This seems to have disapeared into the void, perhap due to the recent
breaking. If you've seen this before go ahead and ignore it:
--
Theo ten Brummelaar
The CHARA Array-Georgia State University-Mount Wilson Observatory
http://www.chara.gsu.edu/~theo Ph: 626-796-5405 Fx: 626-796-6717
Gentle Persons,
I am using RT-Linux for control of six telescopes, and need to have one
RT process talk down various serial lines to each telescope control
computer. I use a Cyclades multi-serial-port board. I started by having
the RT process send stuff to a FIFO and then had a Linux program
re-route these commands to the various serial ports.
The measured lag was about 3mS at best and several tens of mS at worst,
and it varied depending on the current CPU load. I also have a two
serial port version running using rt_com, which has a consistent lag of
2mS (twice the period of the RT task, which is fine).
Ideally I would like an RT driver for the Cyclades board, but that is no
small amount of work. Is it possible to somehow put characters into the
buffer of a character device from RT-linux? This way they can be
processed by the already existing driver on the Linux side. What
function call can I use to do this, if at all?
Thanks in advance,
Theo
Theo ten Brummelaar
The CHARA Array-Georgia State University-Mount Wilson Observatory
http://www.chara.gsu.edu/~theo Ph: 626-796-5405 Fx: 626-796-6717
