ESP32-WROVER-E - No serial data received

[Korhyu]

Hi everyone!
My name is Jose and this is my first PCB using ESP32, USB type C and USB to UART programing on board.

I make this PCBs using a Chinese supplier and I don’t know if there is something wrong whit the PCBs or whit my hardware design.

I am using the Visual Studio Code + Platformio for design the soft and programing the ESP.

The schematics and error are attach to this post.

There are 2 differences between the schematics and the real PCBs.
One is the addition of two R in CC1 and CC2 of the USB, I put two resistors of 5,1kohms between this pins and GND.
The other is a 10uF capacitor in parallel to the C31 because I read in some forums that this can help to get in the boot mode of the ESP32.

Code: Select all

Advanced Memory Usage is available via "PlatformIO Home > Project Inspect"
RAM:   [=         ]   8.8% (used 28960 bytes from 327680 bytes)
Flash: [=======   ]  71.2% (used 932725 bytes from 1310720 bytes)
Configuring upload protocol...
AVAILABLE: cmsis-dap, esp-prog, espota, esptool, iot-bus-jtag, jlink, minimodule, olimex-arm-usb-ocd, olimex-arm-usb-ocd-h, olimex-arm-usb-tiny-h, olimex-jtag-tiny, tumpa
CURRENT: upload_protocol = esptool
Looking for upload port...
Auto-detected: COM14
Uploading .pio\build\upesy_wrover\firmware.bin
esptool.py v3.3
Serial port COM14
Connecting......................................

"A fatal error occurred: Failed to connect to ESP32: No serial data received."
For troubleshooting steps visit: https://docs.espressif.com/projects/esptool/en/latest/troubleshooting.html
* [upload] Error 2

1.JPG (167.34 KiB) Viewed 3056 times

2.JPG (126.28 KiB) Viewed 3056 times

And this are the signals.
The yellow its the IO0 and the blue its the EN, all refered to the schematics.

WhatsApp Image 2022-08-23 at 3.18.14 PM.jpeg (110.43 KiB) Viewed 3056 times

This signals apear when i try to upload the code to the ESP.

The error as you can se abobe its "A fatal error occurred: Failed to connect to ESP32: No serial data received."

I don’t know if the fault it’s from the hardware or what.
Can anybody help me?
If I forgot to say something or do you need any other data to understand the problem please let me know.
Thanks


Thanks

[ESP_Sprite]

You have the TX of the USB-serial going to the TX of the ESP32; same for RX. These should be swapped: TX should go to RX and RX should go to TX.

[Korhyu]

So... obvious... so naive.... so... stup****
Thanks... i will try to modify the PCB and let you know if this was the problem.