Use external JLINK to download the program to the 52840DK board

RE: Use external JLINK to download the program to the 52840DK board

TANGyouyou — Thu, 15 Sep 2022 03:17:27 GMT

I'm sorry to bother you, but now I have the same problem as you. My NRF52840 uses 1.8V voltage, which means that the voltage of my SWDIO SWDCLK is 1.8V. And my Jlink is 3.3V, could you please tell me how to solve this problem so that JLink can work normally and download the program to NRF52840 successfully through Jlink?Looking forward to your reply. Thank you

RE: Use external JLINK to download the program to the 52840DK board

ArchieL — Sat, 07 Nov 2020 07:39:04 GMT

I have solved this problem. It is the power supply design that causes the voltage mismatch.
Thank you

RE: Use external JLINK to download the program to the 52840DK board

Amanda Hsieh — Fri, 06 Nov 2020 14:35:57 GMT

Hi Archie,

Is it possible to share the schematic of your board?

-Amanda H.

RE: Use external JLINK to download the program to the 52840DK board

ArchieL — Fri, 06 Nov 2020 08:30:02 GMT

Hi Amanda,There is another problem. My board SWDIO and SWDCLK output 1.8V, which seems to cause my board and JLINK to fail to match.
1. I designed according to the reference design. What could cause my board SWDIO and SWDCLK to output 1.8V,
2. JLINK voltage does not match, how to solve it

RE: Use external JLINK to download the program to the 52840DK board

Amanda Hsieh — Wed, 04 Nov 2020 11:38:49 GMT

Hi,

Please see the Debug input and trace documentation.

-Amanda H.