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Old 11-01-2007, 04:45 AM   #1
madhivadhana
LQ Newbie
 
Registered: Oct 2007
Posts: 2

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Question Rs 232 pgm - Please help


Hi,
I am a newbie. I have to do Linux rs232 programming to connect a device.
the device settings,
9600, 7 bit, 1 start bit, 1 stop bit, Even parity.

I have written the below code. But there is no response.
Please, .. someone help me. I am very much struck in this.
*************************************************
struct termios newtio;
struct timeval tv;
int retval;

char buf[255];



FD_ZERO(&read_set);

tv.tv_sec = 5;
tv.tv_usec = 0;
fd=open("/dev/ttyAM1",O_RDWR | O_NOCTTY |O_NDELAY);
if(fd < 0)
{
fprintf(stderr, "Unable to open /dev/ttyAM1");

exit(1);
}
fcntl(fd,F_SETFL,FNDELAY);




cfsetispeed(&newtio,B9600);
cfsetospeed(&newtio,B9600);
newtio.c_cflag |= CREAD;

newtio.c_cflag |= CLOCAL;
newtio.c_cflag |= PARENB;

newtio.c_cflag &= ~PARODD;
newtio.c_cflag |= ~CSTOPB;
newtio.c_cflag &= ~CSIZE;
newtio.c_cflag |= CS7;

newtio.c_cflag &= ~CRTSCTS;
newtio.c_iflag &= ~(IXON | IXOFF | IXANY | ICRNL | IGNCR);
newtio.c_lflag &= ~(ICANON | ECHO | ISIG );
newtio.c_oflag &= ~(OPOST | ONLCR | OCRNL | ONLRET);



tcsetattr(fd,TCSANOW,&newtio);


FD_SET(fd,&read_set);
write(fd,&cmd,sizeof(cmd));


retval = select(fd+1,&read_set,NULL,NULL,&tv);
if(retval)
{
printf("Data is available");
res=read(fd,buf,255);
printf("\n");
printf("%d\n",res);
for(i=0;i<res;i++)
{
printf("%x",buf[i]);
}
}
else
printf("No data within five seconds");


printf("retval=%d",retval);
close(fd);
**********************************************************
Regards,
Madhi.
 
Old 11-02-2007, 02:18 AM   #2
ehawk
Senior Member
 
Registered: Jul 2003
Posts: 1,257

Rep: Reputation: 48
possibly useful links

http://www.agsrhichome.bnl.gov/Contr...Ado_Digi_.html

http://lpccomp.bc.ca/remserial/

The following link looks quite promising:

http://www.egr.msu.edu/classes/ece48...ote_wa-jiw.pdf

This product includes a free trial period:

http://www.dcbnet.com/notes/0006etherpathredirect.html

Also try posting to justlinux.com if you haven't already. They seem quite well informed.
 
  


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