Search found 37 matches

by PanicanWhyasker
Thu Sep 03, 2020 10:07 pm
Forum: Hardware
Topic: Device bricked ("csum err") after two months of service
Replies: 32
Views: 10689

Re: Device bricked ("csum err") after two months of service

Sorry, I guess I'm not helping much here (answering a 9-month old question). The root cause was never found out, but my best guess is that the high EMI noise near the ICE was the culprit and it was causing the flash chips (Winbond W25Qxxx) to execute something stupid, like to partly erase a block of...
by PanicanWhyasker
Thu Sep 03, 2020 10:00 pm
Forum: ESP-IDF
Topic: How to debug an "just after bootloader" hang?
Replies: 3
Views: 468

How to debug an "just after bootloader" hang?

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...
by PanicanWhyasker
Sat Apr 18, 2020 12:31 am
Forum: ESP-IDF
Topic: Unchanging WiFi STA RSSI value - is this a sign for WiFi problems?
Replies: 1
Views: 1234

Unchanging WiFi STA RSSI value - is this a sign for WiFi problems?

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...
by PanicanWhyasker
Fri Nov 29, 2019 7:58 am
Forum: ESP32 Arduino
Topic: Can I work-around device lockup/hang when changing Serial baudrates?
Replies: 2
Views: 901

Re: Can I work-around device lockup/hang when changing Serial baudrates?

@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...
by PanicanWhyasker
Thu Nov 28, 2019 7:02 pm
Forum: ESP32 Arduino
Topic: Can I work-around device lockup/hang when changing Serial baudrates?
Replies: 2
Views: 901

Can I work-around device lockup/hang when changing Serial baudrates?

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...
by PanicanWhyasker
Sun Jul 07, 2019 9:56 am
Forum: Hardware
Topic: What manufacturing defect can cause lack of WiFi functionality?
Replies: 9
Views: 3233

Re: What manufacturing defect can cause lack of WiFi functionality?

Cool, many thanks, glad found out what's the issue with these devices.
by PanicanWhyasker
Sat Jun 29, 2019 10:48 pm
Forum: Hardware
Topic: What manufacturing defect can cause lack of WiFi functionality?
Replies: 9
Views: 3233

Re: What manufacturing defect can cause lack of WiFi functionality?

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...
by PanicanWhyasker
Fri Jun 21, 2019 1:42 pm
Forum: Hardware
Topic: What manufacturing defect can cause lack of WiFi functionality?
Replies: 9
Views: 3233

Re: What manufacturing defect can cause lack of WiFi functionality?

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...

Go to advanced search