ESP32 Forum

Hi,

I'm working on a project, and sometimes, the ESP32 is stuck hanging forever.
I checked and no I2C running, no MQTT running, so it seems the full system is stuck.
I tried attaching JTAG when this happens, but I have errors starting it.
I also have all watchdog enable (interrupt, iddle1/0) with panic trigger, and they are not triggered.
A press on the reset button is unlocking everything.

I'm running my code on a WROOM-32 (custom PCB), with ESP-IDF v4.0

So my questions would be :
* What could be happening ?
* Any solution to be able to see what's the system status when this happens ?

Hard to say. May be that your program is running in a state that is technically valid but just doesn't output anything... You could hook up a timer or a button to an interrupt and crash the system using that; that should give you a panic and a backtrace or core dump.

Thanks ESP_Sprite,
I setup an interrupt that will crash the system if button is pressed. I just need to wait now.
I'll update the post once reproduced.

Hi @ESP_Sprite, since it's hard to reproduce, I wanted to know if there is something specific I could check HW wise when this happens. As it's a custom PCB, we want to rule out design issue.

Nothing hardware-wise comes to mind that could cause a symptom like this, sorry... most I can come up with is that you might be able to check the 40MHz crystal, see if it oscillates when the chip is hung like that.

Hey guys,

We are currently experiencing a very similar issue. we have it reproducing only once in a while.
we are running 300 devices for testing this issue and we get approx 2-3 new hang devices every day

We have measured the external crystal to check it's behavior in 3 devices. we got a different result on each one, as follows:




while a working devices behaves as follows:


Does anyone have any idea what this is happening?

Thanks

Hard to say... can you tell us more about your design? Schematics, what components do you use, how did you select the crystal / load capacitors, any other relevant information?