From: Sean W. <mod...@ho...> - 2006-07-25 22:02:15
|
Hey, guys. It seems that I do in fact have 4MB of flash on my card (it's a basix 400-bt). When I built buildroot with c++ enabled, my root_fs_arm_nofpu is 3,447,424 bytes and the uboot.bin is only 145,836 bytes for a grand total of 3,593,260 leaving just over 400k free. If I'm not mistaken, by looking in /gumstix-buildroot/build_arm_nofpu/root I should find all the files/folders I am to expect to appear on the gumstix once I load it with uboot, correct? Well, if this is true then this should mean that I'm good on space. Hurray. My problem is going to be actually loading this image. I've still not managed to hunt down the serial connection problem I was having a couple of weeks ago despite all the help I received. Whether using hyperteminal on a windows machine or ckermit on linux, it still acts like I'm not even connected. The only way I can communicate with the gumstix is over bluetooth, but, as I understand, I need to be able to connect over serial cable to utilize uboot. I was able to determine that the problem does not rest with the host computer or the cable however I was getting inconsistent results when probing the tweener serial port for idle voltages. Sometimes I'd have a strong voltage... other times I'd have around 0. I even switched tweeners out, but wasn't getting anything there either. I wonder now if it's not a problem with the hi-rose connector pins. At a glance, nothing seems broken/bent out of whack. Any thoughts? Thanks. -Sean |
From: Ryan R. <rjr...@uc...> - 2006-07-26 00:06:51
|
1st point- u-boot and root exist on separate partitions of flash. I don't know how it's allocated but if you're unlucky it won't fit. As for the serial ports, you could write up a little program to continuously write 0xFFs to the port, and using the schematics find the FFUART TxD pin (on the hirose) and see if it's held at 3.3v (logic 1). An o-scope would be nice here, but not required. If that fails I know that there was a discussion a while back (few weeks, maybe less) about reflashing the root filesystem over ssh. It seems to me that the same procedure could be done with bluetooth since all that's required is console access. The serial thing is flatly weird, and I can't figure what's up except that maybe there's a bad trace somewhere, though that would be likely to only affect one data direction. Ryan Sean Wheeler wrote: >Hey, guys. It seems that I do in fact have 4MB of flash on my card (it's a >basix 400-bt). When I built buildroot with c++ enabled, my >root_fs_arm_nofpu is 3,447,424 bytes and the uboot.bin is only 145,836 bytes >for a grand total of 3,593,260 leaving just over 400k free. If I'm not >mistaken, by looking in /gumstix-buildroot/build_arm_nofpu/root I should >find all the files/folders I am to expect to appear on the gumstix once I >load it with uboot, correct? > >Well, if this is true then this should mean that I'm good on space. Hurray. > My problem is going to be actually loading this image. I've still not >managed to hunt down the serial connection problem I was having a couple of >weeks ago despite all the help I received. Whether using hyperteminal on a >windows machine or ckermit on linux, it still acts like I'm not even >connected. The only way I can communicate with the gumstix is over >bluetooth, but, as I understand, I need to be able to connect over serial >cable to utilize uboot. > >I was able to determine that the problem does not rest with the host >computer or the cable however I was getting inconsistent results when >probing the tweener serial port for idle voltages. Sometimes I'd have a >strong voltage... other times I'd have around 0. I even switched tweeners >out, but wasn't getting anything there either. I wonder now if it's not a >problem with the hi-rose connector pins. At a glance, nothing seems >broken/bent out of whack. Any thoughts? Thanks. > >-Sean > > > >------------------------------------------------------------------------- >Take Surveys. Earn Cash. Influence the Future of IT >Join SourceForge.net's Techsay panel and you'll get the chance to share your >opinions on IT & business topics through brief surveys -- and earn cash >http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV >_______________________________________________ >gumstix-users mailing list >gum...@li... >https://lists.sourceforge.net/lists/listinfo/gumstix-users > > > |
From: Sean W. <mod...@ho...> - 2006-07-26 00:29:10
|
Thanks, Ryan. I actually do have an o-scope here on my desk. I'll give it a try tomorrow. Perhaps my findings will be illuminating. -Sean >From: Ryan Rapetti <rjr...@uc...> >Reply-To: "General mailing list for gumstix users." ><gum...@li...> >To: "General mailing list for gumstix users." ><gum...@li...> >Subject: Re: [Gumstix-users] c++ library size/ serial woes remain >Date: Tue, 25 Jul 2006 16:10:06 -0700 > >1st point- u-boot and root exist on separate partitions of flash. I >don't know how it's allocated but if you're unlucky it won't fit. As >for the serial ports, you could write up a little program to >continuously write 0xFFs to the port, and using the schematics find the >FFUART TxD pin (on the hirose) and see if it's held at 3.3v (logic 1). >An o-scope would be nice here, but not required. If that fails I know >that there was a discussion a while back (few weeks, maybe less) about >reflashing the root filesystem over ssh. It seems to me that the same >procedure could be done with bluetooth since all that's required is >console access. The serial thing is flatly weird, and I can't figure >what's up except that maybe there's a bad trace somewhere, though that >would be likely to only affect one data direction. > >Ryan >Sean Wheeler wrote: > > >Hey, guys. It seems that I do in fact have 4MB of flash on my card (it's >a > >basix 400-bt). When I built buildroot with c++ enabled, my > >root_fs_arm_nofpu is 3,447,424 bytes and the uboot.bin is only 145,836 >bytes > >for a grand total of 3,593,260 leaving just over 400k free. If I'm not > >mistaken, by looking in /gumstix-buildroot/build_arm_nofpu/root I should > >find all the files/folders I am to expect to appear on the gumstix once I > >load it with uboot, correct? > > > >Well, if this is true then this should mean that I'm good on space. >Hurray. > > My problem is going to be actually loading this image. I've still not > >managed to hunt down the serial connection problem I was having a couple >of > >weeks ago despite all the help I received. Whether using hyperteminal on >a > >windows machine or ckermit on linux, it still acts like I'm not even > >connected. The only way I can communicate with the gumstix is over > >bluetooth, but, as I understand, I need to be able to connect over serial > >cable to utilize uboot. > > > >I was able to determine that the problem does not rest with the host > >computer or the cable however I was getting inconsistent results when > >probing the tweener serial port for idle voltages. Sometimes I'd have a > >strong voltage... other times I'd have around 0. I even switched >tweeners > >out, but wasn't getting anything there either. I wonder now if it's not >a > >problem with the hi-rose connector pins. At a glance, nothing seems > >broken/bent out of whack. Any thoughts? Thanks. > > > >-Sean > > > > > > > >------------------------------------------------------------------------- > >Take Surveys. Earn Cash. Influence the Future of IT > >Join SourceForge.net's Techsay panel and you'll get the chance to share >your > >opinions on IT & business topics through brief surveys -- and earn cash > >http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV > >_______________________________________________ > >gumstix-users mailing list > >gum...@li... > >https://lists.sourceforge.net/lists/listinfo/gumstix-users > > > > > > > > >------------------------------------------------------------------------- >Take Surveys. Earn Cash. Influence the Future of IT >Join SourceForge.net's Techsay panel and you'll get the chance to share >your >opinions on IT & business topics through brief surveys -- and earn cash >http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV >_______________________________________________ >gumstix-users mailing list >gum...@li... >https://lists.sourceforge.net/lists/listinfo/gumstix-users |
From: Chris D. <cg...@co...> - 2006-07-26 12:45:43
|
On 7/25/06, Ryan Rapetti <rjr...@uc...> wrote: > 1st point- u-boot and root exist on separate partitions of flash. I > don't know how it's allocated but if you're unlucky it won't fit. As > for the serial ports, you could write up a little program to > continuously write 0xFFs to the port, and using the schematics find the > FFUART TxD pin (on the hirose) and see if it's held at 3.3v (logic 1). > An o-scope would be nice here, but not required. If that fails I know > that there was a discussion a while back (few weeks, maybe less) about > reflashing the root filesystem over ssh. It seems to me that the same > procedure could be done with bluetooth since all that's required is > console access. The serial thing is flatly weird, and I can't figure > what's up except that maybe there's a bad trace somewhere, though that > would be likely to only affect one data direction. Actually, the line should be held at logic high when idle. Continuously writing 0xFF to the port will cause one out of every ten bits to be logic low, that one bit being the start bit. Since you have an o-scope, look at the level while idle -- should be logic high. If that checks out, try transmitting some character frames and see what that looks like. -chris |
From: Sean W. <mod...@ho...> - 2006-07-26 17:40:03
|
Ok so I've put my oscope skills to use and found some rather weird stuff on the MiniDin-8 connector on the tweener. I know you guys were talking about the hi-rose connector, but I don't really have probes of the appropriate sizes. Supposedly, pins 3, 4 and 5 are TxD, GND, and RxD respectively. I'm getting the exact same behavior for all three. The voltages rise and fall periodically, but in strange shape. The trace is flat through 0 V for around 2 ms, but then it quickly saturates (above 25 V) before coming back down, flattening out at 0 V and then displaying the same behavior in the negative. The period is roughly 17 ms with peak to peak voltage of 50.8 V. My probe is set to 1x so that's not the problem. If it were 10x then I could understand getting 50, but it's not. The Gumstix is attached, but I'm leaving it well alone. Tell me this is supposed to happen... -Sean >From: "Chris Danis" <cg...@co...> >Reply-To: "General mailing list for gumstix users." ><gum...@li...> >To: "General mailing list for gumstix users." ><gum...@li...> >Subject: Re: [Gumstix-users] c++ library size/ serial woes remain >Date: Wed, 26 Jul 2006 08:39:31 -0400 > >On 7/25/06, Ryan Rapetti <rjr...@uc...> wrote: > > 1st point- u-boot and root exist on separate partitions of flash. I > > don't know how it's allocated but if you're unlucky it won't fit. As > > for the serial ports, you could write up a little program to > > continuously write 0xFFs to the port, and using the schematics find the > > FFUART TxD pin (on the hirose) and see if it's held at 3.3v (logic 1). > > An o-scope would be nice here, but not required. If that fails I know > > that there was a discussion a while back (few weeks, maybe less) about > > reflashing the root filesystem over ssh. It seems to me that the same > > procedure could be done with bluetooth since all that's required is > > console access. The serial thing is flatly weird, and I can't figure > > what's up except that maybe there's a bad trace somewhere, though that > > would be likely to only affect one data direction. > >Actually, the line should be held at logic high when idle. >Continuously writing 0xFF to the port will cause one out of every ten >bits to be logic low, that one bit being the start bit. Since you >have an o-scope, look at the level while idle -- should be logic high. > If that checks out, try transmitting some character frames and see >what that looks like. > >-chris > >------------------------------------------------------------------------- >Take Surveys. Earn Cash. Influence the Future of IT >Join SourceForge.net's Techsay panel and you'll get the chance to share >your >opinions on IT & business topics through brief surveys -- and earn cash >http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV >_______________________________________________ >gumstix-users mailing list >gum...@li... >https://lists.sourceforge.net/lists/listinfo/gumstix-users |
From: Ryan R. <rjr...@uc...> - 2006-07-26 18:09:42
|
Ok, found the ttl level pins. If this doesn't work figure the hirose or the UART are bad. First, orientation. I'm looking at the back of the tweener, with the hirose on the bottom and the power jack sticking out to the left. Just above the power jack, below the miniDIN pins are 5 vias, laid out like the 5 spots on a die. I traced the bottom left of these vias to be the TxD pin. Check that on the o-scope and see how it looks. Ryan Sean Wheeler wrote: >Ok so I've put my oscope skills to use and found some rather weird stuff on >the MiniDin-8 connector on the tweener. I know you guys were talking about >the hi-rose connector, but I don't really have probes of the appropriate >sizes. Supposedly, pins 3, 4 and 5 are TxD, GND, and RxD respectively. I'm >getting the exact same behavior for all three. The voltages rise and fall >periodically, but in strange shape. The trace is flat through 0 V for >around 2 ms, but then it quickly saturates (above 25 V) before coming back >down, flattening out at 0 V and then displaying the same behavior in the >negative. The period is roughly 17 ms with peak to peak voltage of 50.8 V. >My probe is set to 1x so that's not the problem. If it were 10x then I >could understand getting 50, but it's not. The Gumstix is attached, but I'm >leaving it well alone. Tell me this is supposed to happen... > >-Sean > > |
From: Dave H. <dhy...@gm...> - 2006-07-26 18:47:04
|
Hi Ryan, On 7/26/06, Ryan Rapetti <rjr...@uc...> wrote: > Ok, found the ttl level pins. If this doesn't work figure the hirose or > the UART are bad. First, orientation. I'm looking at the back of the > tweener, with the hirose on the bottom and the power jack sticking out > to the left. Just above the power jack, below the miniDIN pins are 5 > vias, laid out like the 5 spots on a die. I traced the bottom left of > these vias to be the TxD pin. Check that on the o-scope and see how it > looks. I don't have a tweener in front of me - I'm looking at the Eagle files. Are you referring to the via that's under the chip? if so, it connects to pin 12 of the level converter, which is Y0_RXD (according to the schematic). The via for TxD (from the gumstix) is right next to pin 11, which if I have your orientation right, is the top left one. The via under the chip is also really close to a pad as well, so some visual inspection (as hard as it is to do) would be prudent. -- Dave Hylands Vancouver, BC, Canada http://www.DaveHylands.com/ |
From: Ryan R. <rjr...@uc...> - 2006-07-26 19:58:48
|
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta content="text/html;charset=ISO-8859-1" http-equiv="Content-Type"> <title></title> </head> <body bgcolor="#ffffff" text="#000000"> Dave- <br> Hmm, I probably didn't get it right. I am looking at the back though, no chip visible, just the vias. I wasn't able to track it all the way back to the hirose (my closeup vision is good, but not that good), but I figured it to be the TxD line. At any rate, I've rolled up my scope (portable model) and really don't feel up to pulling it out again, so I'll take you word for it. I figure ken's got the right idea though. It must be just the 60Hz AC distorted like crazy. **Pulls out TI-89** Hehe. 17 ms period is 58Hz. Definitely wall power interference.<br> <br> Ryan<br> <br> Dave Hylands wrote:<br> <blockquote cite="mid...@ma..." type="cite"> <pre wrap="">Hi Ryan, On 7/26/06, Ryan Rapetti <a class="moz-txt-link-rfc2396E" href="mailto:rjr...@uc..."><rjr...@uc...></a> wrote: </pre> <blockquote type="cite"> <pre wrap="">Ok, found the ttl level pins. If this doesn't work figure the hirose or the UART are bad. First, orientation. I'm looking at the back of the tweener, with the hirose on the bottom and the power jack sticking out to the left. Just above the power jack, below the miniDIN pins are 5 vias, laid out like the 5 spots on a die. I traced the bottom left of these vias to be the TxD pin. Check that on the o-scope and see how it looks. </pre> </blockquote> <pre wrap=""><!----> I don't have a tweener in front of me - I'm looking at the Eagle files. Are you referring to the via that's under the chip? if so, it connects to pin 12 of the level converter, which is Y0_RXD (according to the schematic). The via for TxD (from the gumstix) is right next to pin 11, which if I have your orientation right, is the top left one. The via under the chip is also really close to a pad as well, so some visual inspection (as hard as it is to do) would be prudent. </pre> </blockquote> <br> </body> </html> |
From: Sean W. <mod...@ho...> - 2006-07-27 14:04:30
|
I'm getting exactly the same behavior.. crazy waves. I've seen this waveform before in a lab, but that was years ago and I have no idea what I was working with anylonger. I feel like it was some sort of op-amp or IC. I suppose that makes sense, but brings me no closer to the problem here. I appreciate your help again, Ryan. -Sean >From: Ryan Rapetti <rjr...@uc...> >Reply-To: "General mailing list for gumstix users." ><gum...@li...> >To: "General mailing list for gumstix users." ><gum...@li...> >Subject: Re: [Gumstix-users] c++ library size/ serial woes remain >Date: Wed, 26 Jul 2006 11:09:31 -0700 > >Ok, found the ttl level pins. If this doesn't work figure the hirose or >the UART are bad. First, orientation. I'm looking at the back of the >tweener, with the hirose on the bottom and the power jack sticking out >to the left. Just above the power jack, below the miniDIN pins are 5 >vias, laid out like the 5 spots on a die. I traced the bottom left of >these vias to be the TxD pin. Check that on the o-scope and see how it >looks. > >Ryan > >Sean Wheeler wrote: > > >Ok so I've put my oscope skills to use and found some rather weird stuff >on > >the MiniDin-8 connector on the tweener. I know you guys were talking >about > >the hi-rose connector, but I don't really have probes of the appropriate > >sizes. Supposedly, pins 3, 4 and 5 are TxD, GND, and RxD respectively. >I'm > >getting the exact same behavior for all three. The voltages rise and >fall > >periodically, but in strange shape. The trace is flat through 0 V for > >around 2 ms, but then it quickly saturates (above 25 V) before coming >back > >down, flattening out at 0 V and then displaying the same behavior in the > >negative. The period is roughly 17 ms with peak to peak voltage of 50.8 >V. > >My probe is set to 1x so that's not the problem. If it were 10x then I > >could understand getting 50, but it's not. The Gumstix is attached, but >I'm > >leaving it well alone. Tell me this is supposed to happen... > > > >-Sean > > > > > >------------------------------------------------------------------------- >Take Surveys. Earn Cash. Influence the Future of IT >Join SourceForge.net's Techsay panel and you'll get the chance to share >your >opinions on IT & business topics through brief surveys -- and earn cash >http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV >_______________________________________________ >gumstix-users mailing list >gum...@li... >https://lists.sourceforge.net/lists/listinfo/gumstix-users |
From: Chris D. <cg...@co...> - 2006-07-27 14:13:54
|
On 7/26/06, Sean Wheeler <mod...@ho...> wrote: > I'm getting exactly the same behavior.. crazy waves. I've seen this > waveform before in a lab, but that was years ago and I have no idea what I > was working with anylonger. I feel like it was some sort of op-amp or IC. I > suppose that makes sense, but brings me no closer to the problem here. Sean, Are these the same crazy waves you described before? The ones that have about a 60Hz frequency and are at an absurd voltage level? I've seen these before too -- when the ground lead in my oscilloscope probe had broken without me realizing it, and I was just picking up capacitively-coupled AC line noise. Does your scope have a separate ground lug on the front of it? When I first encountered this problem, I wasted almost an hour fiddling with things and trying to figure something out. Eventually I gave up and called over my professor, who took one look at the screen, smirked, muttered something about how "these damn things break all the time", and ran an alligator clip from circuit ground to the ground of the 5v square wave calibration output on the front of the scope. Problem solved. best, -chris |
From: Sean W. <mod...@ho...> - 2006-07-27 18:12:45
|
I know the problem is not with the oscope. I wasn't grounding the probe suitably before. Now, when I do, I find certain portions of the board at 5.4 V, some at 3.4 and others (that are supposed to be 5 V like the TxD pin) are 0. I think the component at U$20 (the serial controller?) is burnt. A bummer, true, but a relief as well. -Sean >From: "Chris Danis" <cg...@co...> >Reply-To: "General mailing list for gumstix users." ><gum...@li...> >To: "General mailing list for gumstix users." ><gum...@li...> >Subject: Re: [Gumstix-users] c++ library size/ serial woes remain >Date: Thu, 27 Jul 2006 10:13:48 -0400 > >On 7/26/06, Sean Wheeler <mod...@ho...> wrote: > > I'm getting exactly the same behavior.. crazy waves. I've seen this > > waveform before in a lab, but that was years ago and I have no idea what >I > > was working with anylonger. I feel like it was some sort of op-amp or >IC. I > > suppose that makes sense, but brings me no closer to the problem here. > >Sean, > >Are these the same crazy waves you described before? The ones that >have about a 60Hz frequency and are at an absurd voltage level? I've >seen these before too -- when the ground lead in my oscilloscope probe >had broken without me realizing it, and I was just picking up >capacitively-coupled AC line noise. > >Does your scope have a separate ground lug on the front of it? When I >first encountered this problem, I wasted almost an hour fiddling with >things and trying to figure something out. Eventually I gave up and >called over my professor, who took one look at the screen, smirked, >muttered something about how "these damn things break all the time", >and ran an alligator clip from circuit ground to the ground of the 5v >square wave calibration output on the front of the scope. Problem >solved. > >best, >-chris > >------------------------------------------------------------------------- >Take Surveys. Earn Cash. Influence the Future of IT >Join SourceForge.net's Techsay panel and you'll get the chance to share >your >opinions on IT & business topics through brief surveys -- and earn cash >http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV >_______________________________________________ >gumstix-users mailing list >gum...@li... >https://lists.sourceforge.net/lists/listinfo/gumstix-users |
From: Dave H. <dhy...@gm...> - 2006-07-27 18:22:36
|
Hi Sean, On 7/27/06, Sean Wheeler <mod...@ho...> wrote: > I know the problem is not with the oscope. I wasn't grounding the probe > suitably before. Now, when I do, I find certain portions of the board at > 5.4 V, some at 3.4 and others (that are supposed to be 5 V like the TxD pin) > are 0. I think the component at U$20 (the serial controller?) is burnt. A > bummer, true, but a relief as well. TxD on the output of the serial converter should actually idle at around -5v, and on the input to the serial converter (which is from the hirose connector) should be around 3.3v. If it's at 0v then that's a bad sign. I've had one of my tweeners partially stop working ( i think I could see output but not type anything), and I never bothered to investigate why, I just bought a couple more. -- Dave Hylands Vancouver, BC, Canada http://www.DaveHylands.com/ |
From: Ryan R. <rjr...@uc...> - 2006-07-27 20:32:56
|
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta content="text/html;charset=ISO-8859-1" http-equiv="Content-Type"> <title></title> </head> <body bgcolor="#ffffff" text="#000000"> <!---->Well Sean, I'd say the next step is to try and pull the signal straight off of the gumstix. You'll probably need a connex card to power the gumstix so you can get at the hirose (ideal), or look and see if you can pull the signal off of the vias on the gumstix itself. They're a lot smaller than the vias on the tweener, so this will be tricky. You'll probably want a magnifying glass so your eyes don't fall out. If you have small enough probes, great. Otherwise, it should be possible to insert a copper filament (from a stranded wire or very small magnet wire) into the via to get a connection. A little poking should clean the lacquer off of the board and expose the contact. If you're still not getting a signal then figure something is bad on the gumstix.<br> <br> Ryan<br> <blockquote cite="mid...@ma..." type="cite"> <pre wrap="">TxD on the output of the serial converter should actually idle at around -5v, and on the input to the serial converter (which is from the hirose connector) should be around 3.3v. If it's at 0v then that's a bad sign. I've had one of my tweeners partially stop working ( i think I could see output but not type anything), and I never bothered to investigate why, I just bought a couple more. </pre> </blockquote> <br> </body> </html> |
From: Dave H. <dhy...@gm...> - 2006-07-26 18:33:48
|
Hi Sean, On 7/26/06, Sean Wheeler <mod...@ho...> wrote: > Ok so I've put my oscope skills to use and found some rather weird stuff on > the MiniDin-8 connector on the tweener. I know you guys were talking about > the hi-rose connector, but I don't really have probes of the appropriate > sizes. Supposedly, pins 3, 4 and 5 are TxD, GND, and RxD respectively. I'm > getting the exact same behavior for all three. The voltages rise and fall > periodically, but in strange shape. The trace is flat through 0 V for > around 2 ms, but then it quickly saturates (above 25 V) before coming back > down, flattening out at 0 V and then displaying the same behavior in the > negative. The period is roughly 17 ms with peak to peak voltage of 50.8 V. > My probe is set to 1x so that's not the problem. If it were 10x then I > could understand getting 50, but it's not. The Gumstix is attached, but I'm > leaving it well alone. Tell me this is supposed to happen... Can you check pin 11 (Y0_TXD) on the rs232 level converter chip? It should be at 3.3v Pin 14 should be at some -ve voltage. This pin should be tied more or less directly to the TxD on the Mini-DIN8. I see some ferrite beads in the schematix as well. FB6 would be a good test point. There is a row of 3 beads in a row right next to the Mini-DIN8. The one closest to the edge with the power jack is FB6. The voltage converter relies on the caps to work properly, so if there were a cold solder joint, or bad solder joint, or a short or anything then that might explain what you're seeing. C13 in particular has a via really close to one of the pads. I'd check to make sure there isn't any excess solder or anything causing a problem. -- Dave Hylands Vancouver, BC, Canada http://www.DaveHylands.com/ |
From: Sean W. <mod...@ho...> - 2006-07-26 21:18:32
|
Hey, Dave. Alright, I'm getting the same strangeness at those points too. I think I may see a potential problem with the pad on C11 and the hole (via?) next to it (between itself and C13). It seems to be touching with the faintest tip of the corner to the metal around the hole. The footpad of C13 is touching the trace from FB7 (the middle one) which runs to U$20 and also touches the hole next to C13. Those two holes are connected on the opposite side of the board. Is this supposed to be? Did you follow that convoluted nonsense? :) Thanks for your help, Dave. -Sean >From: "Dave Hylands" <dhy...@gm...> >Reply-To: "General mailing list for gumstix users." ><gum...@li...> >To: "General mailing list for gumstix users." ><gum...@li...> >Subject: Re: [Gumstix-users] c++ library size/ serial woes remain >Date: Wed, 26 Jul 2006 11:19:24 -0700 > >Hi Sean, > >On 7/26/06, Sean Wheeler <mod...@ho...> wrote: > > Ok so I've put my oscope skills to use and found some rather weird stuff >on > > the MiniDin-8 connector on the tweener. I know you guys were talking >about > > the hi-rose connector, but I don't really have probes of the appropriate > > sizes. Supposedly, pins 3, 4 and 5 are TxD, GND, and RxD respectively. >I'm > > getting the exact same behavior for all three. The voltages rise and >fall > > periodically, but in strange shape. The trace is flat through 0 V for > > around 2 ms, but then it quickly saturates (above 25 V) before coming >back > > down, flattening out at 0 V and then displaying the same behavior in the > > negative. The period is roughly 17 ms with peak to peak voltage of 50.8 >V. > > My probe is set to 1x so that's not the problem. If it were 10x then I > > could understand getting 50, but it's not. The Gumstix is attached, but >I'm > > leaving it well alone. Tell me this is supposed to happen... > >Can you check pin 11 (Y0_TXD) on the rs232 level converter chip? It >should be at 3.3v > >Pin 14 should be at some -ve voltage. This pin should be tied more or >less directly to the TxD on the Mini-DIN8. I see some ferrite beads in >the schematix as well. FB6 would be a good test point. There is a row >of 3 beads in a row right next to the Mini-DIN8. The one closest to >the edge with the power jack is FB6. > >The voltage converter relies on the caps to work properly, so if there >were a cold solder joint, or bad solder joint, or a short or anything >then that might explain what you're seeing. C13 in particular has a >via really close to one of the pads. I'd check to make sure there >isn't any excess solder or anything causing a problem. > >-- >Dave Hylands >Vancouver, BC, Canada >http://www.DaveHylands.com/ > >------------------------------------------------------------------------- >Take Surveys. Earn Cash. Influence the Future of IT >Join SourceForge.net's Techsay panel and you'll get the chance to share >your >opinions on IT & business topics through brief surveys -- and earn cash >http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV >_______________________________________________ >gumstix-users mailing list >gum...@li... >https://lists.sourceforge.net/lists/listinfo/gumstix-users |
From: Dave H. <dhy...@gm...> - 2006-07-26 22:04:32
|
Hi Sean, > Alright, I'm getting the same strangeness at those points too. I think I > may see a potential problem with the pad on C11 and the hole (via?) next to > it (between itself and C13). It seems to be touching with the faintest tip > of the corner to the metal around the hole. The footpad of C13 is touching > the trace from FB7 (the middle one) which runs to U$20 and also touches the > hole next to C13. Those two holes are connected on the opposite side of the > board. Is this supposed to be? Did you follow that convoluted nonsense? > :) I'll refer to left and right assuming that you're holding the board with the hirose on the left and the Mini-DIN8 on the right (that's how it is in Eagle). The two vias (holes) near C11 an C13 connect to each other and the right side of C11 and the right side of C13 and the left side of FB7, and they should all be ground (which is also on the right hand side of the power jack). The other side of FB7 should go to the ground pin (center pin) on the Mini-DIN8. And as ken mentioned, you need to connect the ground side of your oscope probe to somewhere along here for all of your measurements (I'd use the right side of the power jack since its nice and big). -- Dave Hylands Vancouver, BC, Canada http://www.DaveHylands.com/ |
From: Sean W. <mod...@ho...> - 2006-07-28 19:15:20
|
Dave, Yep, done and done. I get nothing on the mini-dim. I connected ground to the right side of the jack. So... dead? Thanks, you guys. Maybe now I can move forward with my project. -Sean >From: "Dave Hylands" <dhy...@gm...> >Reply-To: "General mailing list for gumstix users." ><gum...@li...> >To: "General mailing list for gumstix users." ><gum...@li...> >Subject: Re: [Gumstix-users] c++ library size/ serial woes remain >Date: Wed, 26 Jul 2006 14:39:53 -0700 > >Hi Sean, > > > Alright, I'm getting the same strangeness at those points too. I think >I > > may see a potential problem with the pad on C11 and the hole (via?) next >to > > it (between itself and C13). It seems to be touching with the faintest >tip > > of the corner to the metal around the hole. The footpad of C13 is >touching > > the trace from FB7 (the middle one) which runs to U$20 and also touches >the > > hole next to C13. Those two holes are connected on the opposite side of >the > > board. Is this supposed to be? Did you follow that convoluted >nonsense? > > :) > >I'll refer to left and right assuming that you're holding the board >with the hirose on the left and the Mini-DIN8 on the right (that's how >it is in Eagle). > > >The two vias (holes) near C11 an C13 connect to each other and the >right side of C11 and the right side of C13 and the left side of FB7, >and they should all be ground (which is also on the right hand side of >the power jack). The other side of FB7 should go to the ground pin >(center pin) on the Mini-DIN8. > >And as ken mentioned, you need to connect the ground side of your >oscope probe to somewhere along here for all of your measurements (I'd >use the right side of the power jack since its nice and big). > >-- >Dave Hylands >Vancouver, BC, Canada >http://www.DaveHylands.com/ > >------------------------------------------------------------------------- >Take Surveys. Earn Cash. Influence the Future of IT >Join SourceForge.net's Techsay panel and you'll get the chance to share >your >opinions on IT & business topics through brief surveys -- and earn cash >http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV >_______________________________________________ >gumstix-users mailing list >gum...@li... >https://lists.sourceforge.net/lists/listinfo/gumstix-users |
From: ken s. <ken...@gm...> - 2006-07-26 19:36:47
|
Hi Sean, On 7/26/06, Sean Wheeler <mod...@ho...> wrote: > Ok so I've put my oscope skills to use and found some rather weird stuff on > the MiniDin-8 connector on the tweener. I know you guys were talking about > the hi-rose connector, but I don't really have probes of the appropriate > sizes. Supposedly, pins 3, 4 and 5 are TxD, GND, and RxD respectively. I'm > getting the exact same behavior for all three. The voltages rise and fall > periodically, but in strange shape. The trace is flat through 0 V for > around 2 ms, but then it quickly saturates (above 25 V) before coming back > down, flattening out at 0 V and then displaying the same behavior in the > negative. The period is roughly 17 ms with peak to peak voltage of 50.8 V. > My probe is set to 1x so that's not the problem. If it were 10x then I > could understand getting 50, but it's not. The Gumstix is attached, but I'm > leaving it well alone. Tell me this is supposed to happen... > This sounds like a grounding issue. Your scope probe is seeing 60Hz AC that is capacitively (we hope) coupled. As a sanity check, measure the 3.3v regulator output. It should be 3.3v DC. Regards, Ken |
From: Sean W. <mod...@ho...> - 2006-07-28 17:24:02
|
Hi, Ken It seems that you are right. I now believe that it is a grounding issue. I measured the voltage of the power jack (w/o connecting it to tweener) and it gives me around 5 volts. If I disconnect the ground, however, it gives me the problem waveform. It seems I wasn't truly grounding my probe when trying to measure the pins. I found a more suitable ground than the one I was trying to use and I get 0 V on all the pins on the MiniDin8. Holy smokes! I just noticed something. Is C26 supposed to actually have a capacitor? I see the pads with solder, but not little chunk of dielectric! Is this normal? There seems to be little indentation in the solder where a capacitor *used* to be, but that could just be me wanting to see it. This would make a break in the circuit... -Sean >From: "ken staton" <ken...@gm...> >Reply-To: "General mailing list for gumstix users." ><gum...@li...> >To: "General mailing list for gumstix users." ><gum...@li...> >Subject: Re: [Gumstix-users] c++ library size/ serial woes remain >Date: Wed, 26 Jul 2006 12:34:59 -0700 > >Hi Sean, > >On 7/26/06, Sean Wheeler <mod...@ho...> wrote: > > Ok so I've put my oscope skills to use and found some rather weird stuff >on > > the MiniDin-8 connector on the tweener. I know you guys were talking >about > > the hi-rose connector, but I don't really have probes of the appropriate > > sizes. Supposedly, pins 3, 4 and 5 are TxD, GND, and RxD respectively. >I'm > > getting the exact same behavior for all three. The voltages rise and >fall > > periodically, but in strange shape. The trace is flat through 0 V for > > around 2 ms, but then it quickly saturates (above 25 V) before coming >back > > down, flattening out at 0 V and then displaying the same behavior in the > > negative. The period is roughly 17 ms with peak to peak voltage of 50.8 >V. > > My probe is set to 1x so that's not the problem. If it were 10x then I > > could understand getting 50, but it's not. The Gumstix is attached, but >I'm > > leaving it well alone. Tell me this is supposed to happen... > > > >This sounds like a grounding issue. >Your scope probe is seeing 60Hz AC that is capacitively (we hope) coupled. >As a sanity check, measure the 3.3v regulator output. It should be 3.3v DC. > >Regards, >Ken > >------------------------------------------------------------------------- >Take Surveys. Earn Cash. Influence the Future of IT >Join SourceForge.net's Techsay panel and you'll get the chance to share >your >opinions on IT & business topics through brief surveys -- and earn cash >http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV >_______________________________________________ >gumstix-users mailing list >gum...@li... >https://lists.sourceforge.net/lists/listinfo/gumstix-users |
From: Dave H. <dhy...@gm...> - 2006-07-28 19:13:31
|
Hi Sean, > Holy smokes! I just noticed something. Is C26 supposed to actually have a > capacitor? I see the pads with solder, but not little chunk of dielectric! > Is this normal? There seems to be little indentation in the solder where a > capacitor *used* to be, but that could just be me wanting to see it. This > would make a break in the circuit... C26 should have a 1.0 uF capacitor. It's a filtering capacitor on the input side of the voltage regulator. It may be possible that things would work without it. You can tell by checking to see if you're getting 3.3v out of the voltage regulator. If not, then that would be the problem (some voltage regultors don't work properly without the filtering caps on the input or output, some do but not not as well). However, the fact that the capcitor even fell out, means that both side were effectively cold soldered. given that there's some cold solder joints, the likelyhood is quite high that there are others. -- Dave Hylands Vancouver, BC, Canada http://www.DaveHylands.com/ |
From: ken s. <ken...@gm...> - 2006-07-29 17:52:57
|
Dave & Sean, On 7/28/06, Dave Hylands <dhy...@gm...> wrote: > Hi Sean, > > > Holy smokes! I just noticed something. Is C26 supposed to actually have a > > capacitor? I see the pads with solder, but not little chunk of dielectric! > > Is this normal? There seems to be little indentation in the solder where a > > capacitor *used* to be, but that could just be me wanting to see it. This > > would make a break in the circuit... > > C26 should have a 1.0 uF capacitor. It's a filtering capacitor on the > input side of the voltage regulator. It may be possible that things > would work without it. You can tell by checking to see if you're > getting 3.3v out of the voltage regulator. > > If not, then that would be the problem (some voltage regultors don't > work properly without the filtering caps on the input or output, some > do but not not as well). > > However, the fact that the capcitor even fell out, means that both > side were effectively cold soldered. given that there's some cold > solder joints, the likelyhood is quite high that there are others. I ordered my tweener in early March. It looks like there was a build with C26 as a "no load". Mine works fine without. Check: U$19 pin 5. Should be 3.3v --- Ken |
From: Ryan R. <rjr...@uc...> - 2006-07-27 14:18:08
|
Mine just idles at -5V. If you look at the tweener it has via holes near the hirose. It should be possible to get a signal for your probes off of these. I'll check the schematics and see what I can find. Ryan Sean Wheeler wrote: >Ok so I've put my oscope skills to use and found some rather weird stuff on >the MiniDin-8 connector on the tweener. I know you guys were talking about >the hi-rose connector, but I don't really have probes of the appropriate >sizes. Supposedly, pins 3, 4 and 5 are TxD, GND, and RxD respectively. I'm >getting the exact same behavior for all three. The voltages rise and fall >periodically, but in strange shape. The trace is flat through 0 V for >around 2 ms, but then it quickly saturates (above 25 V) before coming back >down, flattening out at 0 V and then displaying the same behavior in the >negative. The period is roughly 17 ms with peak to peak voltage of 50.8 V. >My probe is set to 1x so that's not the problem. If it were 10x then I >could understand getting 50, but it's not. The Gumstix is attached, but I'm >leaving it well alone. Tell me this is supposed to happen... > >-Sean > > > |
From: Dave H. <dhy...@gm...> - 2006-07-28 02:17:26
|
Hi Sean, > I was able to determine that the problem does not rest with the host > computer or the cable however I was getting inconsistent results when > probing the tweener serial port for idle voltages. Sometimes I'd have a > strong voltage... other times I'd have around 0. I even switched tweeners > out, but wasn't getting anything there either. I wonder now if it's not a > problem with the hi-rose connector pins. At a glance, nothing seems > broken/bent out of whack. Any thoughts? Thanks. What daughtercard are you using with the tweener? -- Dave Hylands Vancouver, BC, Canada http://www.DaveHylands.com/ |
From: Sean W. <mod...@ho...> - 2006-07-28 20:01:09
|
I'll be using Gumstix with tweener and Robostix. I have yet to actually connect the Robostix, however. -Sean >From: "Dave Hylands" <dhy...@gm...> >Reply-To: "General mailing list for gumstix users." ><gum...@li...> >To: "General mailing list for gumstix users." ><gum...@li...> >Subject: Re: [Gumstix-users] c++ library size/ serial woes remain >Date: Tue, 25 Jul 2006 15:42:14 -0700 > >Hi Sean, > > > I was able to determine that the problem does not rest with the host > > computer or the cable however I was getting inconsistent results when > > probing the tweener serial port for idle voltages. Sometimes I'd have a > > strong voltage... other times I'd have around 0. I even switched >tweeners > > out, but wasn't getting anything there either. I wonder now if it's not >a > > problem with the hi-rose connector pins. At a glance, nothing seems > > broken/bent out of whack. Any thoughts? Thanks. > >What daughtercard are you using with the tweener? > >-- >Dave Hylands >Vancouver, BC, Canada >http://www.DaveHylands.com/ > >------------------------------------------------------------------------- >Take Surveys. Earn Cash. Influence the Future of IT >Join SourceForge.net's Techsay panel and you'll get the chance to share >your >opinions on IT & business topics through brief surveys -- and earn cash >http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV >_______________________________________________ >gumstix-users mailing list >gum...@li... >https://lists.sourceforge.net/lists/listinfo/gumstix-users |