Hi, I have a very unusual scenario of a device which has been sent to a client, was working flawlessly for several months, and then just went dead out of the blue. It's stuck just after the bootloader - when I connect to the serial port, I see this: ets Jun 8 2016 00:22:57 rst:0x1 (POWERON_RESET),bo...

Any ideas?

Hi, I'm using ESP-IDF v3.2 and my ESP code connects to a standard WiFi AP (a Linksys router). It is a WPA2 network with DHCP, pretty standard stuff. A lot of the times the connection fails at some unknown point. I'm troubleshooting where exactly. Sadly this happens "in the field", in a different cou...

@ESP_Sprite, thanks for the pointer. I tried that, but it didn't help. The only type of intervention that doesn't immediately go into the hang is if I ground pin 0 (BOOT) when I power cycle the thing, in this case it gets in serial bootloader mode. The people in the field could do this, but of cours...

It seems I've put myself in a well-engineered trap :oops: I'm using ESP IDF v3.2 and I have initialization code like this: void setup() { /* ... setup several pins ... */ int serialBaud = 115200; Serial.begin(serialBaud); /* ... ... initialize a bunch of HW and read some config from the flash, inclu...

Cool, many thanks, glad found out what's the issue with these devices.

An quick update: I implemented the LEDC thing and ESP_Angus's suspicion on XTAL was spot-on correct. I made an unused pin to output 10.000 kHz exactly, and on working devices the frequency was accurately held. On problematic devices it varied, staying mostly around 6.6-8.6 kHz but behaved erraticall...

Hi @ESP_Angus! On the non-working boards we tried reflowing pin #2 with a fine solder tip. As I said we see continuity between pin 2 and the respective side of the 5.6pF cap. It is possible of course that the connection is only made when you press the DMM probe to the pin. The crystal is 26 MHz ±30p...

Any ideas?

Hi, we are manufacturing dozens of ESP32-based devices, and most of them work perfectly. We have a few (e.g. 2% of the production run) which otherwise seem to work fine, as long as the other hardware is related, but the WiFi seems to be dead; the chip WiFi network scan results in 0 networks visible,...