How to flash nRF52 through an external host MCU?

RE: How to flash nRF52 through an external host MCU?

Andy — Fri, 22 Mar 2019 08:25:56 GMT

Ah, somehow I missed the “even the first time” part. I’d suggest you make the NRF52 the host, the STM32 has a built-in bootloader and you can flash it from the NRF52 the first time using UART or I2C. I did this to allow for STM32 firmware updates over BLE through the NRF52 and it works quite well.

RE: How to flash nRF52 through an external host MCU?

Einar Thorsrud — Fri, 22 Mar 2019 08:03:49 GMT

Hi Youssef,

[quote user=""]The nRF52 needs to be programmed through the host (even the first time) so the programming needs to go through the SWD interface. (Cannot use the UART as the bootloader is not programmed).[/quote]

The only options we have is based on a serial bootloader. If that really is impossible like you write (why can you not pre-program the nRF?), then the host MCU must have a SWD implementation. Nordic does not provide any such implementation, though.

[quote user=""]Is there example software to allow the programming of the nRF52 from an external host? [/quote]

That would be the bootloader (which needs to be programmed first).

RE: How to flash nRF52 through an external host MCU?

Andy — Fri, 22 Mar 2019 07:35:05 GMT

Is there any reason why you don't want to flash the bootloader in the NRF52?