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Full Discussion: RS232 programming problem
Top Forums UNIX for Advanced & Expert Users RS232 programming problem Post 302246876 by dudi.forum on Tuesday 14th of October 2008 03:36:14 PM
Old 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.


Smilie
 

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GAMMU-DETECT(1) 						       Gammu							   GAMMU-DETECT(1)

NAME
gammu-detect - Gammu device detection New in version 1.28.95. SYNOPSIS
gammu-detect [OPTIONS] DESCRIPTION
Script to detect available devices, which might be suitable for gammu. Note This program lists all devices, which might be suitable, it does not do any probing on devices them self. Currently it supports following devices: o USB devices using udev o Serial ports using udev o Serial ports on Windows o Bluetooth devices using Bluez Note Supported devices depend on platform you are using and compiled in features. You can find out what is actually compiled in by run- ning gammu-detect -v. This program follows the usual GNU command line syntax, with long options starting with two dashes (--). A summary of options is included below. -h, --help Show summary of options. -d, --debug Show debugging output for detecting devices. -v, --version Show version information and compiled in features. -u, --no-udev Disables scanning of udev. -b, --no-bluez Disables scanning using Bluez. -w, --no-win32-serial Disables scanning of Windows serial ports. OUTPUT
The output of gammu-detect is configuration file for Gammu (see gammurc) with configuration section for every device which might be used with gammu. Note You can choose which section to use in gammu by gammu -s. When invoked as gammu-detect -d, also all examined devices are listed as comments in the output. EXAMPLE
; Configuration file generated by gammu-detect. ; Please check The Gammu Manual for more information. [gammu] device = /dev/ttyACM0 name = Nokia E52 connection = at [gammu1] device = /dev/ttyACM1 name = Nokia E52 connection = at [gammu2] device = /dev/ttyS0 name = Phone on serial port 0 connection = at [gammu3] device = /dev/ttyS1 name = Phone on serial port 1 connection = at [gammu4] device = /dev/ttyS2 name = Phone on serial port 2 connection = at [gammu5] device = /dev/ttyS3 name = Phone on serial port 3 connection = at [gammu6] device = 5C:57:C8:BB:BB:BB name = Nokia E52 connection = bluephonet AUTHOR
Michal iha <michal@cihar.com> COPYRIGHT
2009-2012, Michal iha <michal@cihar.com> 1.31.90 February 24, 2012 GAMMU-DETECT(1)
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