For anyone stumbling across this thread from a search (it's the first result for a lot of combinations of "0x212" & "BLE Nimble terminate connection" & "esp32"), the OP has found a solution here: https://github.com/espressif/esp-idf/issues/8555

What exactly are you seeing on the serial terminal? Is the chip actually in download mode when you try to flash it? Do you have a ground connected to the TTL converter? In order to be reprogrammed, the programmer will usually put the chip in download mode by resetting the chip while holding GPIO0 lo...

Hey All! In a recent project, I was having issues with jitter caused by all of the ESP-IDF I2C driver's heap allocations. It looks like there's currently work going into updating this driver to allow static allocation in the ESP-IDF repo, but unfortunately I'm stuck on ESP-IDF 4.3 right now so I can...

Are you using WiFi or Bluetooth or BLE? Those all create high-priority tasks on CPU 0. You can try using xTaskCreatePinnedToCore to pin your gpio task to a specific core. If you're using gpio_install_isr_service, you can also pass that ESP_INTR_FLAG_IRAM to ensure that your ISR is called when the ca...

It might also be worth trying ESP32's assembly high-level interrupts. I've never used them personally, but they can allegedly give interrupt latencies that are significantly lower than the ~2us for regular ESP32 C interrupts. See: https://esp32.com/viewtopic.php?t=422 See: https://docs.espressif.com...

I've re-tested everything on the WROVER-KIT with the 10M resistor between XN and XP, and it's been reliably running for an entire day now. (!!!) Maybe the flux/alcohol on the resistor hadn't fully dried when I first tested it. The XN/XP differential on the WROVER-KIT looks something like this, const...

I've tried adding a parallel 10MOhm resistor across the 32.768k crystal on the ESP-WROVER-KIT. I've attached a photo of the resistor, and confirmed that it is properly soldered in place. With it in place, the measured resistance across the crystal is now ~6MOhm. This did not fix the problem: I still...

Was there any solution found for this? I also have a ESP-WROVER-KIT-V4.1 and I'm seeing the same behavior. No matter what clock settings I select, I see: W (551) clk: 32 kHz XTAL not found, switching to internal 150 kHz oscillator I've tested continuity, and I can confirm that the 32.768kHz crystal ...