[Gumstix-users] serial port trouble

[Nate W <del...@gm...>]

Here's my configuration:

gumstix mounted on robostix
removed the getty for ttyS0 from /etc/inittab
stty -F /dev/9600 ispeed 9600 ospeed 9600 raw
stty -F /dev/ttyS0 cs8 -parenb -cstopb -ixon -ixoff
I have bluetooth PAN set up, and I log in to the gumstix via ssh
the robostix ttyS0 header goes to a level shifter and a USB-serial interfac=
e
I have teraterm running on my windows box, 9600 8N1, no flow control

Good news: if I run the getty manually, I can log in and use the
gumstix over the serial line

More good news: if i run sertest -p /dev/ttyS0 -d -v I can type in my
ssh window or terminal window and watch characters going in both
directions

Bad news: if I run "echo abcdef > /dev/ttyS0" only the "abc" appears
in the terminal window.  Even if I do this right after running sertest
to (theoretically) configure the serial port.

I've tried this all with /dev/ttyS2 as well, with almost the same
results: sertest works, but when I use echo, only the first 2.5
characters come through:  ab=E3.  I tried the gpio adjustments shown on
the tips-and-tricks wiki page for ttys2, but no luck.  I also have a
small C program that writes stuff to the serial port, and again only
the first 3 bytes come out the other end.

If I could just squeeze FIVE bytes through with each write to the
serial port, I'd be happy.  :-)   But I'm stuck at 3 bytes max
(occasionally 4), and I'm totally stumped.  Anyone have suggestions?

Thanks,

Nate Waddoups
Redmond WA USA
http://www.natew.com/   <=3D=3D for nerds
http://www.featherforum.com/   <=3D=3D for birds