Programming an external board through SWD

[Jens Strümper]

Hi there, I'm trying to program an external nrf51 board (Xuntong 5518) through the nrf51-DK Debug out connector. So far I have no success and I'm wondering if I have the correct PIN's connected. I power the Xuntong with VDD and GND from connector P1 and connect SWDIO (PIN 4 connector P20) and SWDCLK (PIN 5 connector P20). I tried the P19 header with a olimex JTAG adapter as well . When I drag my hex file to the flash drive the internal nrf51 is flashed only. I don't exactly know how I would recognize the external board using JLINK as there seems to be no serial number or so. However when I use nrfGo Studio I see application and softdevice which I would not expect to see when I'm connected to the correct nrf.

Any help would be greatly appreciated!

Regards, Jens

[Alex]

When you apply Vcc on pin 1 (P19) from your board then nRF51DK will recognize external board and will use Debug out signals, not internal nRF51 chip

[Jens Strümper]

Thanks Alex! This was wrong in my setup. I thought PIN1 should supply power to the external board not the other way around! Is there an easy way to identify if the external board is recognized? I fiddled around with JLINK hwinfo and status commands but they don't give information like a serial number.

Cheers, Jens

[Alex]

I'm not expert in JLink commands but you may try to read memory map where chip ID saved.

NRF_FICR_BASE                   0x10000000UL
DEVICEID[0] offset=0x060 Device identifier
DEVICEID[1] offset=0x064 Device identifier

[Susheel Nuguru]

Jens, Please update this thread or close it.