RE: dfu service echo

Mohamed O.Abouzeid — Wed, 26 Aug 2015 16:03:08 GMT

thanks stefan, it works

RE: dfu service echo

Stefan Birnir Sverrisson — Wed, 26 Aug 2015 14:07:35 GMT

Hi mohamed

Have you followed this guide on how to enable DFU mode from Master Control Panel when using the ble_app_hrs_with_dfu example? There is also a seperate guide here that describes how to include the DFU service in any custom application.

Generally, the application itself is not aware if there is bootloader on the device or not. The application is flashed at the top of the softdevice, regardless if a bootloader is present or not. All that the DFU service does is to write into GPREGRET register on the nRF51 which is retained when doing a soft-reset. When the DFU service has written to this register, it soft-resets the nRF51. At startup, the bootloader starts by reading the contents of the GPREGRET register to figure out if it should stay in DFU mode or start the application.

More information is in the further reading section of this DFU tutorial.

This video is very good for visualizing how the DFU works.

RE: dfu service echo

Mohamed O.Abouzeid — Wed, 26 Aug 2015 09:04:08 GMT

any help please