How to Set AT Port Pins
This document introduces how to modify AT port pins in the firmware for ESP32 series of products. By default, ESP-AT uses two UART interfaces as AT ports: one is to output logs (named as log port below) and the other to send AT commands and receive responses (named as command port below).
To modify the AT port pins of your ESP32, you should:
modify the pins either in the menuconfig utility or the factory_param_data.csv table;
compile the project to generate the new bin in
This document focuses on modifying the pins. Click the links above for details of other steps.
The log port and command port pins of ESP32 AT firmware can be user-defined to other pins. Refer to ESP32 Technical Reference Manual for the pins you can use.
Modify Log Port Pins
By default, the ESP32 AT firmware provided by Espressif uses the following UART0 pins to output log:
When compiling your ESP-AT project, you can modify them to other pins with the menuconfig utitlity:
UART for console output
UART TX on GPIO#
UART RX on GPIO#
Modify Command Port Pins
By default, UART1 is used to send AT commands and receive AT responses, and its pins are defined in Column
uart_rts_pin of the factory_param_data.csv .
You can change them directly in your factory_param_data.csv table:
Open your local factory_param_data.csv file.
Locate the row of your module.
uart_rts_pinto be -1 if you do not use the hardware flow control function.
Save the table.