Problem programming xuntong external board (no device detected)

[Fabri_Cortone]

Hi,

I have a problem to program an external board with my PCA10028 board. My external board is a Xuntong chip.

(Heart-Rate-Monitor-2-4GHz-SOC-BLE-Module-based-on-nRF51822-QFAA-R-Freeshipping.jpg_200x200.jpg).

All connections are well done but the device in Nrfgo Studio is not detected. I tried to recover the chip with nrfjprog.exe --recover and with J-Link Commander but nothing.

Someone can help me?

Thanks.

[Chris]

One thing with the Xuntong boards is they only have one oscillator on there. You need to change the reference code to support the derived oscillator..

It's been a while since I used them but I had the same problem. Something to do with the LFCLK (from rough rough memory) but that'll likely be your problem.