diff --git a/Core/Inc/HTPA_32x32d.h b/Core/Inc/HTPA_32x32d.h
index ceb5e46..c147fc1 100644
--- a/Core/Inc/HTPA_32x32d.h
+++ b/Core/Inc/HTPA_32x32d.h
@@ -1,19 +1,29 @@
-/*
- * HTPA_32x32d.h
- *
- *  Created on: Mar 24, 2023
- *      Author: Getac
+/**
+ * @file HTPA_32x32d.h
+ * @brief Header for HTPA 32x32d infrared array sensor library
+ * @author Tim-Erik Düntzsch t.duentzsch@fasttube.de
+ * 
+ * @date 25.03.2023 - first implementation (untested)
+ * 
+ * @todo finish HTPA_ReadBlock function
+ * @todo add calibration function
+ * @todo add temperature conversion function
+ * 
+ * @test communication and readout
+ * 
+ * @version 0.1
  */
 
 #ifndef INC_HTPA_32X32D_H_
 #define INC_HTPA_32X32D_H_
 
+/// @brief HTPA status register struct
 typedef struct {
-	uint8_t block;
-	uint8_t vdd_meas;
-	uint8_t blind;
-	uint8_t eoc;
-}HTPA_Status;
+	uint8_t block;	// currently selected block
+	bool vdd_meas;	// selection whether first two bytes are VDD or PTA
+	bool blind;
+	bool eoc;		// end of conversion flag
+} HTPA_Status;
 
 void HTPA_Init(I2C_HandleTypeDef *);
 
diff --git a/Core/Src/HTPA_32x32d.c b/Core/Src/HTPA_32x32d.c
index 7058537..2d01ccd 100644
--- a/Core/Src/HTPA_32x32d.c
+++ b/Core/Src/HTPA_32x32d.c
@@ -1,14 +1,24 @@
-/*
- * HTPA_32x32d.c
- *
- *  Created on: Mar 24, 2023
- *      Author: Getac
+/**
+ * @file HTPA_32x32d.c
+ * @brief Library for HTPA 32x32d infrared array sensor
+ * @author Tim-Erik Düntzsch t.duentzsch@fasttube.de
+ * 
+ * @date 25.03.2023 - first implementation (untested)
+ * 
+ * @todo finish HTPA_ReadBlock function
+ * @todo add calibration function
+ * @todo add temperature conversion function
+ * 
+ * @test communication and readout
+ * 
+ * @version 0.1
  */
 
+#include <stdbool.h>
 #include "main.h"
 #include "HTPA_32x32d.h"
 
-// I2C adress
+// I2C address
 #define HTPA_SENSOR_ADDRESS		0x1A
 #define HTPA_EEPROM_ADDRESS		0x50
 
@@ -21,7 +31,7 @@
 #define HTPA_SENSOR_TRIM_5		0x07	// Common mode voltage preamplifier top
 #define HTPA_SENSOR_TRIM_6		0x08	// Common mode voltage preamplifier bot
 #define HTPA_SENSOR_TRIM_7		0x09	// Interal pull-ups SDA, SCL
-// Sensor read only
+// Sensor read only registers
 #define HTPA_SENSOR_STATUS		0x02	// Status register
 #define HTPA_SENSOR_READTOP		0x0A	// Read top half
 #define HTPA_SENSOR_READBOT		0x0B	// Read bot half
@@ -33,7 +43,15 @@ HAL_StatusTypeDef i2c_return;	// error handling maybe?
 
 uint16_t blockData[128];
 
-
+/**
+ * @brief Initialization of HTPA Sensor
+ * 
+ * Sets the wakeup bit in the status register and writes the desired sensor
+ * configuration to the respective registers.
+ * Afterwards the sensor is in idle and ready for conversion.
+ * 
+ * @param *hi2c: Pointer to I2C Handle
+*/
 void HTPA_Init(I2C_HandleTypeDef *hi2c){
 	i2c_handle = *hi2c;
 	// Berechnung für clk / sample aus I2C parametern?
@@ -47,29 +65,58 @@ void HTPA_Init(I2C_HandleTypeDef *hi2c){
 	HTPA_WriteRegister(HTPA_SENSOR_TRIM_7, 0x88);
 }
 
+/**
+ * @brief Read data of one block in one array half
+ * 
+ * Block selection gets written to the config register and conversion is started.
+ * After selected block of upper and lower half are converted, the selected half
+ * is read and the data stored in the passed array.
+ * 
+ * @param array_half: 	select top or bottom half of array
+ * @param block:		select block of array half (0-3)
+ * @param *pData[128]:	pointer to 128 word array for read data
+*/
 void HTPA_ReadBlock(uint8_t array_half, uint8_t block, uint16_t *pData[128]){
-	uint8_t config = (block << 4);	// bit 5,4 block
+	uint8_t config = 0;
+	config = (block << 4);	// bit 5,4 block
 	config |= 0x09;					// bit 3 start | bit 1 wakeup
 	HTPA_WriteRegister(HTPA_SENSOR_CONFIG, config);
+	// tbc
 }
 
+/**
+ * @brief Write to selected sensor register
+ * 
+ * description
+ * 
+ * @param register_address: 	address of register
+ * @param byte:					byte to be written to register
+*/
 void HTPA_WriteRegister(uint8_t register_address, uint8_t byte){
 	uint8_t i2c_data = register_address;
 	uint8_t i2c_address = (HTPA_SENSOR_ADDRESS << 1);
-	i2c_address |= 0x00;	// set read/write bit to write (0)
+	i2c_address &= 0xFE;	// set read/write bit to write (0)
 	HAL_I2C_Master_Transmit(&i2c_handle, i2c_address, &i2c_data, 1, I2C_MAX_DELAY);
 	i2c_data = byte;
 	HAL_I2C_Master_Transmit(&i2c_handle, i2c_address, &i2c_data, 1, I2C_MAX_DELAY);
 }
 
+/**
+ * @brief Get status of sensor
+ * 
+ * Reads the sensors status register and stores the information in
+ * the HTPA_Statsu structure.
+ * 
+ * @return HTPA_Status:		status register struct
+*/
 HTPA_Status HTPA_GetStatus(void){
 	HTPA_Status status_return;
 	uint8_t i2c_data = HTPA_SENSOR_STATUS;
 	uint8_t i2c_address = (HTPA_SENSOR_ADDRESS << 1);
 	uint8_t i2c_readData = 0;
-	i2c_address |= 0x00;	// set read/write bit to write (0)
+	i2c_address &= 0xFE;	// set read/write bit 0 to write (0)
 	HAL_I2C_Master_Transmit(&i2c_handle, i2c_address, &i2c_data, 1, I2C_MAX_DELAY);
-	i2c_address |= 0x01;	// set read/write bit to read (1)
+	i2c_address |= 0x01;	// set read/write bit 0 to read (1)
 	HAL_I2C_Master_Receive(&i2c_handle, i2c_address, &i2c_readData, 1, I2C_MAX_DELAY);
 	status_return.block = (i2c_readData >> 4) && 0xFC;
 	status_return.vdd_meas = (i2c_readData >> 2) && 0xFE;