DFU via UART using a custom desktop application

RE: DFU via UART using a custom desktop application

Amanda Hsieh — Tue, 23 Nov 2021 07:55:18 GMT

Set the register to 0xB1.

-Amanda

RE: DFU via UART using a custom desktop application

jPolo777 — Mon, 22 Nov 2021 22:36:33 GMT

[quote userid="77782" url="~/f/nordic-q-a/81924/dfu-via-uart-using-a-custom-desktop-application/340037#340037"]You can enable NRF_BL_DFU_ENTER_METHOD_GPREGRET in the sdk_config.h, and write the special value in the retention register GPREGRET register a flag (BOOTLOADER_DFU_START = 0xB1) in the application and then do a soft reset (NVIC_SystemReset) to switch. [/quote]

So, If I understand well, when I want the nRF to go into DFU mode, I have to set the GPREGRET register in the nRF application (NRF_POWER->GPREGRET = 0x01) and then call the function NVIC_SystemReset?

RE: DFU via UART using a custom desktop application

Amanda Hsieh — Mon, 22 Nov 2021 11:58:06 GMT

Hi,

See DFU mode doc that Entering DFU mode is triggered by one of the optional sources:

Button (NRF_BL_DFU_ENTER_METHOD_BUTTON),
Pin reset (NRF_BL_DFU_ENTER_METHOD_PINRESET),
Special value in GPREGRET register (NRF_BL_DFU_ENTER_METHOD_GPREGRET),
Request from the application written to the settings page (NRF_BL_DFU_ENTER_METHOD_BUTTONLESS).

You can enable NRF_BL_DFU_ENTER_METHOD_GPREGRET in the sdk_config.h, and write the special value in the retention register GPREGRET register a flag (BOOTLOADER_DFU_START = 0xB1) in the application and then do a soft reset (NVIC_SystemReset) to switch.

Have a look at this post for SPI. Another project that does more or less the same is from one of our FAEs' github: nrf-slim-serial-uart-dfu-host-c-code.

In case you need it, you can also check the bootloader's serial transport documentation on infocenter.

Regards,
Amanda