Problem flashing custom nrf52 board using openocd, and unable to connect using JLink

RE: Problem flashing custom nrf52 board using openocd, and unable to connect using JLink

David — Thu, 04 Oct 2018 13:48:53 GMT

Oh, Kenneth, it seems pulling pin 21 did the trick. I can now flash the chip. Thanks a lot, I am very grateful. Please, can you explain to me what is the function of pin 21?

RE: Problem flashing custom nrf52 board using openocd, and unable to connect using JLink

Kenneth — Thu, 04 Oct 2018 07:53:05 GMT

Schematic looks good as far as I can see.

I strongly suggest to get a nRF52-DK for comparison, you can also use the nRF52-DK to program your own board in this case. Then you can compare for instance voltages with your own board for comparison, and verify the tools works as expected.

I notice pin 21 should be pulled high in case pin reset have been enabled (I was thinking of nRF52840 that use pin 18). You do not need to connect SWO and RESET on debugger J3 header.

Kenneth

RE: Problem flashing custom nrf52 board using openocd, and unable to connect using JLink

David — Wed, 03 Oct 2018 16:38:50 GMT

Hello Kenneth, I tried pulling pin 18 high, but its the same result. Here is some part of the schematic.

RE: Problem flashing custom nrf52 board using openocd, and unable to connect using JLink

Kenneth — Wed, 03 Oct 2018 15:20:03 GMT

Can you pull pin 18 high?

Can you share schematic?

Kenneth

RE: Problem flashing custom nrf52 board using openocd, and unable to connect using JLink

David — Wed, 03 Oct 2018 12:23:43 GMT

I am using the j-link edu version. I do not have the nRF52-DK .

RE: Problem flashing custom nrf52 board using openocd, and unable to connect using JLink

Kenneth — Wed, 03 Oct 2018 12:15:01 GMT

What j-link are you using? Do you have a nRF52-DK?

RE: Problem flashing custom nrf52 board using openocd, and unable to connect using JLink

David — Wed, 03 Oct 2018 11:56:19 GMT

Thank you kenneth, I have a few samples of the board, so I am using a new board. I tried originally with stlink and I am able to connect, But unable to flash probably because of the write protect. I have done some reading and this write protect can only be removed using the nrfjprog tool. That is why I switched to jlink. I am now using the correct voltage range and I have connected swdio, swdclk, vtref and gnd. But its still the same error.

RE: Problem flashing custom nrf52 board using openocd, and unable to connect using JLink

Kenneth — Wed, 03 Oct 2018 11:51:44 GMT

I am not familiar with st-link v2, but I notice it says JTAG in the log, make sure it is SWD.

If j-link doesn't work, then make sure you have connected GND(and possible GND_DETECT), VDD (VTarget), SWDIO and SWDCLK. Also make sure you have the latest and greatest nRF command line tools installed.

I hope you have not at any time fed >3.6V to VDD or any other GPIO's, as that may have damaged the IC.

You may pull pin 18 high just in case pin reset have been enabled.

Best regards,
Kenneth

RE: Problem flashing custom nrf52 board using openocd, and unable to connect using JLink

David — Tue, 02 Oct 2018 02:47:53 GMT

Hello,, I have tried using 3.3v but still cannot connect to the board. Same errors as listed above.

RE: Problem flashing custom nrf52 board using openocd, and unable to connect using JLink

David — Mon, 01 Oct 2018 13:55:46 GMT

Okay, I am trying this now. let me check.

RE: Problem flashing custom nrf52 board using openocd, and unable to connect using JLink

awneil — Mon, 01 Oct 2018 13:54:39 GMT

[quote userid="74286" url="~/f/nordic-q-a/39072/problem-flashing-custom-nrf52-board-using-openocd-and-unable-to-connect-using-jlink/150995"]Do you think this might be a source of problem?[/quote]

Yes.

From the J-Link Manual:

"VTref is the target reference voltage. It is used by the J-Link to ... create the logic-level reference for the input comparators and to control the output logic levels to the target."

RE: Problem flashing custom nrf52 board using openocd, and unable to connect using JLink

David — Mon, 01 Oct 2018 13:43:57 GMT

Yes, I mean nRF52832, sorry for the spelling. The chip voltage is 3.3 v. the 4.8 is what I am using as Vtref on my jlink.

Do you think this might be a source of problem?

RE: Problem flashing custom nrf52 board using openocd, and unable to connect using JLink

awneil — Mon, 01 Oct 2018 13:40:39 GMT

[quote userid="74286" url="~/f/nordic-q-a/39072/problem-flashing-custom-nrf52-board-using-openocd-and-unable-to-connect-using-jlink"]NRF5282 [/quote]

You mean nRF52832 ?

https://www.nordicsemi.com/eng/Products/Bluetooth-low-energy/nRF52832

[quote userid="74286" url="~/f/nordic-q-a/39072/problem-flashing-custom-nrf52-board-using-openocd-and-unable-to-connect-using-jlink"]My device voltage is also 4.8v[/quote]

The Product Specification says the Absolute Maximum is 3.9V:

http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52832.ps.v1.1/abs_max_ratings.html?cp=2_1_0_4#abs_max_ratings

Recommended max for operation is 3.6V:

http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52832.ps.v1.1/recommended_op_conditions.html?cp=2_1_0_5#concept_vng_xls_2q