DFU with nRF52805

RE: DFU with nRF52805

AGarcia — Thu, 22 Jul 2021 16:30:41 GMT

Thank you, I already tested button DFU and buttonless DFU and it worked correctly.

RE: DFU with nRF52805

Hung Bui — Thu, 22 Jul 2021 09:24:22 GMT

Hi AGarcia,

Configuring NRF_BL_DFU_ENTER_METHOD_BUTTON and NRF_BL_DFU_ENTER_METHOD_BUTTON_PIN would allow you to enter DFU bootloader mode by holding the button when resetting (or powering on) the device.

If you want to immediately enter DFU bootloader from a button when you are in an application you may want to look into how it's implemented in the ble_app_buttonless_dfu example. You can have a look here.

RE: DFU with nRF52805

AGarcia — Wed, 21 Jul 2021 15:30:34 GMT

I think NRF_BL_DFU_ENTER_METHOD_BUTTON have to be set to 1 and change NRF_BL_DFU_ENTER_METHOD_BUTTON_PIN to set the number of the pin where my button is in custom board right?

RE: DFU with nRF52805

AGarcia — Wed, 21 Jul 2021 15:21:59 GMT

Hi!

I try what you suggest to do and it works, so this is what I did:

I'm going to make a BT application so I'm using the ble_app_template in this directory:
```
examples\ble_peripheral\ble_app_template\pca10040e\s112\ses\ble_app_template_pca10040e_s112.emProject
```
At the moment I don't have the application fully implemented, just configure a GPIO to blink a LED and test if it works.

My memory segments in the ble_app_template are this:

FLASH_PH_START=0x0
FLASH_PH_SIZE=0x30000
RAM_PH_START=0x20000000
RAM_PH_SIZE=0x6000
FLASH_START=0x19000
FLASH_SIZE=0x17000
RAM_START=0x20001a40
RAM_SIZE=0x45c0

Make the zip package with the app to make the DFU.
Change NRF_BL_DFU_ENTER_METHOD_BUTTON = 0 in bootloader and compile.
Load to the target the softdevice and the bootloader
Use the mobile app to make the DFU

When the DFU were finished the app run correctly, the led blinks. Now I know that my app works with the bootloader and softdevice, what have I to do if I want to enter DFU mode with a button in my app?

RE: DFU with nRF52805

Hung Bui — Tue, 20 Jul 2021 12:56:33 GMT

Hi AGarcia,

Could you let me know which blinky example did you test ?
Since you are compiling it to work with a softdevice, have you modified the start address of the blinky example to the correct location (right after the softdevice).

I would suggest to test doing normal DFU (1. Flash softdevice + bootloader; 2. Generate .zip file from app.hex; 3. DFU update the .zip file) just to be sure that the app would work fine with the bootloader + softdevice.

After that you can test with the bootloader setting. The main job of the bootloader setting is to tell the bootloader that there is a valid application on the chip and the bootloader should run the app.

To debug this I think the easiest is to use the debug bootloader (don't forget to do a chip erase when you switch to debug bootloader). With that you can step into the code and check why the bootloader doesn't want to jump to the app but stay in bootloader mode instead.

I noticed that you are using a custom board, please make sure NRF_BL_DFU_ENTER_METHOD_BUTTON_PIN is not active when the bootloader booting up, otherwise it will enter DFU mode automatically. You can disable this feature by setting NRF_BL_DFU_ENTER_METHOD_BUTTON = 0.