 
+		- https://www.mankier.com/1/st-flash#Options
+		- erasing flash ```st-flash erase```
+	- Fun with Linus and why he only wants C 
+		- https://www.realworldtech.com/forum/?threadid=104196&curpostid=104299
diff --git a/bsl/csl/interfaces/pin.h b/bsl/csl/interfaces/pin.h
index 1c121b3..4bf04a5 100644
--- a/bsl/csl/interfaces/pin.h
+++ b/bsl/csl/interfaces/pin.h
@@ -1,3 +1,22 @@
+/************************************************************************************************
+ * Authors	: Kerem Yollu & Edwin Koch
+ * Date		: 01.11.2021
+ * Version	: 1.0
+ *
+ * Description : 
+ * This header file for pin control is based on the most common configuation options
+ * curenty awailable for modern hardware. 
+ * Depending of the used Chip, some function may vary or be unawailable. 
+ * Please take a minute to go and explore the according Chips pin.c file to see woh each function 
+ * is implmented.  
+ *
+ * TODO: 
+ *  - 01.11.2021 : Should we add a seprate header in the cls layer containing the pinNo_t ?
+ *	- 01.11.2021 : Depending on request implment a pinLock() function
+ *	 
+ * LICENCE	: Please check the end of this file
+************************************************************************************************/
+
 #ifndef _GPIO_H_
 #define _GPIO_H_
 
@@ -62,7 +81,7 @@ typedef enum
 	floating, 
 	pushPull, 
 	openDrain 
-}state;
+}stage;
 
 typedef enum 
 {
@@ -88,7 +107,7 @@ typedef enum
 typedef struct 
 {
 	mode md; 
-	state st;
+	stage st;
 	pullUpDown pud;
 	speed sp;
 	interrupt intr; 
@@ -110,20 +129,39 @@ typedef enum
 	NotGpio
 }errors;
 
+// Configuration function that will call all the necessary function for an sucessfull pin initialisation
+void pinConfig(pinNo_t pinNo, mode mode, stage stage, pullUpDown resistance, speed speed); 
+// Modes to set the direction or function of the pin
 void pinSetMode(pinNo_t pinNo, mode mode);
-void pinSetOutputState(pinNo_t pinNo, state state); 
-void pinSetPullUpDonw(pinNo_t pinNo, pullUpDown resistance); 
+// Output Stage Push-Pull High-z ect...
+void pinSetOutputStage(pinNo_t pinNo, stage stage); 
+// Depending of the hardare it is able to select the speed of given pins
 void pinSetSpeed(pinNo_t pinNo, speed speed); 
-void pinConfig(pinNo_t pinNo, mode mode, state state, pullUpDown resistance, speed speed); 
+// If internal Pull-up or Pull-donws are wailable
+void pinSetPullUpDonw(pinNo_t pinNo, pullUpDown resistance); 
+// If pin is set as alternate this function will modify the pins functionality
+// If pin isn't set as alternate this function will set the pin to alternate mode. 
+void pinSetAlternate(pinNo_t pinNo, uint16_t alternate); 
 
+// Reads the pin's current value 
 uint8_t pinRead(pinNo_t pinNo);
+// Toggles th pin's value
 void pinToggle(pinNo_t pinNo);
+// Sets the pin hihg or low.
 void pinWrite(pinNo_t pinNo, uint8_t state);
 
+// Initiates all the preriferals needed for the given pin
 void pinInit(pinNo_t pinNo);
+// Deactivates all the preriferals needed for the given pin
 void pinDeInit(pinNo_t pinNo);
+// Resets pin to default
+void pinReset(pinNo_t pinNo);
 
+// Dependeing on the platform an the form of information printing.
+// Will pirnt tthe rurrent devices pin status and their configrarion.
 void pinHardwareInfo(pinNo_t pinNo);
+// Dependeing on the platfonr an the form of information printing.
+// Handles the given error and stops all further execution.
 void pinThrowError(); 	
 
 #ifdef __cplusplus
diff --git a/bsl/csl/interfaces/usart.h b/bsl/csl/interfaces/usart.h
index a10a08e..15385ab 100644
--- a/bsl/csl/interfaces/usart.h
+++ b/bsl/csl/interfaces/usart.h
@@ -1,3 +1,14 @@
+/************************************************************************************************
+ * Authors	: Kerem Yollu & Edwin Koch
+ * Date		: 31.11.2021
+ * Version	: 1.0
+ *
+ * Description : 
+ *
+ * TODO: 
+ *	 
+ * LICENCE	: Please check the end of this file
+************************************************************************************************/
 #ifndef _USART_H_
 #define _USART_H_
 
diff --git a/bsl/csl/stm32f042/Src/pin.c b/bsl/csl/stm32f042/Src/pin.c
index 189a389..23ca4ce 100644
--- a/bsl/csl/stm32f042/Src/pin.c
+++ b/bsl/csl/stm32f042/Src/pin.c
@@ -1,6 +1,6 @@
 #include "pin.h"
 
-#define MODER_IN		0x0UL		
+#define MODER_IN		0x0UL	
 #define MODER_OUT		0x1UL		
 #define MODER_ALTERNATE	0x2UL		
 #define MODER_ANALOG	0x3UL	
@@ -45,7 +45,7 @@ const uint32_t speedList[4] = {
 	OSPEEDR_HIGH
 };
 
-const uint32_t outputStateList[3] = 
+const uint32_t outputStgeList[3] = 
 {
 	OTYPER_OPEN_DRAIN,
 	OTYPER_PUSH_PULL,
@@ -60,10 +60,10 @@ void pinSetMode(pinNo_t pinNo, mode mode)
 	PIN_BASE->MODER |= (moderMode[mode] << ((pinNo & 0x0F) * 2));
 }
 
-void pinSetOutputState(pinNo_t pinNo, state state)
+void pinSetOutputStage(pinNo_t pinNo, stage stage)
 {
 	PIN_BASE->OSPEEDR &= 1 << (pinNo & 0x0F);	
-	PIN_BASE->OSPEEDR |= (outputStateList[state] << (pinNo & 0x0F));
+	PIN_BASE->OSPEEDR |= (outputStgeList[stage] << (pinNo & 0x0F));
 }
  
 void pinSetPullUpDonw(pinNo_t pinNo, pullUpDown resistance)
@@ -78,11 +78,11 @@ void pinSetSpeed(pinNo_t pinNo, speed speed)
 	PIN_BASE->OSPEEDR |= (speedList[speed] << ((pinNo & 0x0F) * 2));
 }
  
-void pinConfig(pinNo_t pinNo, mode mode, state state, pullUpDown resistance, speed speed)
+void pinConfig(pinNo_t pinNo, mode mode, stage stage, pullUpDown resistance, speed speed)
 {
-	pinInit(pinNo);	
+	pinInit(pinNo); //Very important to init first so that the corresponding bus gets his clock	
 	pinSetMode(pinNo, mode); 	
-	pinSetOutputState(pinNo, state); 
+	pinSetOutputStage(pinNo, stage); 
 	pinSetPullUpDonw(pinNo, resistance);
 	pinSetSpeed(pinNo,speed); 
 }
diff --git a/bsl/csl/stm32f042/Src/stm32f0xx_csl.c b/bsl/csl/stm32f042/Src/stm32f0xx_csl.c
index 071f545..b853171 100644
--- a/bsl/csl/stm32f042/Src/stm32f0xx_csl.c
+++ b/bsl/csl/stm32f042/Src/stm32f0xx_csl.c
@@ -88,7 +88,7 @@ int stmStart()
   /* USER CODE END SysInit */
 
   /* Initialize all configured peripherals */
-//  MX_GPIO_Init();
+  //MX_GPIO_Init();
   /* USER CODE BEGIN 2 */
 
   /* USER CODE END 2 */
@@ -97,7 +97,7 @@ int stmStart()
  // while (1)
  // {
     /* USER CODE END WHILE */
-//	LL_GPIO_TogglePin(LED_G_GPIO_Port,LED_G_Pin);
+	//LL_GPIO_TogglePin(LED_G_GPIO_Port,LED_G_Pin);
   //  LL_mDelay(100); 
 	/* USER CODE BEGIN 3 */
 //  }
diff --git a/main.cpp b/main.cpp
index 7f7b4d5..3f7788d 100644
--- a/main.cpp
+++ b/main.cpp
@@ -23,6 +23,7 @@ int main(int argc, char *argv[])
 
 	while(1)
 	{
+		
 		if(pinRead(pinA0))
 		{
 			pinWrite(pinB3,1);
@@ -31,8 +32,8 @@ int main(int argc, char *argv[])
 		{
 			pinWrite(pinB3,0);
 		}	
-	}
 
+	}
 	return 1;
 }