[SoftwareSerial] Enable rx-only or tx-only mode

[Harvie]

I've been in several projects, where i've run out of available pins/interrups, but i've only needed RX or TX (not both), because i've used one-way communication. Can you please add some way to use only one pin like this?:

#define DISABLED -1
SoftwareSerial myRXSerial(10, DISABLED); // RX, TX
SoftwareSerial myTXSerial(DISABLED, 11); // TX only does not need interrupts at all!

[salaiaungmyintmyat]

Instead of DISABLED as -1, I would like to change as "255" that Rx and Tx pin initialization is using uint8_t variable type. Also, "255" number is clear to used that there is no mapped pin number 255.
The program is if we declare the pin as DISABLED_PIN, the pin mode (Input or Output) declare will skip and timer table for bits will also skip.

...
SoftwareSerial RxSoftOnly(RX_PIN, DISABLED_PIN);   // Only used Rx pin
...
RxSoftOnly.begin(9600);
if (RxSoftOnly.available()) {
   char c = RxSoftOnly.read();
}

Here is the link.
https://github.com/salaiaungmyintmyat/OnePinOnly_SoftwareSerial
It can start use by including this header file and copying .h and .cpp files into your project folder.