custom board bootlaoder not entering DFU mode even when there is no application installed

RE: custom board bootlaoder not entering DFU mode even when there is no application installed

khan_khan — Fri, 07 Jul 2017 10:56:28 GMT

thanks alot now my board is advertising .

RE: custom board bootlaoder not entering DFU mode even when there is no application installed

bjorn-spockeli — Fri, 07 Jul 2017 07:02:21 GMT

@khan_khan: See this answer.

RE: custom board bootlaoder not entering DFU mode even when there is no application installed

khan_khan — Fri, 07 Jul 2017 06:22:37 GMT

how to change the used clock ? i am confronting the same problem . my nRF52832 board is not advertising for DFU

RE: custom board bootlaoder not entering DFU mode even when there is no application installed

Hussein A Hazime — Fri, 16 Jun 2017 09:32:35 GMT

The problem was with the clock configuration of the Bluetooth softdevice init method static void ble_stack_init(bool init_softdevice)in the SOFTDEVICE_HANDLER_APPSH_INIT(&clock_lf_cfg, true); i had to change the used clock to match my requirements.

RE: custom board bootlaoder not entering DFU mode even when there is no application installed

bjorn-spockeli — Fri, 16 Jun 2017 08:32:12 GMT

Are you able to debug the bootloader, i.e. check whether you enter the bootloaders main function or not?

RE: custom board bootlaoder not entering DFU mode even when there is no application installed

AmbystomaLabs — Thu, 15 Jun 2017 18:57:42 GMT

Sorry, don't have an answer for you then. Based on what I have read and done, as long as the flag in the bootloader isn't set (which is the case when you haven't loaded an app through it) it should go straight to DFU mode. You could try doing an erase all on the custom board before programming it. It is possible the flag got set during some of your work and it isn't getting written over so it thinks valid code is out there.

Here is some info on the DFU flag: devzone.nordicsemi.com/.../

RE: custom board bootlaoder not entering DFU mode even when there is no application installed

Hussein A Hazime — Thu, 15 Jun 2017 14:25:32 GMT

The custom board is functional, I uploaded the normal application and it worked perfectly, even the Bluetooth.

RE: custom board bootlaoder not entering DFU mode even when there is no application installed

AmbystomaLabs — Thu, 15 Jun 2017 13:49:20 GMT

Sounds like clock differences. It's the most common reason for the softdevice to not start. It's also possible that either your external RTC crystal or external 32MHz crystal have issues. You should inspect the placement and soldering of both and their load capacitors.