Memory configuration in nRF52820 for DFU Support

[Bosemani_Raja]

Hello

I'm using nrf52820 chip with Segger embedded studio and nRF5_SDK_17.1.0_ddde560 also soft device "s112_nrf52_7.2.0_softdevice" .

I want to add DFU through BLE support to my application, i confused in the memory allocation part,

how to allocate a RAM and ROM for application and bootloader (secured bootloader) ?

In Section placement macros what value need to write. I'm using S112 soft device .

can you provide memory allocation example for nrf52820 DFU support application and bootloader.

In nrf52820 can we do dual bank update?

Best regards

Bosemani

[tesc]

Hi,

For a DFU application example, please have a look at the Buttonless DFU Template Application.

In nrf52820 can we do dual bank update?

The nRF52820 has 256 kB flash, and the SoftDevice s112 v7.2.0 uses 100 kB (see the release notes at <sdk folder>\components\softdevice\s112\doc). In order for dual bank upgrade to be possible, there must be enough flash left for the upgrade after subtracting SoftDevice, Application, Application data, DFU bootloader, bootloader settings and MBR param page. See Dual-bank updates.

Regards,
Terje

[Bosemani_Raja]

Hai Terje,

Thank you for your response..!

I tried Buttonless DFU Application without changing anything , It worked.

i just need some clarification to integrate to my application.

1. What is the size of DFU bootloader, bootloader settings, MBR param page, Application data , SoftDevice (already you mentioned 100kB)?

2. How I can define this size in my program?  (starting address and ending address)

3. How can I verify everything is in Correct memory place? (Without any overlapping)

Best Regards

Bosemani

[mrono]

Bosemani_Raja said:

In nrf52820 can we do dual bank update?

I was checking the same thing some months ago: smallest-nrf52-device-that-can-be-fully-updated-through-ble

My conclusion was that there is not enough flash space in the nRF52820 to update the bootloader and softdevice over BLE. Or to be more precise, there is just enough space if you don't need any nonvolatile storage (ie FDS). And if any future softdevice version is even one page larger then it won't be possible to update it over BLE.

[Bosemani_Raja]

Hai Mrono,

Thank you for your support...!

I'm not planning for Softdevice update.

Yes I need FDS (NVS)  and application + bootloader update.

After flashing bootloader, bootloader settings, MBR param page, Application data and SoftDevice how much memory is left for our application and DFU bank?

Did you tried any DFU update?

[mrono]

Bosemani_Raja said:

After flashing bootloader, bootloader settings, MBR param page, Application data and SoftDevice how much memory is left for our application and DFU bank?

From the case I linked to: "That leaves 0x1F000 of free space." So if I got the numbers right, that much is left for the application. And a possible second bank.

Bosemani_Raja said:

Did you tried any DFU update?

No, I went for a device with more flash, the nRF52833.