regarding to buttonless DFU

RE: regarding to buttonless DFU

djqtsg — Fri, 08 Sep 2017 07:50:56 GMT

APP:INFO:Indication for BLE_DFU is enabled

that's the only message I saw in UART log.

RE: regarding to buttonless DFU

tesc — Thu, 07 Sep 2017 13:38:14 GMT

From the nRF Connect log I see that you are successfully putting the target in DFU mode (as notifications are successfully enabled on the DFU control point characteristic) but then it stops.

What does the log say from the DFU target?

RE: regarding to buttonless DFU

Hung Bui — Mon, 04 Sep 2017 07:22:08 GMT

Please edit your question and attach the file in

RE: regarding to buttonless DFU

djqtsg — Mon, 04 Sep 2017 04:42:49 GMT

I have drafted a word file with detailed steps. How can I upload it here?

RE: regarding to buttonless DFU

Hung Bui — Thu, 31 Aug 2017 15:20:55 GMT

When you want to share a link from info center, it's a bit tricky that you need to right click on the bookmarks on the left hand side and copy the link, not by copy the URL bar on the top. If you click you link you share above it's not possible to know which guide you followed.

Btw, have you flashed the bootloader when you test buttonless ?

Please list your steps when you test.

RE: regarding to buttonless DFU

djqtsg — Thu, 31 Aug 2017 10:18:12 GMT

D 17:46:50.052 [DFU] gatt.setCharacteristicNotification(8e400001-f315-4f60-9fb8-838830daea50, true) D 17:46:50.052 [DFU] gatt.writeDescriptor(00002902-0000-1000-8000-00805f9b34fb, value=0x01-00) I 17:46:50.204 [DFU] Data written to descr.8e400001-f315-4f60-9fb8-838830daea50, value (0x): 01-00 V 17:46:50.204 [DFU] Notifications enabled for 8e400001-f315-4f60-9fb8-838830daea50 A 17:46:50.204 [DFU] Notifications enabled D 17:46:50.204 [DFU] wait(1000) V 17:46:51.156 [DFU] Writing to characteristic 8e400001-f315-4f60-9fb8-838830daea50 D 17:46:51.156 [DFU] gatt.writeCharacteristic(8e400001-f315-4f60-9fb8-838830daea50)

the uploading just stuck there, never got finished

RE: regarding to buttonless DFU

djqtsg — Thu, 31 Aug 2017 10:18:00 GMT

by following this (infocenter.nordicsemi.com/index.jsp, I made a step further:

Please see the log msg of nRF Connect:

V 17:46:48.165 [DFU] Connecting to DFU target...
 D 17:46:48.231 [DFU] gatt = device.connectGatt(autoConnect = false)
 I 17:46:48.534 [DFU] Connected to C1:17:F7:AF:0C:7C
 V 17:46:48.534 [DFU] Discovering services...
 D 17:46:48.534 [DFU] gatt.discoverServices()
 D 17:46:48.534 [Broadcast] Action received: android.bluetooth.device.action.ACL_CONNECTED
 I 17:46:49.014 [DFU] Services discovered
 D 17:46:49.039 [DFU] wait(1000)
 W 17:46:50.052 [DFU] Application with buttonless update found
 V 17:46:50.052 [DFU] Jumping to the DFU Bootloader...
 V 17:46:50.052 [DFU] Enabling notifications for 8e400001-f315-4f60-9fb8-838830daea50

RE: regarding to buttonless DFU

Hung Bui — Thu, 31 Aug 2017 10:13:38 GMT

Please click the link i pointed to on the comment above, about step 6 in testing section.

RE: regarding to buttonless DFU

djqtsg — Thu, 31 Aug 2017 09:14:47 GMT

sorry, which document, your blog?

In your blog, it is mentioned how buttonless DFU is implemented (bootloader_start() in ble_dfu.c file). However, I even cannot find that function in ble_dfu.c file.

RE: regarding to buttonless DFU

Hung Bui — Thu, 31 Aug 2017 08:48:31 GMT

Please read the documentation ! It's right there on the left handside when you click the link.

RE: regarding to buttonless DFU

djqtsg — Thu, 31 Aug 2017 07:39:11 GMT

OK. I see.

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

RE: regarding to buttonless DFU

Hung Bui — Thu, 31 Aug 2017 07:28:42 GMT

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

RE: regarding to buttonless DFU

djqtsg — Thu, 31 Aug 2017 06:10:44 GMT

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"?

RE: regarding to buttonless DFU

Hung Bui — Wed, 30 Aug 2017 17:26:54 GMT

Your understanding is correct.

RE: regarding to buttonless DFU

djqtsg — Tue, 29 Aug 2017 09:51:57 GMT

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