Thank you @lbernstone !! After setting the config, it now stays on the external 32khz crystal after deep sleep

Hi All,

I have a similar setup as described here https://esp32.com/viewtopic.php?p=130554#p130554 where I am selecting the external crystal as RTC slow clock source before going to deep sleep.

I confirm through rtc_clk_32k_enabled() and rtc_clk_slow_freq_get that the crystal is running before ...

Here are my PC specs:

OS: Win 10 Pro
Motherboard: Asus w/ Core i7 6700K
Chipset: ASMedia USB3.1 eXtensible Host Controller

It shows up as "USB JTAG/serial debug unit" under device manager > USB Devices and "COM11" under Ports

Let me know if you need any other information.

I also want to note ...

Adding a USB 2.0 hub in between works! I was able to upload on my PC. Thanks @ESP_Sprite!

I am connecting directly to the PC (USB-A to USB-C cable, no hub). I am using a USB-C connector on my board, but only using it as a USB 2.0 connection. I will try to use a USB 2.0 hub and try again.

I tried Putty but was unable to connect. The Arduino serial monitor opens fine, but no output.

I received a different error today:


serial.serialutil.SerialException: Cannot configure port, something went wrong. Original message: PermissionError(13, 'A device attached to the system is not ...

I have a custom ESP32-C3 board based on the ESP32-C3FH4, with GPIO18 connected to USB D- and GPIO19 connected to USB D+.

When connected to my PC (Win 10), it shows up as COM11 (ESP32C3 Dev Module). I put it into download mode by pulling GPIO9 low.

When flashing it with esptool, it gives a few ...