nRF52832 Function (DFU)

[CFF.K]

hi, 

I have some questions, please help me solve these questions. ( I use SDK 15.2.0 and nRF52832)

1. my customer ask how many central bonded with one nrf52? (my project use muti-peripheral)

2. I rush to develop DFU into our product, but I have two questions. First of all, how could I use program return to bootload from application code. (do you have a suggestion or example?)

3. Next, I use nrfgo to program application, bootload, softdevice code, but my code still in the bootload. how leave this situation?

4. All nRF52832 has mac address, Is these address unique?

[Sigurd]

Hi,

1) The maximum number of bonds is limited by the available flash space to store the bond data.  The amount of space reserved for storing bond data is limited by FDS_VIRTUAL_PAGES. See this page.

2) Yes, take a look at the buttonless DFU example. See this link. This post could also be helpful.

3) nrfgo studio is deprecated, I recommend nRF Connect and the programmer app. See this link. 

CFF.K said:

but my code still in the bootload. how leave this situation?

It could be that you forgot the settings page. You can create it like this:

nrfutil settings generate --family NRF52 --application my_app.hex --application-version 0 --bootloader-version 0 --bl-settings-version 1 settings.hex 

4) Yes, you can consider it unique. See this post.

[CFF.K]

 Thanks for your reply.

I solve finish these question except 1.

I know the maximum number of bonds depends on FDS. but I still don't how to calculate the maximum number of bonds for my customer?

[Sigurd]

A bond has a variable length (~100 bytes, with 1 CCCD it can be ~ 152 bytes) based on what type of connection, central settings, etc.

If FDS is configured to use 3 pages of flash (2 x 4K for data storage, and 1 x 4K for swap), then you have a total of 8 kBytes (8192 bytes) of storage. This can however be configured in your sdk_config.h to match your needs.