esp-idf/examples/peripherals/dedicated_gpio/soft_uart/main/Kconfig.projbuild

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menu "Example Configuration"
orsource "$IDF_PATH/examples/common_components/env_caps/$IDF_TARGET/Kconfig.env_caps"
config EMULATE_UART_GPIO_TX
int "GPIO pin for UART TX"
range ENV_GPIO_RANGE_MIN ENV_GPIO_OUT_RANGE_MAX
default 0 if IDF_TARGET_ARCH_RISCV
default 16
help
GPIO pin number to be used as UART TX.
config EMULATE_UART_GPIO_RX
int "GPIO pin for UART RX"
range ENV_GPIO_RANGE_MIN ENV_GPIO_OUT_RANGE_MAX
default 2 if IDF_TARGET_ARCH_RISCV
default 17
help
GPIO pin number to be used as UART RX.
endmenu