Dual Bootloader -- DFU (BLE) + UART?

[Tim Clark]

Wondering if there are any example/reference implementations of a bootloader for the nRF51822 that support Device Firmware Update over both UART and BLE? We've got the BLE stuff working well, but would like to make sure that we've got UART for those that might not have a compatible BLE SmartPhone.

Thanks!

[Hung Bui]

Hi Tim,

We provided both solutions, UART and BLE. However, they are separated project and are not made to work together initially.

You may have to modify the source code to allow end customer to choose which type of transportation they want to use, switching a button for example.

There would be some work needed to combine the 2 projects, but I don't think it would be very difficult.

[WestCoastDaz]

Hung,

I am interested in this as well! Can you point me to the 2 projects you are referring to, I can't seem to find them.

Cheers, Darren

[Hung Bui]

Hi Darren,

You can find the SDK at this folder \examples\dfu\bootloader\pca10028 (SDK v8.0). There are 3 projects:

• BLE DFU dual bank

• Serial DFU dual bank

• Serial DFU single bank

[Mike]

Hi Hung,

I am having trouble combining two different projects on Keil v5, with the software packs. I was thinking of modifying the source files for the libraries from the packs, dfu_transport_ble.c, dfu_transport_serial.c and bootloader.c, and then I will include both of the source files in the project. However as the way it is set up in the packs, I can only choose either to include serial or ble source file (it shows up as a variant). So just wondering what process you would follow to combine the two bootloaders?

Thanks! Mike

[Hung Bui]

Hi Mike, I would suggest to try the legacy support for KEIL v5.x

After that you can install the nRF51 SDK without pack, where you can use the library directly as a file in the files tree and can modify it as you needed.

[Sourabh Barve]

Hi Hung, I modified the dfu_transport.h, dfu_transport_serial.c, dfu_transport_ble.c and bootloader.c to have two transport options for DFU. I use the GPRGRET register to communicate the transport mode to bootloader through app. The serial DFU works great but the BLE/OTA DFU fails. Whenever I start the DFU through nRFToolbox app, the device enters the bootloader successfully but the update fails at 0% showing "Error: REMOTE DFU OPERATION FAILED". I have not modified the above files beside just changing the names of the functions (dfu_transport_update_start and dfu_transport_close) and added a #define for new GPREGRET pattern. I use SDK11.0 and nrf52832. Can you help me out?