Issues with Buttonless DFU added to existing project

[Eduardo Garcia]

Hello:

We have a BLE project running on the BMD-300 from Rigado for which we want to add BLE DFU functionality. I am basing our development on the "ble_app_buttonless_dfu" project as well as the "secure_dfu_ble" for the bootloader. We are using NRF SDK 14.0.0 and IAR for our development. I have followed the great tutorial at "https://devzone.nordicsemi.com/b/blog/posts/getting-started-with-nordics-secure-dfu-bootloader" to generate the bootloader, bootloader options for application, merge bootloader+bootloader options, generate application,and load them up (also SD) with NRF GO. I set up the RTT logger on the main application.

I erase the chip, then I program the SD, then the bootloader, and then the application, and reset power. The unit always seems to be stuck in PC 0x13d6e of SoftDevice. Since it is a Hex I have no idea what it is doing there! I always have to attach to the running target and hit reset for the device to start performing properly. 

I was having issues with the bootloader not setting the vector table correctly to the app, so when I initialized my other HW the interrupts were getting sent to the bootloader!

To remedy this, I added a call to "nrf_dfu_svci_vector_table_unset()" at the start of the program.

However, now I am getting an NRF_ERROR_INVALID_STATE error on "sd_softdevice_enable()" when I initialize the stack (on ble_stack_init() ).

How is the correct way to add the Buttonless DFU functionality to the device? Is there an order of function that I should follow? should the DFU initialization happen before the HW initialization so the code sets up the correct vector table?

If you could provide any guidance I would be very grateful! I have spend too much time on this.

Thanks!

[Eduardo Garcia]

I solved a minor issue, the setting for the bootloader button on the "secure_dfu_ble" example was set up incorrectly, so maybe that was the issue with the need to reset multiple times until it worked. The main issue, however, is still present!

I tested using the "ble_app_buttonless_dfu" application to upload my application and the upload works. However it still crashes on sd_softdevice_enable() with an NRF_ERROR_INVALID_STATE  error.

Can it be that the stack is already initialized by the bootloader and when it enters my code and initializes again I get this error?I am not sure what the issue is; I see that the "ble_app_buttonless_dfu" example initializes the BLE stack very early on and it does not de-initialize it. I am doing the same thing. 

My code in main.c (needs some cleanup...):

  int main(void)
{
int32_t err_code = 0;
    int32_t task_error = 0;
   
    
    nrf_delay_ms(1000); //wait after power up
    
    err_code  = NRF_LOG_INIT(NULL);
    NRF_LOG_DEFAULT_BACKENDS_INIT();
    //nrf_dfu_svci_vector_table_unset();
    NRF_LOG_INFO("Hello!");
    NRF_LOG_FLUSH();
    SEGGER_RTT_WriteString(0, "RTT initialized\n");
     
     BLE_init(); //Chrashes inside here
     ...
     }

Code inside BLE_Init

int32_t BLE_init(void)
{
    bool erase_bonds;
    uint32_t err_code;

    // Initialize
    ble_stack_init(); //Crashes inside here
    err_code = app_timer_init();
    //...
    }

Crashes on "err_code = nrf_sdh_enable_request();" with a return error of NRF_ERROR_INVALID_STATE.

Thanks