Search found 87 matches

by markwj
Tue Jul 16, 2019 2:26 pm
Forum: Hardware
Topic: ESP-WROOM-32 and extending the flash
Replies: 10
Views: 5040

Re: ESP-WROOM-32 and extending the flash

Hi, I am SPIFFS library to store the data received from bluetooth into flash.At the same time two timer interrupts are working. But I am facing an issue , both timer interrupts and SPIFFS crash the ESP32 and shows an error 'Guru Meditation Error: Core 1 panic'ed (Cache disabled but cached memory re...
by markwj
Thu Apr 25, 2019 2:12 am
Forum: ESP32 IDF
Topic: Faster, optimized ESP-IDF fork + PSRAM Issues
Replies: 21
Views: 4040

Re: Faster, optimized ESP-IDF fork + PSRAM Issues

ESP_Sprite wrote:
Thu Apr 25, 2019 2:06 am
I'm hoping I can find time to finally finish this in the next few weeks.
Thanks for the update. Very helpful.

If/when you get a toolchain, please let us know. This is impacting us quite badly.
by markwj
Thu Apr 25, 2019 1:45 am
Forum: ESP32 IDF
Topic: Faster, optimized ESP-IDF fork + PSRAM Issues
Replies: 21
Views: 4040

Re: Faster, optimized ESP-IDF fork + PSRAM Issues

We're coming into 4 months after this bug was reported, but no movement on the GitHub issue.

This is a fundamental random memory corruption fault that is causing all sorts of issues. Can we get a resolution, or at least an update as to what is going on?
by markwj
Fri Aug 31, 2018 12:19 am
Forum: Hardware
Topic: ESP-WROOM-32 and extending the flash
Replies: 10
Views: 5040

Re: ESP-WROOM-32 and extending the flash

We wasted about a year with external flash. It works ok on WROOM32 (in DIO mode), but just too much trouble on WROVER32 (due to no spare 1.8v GPIO for CS, 1.8v not exposed externally, level shifting, hard-coded firmware not supporting it, etc). My recommendation is to use modules with 16MB flash alr...
by markwj
Mon Aug 13, 2018 5:02 am
Forum: Report Bugs
Topic: Corrupt MAC address in efuse
Replies: 5
Views: 2688

Corrupt MAC address in efuse

espefuse output is showing: Identity fuses: MAC MAC Address = 30:ae:a4:53:dc:b1 (CRC b2 invalid - calculated 0x3d) R/W and that causes a fatal error on boot: I (659) system_api: Base MAC address is not set, read default base MAC address from BLK0 of EFUSE E (669) system_api: Base MAC address from BL...
by markwj
Thu Jul 05, 2018 11:43 pm
Forum: Showcase
Topic: ESP32 with GSM modem - PPP over Serial (PPPoS) client example
Replies: 32
Views: 39803

Re: ESP32 with GSM modem - PPP over Serial (PPPoS) client example

What is the expected output of this PPPOS? I have interfaced GSM module(from simcom) with ESP32 and ESP32 is in WIFI AP mode. I need internet access to devices which are connected to ESP. A wifi hotspot? What you would need is: A router for messages going between the two interfaces. To do Source NA...
by markwj
Wed Jun 06, 2018 1:48 am
Forum: ESP32 IDF
Topic: Wifi AP scanning in AP mode
Replies: 3
Views: 3076

Re: Wifi AP scanning in AP mode

Scan can be done in AP+STA mode, but it will interrupt the AP activity while scan is in progress. AP+STA in general works well. You can even leave the STA side idle (just used for scanning, etc) while the AP is running. Only issue is that you can't leave the AP idle (if unconfigured, it just starts ...
by markwj
Wed Jun 06, 2018 1:46 am
Forum: General Discussion
Topic: presoldered ESP32 module
Replies: 11
Views: 2772

Re: presoldered ESP32 module

Here is an example of a WROOM .... https://www.ebay.com/itm/ESP32-WROOM-32D-ESP32-Rev1-module-with-Integrated-Antenna/252790625860?epid=12007271706&hash=item3adb7ed644:g:RI8AAOSw32lYtNZr The pinspacings are small (1mm?) but MUCH larger than a raw ESP32 IC. Here is a mounting board with breadboard s...
by markwj
Wed Jun 06, 2018 1:43 am
Forum: General Discussion
Topic: presoldered ESP32 module
Replies: 11
Views: 2772

Re: presoldered ESP32 module

How about one of these? Not sure how well it holds the module as I've never seen one in person. https://www.aliexpress.com/item/ESP32-test-board-batch-burn-fixture-for-ESP32-WROVER-IPEX-Version-ESP-32-ESP-32S-ESP32/32851571106.html John A For prototyping that is just fine - it holds the module in v...
by markwj
Wed Jun 06, 2018 1:41 am
Forum: General Discussion
Topic: what do you use for timezone management?
Replies: 2
Views: 1280

Re: what do you use for timezone management?

We're having the same issue. Unable to find a simple library to convert something like USA/NewYork to posix timezone strings. It seems that bigger systems use the tzdata and full library, but that is too large for ESP32. Could probably parse the tzdata files to extract what we need, and wrap it in a...

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