unset uart_set_pin on ESP32E

[Ildar Belkin]

Hello.
uart_set_pin is mandatory part of configuring UART.
How to unset pin? UART API has no uart_unset_pin() or other way to do this.

The ESP32 UART manual in part where uart_set_pin() described says:
"The same macro UART_PIN_NO_CHANGE should be specified for pins that will not be used."
I didn't understand how to use it to unset pins.


The problem is that I get an error during my code when use uart_set_pin() again:
uart: GPIO xx is not usable, maybe used by others


My code should twice init uart->install driver->set_pin->delete driver->deinit port


Please, advise me a solution.

[Sprite]

What GPIO are you using, on which chip?

[Ildar Belkin]

18 for TXD and 19 for RXD. ESP32-WROOM-32E.

The project no uses WiFi or BLE or SPI, but uses I2C

uart: GPIO 18 is not usable, maybe used by others

I use 2 UARTs: one for GNSS, one for sattelite modem.
Error appear only when GNSS (18 pin) is initialized second time (after deinit and deinstall driver from first time).