nrf52832 not working outside debugger.

[Arne Laugstøl]

Hi

I have a wired situation in my project. Everything is working fine when I am running my heart-rate device with the debugger. When I detach the debugger or just power-cycle the device behaviour becomes wired. The device still advertise, so I can see it from my phone. But, when I try to connect to it from my phone, it will not connect anymore. If I do "connect jLink" from Segger studio, then everything works fine again.

I am using SEGGER_RTT_WriteString a lot, and I suspected that it could be that the output to the debugger via SWD was blocking when I am not running the debugger. So, I have checked in my code that I am doing SEGGER_RTT_Init() at start, and I have set the SEGGER_RTT_CONFIG_DEFAULT_MODE to 0 (i.e SKIP when buffer is full).

I am using nRF52832 with our own HW, Segger Studio and j-Link Ultra. The sdk version 14.2.0.

Any idea where to start looking for a solution?

Regards Arne

[Nguyen Hoan Hoang]

RTT require the JLink be connected all the time. You need to disable RTT for stand-alone.

[RK]

not I who says so - it's Segger who says so and they wrote RTT. They explicitly made it so it's low overhead and you're able to leave it in your code whether connected or not for exactly this reason. No I don't know what the original poster's issue is and they are going to have to look into it some more, however just making statements like "RTT requires the JLink to be connected all the time" which is factually incorrect doesn't really help does it.