Regarding buttonless dfu bootloader example in SDK12

[Sachin bejgamwar]

Hii,

We are using currently nRF SDK12 and nrfutil for performing DFU over ble. we are able to do it by pressing button on  nrf51822 Dk kit at time of restart and putting it in to Bootloader mode.

Now we trying to implement out buttonless DFU. I am using example given in nRF sdk12 (experimental buttonless DFU)  and nrfutil for performing OTA with ble. but when i try to perform DFU i get following error.(CCCD not found please find attached screenshot of the error)

[Edvin]

By the way, can you try to perform the DFU process with your buttonless DFU with nRF Connect? Just connect to it, and press the DFU icon near the top of the box from my screenshot, and select the dfu package.

 

BR,

Edvin

[Sachin bejgamwar]

Hi, i think i am doing a wrong procedure to do a Button less DFU. What i am currently doing is -

1)earasing the device completely

2)updating nrf51822 softdevice

3)updating bootloader with compiled hex file of example given in SDK12 ble peripheral (experimental buttonless dfu)

4) then i try to connect it with nrfutil with command that i was giving it to perform DFU .

I think i dont need to update the bootloader with that example hex file, if that so please let me know the steps to perform buttonless DFU process.

[Edvin]

Hello,

The buttonless dfu example doesn't contain a bootloader. You need to program the bootloader from examples\dfu\bootloader_secure

Then you can either update to the buttonless_dfu example via the DFU service via nRF Connect, or program the hex  file from the buttonless_dfu example, in addition to the bootloader settings .hex file which you can generate from the following guide:

http://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.tools%2Fdita%2Ftools%2Fnrfutil%2Fnrfutil_settings_generate_display.html

 

I suggest you try the following:

1) erase board: nrfjprog -e

2) program softdevice: nrfjprog --program <path_to_softdevice_s132.hex> --verify

3) program bootloader generated from examples\dfu\bootloader_secure: nrfjprog --program <path to hex file> --verify

4) reset the device: nrfjprog --reset

5) connect to DfuTarg in nRF Connect and update via the DFU service.

 

Let me know if you get stuck at one point.

 

BR,

Edvin

[Sachin bejgamwar]

Hii ,thanks for your reply... i am able to proceed all of this step without any problem... now what i want to do is to- enter DFU bootloader mode from the application... . right now i need to press down the button at time of restart to put my device in to bootloader mode. please tell me regarding this. thank you.

[Edvin]

If you are running the buttonless example, you use BLE to enter bootloader mode.

Connect to the device, like you did before, but it should now be advertising with the name "buttonless_dfu". You should be able to select the DFU option like before. Do you see the device advertising after the first DFU update?

BR,

Edvin

[Sachin bejgamwar]

Yes device is advertising after getting DFU update. but to put it again in DFU mode we need to press button while restarting. we are not using buttonless DFU right now. what we need is -switching to bootloader without a system reset nrf51822. so that we can again put our device in to DFU bootloader mode

[Edvin]

Ok. Do you intend to use buttonless DFU? You need some way of entering bootloader mode within your application. However, entering bootloader mode requires a reset, but you can do this in application. You don't need to manually turn the device off and on.

 

Best regards,

Edvin