Serial.begin(,,SERIAL_TX_ONLY) doesn't works

[stephjj]

Hello,

If I use Serial.begin(,,SERIAL_TX_ONLY) to use GPIO3 as a LED output on ESP-01, I got no output on TX.
But GPIO3 is usable with digitalWrite.

In uart.c (line 174), the tx_pin is set to 255 if rx_enable is false.
If I set it to 1, every thing is working fine.

Thanks.

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[looxonline]

I was actually about to post about this myself. Thanks for your hard work Igrr!

[igrr]

I have attempted to fix this in #2141.