Hard Fault in ble_dfu_unbounded.c from SDK 17.1.0 (secure bootloader)

Question

Hi! 
 I'm using some common bootloader code for different devices. One of my devices is a bit different, with an LED library that caused me to increase the BL size in the linker. This is not happening on my other devices, which is why I mentioned the different linker. 2 of them also have a modified linker for a small LCD driver. Those work great! 
 When I debug the application jumping to bootloader with NRF DFU IOS app, I get a hard fault in nrf_dfu_set_adv_name(). Name should be "DfuTarg", from my bootloader make file 
 
 CFLAGS += -DDEVICE_NAME=\"DfuTarg\" -DNRF_DFU_BLE_ADV_NAME=\"DfuTarg\"

CFLAGS += -DNRF_DFU_DEBUG_VERSION 
 CFLAGS += -DNRF_DFU_SETTINGS_VERSION=2 
 CFLAGS += -DNRF_DFU_SVCI_ENABLED

In my application makefile

CFLAGS += -DNRF_DFU_SVCI_ENABLED -DNRF_DFU_TRANSPORT_BLE=1 
 CFLAGS += -DNRF_DFU_SETTINGS_VERSION=2 
 As you can see here, Dfu31280 is showing up instead of DfuTarg,

Here is the call stack, HardFault is where the PC indicates inside NMI_Handler

Vidar Berg · Accepted Answer

Hello, 
 When I debug the application jumping to bootloader with NRF DFU IOS app, I get a hard fault in nrf_dfu_set_adv_name(). Name should be "DfuTarg", from my bootloader make file 
 The iOS DFU lib will send the " Set advertisement name " command to change the advertisement name to be used in DFU mode before sending the " Enter DFU mode" command. Setting a unique adv. name (like "Dfu31280" in this case) is how the phone is automatically able to recconnect to the device after it has entered DFU mode. On android you don't have to do this as it allows you to specify which BLE address you want to connect to. 
 
 Does your application call ble_dfu_buttonless_async_svci_init() at the beginning of main()? If not the function pointer for nrf_dfu_set_adv_name() will not be initialized correctly which will result in a fault exception when called. 
 Best regards, 
 Vidar

Hard Fault in ble_dfu_unbounded.c from SDK 17.1.0 (secure bootloader)

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