Ethernet Polling vs Broadcasting on an Embedded device
I have asked to design a test system for an Ethernet enabled weather
station. At this point, these weather stations are nothing but 2 PCs
running Linux on it and they constantly read weather related
through some sensors. Eventually they will be replaced with a miniature
embedded Linux device (yet to be designed!).
I have worked extensively with 1/2 duplex RS485 networks where we poll
device and then send an acknowledgment to the device. I am not too sure
what is the best way to handle an Ethernet enabled devices. The
engineers have agreed to change the Firm...Ethernet Device
I'm considering what kind of project I'd like to do for my next year
in college. I have an idea for creating a network host device that will
work on an Ethernet LAN. Obviously, my device would need some sort of
Network Interface Card in it.
Thinking about it for about 10 seconds tho, I realised that it might
be a *very* complicated job to create a Network Interface Card,
considering things like having to implement Carrier Sense Multi-
Access/Collission Detection. Not that I'm one to shy away from a big job,
but I plan on having this project done within a year :-P
...Ethernet I/O device
I hadn't noticed this before.
It's a bit pricey but might come in handy for the solder-challenged.
...Ethernet echo device
I'm an administrator of rather distributed network and I would like
to have opportunity to ping last-to-client device to see if the link is
up and the fault is at client's computer or cable.
I would like to ask, if there's something like 'ethernet echo dongle'
- a small device to be plugged into Eth equipment (hub, switch,
whatever) and being able to be pinged from network.
I know I may plug for example a dummy D-link router (~100$ at my
place) but perhaps there's something smaller and cheaper.
Pawel Kraszewsk...Poll on device fd
Can we do poll on device fd returned by CreateFile function call?
If yes, which is callback method in device driver(on win 2k) for poll ?
select() in Windows is for sockets only.
Maxim Shatskih, Windows DDK MVP
"Tejas" <email@example.com> wrote in message
> Hi All,
> Can we do poll on device fd returned by CreateFile function call?
> If yes, which is callback method in device ...[poll] what kind of devices do you own?
From the «plus one typewriter and two dictaphones» department:
Title: Poll: You Mainly Use Desktops & Laptops
Author: Christine Hall
Date: Thu, 27 Mar 2014 13:44:05 -0400
[image 1]It’s hard to remember that it wasn’t that long ago that we only had
a couple of choices to meet our computing needs. As recently as 2007, the
year before Obama was elected, someone looking for a new computer basically
could choose betw...Adding ethernet device driver
I added Realteck 81x59 ethernet card to my pc. And also i added the
driver. The problem is while iam doing communication betn linux and
vxworks system using udp protocal i can,t send or receive messages. It
is giving as HOST UNREACHble. These two systems are directly
connected using ethernet cable.
How to check in the target shell whether the driver is added properly
added are or not?
Thanks in advance
Can you ping the vxworks system? Does any communication between the systems
work, or is just UDP behaving badly?
What type of cable is connected between the two systems? ...How do I communicate with 3 Ethernet devices
I am new to using ethernet and I need help writting a LabVIEW vi to communicate with 3 Omega devices. I need to open a connection to all 3 at the same time and read data from each. I am able to communicate with them individually using the TCP/IP vis (see attached vi) but I don't know how to communicate with all 3 at the same time.
Can anyone help?
Hello BertYou can simply replicate your code (copy and paste) so as to open multiple TCP/IP sessions to all three instruments as the same tim...How to poll multiple devices in kernel ?
I'm a beginner in driver and module programming, and I need some help:
I designed a driver that need to listen at multiple devices (network
device, serial device, USB device) for incoming data.
Once received, that data should be accessible to user space through
the "read" function.
That's why I cannot use the poll/select functions from user space.
My first idea is to make a kernel thread for EACH device that do a
blocking read. When data comes, read returns and fills a global buffer
(protected with mutexes). Do you think it is a good idea?