FreeRTOS Blinky stops

[Michael]

I've been trying to run the FreeRTOS blink example on a custom board.

After some time (I have not yet been able to determine exactly how long - but somewhere in the range 20-60 minutes I think) the device stops blinking.

Running on a PCA10056 board works fine. The only changes to the example has been to change from LED0 and LED1 to LED2 and LED3 which matches where I have LEDs on my custom board.

Out custom board does not have an LF clock, we only have a HF clock Can that be the issue?

[Michael]

Forgot to mention. Our code base currently is using SDK 15. 

[Vidar Berg]

Hello,

I can't think of any obvious reasons for this. I assume you changed the CLOCK_CONFIG_LF_SRC and CLOCK_CONFIG_LF_CAL_ENABLED to use the internal RC oscillator?

When the device stops blinking, could you attach the debugger and read the CPU registers to try determine what state the device is in (if it's stuck in a fault handler, etc)?

Reading CPU registers from running target using nrfjprog:

nrfjprog --readregs

[Michael]

Currently I have not changed anything from the PCA10056 (building from the same directory) setup. Will have a look at those two configs.

If problem persists I will have a look at the registers

[Vidar Berg]

Correction: You probably won't find the CLOCK_CONFIG_LF_CAL_ENABLED setting in your project as it seems to have been introduced in a later SDK version (I was looking at the example in SDK 17.0.2)

[Michael]

This solved the issue.... I thought the LF clock had something to do with it, but couldn't find what to look for... Thanks.... 

Using RC or synth as LF clock source worked like a charm.

[Vidar Berg]

I'm still not sure how this could cause the program to suddenly stop operating after several minutes. Anyway. Thank you for the update, I'm glad to hear that it works now. 

[Michael]

Yes,the fact that it worked at all - but for a while was a bit perplexing.