Is it possible to programatically hold the serial port Tx line high or low in C?-CodePudding

This is the relevant part of my C program (in Linux):

while (input != ' '){
 write(serial_port, msg, sizeof(msg));
 //1. here I would like to wait at least 100 us with the Tx line high
 //2. followed by at least 8us with the Tx line low
 //3. and then repeat the message
 input = mygetch();
}

As you can see, after each send of msg through the serial port, I would like to set the Tx line high for 100 microseconds and then low for 8 microseconds and then repeat the message until the user presses the space-bar.

Do I have this kind of control on the serial port using C in Linux?

TIA for your help.

CodePudding user response：

Yes. The default state of a serial line when not sending any data is "mark" (high, for a single-ended line). To send a space (low), set the break bit. Clear the break bit to restore the idle state.