Using app_with_dfu jump to bootloader.

[Coldson]

Hi all:

I use the softdevice 2.0.0 and compile bootloader example with "dual bank" on the nrf52 DK,

Running a system that can using DFU from app then jump to bootloader as example hrm did.

After I have a deep study it, I found out that:

1. DFU will sign a value "BOOTLOADER_DFU_START" into "GPREGRET".

2. it will restart using "bootloader_util_app_start(NRF_UICR->NRFFW[0]);" into bootloader.

3. While into bootloader, the main function will check the sign on "GPREGRET"(bool app_reset = (NRF_POWER->GPREGRET == BOOTLOADER_DFU_START);)

4. The DFU flow just as the picture below.

5. And the problem is: it will stuck at dfu_ble_svc_peer_data_set(&m_peer_data); --> dfu_app_handler.c line 110

6. the nrftool DFU on my iPhone will show:

7. If I mark the step 5. line 110, and it will went to the function: "bootloader_util_app_start(NRF_UICR->NRFFW[0]);", but nrftool app on my iPhone still show "Enabling DFU Bootloader"

I think that did not really jump into bootloader, but why? What should I check?

Please correct me if I misunderstanding the DFU flow.

Thx for everyone willing to help me solve this problem.

Update 2016/06/27:

There're no return error code after that break point: err_code = dfu_ble_svc_peer_data_set(&m_peer_data);

and the variable m_peer_data is:

[Hung Bui]

Hi Coldson,

Which error code you got at step #4 ? you may want to add the break point after the call (one line after )

Did you use device manager in your application ? What did you feed to the function as m_peer_data ?

[Coldson]

Hi, Hung Bui, there're no return after that break point. And, Yes, I use the device manager in my application, I will check what I feed to that function as m_peer_data.

[Hung Bui]

@Coldson: That what I suggested, don't add breakpoint on that function and the step over it. Add the breakpoint after the function instead. Or do you get hardfault when calling that ?

[Coldson]

@Hung Bui, I add break point there because the whole flow will not end at the function :"bootloader_util_app_start(NRF_UICR->NRFFW[0]);", and jump to bootloader, so I add breakpoint to find which code are going wrong, I will keep find the solution. I will share the root cause in this topic if there're any progress.

[Hung Bui]

Hi Coldson, I assume that you have flashed the bootloader (the \examples\dfu\bootloader project) in addition to your application.

The dfu_ble_svc_peer_data_set(&m_peer_data); is an SVC call, and the code is in the bootloader not in the application, you won't be able to step through it, please add a break point after that call.

Please let me know what happen if you add breakpoint at line 111 instead of line 110.