Serial.swap() only for RX?

[rin67630]

Does a solution exist on the ESP8266 to perform a Serial.swap only for Rx?
I am short on pins and need GPIO15 for another purpose.

[hobby_guy]

You can repurpose the RX and TX pins independently: https://arduino.stackexchange.com/quest ... -gpio-pins

In my project, using ESP-1 (which only exposes/breaks out GPIO0 and GPIO2), I have remapped RX (GPIO3) as an output. This allows me to still use Serial.println for debugging. Also, interestingly, it still works to flash the device even when there is a resistor and an LED connected to the RX pin

[rin67630]

You can repurpose the RX and TX pins independently: https://arduino.stackexchange.com/quest ... -gpio-pins

In my project, using ESP-1 (which only exposes/breaks out GPIO0 and GPIO2), I have remapped RX (GPIO3) as an output. This allows me to still use Serial.println for debugging. Also, interestingly, it still works to flash the device even when there is a resistor and an LED connected to the RX pin

That appears to be specific to the ESP-1
With the ESP-12 I'm not aware of another repurpose instruction.

[hobby_guy]

I would expect it works on the ESP8266 chip, regardless of breakout board... As far as I know, it's the same chip on all the 8266 breakouts? Did you try it on the ESP-12? Would be interesting to hear if it works. I could try it on an Adafruit Huzzah 8266.

[rin67630]

I would expect it works on the ESP8266 chip, regardless of breakout board... As far as I know, it's the same chip on all the 8266 breakouts? Did you try it on the ESP-12? Would be interesting to hear if it works. I could try it on an Adafruit Huzzah 8266.

That appears to liberate the TX pin for use as a GPIO only if you never uses any Serial() or Serial.read() command.
But I need to read from Serial. Just don't need to TX.

[hobby_guy]

Well, in my case, I use the RX pin as a third GPIO (the ESP-1 is a very small breakout). Point is, I can still use TX pin to transmit serial at the same time

[rin67630]

Well, in my case, I use the RX pin as a third GPIO (the ESP-1 is a very small breakout). Point is, I can still use TX pin to transmit serial at the same time

That is the opposite.
I just would want to liberate the TX pin that is not used and pulled up with 470 Ω, which draws quite a respectable quantity of energy