diff --git a/.cproject b/.cproject
index 484ea0a..03d44f1 100644
--- a/.cproject
+++ b/.cproject
@@ -78,7 +78,8 @@
 									<listOptionValue builtIn="false" value="USE_STDPERIPH_DRIVER"/>
 									<listOptionValue builtIn="false" value="HSE_VALUE=8000000"/>
 								</option>
-								<option id="ilg.gnuarmeclipse.managedbuild.cross.option.c.compiler.otherwarnings.1338324911" name="Other warning flags" superClass="ilg.gnuarmeclipse.managedbuild.cross.option.c.compiler.otherwarnings" useByScannerDiscovery="true" value="-Wunused-function" valueType="string"/>
+								<option id="ilg.gnuarmeclipse.managedbuild.cross.option.c.compiler.otherwarnings.1338324911" name="Other warning flags" superClass="ilg.gnuarmeclipse.managedbuild.cross.option.c.compiler.otherwarnings" useByScannerDiscovery="true" value="-Wunused-function -Wall" valueType="string"/>
+								<option id="ilg.gnuarmeclipse.managedbuild.cross.option.c.compiler.asmlisting.1200792307" name="Generate assembler listing (-Wa,-adhlns=&quot;$@.lst&quot;)" superClass="ilg.gnuarmeclipse.managedbuild.cross.option.c.compiler.asmlisting" useByScannerDiscovery="false" value="true" valueType="boolean"/>
 								<inputType id="ilg.gnuarmeclipse.managedbuild.cross.tool.c.compiler.input.726748309" superClass="ilg.gnuarmeclipse.managedbuild.cross.tool.c.compiler.input"/>
 							</tool>
 							<tool id="ilg.gnuarmeclipse.managedbuild.cross.tool.cpp.compiler.204317376" name="Cross ARM C++ Compiler" superClass="ilg.gnuarmeclipse.managedbuild.cross.tool.cpp.compiler">
diff --git a/.settings/language.settings.xml b/.settings/language.settings.xml
index 073aca8..dcd5003 100644
--- a/.settings/language.settings.xml
+++ b/.settings/language.settings.xml
@@ -5,7 +5,7 @@
 			<provider copy-of="extension" id="org.eclipse.cdt.ui.UserLanguageSettingsProvider"/>
 			<provider-reference id="org.eclipse.cdt.core.ReferencedProjectsLanguageSettingsProvider" ref="shared-provider"/>
 			<provider-reference id="org.eclipse.cdt.managedbuilder.core.MBSLanguageSettingsProvider" ref="shared-provider"/>
-			<provider class="org.eclipse.cdt.managedbuilder.language.settings.providers.GCCBuiltinSpecsDetector" console="false" env-hash="815361885035330323" id="ilg.gnuarmeclipse.managedbuild.cross.GCCBuiltinSpecsDetector" keep-relative-paths="false" name="CDT GCC Built-in Compiler Settings Cross ARM" parameter="${COMMAND} ${FLAGS} ${cross_toolchain_flags} -E -P -v -dD &quot;${INPUTS}&quot;" prefer-non-shared="true">
+			<provider class="org.eclipse.cdt.managedbuilder.language.settings.providers.GCCBuiltinSpecsDetector" console="false" env-hash="893947698641861052" id="ilg.gnuarmeclipse.managedbuild.cross.GCCBuiltinSpecsDetector" keep-relative-paths="false" name="CDT GCC Built-in Compiler Settings Cross ARM" parameter="${COMMAND} ${FLAGS} ${cross_toolchain_flags} -E -P -v -dD &quot;${INPUTS}&quot;" prefer-non-shared="true">
 				<language-scope id="org.eclipse.cdt.core.gcc"/>
 				<language-scope id="org.eclipse.cdt.core.g++"/>
 			</provider>
diff --git a/Debug/src/subdir.mk b/Debug/src/subdir.mk
index 97d5312..cc9bc79 100644
--- a/Debug/src/subdir.mk
+++ b/Debug/src/subdir.mk
@@ -9,7 +9,9 @@ C_SRCS += \
 ../src/PathConfig.c \
 ../src/TimerConfig.c \
 ../src/_write.c \
-../src/config_data.c \
+../src/config_data_first.c \
+../src/config_data_second.c \
+../src/config_data_third.c \
 ../src/delay.c \
 ../src/io.c \
 ../src/it_handlers.c \
@@ -30,7 +32,9 @@ OBJS += \
 ./src/PathConfig.o \
 ./src/TimerConfig.o \
 ./src/_write.o \
-./src/config_data.o \
+./src/config_data_first.o \
+./src/config_data_second.o \
+./src/config_data_third.o \
 ./src/delay.o \
 ./src/io.o \
 ./src/it_handlers.o \
@@ -51,7 +55,9 @@ C_DEPS += \
 ./src/PathConfig.d \
 ./src/TimerConfig.d \
 ./src/_write.d \
-./src/config_data.d \
+./src/config_data_first.d \
+./src/config_data_second.d \
+./src/config_data_third.d \
 ./src/delay.d \
 ./src/io.d \
 ./src/it_handlers.d \
diff --git a/ldscripts/sections.ld b/ldscripts/sections.ld
index 48086cc..3ef13ed 100644
--- a/ldscripts/sections.ld
+++ b/ldscripts/sections.ld
@@ -234,6 +234,50 @@ SECTIONS
     _etext = .;
     __etext = .;
     
+    __config_section_first_start = 	0x0801E800;
+    __config_section_second_start = 0x0801F000;
+    __config_section_third_start =	0x0801F800;
+    
+    __config_section_first_end = __config_section_first_start + 0x7FF;
+    __config_section_second_end = __config_section_second_start + 0x7FF;
+    __config_section_third_end = __config_section_third_start + 0x7FF;
+    
+    .config_section_first __config_section_first_start : ALIGN(4)
+    {
+    	FILL(0xAB)
+
+    	*(.config_section_first) config_data_mode_first = __config_section_first_start;
+    	*(.config_section_first) config_data_basic_first = __config_section_first_start + 0x20;
+    	*(.config_section_first) config_data_wx_sources_first = __config_section_first_start + 0x100;
+    	*(.config_section_first) config_data_umb_first = __config_section_first_start + 0x120;
+    	*(.config_section_first) config_data_rtu_first = __config_section_first_start + 0x140;
+
+		__config_section_first_crc = (__config_section_first_end - 0x4);
+
+    	KEEP(*(.config_section_first))
+    } >FLASH
+    
+    .config_section_second __config_section_second_start : ALIGN(4)
+    {
+    	FILL(0xAC)
+
+
+    	*(.config_section_second) config_data_mode_second = __config_section_second_start;
+    	*(.config_section_second) config_data_basic_second = __config_section_second_start + 0x20;
+    	*(.config_section_second) config_data_wx_sources_second = __config_section_second_start + 0x100;
+    	*(.config_section_second) config_data_umb_second = __config_section_second_start + 0x120;
+    	*(.config_section_second) config_data_rtu_second = __config_section_second_start + 0x140;
+    	
+		__config_section_second_crc = (__config_section_second_end - 0x4);
+    	
+    	KEEP(*(.config_section_second))
+    } >FLASH
+    
+    .config_section_third __config_section_third_start : ALIGN(4)
+    {
+       	KEEP(*(.config_section_third))
+    } >FLASH
+    
     /* MEMORY_ARRAY */
     /*
     .ROarraySection :
diff --git a/src/config_data.c b/src/config_data_first.c
similarity index 93%
rename from src/config_data.c
rename to src/config_data_first.c
index d9e993b..462b965 100644
--- a/src/config_data.c
+++ b/src/config_data_first.c
@@ -43,7 +43,7 @@
 /**
  *
  */
-const config_data_mode_t config_data_mode_first = {
+const config_data_mode_t __attribute__((section(".config_section_first"))) config_data_mode_first = {
 #ifdef _DIGI
 		.digi = 1,
 #else
@@ -109,7 +109,7 @@ const config_data_mode_t config_data_mode_first = {
 /**
  *
  */
-const config_data_basic_t config_data_basic_first = {
+const config_data_basic_t __attribute__((section(".config_section_first"))) config_data_basic_first = {
 		.callsign = _CALL,
 		.ssid = _SSID,
 		.latitude = _LAT,
@@ -168,7 +168,7 @@ const config_data_basic_t config_data_basic_first = {
  * Data sources for different parameters
  *
  */
-const config_data_wx_sources_t config_data_wx_sources_first = {
+const config_data_wx_sources_t __attribute__((section(".config_section_first"))) config_data_wx_sources_first = {
 #ifdef _TEMPERATURE_INTERNAL
 		.temperature = WX_SOURCE_INTERNAL,
 #endif
@@ -233,7 +233,7 @@ const config_data_wx_sources_t config_data_wx_sources_first = {
 /**
  *
  */
-const config_data_umb_t config_data_umb_first = {
+const config_data_umb_t __attribute__((section(".config_section_first"))) config_data_umb_first = {
 #ifdef _UMB_SLAVE_ID
 		.slave_id = _UMB_SLAVE_ID,
 #else
@@ -265,7 +265,7 @@ const config_data_umb_t config_data_umb_first = {
 /**
  *
  */
-const config_data_rtu_t config_data_rtu_first = {
+const config_data_rtu_t __attribute__((section(".config_section_first"))) config_data_rtu_first = {
 		.slave_speed = _RTU_SLAVE_SPEED,
 
 		.slave_parity = _RTU_SLAVE_PARITY,
diff --git a/src/config_data_second.c b/src/config_data_second.c
new file mode 100644
index 0000000..af16b76
--- /dev/null
+++ b/src/config_data_second.c
@@ -0,0 +1,424 @@
+/*
+ * config_data_second.c
+ *
+ *  Created on: Apr 26, 2021
+ *      Author: mateusz
+ */
+
+#include "config_data.h"
+
+#include "station_config.h"
+
+#ifndef _RTU_SLAVE_LENGHT_1
+	#define _RTU_SLAVE_LENGHT_1 0x1
+#endif
+
+#ifndef _RTU_SLAVE_LENGHT_2
+	#define _RTU_SLAVE_LENGHT_2 0x1
+#endif
+
+#ifndef _RTU_SLAVE_LENGHT_3
+	#define _RTU_SLAVE_LENGHT_3 0x1
+#endif
+
+#ifndef _RTU_SLAVE_LENGHT_4
+	#define _RTU_SLAVE_LENGHT_4 0x1
+#endif
+
+#ifndef _RTU_SLAVE_LENGHT_5
+	#define _RTU_SLAVE_LENGHT_5 0x1
+#endif
+
+#ifndef _RTU_SLAVE_LENGHT_6
+	#define _RTU_SLAVE_LENGHT_6 0x1
+#endif
+
+/**
+ *
+ */
+const config_data_mode_t __attribute__((section(".config_section_second"))) config_data_mode_second = {
+#ifdef _DIGI
+		.digi = 1,
+#else
+		.digi = 0,
+#endif
+
+#ifdef _METEO
+		.wx = 1,
+#else
+		.wx = 0,
+#endif
+
+#ifdef _MODBUS_RTU
+		.wx_modbus = 1,
+#else
+		.wx_modbus = 0,
+#endif
+
+#ifdef _MODBUS_RTU
+		.wx_modbus = 1,
+#else
+		.wx_modbus = 0,
+#endif
+
+#ifdef _UMB_MASTER
+		.wx_umb = 1,
+#else
+		.wx_umb = 0,
+#endif
+
+
+#ifdef _VICTRON
+		.victron = 1,
+#else
+		.victron = 0,
+#endif
+
+#ifdef _SENSOR_BME280
+		.wx_ms5611_or_bme = 1,
+#else
+		.wx_ms5611_or_bme = 0,
+#endif
+
+#ifdef _DIGI_ONLY_789
+		.digi_only_ssids = 1,
+#else
+		.digi_only_ssids = 0,
+#endif
+
+#ifdef _DIGI_VISCOUS
+		.digi_viscous = 1,
+#else
+		.digi_viscous = 0,
+#endif
+
+#ifdef _DIGI_VISCOUS_DEALY
+		.digi_viscous_delay_sec = _DIGI_VISCOUS_DEALY
+#else
+		.digi_viscous_delay_sec = 3
+#endif
+};
+
+/**
+ *
+ */
+const config_data_basic_t __attribute__((section(".config_section_second"))) config_data_basic_second = {
+		.callsign = _CALL,
+		.ssid = _SSID,
+		.latitude = _LAT,
+		.longitude = _LON,
+#if (_LATNS == 'N')
+		.zero_to_n_one_to_s = 0,
+#else
+		.zero_to_n_one_to_s = 1,
+#endif
+
+#if (_LONWE == 'E')
+		.zero_to_e_one_to_w = 0,
+#else
+		.zero_to_e_one_to_w = 1,
+#endif
+
+		.comment = _COMMENT,
+
+#ifdef _SYMBOL_DIGI
+		.symbol = 0,
+#endif
+#ifdef _SYMBOL_WIDE1_DIGI
+		.symbol = 1,
+#endif
+#ifdef _SYMBOL_HOUSE
+		.symbol = 2,
+#endif
+#ifdef _SYMBOL_RXIGATE
+		.symbol = 3,
+#endif
+#ifdef _SYMBOL_IGATE
+		.symbol = 4,
+#endif
+
+#if defined(_WIDE1_PATH)
+		.path_type = 1,
+#elif defined(_WIDE21_PATH)
+		.path_type = 2,
+#else
+		.path_type = 0,
+#endif
+
+		.wx_transmit_period = _WX_INTERVAL,
+
+		.beacon_transmit_period = _BCN_INTERVAL,
+
+#ifdef _BCN_ON_STARTUP
+		.beacon_at_bootup = 1
+#else
+		.beacon_at_bootup = 0
+#endif
+
+};
+
+/**
+ * Data sources for different parameters
+ *
+ */
+const config_data_wx_sources_t __attribute__((section(".config_section_second"))) config_data_wx_sources_second = {
+#ifdef _TEMPERATURE_INTERNAL
+		.temperature = WX_SOURCE_INTERNAL,
+#endif
+#ifdef _TEMPERATURE_UMB
+		.temperature = WX_SOURCE_UMB,
+#endif
+#ifdef _TEMPERATURE_RTU
+		.temperature = WX_SOURCE_RTU,
+#endif
+#ifdef _TEMPERATURE_DAVIS
+		.temperature = WX_SOURCE_DAVIS_SERIAL,
+#endif
+
+
+
+#ifdef _PRESSURE_INTERNAL
+		.pressure = WX_SOURCE_INTERNAL,
+#endif
+#ifdef _PRESSURE_UMB
+		.pressure = WX_SOURCE_UMB,
+#endif
+#ifdef _PRESSURE_RTU
+		.pressure = WX_SOURCE_RTU,
+#endif
+#ifdef _PRESSURE_DAVIS
+		.pressure = WX_SOURCE_DAVIS_SERIAL,
+#endif
+
+
+#ifdef _HUMIDITY_INTERNAL
+		.humidity = WX_SOURCE_INTERNAL,
+#endif
+#ifdef _HUMIDITY_UMB
+		.humidity = WX_SOURCE_UMB,
+#endif
+#ifdef _HUMIDITY_RTU
+		.humidity = WX_SOURCE_RTU,
+#endif
+#ifdef _HUMIDITY_DAVIS
+		.humidity = WX_SOURCE_DAVIS_SERIAL,
+#endif
+
+
+
+#ifdef _WIND_INTERNAL
+		.wind = WX_SOURCE_INTERNAL
+#endif
+#ifdef _WIND_UMB
+		.wind = WX_SOURCE_UMB
+#endif
+#ifdef _WIND_RTU
+		.wind = WX_SOURCE_RTU
+#endif
+#ifdef _WIND_FULL_RTU
+		.wind = WX_SOURCE_FULL_RTU
+#endif
+#ifdef _WIND_DAVIS
+		.wind = WX_SOURCE_DAVIS_SERIAL
+#endif
+};
+
+/**
+ *
+ */
+const config_data_umb_t __attribute__((section(".config_section_second"))) config_data_umb_second = {
+#ifdef _UMB_SLAVE_ID
+		.slave_id = _UMB_SLAVE_ID,
+#else
+		.slave_id = 0,
+#endif
+
+#ifdef _UMB_SLAVE_CLASS
+		.slave_class = _UMB_SLAVE_CLASS,
+#else
+		.slave_class = 0,
+#endif
+
+#if defined (_UMB_SLAVE_ID) && defined (_UMB_SLAVE_CLASS)
+		.channel_windspeed = _UMB_CHANNEL_WINDSPEED,
+		.channel_wingsusts = _UMB_CHANNEL_WINDGUSTS,
+		.channel_winddirection = _UMB_CHANNEL_WINDDIRECTION,
+		.channel_temperature = _UMB_CHANNEL_TEMPERATURE,
+		.channel_qnh = _UMB_CHANNEL_QFE
+#else
+		.channel_windspeed = 0xFFFF,
+		.channel_wingsusts = 0xFFFF,
+		.channel_winddirection = 0xFFFF,
+		.channel_temperature = 0xFFFF,
+		.channel_qfe = 0xFFFF
+#endif
+};
+
+
+/**
+ *
+ */
+const config_data_rtu_t __attribute__((section(".config_section_second"))) config_data_rtu_second = {
+		.slave_speed = _RTU_SLAVE_SPEED,
+
+		.slave_parity = _RTU_SLAVE_PARITY,
+
+		.slave_stop_bits = _RTU_SLAVE_STOP_BITS,
+
+#ifdef _RTU_SLAVE_FULL_WIND_DATA
+		.use_full_wind_data = 1,
+#else
+		.use_full_wind_data = 0,
+#endif
+
+		// sources
+#ifdef _RTU_SLAVE_TEMPERATURE_SOURCE
+		.temperature_source = _RTU_SLAVE_TEMPERATURE_SOURCE,
+#else
+		.temperature_source = 0,
+#endif
+
+#ifdef _RTU_SLAVE_HUMIDITY_SOURCE
+		.humidity_source = _RTU_SLAVE_HUMIDITY_SOURCE,
+#else
+		.humidity_source = 0,
+#endif
+
+#ifdef _RTU_SLAVE_PRESSURE_SOURCE
+		.pressure_source = _RTU_SLAVE_PRESSURE_SOURCE,
+#else
+		.pressure_source = 0,
+#endif
+
+#ifdef _RTU_SLAVE_WIND_DIRECTION_SORUCE
+		.wind_direction_source = _RTU_SLAVE_WIND_DIRECTION_SORUCE,
+#else
+		.wind_direction_source = 0,
+#endif
+
+#ifdef _RTU_SLAVE_WIND_SPEED_SOURCE
+		.wind_speed_source = _RTU_SLAVE_WIND_SPEED_SOURCE,
+#else
+		.wind_speed_source = 0,
+#endif
+
+#ifdef _RTU_SLAVE_WIND_GUSTS_SOURCE
+		.wind_gusts_source = _RTU_SLAVE_WIND_GUSTS_SOURCE,
+#else
+		.wind_gusts_source = 0,
+#endif
+
+		// channel 1
+		.slave_1_bus_address = _RTU_SLAVE_ID_1,
+
+		.slave_1_function = _RTU_SLAVE_FUNC_1,
+
+		.slave_1_register_address = _RTU_SLAVE_ADDR_1,
+
+		.slave_1_lenght = _RTU_SLAVE_LENGHT_1,
+
+		.slave_1_scaling_a = _RTU_SLAVE_SCALING_A_1,
+
+		.slave_1_scaling_b = _RTU_SLAVE_SCALING_B_1,
+
+		.slave_1_scaling_c = _RTU_SLAVE_SCALING_C_1,
+
+		.slave_1_scaling_d = _RTU_SLAVE_SCALING_D_1,
+
+		.slave_1_unsigned_signed = 0,		// 0 - unsigned
+
+		// channel 2
+		.slave_2_bus_address = _RTU_SLAVE_ID_2,
+
+		.slave_2_function = _RTU_SLAVE_FUNC_2,
+
+		.slave_2_register_address = _RTU_SLAVE_ADDR_2,
+
+		.slave_2_lenght = _RTU_SLAVE_LENGHT_2,
+
+		.slave_2_scaling_a = _RTU_SLAVE_SCALING_A_2,
+
+		.slave_2_scaling_b = _RTU_SLAVE_SCALING_B_2,
+
+		.slave_2_scaling_c = _RTU_SLAVE_SCALING_C_2,
+
+		.slave_2_scaling_d = _RTU_SLAVE_SCALING_D_2,
+
+		.slave_2_unsigned_signed = 0,
+
+		// channel 3
+		.slave_3_bus_address = _RTU_SLAVE_ID_3,
+
+		.slave_3_function = _RTU_SLAVE_FUNC_3,
+
+		.slave_3_register_address = _RTU_SLAVE_ADDR_3,
+
+		.slave_3_lenght = _RTU_SLAVE_LENGHT_3,
+
+		.slave_3_scaling_a = _RTU_SLAVE_SCALING_A_3,
+
+		.slave_3_scaling_b = _RTU_SLAVE_SCALING_B_3,
+
+		.slave_3_scaling_c = _RTU_SLAVE_SCALING_C_3,
+
+		.slave_3_scaling_d = _RTU_SLAVE_SCALING_D_3,
+
+		.slave_3_unsigned_signed = 0,
+
+		// channel 4
+		.slave_4_bus_address = _RTU_SLAVE_ID_4,
+
+		.slave_4_function = _RTU_SLAVE_FUNC_4,
+
+		.slave_4_register_address = _RTU_SLAVE_ADDR_4,
+
+		.slave_4_lenght = _RTU_SLAVE_LENGHT_4,
+
+		.slave_4_scaling_a = _RTU_SLAVE_SCALING_A_4,
+
+		.slave_4_scaling_b = _RTU_SLAVE_SCALING_B_4,
+
+		.slave_4_scaling_c = _RTU_SLAVE_SCALING_C_4,
+
+		.slave_4_scaling_d = _RTU_SLAVE_SCALING_D_4,
+
+		.slave_4_unsigned_signed = 0,
+
+		// channel 5
+		.slave_5_bus_address = _RTU_SLAVE_ID_5,
+
+		.slave_5_function = _RTU_SLAVE_FUNC_5,
+
+		.slave_5_register_address = _RTU_SLAVE_ADDR_5,
+
+		.slave_5_lenght = _RTU_SLAVE_LENGHT_5,
+
+		.slave_5_scaling_a = _RTU_SLAVE_SCALING_A_5,
+
+		.slave_5_scaling_b = _RTU_SLAVE_SCALING_B_5,
+
+		.slave_5_scaling_c = _RTU_SLAVE_SCALING_C_5,
+
+		.slave_5_scaling_d = _RTU_SLAVE_SCALING_D_5,
+
+		.slave_5_unsigned_signed = 0,
+
+		// channel 6
+		.slave_6_bus_address = _RTU_SLAVE_ID_6,
+
+		.slave_6_function = _RTU_SLAVE_FUNC_6,
+
+		.slave_6_register_address = _RTU_SLAVE_ADDR_6,
+
+		.slave_6_lenght = _RTU_SLAVE_LENGHT_6,
+
+		.slave_6_scaling_a = _RTU_SLAVE_SCALING_A_6,
+
+		.slave_6_scaling_b = _RTU_SLAVE_SCALING_B_6,
+
+		.slave_6_scaling_c = _RTU_SLAVE_SCALING_C_6,
+
+		.slave_6_scaling_d = _RTU_SLAVE_SCALING_D_6,
+
+		.slave_6_unsigned_signed = 0
+};
diff --git a/src/config_data_third.c b/src/config_data_third.c
new file mode 100644
index 0000000..2a4dc6f
--- /dev/null
+++ b/src/config_data_third.c
@@ -0,0 +1,9 @@
+/*
+ * config_data_third.c
+ *
+ *  Created on: Apr 26, 2021
+ *      Author: mateusz
+ */
+
+const int __attribute__((section(".config_section_third"))) dummy = 0xDEADBEEF;
+