gumstix

On 1/30/07, Nate Lowrie <solodex2151@...> wrote:
[...]
> Additionally, can I sample the A/D channels on 1+ Robostix card(s)
> connecting this way at 100Hz?

Robostix itself is capable of doing 15000 samples per second
on its ADC - but then you need to process that much or pass it to
Gumstix or a ground station - throughput would obviously vary.

On 1/31/07, Andrei Rylin <port777@...> wrote:
> On 1/30/07, Nate Lowrie <solodex2151@...> wrote:
> [...]
> > Additionally, can I sample the A/D channels on 1+ Robostix card(s)
> > connecting this way at 100Hz?
>
> Robostix itself is capable of doing 15000 samples per second
> on its ADC - but then you need to process that much or pass it to
> Gumstix or a ground station - throughput would obviously vary.
>

So it would be better if I programmed the Robostix to store to a
buffer and then periodically send it a command over the serial port to
download the buffer to the gumstix?  How much data can I store on the
Robostix?  Eventually the end result is to store the data in an SQLite
database for further indexing and manipulation later.

Thanks for the help.

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Pin 37 is labelled NRESET.  The Breakout-GS doesn't seem to bring this
out.  How does it work?  Is it an input to the gumstix to reset it, or
an output to provide a reset to other boards?  If it's an input, which
way do you pull it to reset the gumstix?

Gary Klarner wrote:
>
>   I am looking at building a netCF equivalent replacement board to 
> hold a Gumstix connex motherboard.
>
>   The NLDEV pin on the LAN91C111 schematic and on the board itself are 
> grounded, but the datasheet for the device says it is a push/pull output.
>
>   All three of the other gumstix ethernet boards connect NLDEV pin to 
> pin 13 of the 92 pin connector as NIOIS16.  The netCF board grounds 
> both the NLDEV pin and pin 13 of the connector.
>
>   This doesn't make sense to me and want to know if anyone has an 
> explanation for this.
>
> Gary
>

IIRC totem-pole outputs are the ones which when logic level is 1 are 
(somewhat) close tied to +vcc, and when 0 to ground, or vice-versa if 
it's an inverted port.

If I read the datasheet correctly, this pin is supposed to be tied to 
+vcc most of the time and do short bursts of grounding. If that's the 
case, leaving it grounded will transform electricity into heat, and 
(less probably) burn the piece.

I don't think this pin alone would do that, but probably if we have a 
few of them on that configuration, perhaps that would explain the fact 
that the Net* boards gets quite hot even when idle.

If that's correct, you should leave that pin unconnected (unless you 
have a use to it), but I'm not an expert, I maybe misreading the 
datasheet or doing worst than that.

- Alexandre

[cut]
> If I read the datasheet correctly, this pin is supposed to be tied to 
> +vcc most of the time and do short bursts of grounding. If that's the 
> case, leaving it grounded will transform electricity into heat, and 
> (less probably) burn the piece.
>   


It should read: (...) "this pin is supposed to be *internally* tied to 
+vcc" (...), or even "internally tied to some sort of +v power source" ...

- Alexandre

Hi guys,

> I tried using an sd card once and had no luck getting it to work on the
> gumstix - worked fine elsewhere. Like you, I'm finding it ever more
> difficult to find mmc cards. I read this as writing on the wall. Unless
> an sd driver comes through for gumstix there may soon not be a choice
> to make.

I think SD card support came along with the 2.6.15 kernel back in revision 865.

I tried a couple SD cards and they worked fine under linux (on my
gumstix), but u-boot doesn't recognize them (it only works with MMC).

Here's one place you can still buy MMC cards:
<http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=1874122&CatId=1938>
<http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=2699864&CatId=1938>

(Note: I haven't used either one of these cards)

-- 
Dave Hylands
Vancouver, BC, Canada
http://www.DaveHylands.com/

Quoting Dave Hylands <dhylands@...>:

> > I tried using an sd card once and had no luck getting it to work on the
> > gumstix - worked fine elsewhere. Like you, I'm finding it ever more
> > difficult to find mmc cards. I read this as writing on the wall. Unless
> > an sd driver comes through for gumstix there may soon not be a choice
> > to make.
>
> I think SD card support came along with the 2.6.15 kernel back in revision
> 865.
>
> I tried a couple SD cards and they worked fine under linux (on my
> gumstix), but u-boot doesn't recognize them (it only works with MMC).

I have a PNY brand SD card, 512 M, which works fine w/ Win XP
but a Waysmall running r1161 software doesn't seem to recognize it --
mmcinit at the U-boot GUM> prompt says only "No MMC card found",
and I wasn't able to get it to work at the Linux prompt;
mount /mnt/mmc fails, and I wasn't able to modprobe my way
to success either. (Just how is it supposed to work at the Linux
prompt if mount /mnt/mmc doesn't automatically work?)

I saw some gumstix-users messages from a 2004 in which someone
stated that SD cards won't work. I guess I'm confirming that.
I hope I'm mistaken; maybe someone more experienced can comment.

HTH
Robert Dodier

I bought my 1GB MMC from Kingston....has been working just fine for
re-flashing kernels, storing .hex files, and backing up /etc. I've
also use some PQI CF cards (2GB) but I couldn't tell which is
faster...


On 1/30/07, Dave Hylands <dhylands@...> wrote:
> Hi guys,
>
> > I tried using an sd card once and had no luck getting it to work on the
> > gumstix - worked fine elsewhere. Like you, I'm finding it ever more
> > difficult to find mmc cards. I read this as writing on the wall. Unless
> > an sd driver comes through for gumstix there may soon not be a choice
> > to make.
>
> I think SD card support came along with the 2.6.15 kernel back in revision 865.
>
> I tried a couple SD cards and they worked fine under linux (on my
> gumstix), but u-boot doesn't recognize them (it only works with MMC).
>
> Here's one place you can still buy MMC cards:
> <http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=1874122&CatId=1938>
> <http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=2699864&CatId=1938>
>
> (Note: I haven't used either one of these cards)
>
> --
> Dave Hylands
> Vancouver, BC, Canada
> http://www.DaveHylands.com/
>
> -------------------------------------------------------------------------
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-- 
:wq

The fact that uboot doesn't recognize SD should not be a problem -
you can load kernel and ramfs image off built-in flash
and then remount root on a partition in SD.
Just like when booting off MMC.

On 1/30/07, robert@... <robert@...> wrote:
> I have a PNY brand SD card, 512 M, which works fine w/ Win XP
> but a Waysmall running r1161 software doesn't seem to recognize it --
> mmcinit at the U-boot GUM> prompt says only "No MMC card found",
> and I wasn't able to get it to work at the Linux prompt;
> mount /mnt/mmc fails, and I wasn't able to modprobe my way
> to success either. (Just how is it supposed to work at the Linux
> prompt if mount /mnt/mmc doesn't automatically work?)

When you try to mount /mnt/mmc, 'mount' looks in /etc/fstab
for a device to mount /mnt/mmc on - name of the SD device is probably different
then MMC.

> I saw some gumstix-users messages from a 2004 in which someone
> stated that SD cards won't work. I guess I'm confirming that.
> I hope I'm mistaken; maybe someone more experienced can comment.

> HTH
> Robert Dodier

I'll see if I can make SD and SDHC work with Gumstix, they definitely
work on my desktop
Linux, the difference is that on the desktop it's connected via USB
while Gumstix
has some dedicated bus - supposed to be simpler than USB.

You can find mmc cards of any size on amazon.com
http://www.amazon.com/s/ref=nb_ss_gw/105-1256090-7517244?url=search-alias%3Daps&field-keywords=mmc&Go.x=0&Go.y=0&Go=Go

> Also, I know that there are no SD drivers, but if I went with MMC
> could I buy an SD card and use it as an MMC card? Nobody really
> sells MMC anymore, everything is SD (other than from gumstix).

Dave Hylands wrote:
> Hi guys,
>
>   
>> I tried using an sd card once and had no luck getting it to work on the
>> gumstix - worked fine elsewhere. Like you, I'm finding it ever more
>> difficult to find mmc cards. I read this as writing on the wall. Unless
>> an sd driver comes through for gumstix there may soon not be a choice
>> to make.
>>     
>
> I think SD card support came along with the 2.6.15 kernel back in revision 865.
>
> I tried a couple SD cards and they worked fine under linux (on my
> gumstix), but u-boot doesn't recognize them (it only works with MMC).
>   

IIRC, SD cards needs a little handshaking before working in MMC mode. 
u-boot's mmc code probably lacks that handshaking, the kernel is 
supposed to do it just fine for quite a while, but maybe there's 
something else to consider (taking the considerable amount of people who 
reported failure to use sd cards with gumstix).



It would be interesting to have a wiki page with a table like:

[ Brand ] [ Model ] [ Size ] [ Gumstix's Build & kernel version ] [ 
Status ] [ Reporter ]

... Where status is either OK or a description of the symptoms.
... I would create one if I knew how to use the wiki (shame on me).

- Alexandre

SD definitely works with the latest buildroot - but didn't work with
the stock kernel my gumstix shipped with.

-marc

On 1/30/07, Alexandre Pereira Nunes <alex@...> wrote:
> Dave Hylands wrote:
> > Hi guys,
> >
> >
> >> I tried using an sd card once and had no luck getting it to work on the
> >> gumstix - worked fine elsewhere. Like you, I'm finding it ever more
> >> difficult to find mmc cards. I read this as writing on the wall. Unless
> >> an sd driver comes through for gumstix there may soon not be a choice
> >> to make.
> >>
> >
> > I think SD card support came along with the 2.6.15 kernel back in revision
> 865.
> >
> > I tried a couple SD cards and they worked fine under linux (on my
> > gumstix), but u-boot doesn't recognize them (it only works with MMC).
> >
>
> IIRC, SD cards needs a little handshaking before working in MMC mode.
> u-boot's mmc code probably lacks that handshaking, the kernel is
> supposed to do it just fine for quite a while, but maybe there's
> something else to consider (taking the considerable amount of people who
> reported failure to use sd cards with gumstix).
>
>
>
> It would be interesting to have a wiki page with a table like:
>
> [ Brand ] [ Model ] [ Size ] [ Gumstix's Build & kernel version ] [
> Status ] [ Reporter ]
>
> ... Where status is either OK or a description of the symptoms.
> ... I would create one if I knew how to use the wiki (shame on me).
>
> - Alexandre
>
>
>
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>

Hi Jeremy,

> # modprobe i2c-dev
> # modprobe i2c-pxa
>
>    As I understand it, modprobe is supposed to output something to let
> you know the i2c is working... Well, it didn't. I tried rebooting and
> modprobing again, but no dice. Any thoughts?

modprobe itself doesn't output anything. The driver that's loaded
often prints something to the console, so if you happen to be typing
your commands on the console you'd see that output, otherwise you'd
need to do something like:

tail /var/log/messages

after doing the modprobe.

lsmod will show you if the modules are loaded. I know for sure that
i2c-pxa outputs something. I don't recall if i2c-dev does or not.

-- 
Dave Hylands
Vancouver, BC, Canada
http://www.DaveHylands.com/

Dave -

I normally do the following:

X Install buildroot
X Install uisp & robostix_drv.ko
X Program Flash-LED.hex and make sure it works
X Install i2c modules
X Install i2c-load
X Install i2c-io
X Program i2c-Bootloader onto robostix
X Make sure i2c-load can talk to bootloader
X Use i2c-load to download i2c-io
- Test i2c-io by toggling an LED.

    So, directly after installing everything, I tested the led and it 
worked! Good news. For reference I used:
i2c-io 0x0b setdir g.3 out
i2c-io 0x0b set g.3 0

However, after restarting the gumstix, I tried the same thing, and it 
didn't work. I found that by running the following srting of commands, I 
could get it to work again:

cd /
cd rs
export LD_LIBRARY_PATH=/tmp/lib
export PATH=$PATH:/tmp/rs
mknod /dev/robostix c 240 0
insmod robostix_drv.ko
cd /
cd lib/modules/2.6.18gum
cp modules.symbols modules.symbols.org
cp modules.dep modules.dep.org
cat mod.sym >> modules.symbols
cat mod.dep >> modules.dep
modprobe i2c-dev
modprobe i2c-pxa
uisp --wr_fuse_l=0xbf --wr_fuse_h=0xc2 --wr_fuse_e=0xff
i2c-io 0x0b setdir g.3 out
i2c-io 0x0b set g.3 0

    I'm not sure if all of it was necessary, but it did work. Is there a 
way to take the necessary parts of the above and make them happen 
automatically when I log in, such that I can immediately begin using i2c-io?

Thanks,
Jeremy

Alex Haack <haackbus <at> gmail.com> writes:

> 
> I have followed the site(docwiki.gumstix.org/NFS) that tells you how to add
NFS support into the gumstix, but when I do that and try to recompile the entire
buildroot it gives me errors and doesn't finish.  I have tried using revision
1229 and 1232 and both don't work.  The error talks about umount getting
declared twice, once static and one not static.  Is there another way to mount
an NFS, like manually or something  like that.  I have also tried just to
compile the 775 revision that it talks about on the wiki and it wont even
compile initially without trying to add NFS support.  
> Also would samba work better or anything that lets me see other computer
drives and lets me use those file on it as another drive to use.  The whole
point of mounting a network share is so I can stream music files from it to the
gumstix.
> 
>
> 

Alex,
It took a lot of searching to find all the parts needed to get NFS working, some
in the wiki and others in archived posts.

changes for NFS:
        gumstix-buildroot/target/device/Gumstix/basix-connex/busybox.config
                CONFIG_FEATURE_MOUNT_NFS=y
        gumstix-buildroot/target/device/Gumstix/basix-connex/linux.config
                CONFIG_NFS_FS=y
                CONFIG_NFSD=Y
        gumstix-buildroot/target/device/Gumstix/basix-connex/uClibc.config
                UCLIBC_HAS_RPC=y

Unfortunately, I lost my bluetooth on the 1231 build.  Seems to be a gcc version
conflict with the build trees.  Aggghhhh.

Rick

I tried with the spec specifed and it had errors.  It looks like the errors
are on gcc (segmentation fault), im using gcc version 4.0.3.  Do I maybe
need to use an older version to get the NFS support compiling (just a
thought).


On 1/30/07, Rick <rick@...> wrote:
>
> Alex Haack <haackbus <at> gmail.com> writes:
>
> >
> > I have followed the site(docwiki.gumstix.org/NFS) that tells you how to
> add
> NFS support into the gumstix, but when I do that and try to recompile the
> entire
> buildroot it gives me errors and doesn't finish.  I have tried using
> revision
> 1229 and 1232 and both don't work.  The error talks about umount getting
> declared twice, once static and one not static.  Is there another way to
> mount
> an NFS, like manually or something  like that.  I have also tried just to
> compile the 775 revision that it talks about on the wiki and it wont even
> compile initially without trying to add NFS support.
> > Also would samba work better or anything that lets me see other computer
> drives and lets me use those file on it as another drive to use.  The
> whole
> point of mounting a network share is so I can stream music files from it
> to the
> gumstix.
> >
> >
> >
>
> Alex,
> It took a lot of searching to find all the parts needed to get NFS
> working, some
> in the wiki and others in archived posts.
>
> changes for NFS:
>
>         gumstix-buildroot/target/device/Gumstix/basix-connex/busybox.config
>                 CONFIG_FEATURE_MOUNT_NFS=y
>         gumstix-buildroot/target/device/Gumstix/basix-connex/linux.config
>                 CONFIG_NFS_FS=y
>                 CONFIG_NFSD=Y
>         gumstix-buildroot/target/device/Gumstix/basix-connex/uClibc.config
>                 UCLIBC_HAS_RPC=y
>
> Unfortunately, I lost my bluetooth on the 1231 build.  Seems to be a gcc
> version
> conflict with the build trees.  Aggghhhh.
>
> Rick
>
>
>
>
>
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