Blocking on Reading serial port 2 on MVME162 running RTEMS 4.10.2

[AJAI KUMAR MEDHAVI]

Hi,


This is with reference to RTEMS 4.10.2 Console driver on MVME162 CPU
Board. The driver file console.c may be found in
rtems-4.10.2\c\src\lib\libbsp\ m68k\mvme162\console


I am trying to receive and write messages on both Console Port ( serial
port 1) and tty00 (serial port 2) .


When Console port is 1 (as given in rtems_io_initialize in console.c at
the time of registering device "/dev/console" with minor no. 0 )

Here :

-- I am able to receive / write messages from/to  console port (serial
port 1) by using

printf("\n\nWriting on Console / Serial Port 1");
	respmsg[0]=0x31;
	respmsg[1]=0x31;
	respmsg[2]=0x31;
	respmsg[3]=0x31;


	len = write(STDOUT_FILENO, &respmsg[0], 4);
	if(len == 4)
	printf("\nWriting on Serial Port 1 successful");




 -- Able to Open "/dev/tty00" and write successfully on serial port 2 (tty00)


 -- But not able to receive message on serial port 2 (tty00), it is
indefinetly blocking


Here for serial port 2,  I have used following code :

/*----open Console serial port 2 and write/read messages----------*/
	fd2=open("/dev/tty00",O_RDWR | O_NOCTTY | O_NONBLOCK);
	if (fd2 <0) {
	perror("/dev/tty00");
			close(fd2);
		}
		else {
			printf("\nPort /dev/console is opened");
			printf("\n\nfd2 Value = %d",fd2);
			/*fcntl(fd2, F_SETFL, 0);*/
		}

		fcntl(fd2, F_SETFL, 0);

		/*-----get the current options--------------------*/
		if(tcgetattr(fd2, &options) < 0)
			printf("\nError in getting tty00 settings");
        else {
			/* setting the baud rate */
			cfsetispeed(&options, B9600);
			cfsetospeed(&options, B9600);

			/* set raw input, 1 second timeout
			options.c_cflag |= (CLOCAL | CREAD);
			*/

			/* 8N1, no parity */
			options.c_cflag &= ~PARENB;
			options.c_cflag &= ~CSTOPB;
			options.c_cflag &= ~CSIZE;
			options.c_cflag |= ( CS8 | B9600 );

			/*options.c_cflag &= ~(CRTSCTS);*/			/* no hardware flow control */
			/*options.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);
			options.c_oflag &= ~(OPOST);
			options.c_cc[VMIN] = 0;
			options.c_cc[VTIME] = 10;
			*/

			/* set the options */
			tcsetattr(fd2, TCSANOW, &options);
		}

		printf("\n\nWriting on Serial Port 2");
		respmsg[0]=0x32;
		respmsg[1]=0x32;
		respmsg[2]=0x32;
		respmsg[3]=0x32;


		len = write(fd2, &respmsg[0], 4);
		if(len == 4)
			printf("\nWriting on Serial Port 2 successful  transmitted 4 bytes");

		else{
			printf("\nWriting on Serial Port 2 failed");
			printf("\nBytes trnasferred %d", len);
		}

		printf("\nReceiving message2 from serial port 2\n");
		nbytes = read(fd2, buf2, sizeof(buf2));
		printf("Message2 read = %s\n", buf2);


Even after re-setting tty00 filedesc as given below , the problem remains
same




Does anyone have an advice of what's wrong with the code ( whether in
application and / or console.c driver)


How to fix the problem of reading on the serial port 2 ?


Thank you very much in advance and kind regards,




Please find application code  as given below :




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