Hello, well I need to use VTIME since i want to get one message frame. Basically i want to block the read on a filedescriptor until I get one complete frame and it's VTIME which is the variable telling when one frame ends. If i set VTIME to zero i do not get a complete message frame and will have to implement something(if even possible) which decodes the rawdata to modbuss frames. //Nils -----Original Message----- From: owner-microblaze-uclinux@xxxxxxxxxxxxxx on behalf of Dr. Johann Pfefferl Sent: Mon 12/22/2008 11:22 AM To: microblaze-uclinux@xxxxxxxxxxxxxx Subject: Re: [microblaze-uclinux] Uartlite timing broken?(trying to grab frames in non-canonical mode) Hello, I use the function in the attachment to get a raw serial communication channel between two devices. The function uses glib-2.0 calls but the important statements for the initialization of the serial line are simple libc calls. Hope this helps, Johann Nils Hermansson <Nils.Hermansson@xxxxxxxxxxxxxx> wrote: > Hello everyone, > have come across a problem when trying to grab modbus frames on the 2nd uart. > The problem I am having is that I am unable to grab complete frames going on the uart when using VTIME. I really do not now where to start looking for the problem is it a driver problem or is it the uart IP block which does not work. I have checked with an oscilloscope and with third part hardware that the messages on the line are correct so either it's a hardware problem on my ml505 platform or it's the uartlite driver where timing is broken. > > Interesting part is that when i change VTIME there is no big difference at all on the data I get, could it be that non-canonical mode isn't implemented in the uartlite driver? > > Has anyone else used the uarts in non-canonical mode and got it to work? > > These are my termios settings. > > bzero(&my_termios, sizeof(my_termios)); > my_termios.c_cflag=B9600 | CRTSCTS | CS8 | CLOCAL | CREAD; > my_termios.c_lflag = 0; > my_termios.c_iflag = IGNPAR; > my_termios.c_oflag = 0; > my_termios.c_cc[VMIN] = 2; > my_termios.c_cc[VTIME] = 20; > > Best regards > Nils Hermansson > -- Dr. Johann Pfefferl --------------- mailto pfefferl at gmx dot net == -o) A computer program does what you tell it to do, /\\ not what you want it to do. _\_v-
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