Program external BMD-300 with NRF52DK

[Maxim]

Hello, I am trying to program an BMD-300 using the NRF52-DK on a custom board,

The BMD300 is powered by the NRF52DK

BMD300 -> NRF52DK

SWDIO -> SH_SWDIO (pin 4) on P20

SWDCLK -> SH_SWDCLK (pin 5) on P20

VDD -> VTG (pin 3) / VCC (pin 2) on P20 (The BMD300 is powered by the NRF52DK)

GND -> GND_DETECT (pin 8) on P20 and GND on NRF52DK

The first time I connected the BMD300 to the board the command nrfjprog --family nrf52 -- recover was working and the BMD 300 was detected.

Then I use NRFGO to program the softdevice (S132) and keil to load the application, evething works fine.

But when i try to program again the BMD300 i could load any program, and command nrfjprog --family nrf52 -- recover doesn't work. NRFGO can't detect the board again.

Then i use P19 without success.

The program loaded by keil was ble_app_uart (pca 10040) from the sdk without any modification, i think the program made the BMD unaccesible but i don't know how to repair it.

Can someone please help me. Thanks, Maxim

[Maxim]

I've found the solution, before flashing the BMD-300 don't take care about the reset button and after the programming the reset button avoid the flashing. So my problem was the reset button on my custom board, the reset button was solder on the wrong side and stay push all the time. Thanks for your help !

[Jørgen Holmefjord]

Great that you got it working, and thanks for reporting back the solution!