About dfu firmware update in serial communication using nRF52 UART

RE: About dfu firmware update in serial communication using nRF52 UART

kmyumeka — Wed, 19 Jul 2023 07:57:21 GMT

Hi Priyanka,

Thank you for your information. We are currently looking at it.

Thanks,

Sunny

RE: About dfu firmware update in serial communication using nRF52 UART

Priyanka — Mon, 17 Jul 2023 12:59:40 GMT

Hi Sunny,

Sigurd is on vacation and I am looking into this for the time being. I have asked internally to experts regarding this and it seems it should be possible. Then it's similar to what's there in the buttonless example. You just need to write to the retain register GPREGRET and then trigger a reset.

The way it works is pretty simple: To switch, you can write to the retention register GPREGRET a flag (BOOTLOADER_DFU_START = 0xB1) and then do a soft reset. This is done in bootloader_start() in ble_dfu.c file.

Please refer this guide: https://devzone.nordicsemi.com/guides/short-range-guides/b/software-development-kit/posts/getting-started-with-nordics-secure-dfu-bootloader#h75sjziavjbukzaywg6xlx19np0fm4

-Priyanka

RE: About dfu firmware update in serial communication using nRF52 UART

kmyumeka — Wed, 12 Jul 2023 07:20:23 GMT

Hi,

Any info or pointer to show how to do this would be greatly appreciated. We still find no way to move forward with this update firmware procedure.

Thanks

Sunny

RE: About dfu firmware update in serial communication using nRF52 UART

kmyumeka — Mon, 10 Jul 2023 07:53:18 GMT

Hi Sigurd,

Reqarding enter DFU mode, STM32 and nRF52 are only connected to the UART port and cannot use the button startup method. I'm thinking of sending a special command from STM32 to trigger nRF52 to reset itself and start DFU mode for my bootloader to run. I would like to know how this can be achieve that with nRF52 application. If possible, a sample code would be very helpful.

Thanks,

Sunny

RE: About dfu firmware update in serial communication using nRF52 UART

kmyumeka — Fri, 07 Jul 2023 17:32:22 GMT

Hi Sigurd,

Thank you for the info. I will take a look at the links and follow up with you later.

Very much appreciated.

Sunny

RE: About dfu firmware update in serial communication using nRF52 UART

Sigurd — Fri, 07 Jul 2023 11:38:30 GMT

Hi,

1) See the testing steps here: https://infocenter.nordicsemi.com/topic/sdk_nrf5_v17.1.0/sdk_app_serial_dfu_bootloader.html

To enter DFU mode, hold button 4 down during startup.

2) We don't have any official code for this. But we have some unofficial examples in this blog, chapter 6 DFU Master code

Getting started with Nordic's Secure DFU bootloader, a step by step guide