How do I wake up ESP32S3 from 10MHz CPU clock?
# helpr
RaspPi Parts
07/15/2025, 4:04 PMHello ESP32S3 Experts,
I use Arduino IDE v2.3.6 to programme my ESP32S3 board. I set its system clock to 10MHz with the official ESP32 board manager. Codes are good and programming was successful.
However, my board fell into Super Deep Sleep and cut the power of the USB serial port. Then, I cannot programme it any more. Please help me to wake it up! 😴 👎
My ESP32S3 board have hardware PWK button, Boot button, Reset Button, Flash Button, etc. I think they can cure it. 😒
I know here are many ES32S3 experts. 🙏
f
floitsch
07/15/2025, 4:14 PMNormally, pressing boot and then reset should start the device in flash mode. I would be surprised if a changed system clock is already active at that time (but I could be wrong).
Let me do some googling.
floitsch
07/15/2025, 4:24 PMI didn't find much more, so I would definitely start with:
- reset. That should definitely get it out of sleep mode.
- boot + reset (first press boot; keep it pressed. Then press/release reset; then release boot). That should get it into flash mode, so you can write a different firmware onto it.
I'm surprised you have a "flash" button. I have never seen a board with that. (I have also never seen a PWK button on my boards).
r
RaspPi Parts
07/15/2025, 4:45 PMokay! Thanks. Let me try. 😀 🤝
RaspPi Parts
07/16/2025, 4:37 PMWe like cheap China ICs but the tariffs are sky high now. WT~! 😒
RaspPi Parts
07/30/2025, 3:33 PMsolved.