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RS232 programming problem
Post 302246876 by dudi.forum on Tuesday 14th of October 2008 03:36:14 PM
10-14-2008
Thanks for you replay
Thanks for you replay
I think I was not describing my problem properly,
I Run the READ process first, and then the WRITE process
I write the code following the Serial Programming guide:
http://www.faqs.org/docs/Linux-HOWTO/Serial-Programming-HOWTO.html
Because I open the device file /dev/ttyS0 with the flags then the read system call is blocked. mean that the read is blocked until there is data in the file descriptor (no need to poll, unless I need to poll between 2 files descriptors)
The problem might be partially solved (for the first time running the read process) by flushing the rx buffers by the code:
tcflush(fd , TCIOFLUSH ); //this code is supposed to flush out the content of write buffer of the file descriptor fd.
However, process READ still get (sometimes) only part of chars what process WRITE writing to the fd.
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LEARN ABOUT LINUX
uark
UARK(4) BSD Kernel Interfaces Manual UARK(4) NAME
uark -- Arkmicro Technologies ARK3116 based USB serial adapter SYNOPSIS
To compile this driver into the kernel, place the following lines in your kernel configuration file: device uark device ucom Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5): uark_load="YES" DESCRIPTION
The uark driver supports Arkmicro Technologies ARK3116 based serial adapters. HARDWARE
The uark driver supports the following adapters: o HL USB-RS232 o HugePine USB-UART o KQ-U8A Data Cable o Skymaster USB to RS232 SEE ALSO
tty(4), ucom(4), usb(4) HISTORY
The uark device driver first appeared in OpenBSD 4.0. The first FreeBSD release to include it was FreeBSD 7.0. AUTHORS
The uark driver was written by Jonathan Gray <jsg@openbsd.org>. CAVEATS
Setting hardware flow control is not currently supported. It is not yet known how to ask the hardware to send a break. Arkmicro Technologies do not reply to requests of documentation for their products. BSD
November 15, 2006 BSD