Question related to Serial DFU

RE: Question related to Serial DFU

pd@learner — Thu, 11 Mar 2021 08:44:59 GMT

Thanks

one thing I forgot to tell you that in my application I have used UICR address 0x10001080 to store the unique id of the device. When I Commented UICR part of the code and repeat the procedure as above mentioned in the thread then I got 2 different sections of bootloader and application.

=> I want to use UICR in our application. Can you suggest an approach to solve this problem with UICR?

=>I didn't use softdevice. so can you tell me whether the following function is correct or not?

void set_dfu_mode()
{
nrf_drv_spi_uninit(&spi);
NRF_POWER->GPREGRET = 0xFF;
NRF_POWER->GPREGRET = 0xB1

NVIC_SystemReset();

}

RE: Question related to Serial DFU

Vidar Berg — Thu, 11 Mar 2021 08:35:10 GMT

Please use the Programmer app as I suggested earlier. Also, please confirm what version of mergehex you are using.

RE: Question related to Serial DFU

pd@learner — Thu, 11 Mar 2021 08:13:10 GMT

You need to program the MBR (located in \components\softdevice\mbr\nrf52832\hex) and also make sure that your application starts at address 0x1000 in flash, and 0x20000008 in RAM (same as the blinky mbr sample).

=> I have changed start address as per the blinky mbr sample. I have used the following command and generate a combined hex. The generated flashed using the program bootloader option of nrfGo.

mergehex --merge C:\Data\nrf52832\nRF5_SDK_15.2.0_9412b96\nRF5_SDK_15.2.0_9412b96\components\softdevice\mbr\nrf52832\hex\mbr_nrf52_2.2.2_mbr.hex C:\pc-nrfutil-master\serial_bootloader.hex --output serial_mbr_bootloader.hex

=> Then application hex is burned but I got the same result.

RE: Question related to Serial DFU

Vidar Berg — Wed, 10 Mar 2021 14:07:48 GMT

[quote userid="75720" url="~/f/nordic-q-a/72600/question-related-to-serial-dfu/299030#299030"]Also in the blinky example, there are two subfolders blank and MBR. What is the difference between this?[/quote]

The mbr project is configured so that it does not overlap with the MBR.

RE: Question related to Serial DFU

pd@learner — Wed, 10 Mar 2021 14:01:44 GMT

Could you try to program the merged hex with this program instead?

=> I have tried using mergehex but the results are the same.

=> I want to perform serial OTA without this softdevice. What is the correct procedure to perform serial OTA?

=> In the dfu example secure_dfu_test_images folder, I have found that blinky_mbr.hex.

Also in the blinky example, there are two subfolders blank and MBR. What is the difference between this?

Because whenever I am trying to generate bootloader setting hex using blank hex file then nrfutil gives the error.

RE: Question related to Serial DFU

Vidar Berg — Wed, 10 Mar 2021 13:45:10 GMT

Hi,

The code you use to enter DFU mode looks to be correct, but I see you are using nRF GO studio for programming. This program has been deprecated and replaced by the Programmer app in nRF connect for desktop. Could you try to program the merged hex with this program instead? Also, we have a bug in the current mergehex program (v.10.12.x) that may corrupt the application image, so please make sure you are not using this version to merge the hex files (to check the version number, run mergehex --version)

Best regards,

Vidar