Re: [ts-7000] Re: 7390 serial

[al l <>]

Dear all,

I'm trying to connect a PC shell serial emulator (putty) to the COM2 connector of the TS 7880 board and I don't success. I have checked all the configuration parameters and the mailing list mesages, tried all I have thought and it is like COM2 doesn't exist!!! I copy some chekings I have done:

ls -l /dev

-rw-r--r-- 1 root root         5 Sep  1 02:26 ttAM1
-rw-r--r-- 1 root root         5 Sep  1 02:26 ttAm1
crw-rw-rw- 1 root tty     5,   0 Feb 18  2009 tty
crw------- 1 root tty     4,   0 Aug 31 03:43 tty0
crw------- 1 root root    4,   1 Sep  1 01:07 tty1
crw------- 1 root root    4,   2 Sep  1 01:07 tty2
crw------- 1 root root    4,   3 Sep  1 01:07 tty3
crw------- 1 root root    4,   4 Sep  1 01:07 tty4
crw------- 1 root root    4,   5 Sep  1 01:07 tty5
crw------- 1 root root    4,   6 Sep  1 01:07 tty6
crw------- 1 root tty     4,   7 Feb 18  2009 tty7
crw------- 1 root tty     4,   8 Sep  1 02:58 tty8
crw------- 1 root tty     4,   9 Feb 18  2009 tty9
crwxr-xr-x 1 root root  204,  16 Mar 16  2006 ttyAM0
-rw-r--r-- 1 root root         5 Sep  1 02:35 ttyAM1
-rw-r--r-- 1 root root         5 Sep  1 02:35 ttyAS1
crw------- 1 root tty     4,  64 Sep  1 03:17 ttyS0
-rwxrwxrwx 1 root root        34 Sep  1 02:58 ttyS1

So it seems ttyS1 ie COM2 exists....

ps aux

root       715  0.0  0.9   2948  1208 ttyS0    Ss   03:08   0:00 /bin/login --
root       716  0.0  1.2   2956  1544 ttyS0    S    03:08   0:00 -bash
www-data   720  0.0  1.6  14228  2064 ?        S    03:08   0:00 /usr/sbin/apach
www-data   721  0.0  1.9 235648  2528 ?        Sl   03:08   0:00 /usr/sbin/apach
www-data   723  0.0  1.9 235648  2536 ?        Sl   03:08   0:00 /usr/sbin/apach
root       786  0.0  0.7   2476   936 ttyS0    R+   03:19   0:00 ps aux

So it seems that console is in ttyS0 ie COM1

nano /etc/inittab

#1:2345:respawn:/sbin/getty 38400 tty1
#2:23:respawn:/sbin/getty 38400 tty2
#3:23:respawn:/sbin/getty 38400 tty3
#4:23:respawn:/sbin/getty 38400 tty4
#5:23:respawn:/sbin/getty 38400 tty5
#6:23:respawn:/sbin/getty 38400 tty6

T0:23:respawn:/sbin/getty -L ttyS0 115200 vt100
#T1:23:respawn:/sbin/getty -L ttyS1 115200 vt100

So it seems that console is in ttyS0 and ttyS1 is free!!

If I do: ts7800:~# echo hola > /dev/ttyS0 It prints hola in ttyS0 (just where I am ie my shell serial emulator) so it seems that ttyS0 is console.

If I do:

ts7800:~# echo hola > /dev/ttyS1
ts7800:~# echo hola > /dev/ttyAM1
ts7800:~# echo hola > /dev/ttyAS1

nothing!!!!

ts7800:~# echo hola > /dev/ttyAM0  
-bash: /dev/ttyAM0: No such device or address  It doesn't exist...

As you can see it is like COM2 doesn't exist!!!!

I have checked serial bus cable and it is ok.... (red line just on the board dot) I am using TS manufactured cable.... so....

I am lost..... I have no more ideas....

Would you be so gratefull to help me with this???

thanks!!

---

De: Adriano Naspolini <>
Para:
Enviado: miércoles, 5 de agosto, 2009 15:44:26
Asunto: [ts-7000] Re: 7390 serial

 

Donal,
I'm not using SD, but internal flash. I made some tests here and noticed that flash is faster than the SD, and more reliable.

Ts support said maybe it can be a problem related to processor usage, because uart buffer has only 5 bytes, so, it overflows during hi-processing tasks. The suggestion is making the thread less 'nice'.

It seems the problem is solved. I'll make more tests, but for this moment it's enough.

Regards

Adriano

--- In ts-7000%40yahoogroups.com, "Donal O'Connor" <donaloconnor@ ...> wrote:
>
> Actually there's a discussion on it a while back.
>
> On Tue, Aug 4, 2009 at 11:24 PM, Donal O'Connor <donaloconnor@ ...>wrote:
>
> > This is very interesting. I had the exact same problem a while back using
> > Qextserialport.
> >
> > Are you working off the SD card, as I found that, once that locked up, to
> > 100% CPU usage, it was if the world stopped.
> >
> >
> > On Tue, Aug 4, 2009 at 11:11 PM, Adriano Naspolini <anaspolini@ ...>wrote:
> >
> >>
> >>
> >> Hi,
> >>
> >> I have a strange problem using 7390 serial ttts5. Sometimes it looses some
> >> chars.
> >>
> >> The problem usually happens when the processor is working over 95%, and
> >> memory is over 85MB (90 available), so I think the problem is related to it.
> >>
> >> My program has 2 threads (first for gui and second to execute the
> >> "underground" work).
> >> This underground thread sends and reads information to and from serial
> >> ports.
> >> I use ttts5 connected to a PID controller and ttyAM0 connected to a GPS.
> >> With this configuration, I can't receive correct status messages from
> >> controller (but can send). If i change the ports (ttts5 to GPS), GPS
> >> messages don't arrive fine (I don't send messages to GPS).
> >>
> >> This port swap makes me think the problem isn't related to my program
> >> (same port, different codes).
> >> I have tried my own serial lib, seriallib-0. 6 from sourceforge and
> >> QextSerialPort from Qt.
> >>
> >> Any Ideas?
> >>
> >> Adriano
> >>
> >>
> >>
> >
> >
>

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