Flashing to nRF5340 IO Shield.

RE: Flashing to nRF5340 IO Shield.

PjGlasso — Sat, 17 Aug 2024 16:13:52 GMT

Hi there,

Yea, You are connecting it wrong. The 3.3v from your custom board signals the Jlink that an EXTERNAL flash is now connected. more or less.

I found this working with the nRF52840_DK and the P20 port. Once I connected it properly the Device revision shows up in the DK device window and it's the flash revision present on the custom board.(not the DK ) further if I remove power from the custom board the original Flash of the DK won't show back up unless I power cycle the DK. Always power up the DK last is what I have found to work the best, see the link I posted with the pictures.

HTH

GL :-) PJ

RE: Flashing to nRF5340 IO Shield.

akhil — Sat, 17 Aug 2024 14:21:13 GMT

[quote userid="134083" url="~/f/nordic-q-a/113998/flashing-to-nrf5340-io-shield/498717"]VTref[/quote]

VDD of I/O Shield

RE: Flashing to nRF5340 IO Shield.

SohamGhugare — Sat, 17 Aug 2024 13:48:06 GMT

Yeah we tried giving an external power source to VTref, that didn't work either. One thing which I noticed from the start that I forgot to mention is, no matter what program I flash, it always sets all the pins on IO Shield to high (atleast the pins we have connected). So even if I flash a normal blank program, the LED connected to P0.31 of IO Shield is always set to high.

PS: we are using MDBT53-P1M IO Shield.

RE: Flashing to nRF5340 IO Shield.

Turbo J — Fri, 16 Aug 2024 16:00:28 GMT

Most likely you are missing the required external power source.

Vtref is a sink and not a source for voltage.