ESP32 Forum

Hello! I was trying to burn firmware that would allow me to send AT commands via UART to the ESP32 Pico kit. I was able to successfully burn the firmware (esp-at.bin, if I selected the right one) using the download tool:

https://pasteboard.co/K92eKnA.png

I then opened up RealTerm to send a serial command to the same port (I tried +AT, which seemed the easiest) but didn't get anything back. I suspect I might actually need to use another serial port to send data to the board but I wasn't sure how the code was configured.

Not sure if it helps, but this is the schematic:
https://dl.espressif.com/dl/schematics/ ... ematic.pdf

Should I be able to send AT commands over the USB/UART or should I be sending them to a different port? I assume I'm probably doing this wrong but I'm having trouble finding any documentation on what to do AFTER flashing the firmware (I am under the assumption I did that part right).

If you have any other ideas or suggestions, please let me know. Any documentation that might point to the answer to this would be greatly appreciated (a number of links in AT related documentation seems to no longer exist or have outdated links). Thanks!

This is the latest, in case you have not found this already:
https://docs.espressif.com/projects/esp-at/en/latest/

The IOs used for AT commands and normal debug output/flashing will be different. More on that here:
https://docs.espressif.com/projects/esp ... index.html

For using other GPIOs for AT UART, I think you will need to re-build the firmware with changed pin numbers.
I was trying to build the SDIO mode AT firmware and it was an absolute pain in the back. So if you are using UART AT and can use the pins specified above, that is a life saver.