Can't program board when audio cable plugged into board

RE: Can't program board when audio cable plugged into board

Håkon Alseth — Tue, 13 Apr 2021 13:38:30 GMT

Hi,

[quote user="cory123"]When I plug in an I2C device via a header and 4cm wire I get the same problem independent of the headphone issue. It seems like the cables I'm plugging in are somehow messing with the stability of VCC and GND. I will probe with my multi-meter and report back. Thanks![/quote]

Does your firmware handle this scenario? If the firmware asserts, the default behavior is to do a soft-reset, and if it also asserts (ie. resets) in the boot-up process; you can get into a scenario where it is hard to attach to the nRF. Try enabling blocking asserts via adding the preprocessor symbol "DEBUG".

Kind regards,

Håkon

RE: Can't program board when audio cable plugged into board

cory123 — Mon, 12 Apr 2021 15:44:19 GMT

I'm pretty sure I had the same problem with an identical board. When you say the connector is shorted, are you referring to the programmer connection? I'm using a tagconnect cable which may not be making a great connection. But when I unplug the headphones I can program without any problem.

When I plug in an I2C device via a header and 4cm wire I get the same problem independent of the headphone issue. It seems like the cables I'm plugging in are somehow messing with the stability of VCC and GND. I will probe with my multi-meter and report back. Thanks!

RE: Can't program board when audio cable plugged into board

Håkon Alseth — Mon, 12 Apr 2021 13:06:32 GMT

Hi,

It sounds like the connector is shorted or somehow interferes with the rest of the board.

Have you tried measuring current consumption, seeing if there's any shorts on the board?

Does this happen to more than one custom board?

Kind regards,

Håkon