diff -r 106464d4c727 -r 8b630bf52092 main/u8g2_esp32_hal.h
--- a/main/u8g2_esp32_hal.h	Mon Nov 11 20:12:55 2019 +0100
+++ b/main/u8g2_esp32_hal.h	Tue Nov 12 10:36:53 2019 +0100
@@ -1,8 +1,7 @@
-/*
- * u8g2_esp32_hal.h
- *
- *  Created on: Feb 12, 2017
- *      Author: kolban
+/**
+ * @file u8g2_esp32_hal.h
+ * @date Feb 12, 2017
+ * @author kolban
  */
 
 #ifndef U8G2_ESP32_HAL_H_
@@ -15,12 +14,12 @@
 
 #define U8G2_ESP32_HAL_UNDEFINED (-1)
 
-#define I2C_MASTER_NUM I2C_NUM_1           //  I2C port number for master dev
-#define I2C_MASTER_TX_BUF_DISABLE   0      //  I2C master do not need buffer
-#define I2C_MASTER_RX_BUF_DISABLE   0      //  I2C master do not need buffer
-#define I2C_MASTER_FREQ_HZ          50000  //  I2C master clock frequency
-#define ACK_CHECK_EN   0x1                 //  I2C master will check ack from slave
-#define ACK_CHECK_DIS  0x0                 //  I2C master will not check ack from slave
+#define I2C_MASTER_NUM I2C_NUM_1           ///<  I2C port number for master dev
+#define I2C_MASTER_TX_BUF_DISABLE   0      ///<  I2C master do not need buffer
+#define I2C_MASTER_RX_BUF_DISABLE   0      ///<  I2C master do not need buffer
+#define I2C_MASTER_FREQ_HZ          50000  ///<  I2C master clock frequency
+#define ACK_CHECK_EN   0x1                 ///<  I2C master will check ack from slave
+#define ACK_CHECK_DIS  0x0                 ///<  I2C master will not check ack from slave
 
 typedef struct {
 	gpio_num_t clk;