RE: serial IO Interface revisited.
Let me ask another question.
How is framing error handled? can I test for framing errors before I read the bytes from the serial buffer?, i.e is is there a user program flag?
Much thatns.
--- On Fri 03/10, Robbie < sheriff@excite.com > wrote:
From: Robbie [mailto: sheriff@excite.com]
To: debian-embedded@lists.debian.org
Date: Fri, 10 Mar 2006 13:06:49 -0500 (EST)
Subject: serial IO Interface revisited.
HHi All, below is how I set up my serial device:
The problem I'm having is that I've noticed (using a serial spy software) that I'm missing some bytes between messages and sometimes I would read only one nibble of the next byte. I've looked at several docs and I can't see why that's happening. The sigio handler simply copies the read bytes to another buffer.
Please Help.
Thank You.
Robbie
sio_fd = open(MODEMDEVICE, O_RDWR | O_NOCTTY | O_NONBLOCK);
if(sio_fd < 0) {
perror(MODEMDEVICE);
return 0;
}
/* installing signal handler */
saio.sa_handler = signal_handler_IO;
saio.sa_flags = 0;
saio.sa_restorer = NULL;
sigaction(SIGIO, &saio, NULL);
/* allowing process to receive signal & make async */
fcntl(sio_fd, F_SETOWN, getpid());
fcntl(sio_fd, F_SETFL, FNDELAY);
fcntl(sio_fd, F_SETFL, FASYNC);
tcgetattr(sio_fd, &oldtio);
cfsetispeed(&newtio, B9600);
cfmakeraw(&newtio);
tcflush(sio_fd, TCIOFLUSH);
tcsetattr(sio_fd, TCSANOW, &newtio);
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