Buttonless BLE DFU with non-ble apps.

[SL06]

Hi, I am developing an IMU app communication with ESB.  I would like to send to the board a command with ESB to put the nrf52832 board in BLE DFU mode.  

I have look at the different methods for entering in DFU mode :

NRF_BL_DFU_ENTER_METHOD_BUTTON

NRF_BL_DFU_ENTER_METHOD_PINRESET

NRF_BL_DFU_ENTER_METHOD_GPREGRET

NRF_BL_DFU_ENTER_METHOD_BUTTONLESS

I understand the BLE buttonless DFU exemple with the method NRF_BL_DFU_ENTER_METHOD_GPREGRET but I but seems to depend on a lot of BLE and SDH related files.

Might be wrong but the  NRF_BL_DFU_ENTER_METHOD_BUTTONLESS seems the simplest but I could not finding any exemples of code to add in my program.

I have read all the DFU / SDK document and post related to this topic, without finding the answer.

Could you please point me in the wright direction.

Thanks 

[Vidar Berg]

Hi,

You don't have to port everything from the BLE buttonless example to make this work. All that it's required is really to update the GREPREGRET register with the 'BOOTLOADER_DFU_START' value, then do a reboot by calling NVIC_SystemReset()

Something like this:

//Call this when receiving dfu stat command from ESB,etc.

enter_dfu_mode()

{

NRF_POWER->GREPREGRET =  BOOTLOADER_DFU_START

NVIC_SystemReset();

}

[SL06]

I will work on this tomorrow. 

Is this the simplest method ?  what about the NRF_BL_DFU_ENTER_METHOD_BUTTONLESS option ?

I could not found any info on that one.

[Vidar Berg]

NRF_BL_DFU_ENTER_METHOD_GPREGRET is  the simplest method for buttonless DFU. 'NRF_BL_DFU_ENTER_METHOD_BUTTONLESS' is supported, but not used by any of our examples anymore because it requires you to write to the bootloader settings page in flash.

[SL06]

Thanks,

I could not get the line working, NRF_POWER->GPREGRET = BOOTLOADER_DFU_START;

there probably a header missing, but the following 2 line  works just fine after adding nrf_power.h to my program.  Thanks

nrf_power_gpregret_set(0xB1);

NVIC_SystemReset();