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UART DFU MBR example

Hi,

I'm trying to use uart dfu mbr example and when I flush boot loader via jlink I see that it write mbr hex file at address 0x0. My main application also started from address 0, should I move it to address MBR_SIZE or this mbr hex file used only for debugging.

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Dinkin Uri over 5 years ago +1

Thank you. I will try
Dinkin Uri over 4 years ago in reply to Dinkin Uri +1

No I have not log from boot loader. I implemented protocol of boot loader in main processor that connected via uart with processor with boot loader. I send init packet and it is working fine, but when…

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0 Hung Bui over 5 years ago

Hi Uri,

The MBR is needed for the bootloader to operate. If your application started from address 0, you would need to move it to MBR_SIZE (0x1000). You can refer to our blinky example made for MBR compatibility \examples\peripheral\blinky\pca10040\mbr.
0 Dinkin Uri over 4 years ago in reply to Hung Bui

Hi, I encountered in problem when I send fw image to boot loader, it is crushes after second write request, init packet sent ok, but when i start transfer fw image it boot loader is crushed. Do you know what can be a reason?
0 Dinkin Uri over 4 years ago in reply to Hung Bui

Yes, I try send from nrf52840 that is my master send to nrf52805 via uart. I used your sample to send package and I have the same behavior, your program is stuck after it starts to send image because your code is blocking on uart transfer bit, but init packet is sent ok.
0 Hung Bui over 4 years ago in reply to Dinkin Uri

Hi Uri,
Have you tried to use nRFutil application on PC to send the same image ?
Have you done any successful DFU update to your NRF52805 chip ?

If you can do a DFU update using the nRFUtil you can capture a logic trace of the UART pins. And then do the same with your/my DFU bootloader and compare the two.

Which error code was thrown after you sent the init packet ?
0 Dinkin Uri over 4 years ago in reply to Dinkin Uri

Hi, the problem is that 805 is not exposed to PC, the only way is via 840. Can I send you project and may be you discover the problem?
0 Hung Bui over 4 years ago in reply to Dinkin Uri

Please try to setup a test bench, you can use a NRF52 DK to test receiving image.

What you are trying to build is quite complex and requires good understanding of the bootloader and the DFU protocol. I don't see any way of achieving that without good debug setup. I would suggest to get very familiar with the UART DFU process, by first testing it with the nrfutil on PC.
0 Dinkin Uri over 4 years ago in reply to Hung Bui

Ok, thank you. Where can I find uart dfu project for 805?

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0 Dinkin Uri over 4 years ago in reply to Hung Bui

Ok, thank you. Where can I find uart dfu project for 805?

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0 Hung Bui over 4 years ago in reply to Dinkin Uri

Hi Uri,
The nRF52805 is very similar to the NRF52810, with some differences in the peripherals, but not in the flash and RAM.
You can re-use the PCA10040E project (which is for NRF52810) for the nRF52805. You may need to switch the boards.h setting to choose nrf52805 instead of nRF52810.
0 Dinkin Uri over 4 years ago in reply to Hung Bui

That what I did already. Thank you tried to help.