I have the BMD350 from Rigado. I am using Segger embedded studio with SDK v 15.2.0
I have the buttonless DFU working with my custom application that has the buttonless DFU and the nordic uart service (NUS).
I would like to use the app data section of flash that does not get written during a DFU. I would like to store application configuration data there.
I am having a hard time finding clear examples of doing this. I have read some topics mentioning the "pstorage_platform", the "device manager",
and have seen some hard coded addresses. Also have read many topics about the "dfu_types" to edit the DFU_APP_DATA_RESERVED value.
This has not lead me to a path to get started.
I'm looking in the "flash_placement.xml" file and do not see a section dedicated to "app data" or "user data" or "pstorage", so I'm thinking it's not as simple as defining a C array or structure
with the "SECTION" attribute in the linker?
If you could point me to an example of using this application data section of flash or list a quick step by step getting started that would be great.
Below is the segger flash_placement.xml for my project.
<!DOCTYPE Linker_Placement_File>
<Root name="Flash Section Placement">
<MemorySegment name="FLASH" start="$(FLASH_PH_START)" size="$(FLASH_PH_SIZE)">
<ProgramSection load="no" name=".reserved_flash" start="$(FLASH_PH_START)" size="$(FLASH_START)-$(FLASH_PH_START)" />
<ProgramSection alignment="0x100" load="Yes" name=".vectors" start="$(FLASH_START)" />
<ProgramSection alignment="4" load="Yes" name=".init" />
<ProgramSection alignment="4" load="Yes" name=".init_rodata" />
<ProgramSection alignment="4" load="Yes" name=".text" />
<ProgramSection alignment="4" keep="Yes" load="Yes" name=".sdh_ble_observers" inputsections="*(SORT(.sdh_ble_observers*))" address_symbol="__start_sdh_ble_observers" end_symbol="__stop_sdh_ble_observers" />
<ProgramSection alignment="4" keep="Yes" load="Yes" name=".sdh_soc_observers" inputsections="*(SORT(.sdh_soc_observers*))" address_symbol="__start_sdh_soc_observers" end_symbol="__stop_sdh_soc_observers" />
<ProgramSection alignment="4" keep="Yes" load="Yes" name=".pwr_mgmt_data" inputsections="*(SORT(.pwr_mgmt_data*))" address_symbol="__start_pwr_mgmt_data" end_symbol="__stop_pwr_mgmt_data" />
<ProgramSection alignment="4" keep="Yes" load="Yes" name=".log_const_data" inputsections="*(SORT(.log_const_data*))" address_symbol="__start_log_const_data" end_symbol="__stop_log_const_data" />
<ProgramSection alignment="4" keep="Yes" load="Yes" name=".sdh_stack_observers" inputsections="*(SORT(.sdh_stack_observers*))" address_symbol="__start_sdh_stack_observers" end_symbol="__stop_sdh_stack_observers" />
<ProgramSection alignment="4" keep="Yes" load="Yes" name=".sdh_req_observers" inputsections="*(SORT(.sdh_req_observers*))" address_symbol="__start_sdh_req_observers" end_symbol="__stop_sdh_req_observers" />
<ProgramSection alignment="4" keep="Yes" load="Yes" name=".sdh_state_observers" inputsections="*(SORT(.sdh_state_observers*))" address_symbol="__start_sdh_state_observers" end_symbol="__stop_sdh_state_observers" />
<ProgramSection alignment="4" keep="Yes" load="Yes" name=".log_backends" inputsections="*(SORT(.log_backends*))" address_symbol="__start_log_backends" end_symbol="__stop_log_backends" />
<ProgramSection alignment="4" keep="Yes" load="Yes" name=".nrf_balloc" inputsections="*(.nrf_balloc*)" address_symbol="__start_nrf_balloc" end_symbol="__stop_nrf_balloc" />
<ProgramSection alignment="4" keep="Yes" load="No" name=".nrf_sections" address_symbol="__start_nrf_sections" />
<ProgramSection alignment="4" keep="Yes" load="Yes" name=".log_dynamic_data" inputsections="*(SORT(.log_dynamic_data*))" runin=".log_dynamic_data_run"/>
<ProgramSection alignment="4" keep="Yes" load="Yes" name=".log_filter_data" inputsections="*(SORT(.log_filter_data*))" runin=".log_filter_data_run"/>
<ProgramSection alignment="4" keep="Yes" load="Yes" name=".fs_data" inputsections="*(.fs_data*)" runin=".fs_data_run"/>
<ProgramSection alignment="4" load="Yes" name=".dtors" />
<ProgramSection alignment="4" load="Yes" name=".ctors" />
<ProgramSection alignment="4" load="Yes" name=".rodata" />
<ProgramSection alignment="4" load="Yes" name=".ARM.exidx" address_symbol="__exidx_start" end_symbol="__exidx_end" />
<ProgramSection alignment="4" load="Yes" runin=".fast_run" name=".fast" />
<ProgramSection alignment="4" load="Yes" runin=".data_run" name=".data" />
<ProgramSection alignment="4" load="Yes" runin=".tdata_run" name=".tdata" />
</MemorySegment>
<MemorySegment name="RAM" start="$(RAM_PH_START)" size="$(RAM_PH_SIZE)">
<ProgramSection load="no" name=".reserved_ram" start="$(RAM_PH_START)" size="$(RAM_START)-$(RAM_PH_START)" />
<ProgramSection alignment="0x100" load="No" name=".vectors_ram" start="$(RAM_START)" address_symbol="__app_ram_start__"/>
<ProgramSection alignment="4" keep="Yes" load="No" name=".nrf_sections_run" address_symbol="__start_nrf_sections_run" />
<ProgramSection alignment="4" keep="Yes" load="No" name=".log_dynamic_data_run" address_symbol="__start_log_dynamic_data" end_symbol="__stop_log_dynamic_data" />
<ProgramSection alignment="4" keep="Yes" load="No" name=".log_filter_data_run" address_symbol="__start_log_filter_data" end_symbol="__stop_log_filter_data" />
<ProgramSection alignment="4" keep="Yes" load="No" name=".fs_data_run" address_symbol="__start_fs_data" end_symbol="__stop_fs_data" />
<ProgramSection alignment="4" keep="Yes" load="No" name=".nrf_sections_run_end" address_symbol="__end_nrf_sections_run" />
<ProgramSection alignment="4" load="No" name=".fast_run" />
<ProgramSection alignment="4" load="No" name=".data_run" />
<ProgramSection alignment="4" load="No" name=".tdata_run" />
<ProgramSection alignment="4" load="No" name=".bss" />
<ProgramSection alignment="4" load="No" name=".tbss" />
<ProgramSection alignment="4" load="No" name=".non_init" />
<ProgramSection alignment="4" size="__HEAPSIZE__" load="No" name=".heap" />
<ProgramSection alignment="8" size="__STACKSIZE__" load="No" place_from_segment_end="Yes" name=".stack" address_symbol="__StackLimit" end_symbol="__StackTop"/>
<ProgramSection alignment="8" size="__STACKSIZE_PROCESS__" load="No" name=".stack_process" />
</MemorySegment>
<MemorySegment name="uicr_bootloader_start_address" start="0x10001014" size="0x4">
<ProgramSection alignment="4" keep="Yes" load="Yes" name=".uicr_bootloader_start_address" address_symbol="__start_uicr_bootloader_start_address" end_symbol="__stop_uicr_bootloader_start_address" start = "0x10001014" size="0x4" />
</MemorySegment>
</Root>