Re: [ts-7000] Re: Ts-7500: Running without 752, but I need a serial (not ssh/telnet)console

[Alex McLain <>]

Hi Dan,

Correct, I am running the project without a 752 baseboard.  The serial console is connected and working WITH a 750 ohm pulldown resistor on the TX pin so it boots from the SD card.  I wonder why support said it wouldn't work; I copied the circuit right from their 752 schematic.

http://www.embeddedarm.com/documentation/ts-752-schematic.pdf 

When looking at the 752 header, remember that the first four TS-7500 pins hang off the side, so pin 7 on the 7500 is pin 3 on the 752.

-Alex

On Fri, May 4, 2012 at 7:00 AM, daniel.desrude <> wrote:

 

Alex,

Thanks for the response.

Without the 752 baseboard I thought I could do that also but in talking to support they said if you want to load the kernel and initrd from the SD card you would need to put a pulldown on the MODE 1 pin.

By putting the pulldown on mode 1 (pin 7) I am making the Console TX pin 7 unusable.

DIO_07 Console TX / Mode1
DIO_08 Console RX

I am hoping they are wrong and I don't have to use up a UART so please let me know if you figured out a way. You are running without a 752 baseboard correct?

Thanks Again,
Dan

--- In ts-7000%40yahoogroups.com, Alex McLain <> wrote:
>
> Hi Dan,
>
> Why not use the TS-7500's console pins? If you look at the schematic, TXD
> is on 7 and RXD is on 8. That way you don't have to chew up another UART.
> I recently used this in a project with an FTDI cable and it works great.
> The drivers are pre-installed on most operating systems so it works out of
> the box.
>
> TS-7500 Schematic
> http://www.embeddedarm.com/documentation/ts-7500-schematic.pdf
>
> FTDI TTL-232R-3V3
> http://search.digikey.com/us/en/products/TTL-232R-3V3/768-1015-ND/1836393
>
> -Alex
>
>

> On Thu, May 3, 2012 at 9:30 AM, dannyd5000 <> wrote:
>
> > **

> >
> >
> >
> >
> > I have been able to figure it out.
> >
> > 1.) Nothing specific to the ts-7500 needs to be done other than modifying
> > /etc/rc.local to point a newly created directory in /dev Below is my
> > /etc/rc.local file. As you can see i commented out the code having to do
> > with the console, probably didn't need to do that but I don't need it.
> > /dev/ttyxuart5 is for the TTL 5 PORT I am using for console.
> >
> > PATH=/usr/local/bin:/usr/bin:/bin
> > eval $(xuartctl --server --port 1 --speed 115200 2>&1); ln -s $ttyname
> > /dev/ttyxuart1
> > eval $(xuartctl --server --port 2 --speed 115200 2>&1); ln -s $ttyname
> > /dev/ttyxuart2
> > eval $(xuartctl --server --port 4 --speed 38400 2>&1); ln -s $ttyname
> > /dev/ttyxuart4
> > eval $(xuartctl --server --port 5 --speed 115200 2>&1); ln -s $ttyname
> > /dev/ttyxuart5
> > #cp -P /initrd/dev/tsconsole /dev
> > exit 0
> >
> > The next steps i found out after reading up on getty.
> >
> > 2.)
> > Next I commented out one line in the /etc/inittab and added another as
> > shown below. Also probably don't need the -n.
> >
> > #T0:23:respawn:/sbin/getty -L tsconsole 115200 vt100
> > T0:23:respawn:/sbin/getty -n -L ttyxuart5 115200 vt100
> >
> > 3)
> > next you need to add the newly created ttyxuart5 terminal to the
> > /etc/securetty file. This is needed so when your console is considered a
> > trusted terminal for loging in as root.
> >
> > 4)
> > After you boot up again and run the command ps -ef you should see the new
> > process.
> > /sbin/getty -L ttyxuart5 115200 vt100
> >
> > Now with at 3.3V ttl rs232 converter hooked up to TTL5 you will see the
> > console output.
> >
> > Hope this is useful to someone out there. If so give me a shout out. It's
> > good to know posts like this are helpful.
> >
> > One other thing for those looking for a off the shelf 3.3V TTL Rs232
> > converter i have been using this with not problems.
> > http://www.superdroidrobots.com/shop/item.aspx?itemid=337
> >
> > I'm sure there is cheaper solutions out there that require soldering but
> > if you want to get up and running quickly its a good purchase.
> >

> > --- In ts-7000%40yahoogroups.com, "dannyd5000" <dannyd4000@> wrote:
> > >
> > > Hello All,
> > >
> > > I am using 4 TTL lines (with rs232 converter) on TS-7500 to communicate
> > with 4 devices with great success. However my application requires me to
> > have a serial console for debugging purposes. If I am Unable to connect via
> > a network connection(ssh, telnet, etc), i need a way to login to the board.
> > So I need the console to be output a 5th ttl line which i would convert to
> > rs232.
> > >
> > > The problem I have is figuring out how to map the console to that 5th
> > TTL. I know if I am on the TS-752 baseboard I can just use its RS232
> > connection to see the console, but I will not have the TS-752. Has anyone
> > had to do this? Any ideas?
> > >
> > > Thanks in advance,
> > > Dan
> > >
> >
> >
> >
>

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