метод записи в порт

gistfile1.c

void ConnectionManager::need2send(QByteArray b){
	turn2Write();
	int sended = write(fd, b.data(), b.size());
#ifdef QT_DEBUG
	if (sended != b.size())
		QLOG_ERROR()<<"!!!!!!!!!!!!!NOT ALL SENDED!!!!ONLY: "<<sended;
#endif
		tcflush(fd, TCOFLUSH);
 	opt.c_cc[VMIN] = sended;		/* Minimum bytes available */
 	tcsetattr (fd, TCSANOW, &opt);

 	int readed = 0;
 	char r[sended];
 	int count;
 	count = 0;
 	msleep(sended+2);
 	while (count<100 && readed<sended){
 		count++;
 		int c = read (fd, r, sended);
 		if (c<0)
 			perror("error while reading");
 		if (c>0){
 			readed  += c;
 		}else{
	 		msleep(1);
 			#ifdef QT_DEBUG
 				QLOG_WARN()<<"SLEEP!!! read = "<<readed;
 			#endif
 		}
	 }
	 // msleep(1);
	startReading();
}