problem with combining peripheral and central DFU with FDS

[adriand]

Hello,

for my project I'm using: SDK11, s130, nrf51 (nrf51822-QFAC), central and peripheral roles, DFU.

I've managed to have both peripheral and central roles with DFU with solution taken from this post: devzone.nordicsemi.com/.../

I wanted to add FDS functionality for storing some data in flash, so I've followed Nordic's example: github.com/.../nRF52-fds-example

both solutions work great separately, but I have problems when I try to mix them, whilst trying to manage FDS write operation. Here is my main:

int main(void)
{	
    ret_code_t err_code;
    bool       erase_bonds=true;
    bool       app_dfu = (NRF_POWER->GPREGRET == BOOTLOADER_DFU_END);
    
    if (app_dfu)
    {
       NRF_POWER->GPREGRET = 0;
    }
    
    // initializations..
    ble_stack_init();
    peer_manager_init(erase_bonds, app_dfu);
    db_discovery_init();
    gap_params_init();
    services_init();
    
    // adding FDS for custom use
    err_code = fds_test_init();  //  OK, fs callback came
    nrf_delay_ms(100);
    APP_ERROR_CHECK(err_code);		
	
    err_code = fds_test_find_and_delete(); // OK, fs callback came
    APP_ERROR_CHECK(err_code);
    err_code = fds_test_write();  // <--- CRASH Here
    APP_ERROR_CHECK(err_code);
    //wait until the write is finished. 
    while (write_flag==0);
    fds_read();

    advertising_start();	

    while(1) { }
}

fds_test_init() and fds_test_find_and_delete() return NRF_SUCCESS and fds_test_write() doesn't return anything just crashes somewhere and nRF resets.

Settings from fds_config.h are defaults. For dual bank bootloader I used code from example located here: nRF5_SDK_11.0.0\examples\dfu\bootloader\pca10028\dual_bank_ble_s130\arm5_no_packs

Another try:

I also tried to use just Flash Storage: infocenter.nordicsemi.com/index.jsp and again, without bootloader it works fine: I store 0xDEADBEAF and I'm able to read this value. When I upload application by DFU (so bootloader is flashed) then storing doesn't work, I store 0xDEADBEEF but when read value from p_start_addr I get 0x0.

I printed start and end addresses:

 LOG_INFO("addr start: 0x%X", fs_config.p_start_addr);
 LOG_INFO("addr end: 0x%X", fs_config.p_end_addr);

and I've got:

addr start: 0x3B000

addr end: 0x3B400

My appliaction size is 63276B.

Another thing I observed: my appliaction size (with debug on) is 63276B, when I turn off debug size is shrink to 49716B and then there is no problem, I'm able to read proper value after uploading (by OTA DFU) application. However, the start and end addresses are the same as above. Maybe it is somehow messed up with bootloader (which starts at 0x3C000).

any ideas what could be wrong?

Thanks!

[Ole Bauck]

Most likely the reset is because of an error condition, try to define DEBUG in the preprocessor symbols and see if the application stops and if so where the error came from and what error code it is. See this: devzone.nordicsemi.com/.../

You can also try to define DFU_APP_DATA_RESERVED as f.ex. 0x400 in the bootloader project and see if it helps, see this: infocenter.nordicsemi.com/.../bledfu_memory_appdata.html

[adriand]

ok, most likely defining DFU_APP_DATA_RESERVED was the case. I preserved 0x400 and now it works fine with FDS :-) when I debug it before I was getting error 0x03 (internal error). Thanks!