ESP32-U4WDH 'No serial data received'

Vitaly
Posts: 7
Joined: Wed Feb 23, 2022 1:52 pm

ESP32-U4WDH 'No serial data received'

Postby Vitaly » Tue Jan 21, 2025 7:57 pm

When power is supplied, there is no message in the monitor.
After a hardware reset, there is no message in the monitor.
No response to TX
Power supply: 3.3v/0.6a
Adapter: CP2102
I bought 25 chips, assembled 3 identical devices - all three are silent.
I can't figure out what I'm doing wrong.
Sketches attached
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ESP_Sprite
Posts: 9883
Joined: Thu Nov 26, 2015 4:08 am

Re: ESP32-U4WDH 'No serial data received'

Postby ESP_Sprite » Wed Jan 22, 2025 12:50 am

I strongly suggest you go over the esp32 hardware design guidelines and see if your schematics match that. For instance, it says:
External Crystal Clock Source (Compulsory)

The ESP32 firmware only supports 40 MHz crystal.
and that is just one of a bunch of things I see you not doing in your schematic.

Vitaly
Posts: 7
Joined: Wed Feb 23, 2022 1:52 pm

Re: ESP32-U4WDH 'No serial data received'

Postby Vitaly » Wed Jan 22, 2025 10:07 am

So, in the absence of an external crystal 40MHz, it is impossible to read the chip ID? The internal 8 MHz generator does not support the serial port?

Vitaly
Posts: 7
Joined: Wed Feb 23, 2022 1:52 pm

Re: ESP32-U4WDH 'No serial data received'

Postby Vitaly » Wed Jan 22, 2025 10:20 am

So, thanks for the consultation, I am satisfied

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