diff --git a/lib/sensor_sdm120.c b/lib/sensor_sdm120.c
index af92f3f..7073772 100644
--- a/lib/sensor_sdm120.c
+++ b/lib/sensor_sdm120.c
@@ -13,7 +13,7 @@
  *
  */
 /** library to query measurements from eastron SDM120-ModBus electricity meter (code)
- *  @file sensor_sdm120.h
+ *  @file sensor_sdm120.c
  *  @author King Kévin <kingkevin@cuvoodoo.info>
  *  @date 2016
  *  @note peripherals used: USART @ref sensor_sdm120_usart , GPIO @ref sensor_sdm120_gpio
@@ -33,13 +33,13 @@
 #include "sensor_sdm120.h" // SDM120 electricity meter header and definitions
 #include "global.h" // common methods
 
-/** @defgroup sensor_psdm120_usart USART peripheral used for communication with electricity meter
+/** @defgroup sensor_sdm120_usart USART peripheral used for communication with electricity meter
  *  @{
  */
 #define SENSOR_SDM120_USART 3 /**< USART peripheral */
 /** @} */
 
-/** @defgroup sensor_psdm120_gpio GPIO peripheral used for controlling RS-485 adapter
+/** @defgroup sensor_sdm120_gpio GPIO peripheral used for controlling RS-485 adapter
  *  @note driver output is enabled on high while receiver output is enabled on low, thus one pin can be used to control both
  *  @{
  */
@@ -87,7 +87,7 @@ static const uint16_t register_holding[] = {
 /** compute CRC for ModBus
  *  @note ModBus uses ANSi/IBM 16-bits CRC (with normal polynomial 0x8005, reverse polynomial 0xA001, start value 0xfff)
  *  @param[in] buffer data on which to compute the CRC for
- *  @param[in] number of byte to compute the CRC for
+ *  @param[in] size number of byte to compute the CRC for
  *  @return computed CRC checksum
  */
 static uint16_t crc_modbus(uint8_t* buffer, uint8_t size)
diff --git a/lib/sensor_sdm120.h b/lib/sensor_sdm120.h
index 828c9d4..b5e8ccf 100644
--- a/lib/sensor_sdm120.h
+++ b/lib/sensor_sdm120.h
@@ -57,19 +57,19 @@ enum sensor_sdm120_configuration_type_t {
 /** setup peripherals to communicate with electricity meter */
 void sensor_sdm120_setup(void);
 /** request measurement from electricity meter
- *  @param[in] mater_id electricity meter device ID
+ *  @param[in] meter_id electricity meter device ID
  *  @param[in] type measurement type to request
  *  @return if transmission started
  */
 bool sensor_sdm120_measurement_request(uint8_t meter_id, enum sensor_sdm120_measurement_type_t type);
 /** request configuration from electricity meter
- *  @param[in] mater_id electricity meter device ID
+ *  @param[in] meter_id electricity meter device ID
  *  @param[in] type configuration type to request
  *  @return if transmission started
  */
 bool sensor_sdm120_configuration_request(uint8_t meter_id, enum sensor_sdm120_configuration_type_t type);
 /** set configuration in electricity meter
- *  @param[in] mater_id electricity meter device ID
+ *  @param[in] meter_id electricity meter device ID
  *  @param[in] type configuration type to set
  *  @param[in] value configuration value to set
  *  @return if transmission started
diff --git a/main.c b/main.c
index 036e45d..6b8701d 100644
--- a/main.c
+++ b/main.c
@@ -46,6 +46,8 @@
 #include "sensor_sdm120.h" // SDM120 electricity meter utilities
 #include "radio_esp8266.h" // ESP8266 WiFi SoC utilities
 
+#define WATCHDOG_PERIOD 10000 /**< watchdog period in ms */
+
 /** @defgroup main_flags flag set in interrupts to be processed in main task
  *  @{
  */
@@ -271,7 +273,6 @@ void main(void)
 
 #if !(DEBUG)
 	//setup watchdog to reset in case we get stuck (i.e. when an error occurred)
-	#define WATCHDOG_PERIOD 10000 /**< watchdog period in ms */
 	printf("setup watchdog (%.2fs): ",WATCHDOG_PERIOD/1000.0);
 	iwdg_set_period_ms(WATCHDOG_PERIOD); // set independent watchdog period
 	iwdg_start(); // start independent watchdog