regarding to buttonless DFU

[djqtsg]

Hi,

I have tried buttonless DFU in SDK 12, for which I have a few questions

(1) Is bootloader not needed if I use Buttonless DFU Template Application? However, SoftDevice is still required.

(2) I have to combine my own application with the Buttonless DFU Template Application. Is it correct?

For the above two questions, see answers below.

However, I failed at the last step. Please see my test steps and the problem in the attached word document.DFU trial SDK 12.docx

[djqtsg]

after reading through the online document, I have come to know that

(1) bootloader is needed

(2) I can add Buttonless Secure DFU Service to my application to achieve buttonless DFU.

Following this link, I managed to let the device reboot from "Nordic_Template" app to bootloader mode "DfuTarg".

The tick is that we need to add

char_md.char_props.write = 1;

in ble_dfu.c () as discussed in here

[Hung Bui]

Your understanding is correct.

[djqtsg]

HI Hung,

I' followed your blog to try DFU. I have encountered problem:

Before DFU, device shows "DfuTarg" during BLE scan; device was loaded with bootloader (bootloader_secure), and app (experimental_ble_app_buttonless_dfu) through Keil; SoftDevice through nRFStudio.

once I used DFU to flash an application zip file(experimental_ble_app_buttonless_dfu) into HW, it becomes "Nordic_Template", for which I cannot do DFU anymore. How to switch between "Nordic_Template" and "DfuTarg"?

[Hung Bui]

You hold button 4 on the DK and press reset. Have a look at step 6 in the Testing section here.

[djqtsg]

OK. I see.

But it's buttonless, isn't it? How to switch without button?