Monks, your wisdom is required
I am writing to an embedded system over a serial port. The system is extremely limited and writing to it any faster than 50ms per character causes data to be dropped/lost.
My code is as follows
sub configPort($,$){
        my $port = ($_[0]);
        my $refConfigHash = ($_1);
        $$port->baudrate($refConfigHash->{portBaudRate}) || die "Cannot Set Baud Rate \n";
        $$port->databits($refConfigHash->{portData})     || die "Cannot Set Data Bits \n";
        $$port->stopbits($refConfigHash->{portStopBits}) || die "Cannot Set Stop Bits \n";
        $$port->parity($refConfigHash->{portParity})     || die "Cannot Set Parity \n";
	$$port->handshake("none");

        $$port->read_char_time(0);  	   	# don't wait for each character
        $$port->read_const_time(1000); 		# 1 second per unfulfilled "read" call
	$$port->get_tick_count;
        $$port->write_settings;
}


sub subSerialPortWrite($,$){
	my $port = ($_[0]);
	my $buffer = $_1;
	my $i;
	$$port->write("\r");
	for($i=0;$i<=length($buffer);$i++){
                $$port->write(substr($buffer,$i,1));
                Time::HiRes::usleep(50000);
        }
}

What I believe is happening is that each character gets buffered and finally the entire string gets spit out to the serialport at once, which of course cannot respond fast enough.
My questions are
1. Am I right?
2. If so, how do I work around it?
3. If not, what is my problem and how do I fix it?

I'm using perl version 5.10.0
Please help Thanks

In reply to Writing to serial port with a delay between each character by sidthakur

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