Programming nrf52 DK board using external j-link

RE: Programming nrf52 DK board using external j-link

IndraP — Fri, 23 Jul 2021 17:04:31 GMT

I was able to program the development kit with the external j-Link. Seems the issue was with the cable.

Thanks.

RE: Programming nrf52 DK board using external j-link

IndraP — Thu, 22 Jul 2021 13:47:12 GMT

yes, it is giving me 2.7 V

RE: Programming nrf52 DK board using external j-link

Jared — Thu, 22 Jul 2021 13:42:16 GMT

Ok so you're able to flash the board with the J2 USB interface via the onboard debugger. What voltage do you measure when you connect the board via P18 and the board is supplied externally via the coin cell? 2.7 V??

RE: Programming nrf52 DK board using external j-link

IndraP — Thu, 22 Jul 2021 13:37:40 GMT

I have removed the coin battery and powering it through J2 USB. Pin 1 measures 2.7V. When I try to go into debug mode using Segger studio it prompts the available Jlink's - external Jlink and nRF52 DK on board debugger. With on board debugger I am able to program the board but with external debugger it gives me error.

RE: Programming nrf52 DK board using external j-link

Jared — Thu, 22 Jul 2021 13:22:54 GMT

Hi,

What voltage do you measure on PIN 1? Are you able to flash the board if you use the J2 USB interface?

regards

Jared

RE: Programming nrf52 DK board using external j-link

IndraP — Thu, 22 Jul 2021 05:24:50 GMT

I am using 20 pin JTag. As suggested I made following connections

j-Link base nRF52 DK Debug IN P18 Connector

Pin 7(SWDIO) -------> Pin 2 (SWDIO)

Pin 9(SWCLK) --------> Pin 4 (SWCLK)

Pin 13(SWO) ----------> Pin 6 (SWO)

Pin 15(RESET) ---------> Pin 10 (RESET)

Pin 1(VTREF) ----------> Pin 1 (VDD)

Pin 4 (GND) -----------> Pin 5(GND)

Still, I am getting same error "Failed to connect to target. No idcode detected. Please check connection and target Interface Type"

RE: Programming nrf52 DK board using external j-link

Jared — Wed, 21 Jul 2021 13:50:22 GMT

Hi,

You need to also provide VTG to the debugger, the supply voltage of the DUT. On the 10 pin standard Jtag header, that is Pin 1.

regards

Jared