esp-idf/examples/peripherals/uart/uart_echo_rs485/main/Kconfig.projbuild

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menu "Echo RS485 Example Configuration"
config ECHO_UART_PORT_NUM
int "UART port number"
range 0 2 if IDF_TARGET_ESP32 || IDF_TARGET_ESP32S3
default 2 if IDF_TARGET_ESP32 || IDF_TARGET_ESP32S3
range 0 1 if IDF_TARGET_ESP32S2 || IDF_TARGET_ESP32C3
default 1 if IDF_TARGET_ESP32S2 || IDF_TARGET_ESP32C3
help
UART communication port number for the example.
See UART documentation for available port numbers.
config ECHO_UART_BAUD_RATE
int "UART communication speed"
range 1200 115200
default 115200
help
UART communication speed for Modbus example.
config ECHO_UART_RXD
int "UART RXD pin number"
range 0 34 if IDF_TARGET_ESP32
default 22 if IDF_TARGET_ESP32
range 0 46 if IDF_TARGET_ESP32S2
range 0 47 if IDF_TARGET_ESP32S3
range 0 19 if IDF_TARGET_ESP32C3
default 8 if IDF_TARGET_ESP32S2 || IDF_TARGET_ESP32S3 || IDF_TARGET_ESP32C3
help
GPIO number for UART RX pin. See UART documentation for more information
about available pin numbers for UART.
config ECHO_UART_TXD
int "UART TXD pin number"
range 0 34 if IDF_TARGET_ESP32
default 23 if IDF_TARGET_ESP32
range 0 46 if IDF_TARGET_ESP32S2
range 0 47 if IDF_TARGET_ESP32S3
range 0 19 if IDF_TARGET_ESP32C3
default 9 if IDF_TARGET_ESP32S2 || IDF_TARGET_ESP32S3 || IDF_TARGET_ESP32C3
help
GPIO number for UART TX pin. See UART documentation for more information
about available pin numbers for UART.
config ECHO_UART_RTS
int "UART RTS pin number"
range 0 34 if IDF_TARGET_ESP32
default 18 if IDF_TARGET_ESP32
range 0 46 if IDF_TARGET_ESP32S2
range 0 47 if IDF_TARGET_ESP32S3
range 0 19 if IDF_TARGET_ESP32C3
default 10 if IDF_TARGET_ESP32S2 || IDF_TARGET_ESP32S3 || IDF_TARGET_ESP32C3
help
GPIO number for UART RTS pin. This pin is connected to
~RE/DE pin of RS485 transceiver to switch direction.
See UART documentation for more information about available pin
numbers for UART.
endmenu