Hard fault

RE: Hard fault

Steri — Wed, 26 Feb 2020 13:50:39 GMT

Yes, I will, thanks for all help so far.

RE: Hard fault

Susheel Nuguru — Wed, 26 Feb 2020 08:59:02 GMT

most likely it seems like some floating or shorted wires. Please come back to us if you can reproduce it and we will try to figure out from there.

In any case double checks the schematics and connections of your kits.

RE: Hard fault

Steri — Tue, 25 Feb 2020 16:26:46 GMT

I tried to reproduce the hard fault today, but it works like before now. I am not sure what caused the hard fault problems. The most likely explanation is that some of the wires or connectors were bad and made some weird connection. When I was debugging it seemed like it stopped around the initialization of the IMU which is connected to a I2C bus, but I measured that it was no shorting on the bus while it failed.

RE: Hard fault

Susheel Nuguru — Tue, 25 Feb 2020 08:05:49 GMT

Hi Steri,

I took this case, since it seems a bit interesting.

It seems very strange that you have not changed the code and the app starting failing randomly. And disconnecting some external PCB and sensors made it work. Can you be absolutely sure if it was the external PCB's and sensors that caused it by connecting them back and see if it causes the fault.

We need to get a direction to debug here and based on the behavior of the app that you mentioned, it seems very confusing.

RE: Hard fault

Steri — Mon, 24 Feb 2020 22:37:57 GMT

In some strange way the system started working again and I dont know why. Disconnected some external pcb's and sensors and ran a blinky example with no faults. Connected it back up and flashed the original software and it runs like before. Could some bad connections or shortings cause this issue?

RE: Hard fault

Steri — Mon, 24 Feb 2020 14:53:57 GMT

I tried again today, but now it says that the fault occurs at 0x2A8E2. Yes, it seems like the last bit of the PSR is always 0xE. The system is running freeRTOS.

I noticed that some of the prints from nrfx_ppi is cut and it is only printing some of the last characters.

RE: Hard fault

Vidar Berg — Mon, 24 Feb 2020 12:30:14 GMT

Hi Arild,

I see you have already included the hardfault handling library, which is a good start. The log indicates that the fault occurred at address 0x2a912 (is unaligned) and that this happened while being inside the PendSV_IRQn interrupt. Have you tried to repeat this to see if it always triggered in this interrupt context (ie last byte of PSR==0xe)? Also, do you have an RTOS that uses the PendSV_IRQn, or is it something else?

Best regards,

Vidar