AT firmware not working

[ppetkov]

I am new to esp32.
I would like to use ESP32 WROOM together with TM4C129 microcontroller in my new project and I need AT commands to communicate with ESP32.
I have used flash_download_tools_v3.6.6.exe to download AT Firmware into ESP32 Flash as this is decribed in esp32_at_instruction_set_and_examples_en.pdf - #1.2
using default debug UART0 connected to the PC via UART to RS232 converter.
I have used two buttons connecter to EN and IO0 to enter in bootloadin mode.
After finish of downloading and restarting I receive "Ready" on UART1 ( default AT commands UART) and I receive echo on the commands I sent ( each command ends with CR-LF), but I not receive "OK" and commands are not executed at all.

Where I have to read about this issue?

Thank you in advance!

[Helen L]

"ready" and the command echo should mean that the AT firmware works fine. Did you send the AT command via UART1? If so, I guess the problem may be on the new line "CR-LF", maybe you can try with another serial tool.

[ppetkov]

Thank you very much Helen L !
The problem was in the PC terminal I have used.
When I send commands from my microcontroller ( for example "AT+RST\r\n") I receive response from the ESP32.
Thank you again!

[mikes_md]

Hi All,

Did you mean to say 'UART2' for the AT commands? (ie GPIO 16/17)?

The datasheet for ESP32-WROOM says that UART1 is for integrated SPI Flash?

I just received a few ESP32-WROOM-32Ds, and am trying to get the AT working as well... but I was trying against the stock flash it came with, does anyone know what flash they are loaded with? is it something else, not AT?


Thanks,

- Mike