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No Propeller Chip Found.... Please Help!! — Parallax Forums

No Propeller Chip Found.... Please Help!!

jeqbrownjeqbrown Posts: 7
edited 2010-02-15 14:26 in Propeller 1
Hi. I have been excited about getting started with the propeller for quite some time now. I just received 4 new chips yesterday and have built the circuit in the PEFun labs to test them. I have good clean 3.3V fed to both pins 12 and 32. All wiring is correct. I am attempting to connect with the USB prop plug via F7(identify hardware). The prop plug registers as a USB serial port whenever it is plugged in. I have tried changing the latency, but no joy. I have searched and haven't been able to find any helpful information.

PLEASE HELP

Comments

  • BTXBTX Posts: 674
    edited 2010-02-13 19:57
    Hi.
    Are you sure all is well connected ?? if propeller is power up and propplug is corrected connected to it, all should work.
    I gues that you have a mistake in wirings.

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    Regards.

    Alberto.
  • TonyWaiteTonyWaite Posts: 219
    edited 2010-02-13 20:03
    Hi,

    We've all been there. ... so we will be able to solve your problem quickly so that you can get on.

    Could you please add a clear photograph of your board so that we can identify the likely culprits?

    Regards,

    T o n y
  • Mike GreenMike Green Posts: 23,101
    edited 2010-02-13 20:08
    Try uninstalling or disabling the USB driver for the USB serial port, then reinstalling a freshly downloaded copy of the FTDI driver. If, for some reason, the default Windows driver is used, it won't work for programming with the PropClip.

    Double check your connections. Triple check your connections. What looks correct and good may not be.
  • Toby SeckshundToby Seckshund Posts: 2,027
    edited 2010-02-13 20:10
    I don't know the cct exactly, I tend to always use DemoBoard ish ones.

    Is the serial in/out the right way around ie P30/P31 (one that caught me using MAX3232), does the USB do a loop back with the Prop removed, is it just the first time the PropTool refuses to recognize it, does a second immediate attempt succeed, are the BOE and /RST ccts correct.

    Post some more details and many will help.

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    Style and grace : Nil point
  • jeqbrownjeqbrown Posts: 7
    edited 2010-02-13 20:40
    Here is a picture of my board.
    Loop back works with the terminal...
    P1020780.JPG
    2560 x 1920 - 2M
  • TonyWaiteTonyWaite Posts: 219
    edited 2010-02-13 20:54
    Arrgghh!

    Everything's out by one hole!

    See page 2 of the following schematic!

    T o n y

    http://www.igniteautomation.com/docs/PPBD_A Schematic.pdf

    For example, count nine pins down - should be to earth ...

    Post Edited (TonyWaite) : 2/13/2010 9:01:31 PM GMT
  • jeqbrownjeqbrown Posts: 7
    edited 2010-02-13 21:17
    Ok. So I have re-installed the drivers several times. I corrected the one pin off thing I had going on in the picture. I have verified all connections and volatages several times. When I loop back the Tx/Rx it echos to the terminal. I have tried all four chips now and I can't get a thing.

    Post Edited (jeqbrown) : 2/15/2010 3:31:58 AM GMT
  • TonyWaiteTonyWaite Posts: 219
    edited 2010-02-13 21:25
    Ok: I understand that the wiring has now been corrected

    Could you please post us a new photo?

    T o n y
  • jeqbrownjeqbrown Posts: 7
    edited 2010-02-13 21:39
    Firstly, thank you for all of the help. Here is a picture of my wiring as of current. I don't think that there is anything off now, but I have already proven that I am capable of mistakes....
    P1020782.JPG
    1280 x 960 - 192K
  • Toby SeckshundToby Seckshund Posts: 2,027
    edited 2010-02-13 22:02
    So is it still not working?

    There is always that P0 is pin1 ..... you can get and print out stickies for the chip. I think (hope) they are open ish. Scale, print and stick

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    Style and grace : Nil point
    doc
    doc
    P8X32A_Stickers.doc
    878K
  • hover1hover1 Posts: 1,929
    edited 2010-02-13 22:07
    The new connections look correct. I just don't see any regulators or capacitors in the picture. I assume they are outside of the picture. The only thing I can't see is the crystal placement. Are the leads from the crystal going to pins 30 and 31 and not 29 and 32?

    I have had some problems with the jumper wires being to short and not making connection on the breadboard, such as the connection to pin 12 of the Prop, (right side). It may not be making connection to the breadboard socket?

    Jim
    jeqbrown said...
    Firstly, thank you for all of the help. Here is a picture of my wiring as of current. I don't think that there is anything off now, but I have already proven that I am capable of mistakes....
  • jeqbrownjeqbrown Posts: 7
    edited 2010-02-13 22:19
    Well, It just started intermittantly reporting back ok. I noticed my supply voltage had sagged a bit and corrected it and it started (sorta) working. I need a better pwr supply..
  • Phil Pilgrim (PhiPi)Phil Pilgrim (PhiPi) Posts: 23,514
    edited 2010-02-13 22:30
    You also need some bypass caps (0.1µF ceramic) across the Vdd and Gnd pins on the Prop. Another for the EEPROM would also be helpful.

    -Phil
  • hover1hover1 Posts: 1,929
    edited 2010-02-13 22:39
    I mentioned caps, but like Phil said, they should be located close to the Prop chip.
    Phil Pilgrim (PhiPi) said...
    You also need some bypass caps (0.1µF ceramic) across the Vdd and Gnd pins on the Prop. Another for the EEPROM would also be helpful.

    -Phil
  • Toby SeckshundToby Seckshund Posts: 2,027
    edited 2010-02-13 23:43
    Find another forum where so many answers crop up so quickly.

    The Prop works from 2.5-4.2 V ok but decoupling is VERY important

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    Style and grace : Nil point
  • hover1hover1 Posts: 1,929
    edited 2010-02-13 23:56
    Toby,

    That's very unlike your most helpfull posts.

    I think most new users are unaware of the importance of putting caps close to the processor. Yes, it shows up on the schematic but it doesn't show the placement criteria.

    Jim
    Toby Seckshund said...
    Find another forum where so many answers crop up so quickly.

    The Prop works from 2.5-4.2 V ok but decoupling is VERY important

  • Phil Pilgrim (PhiPi)Phil Pilgrim (PhiPi) Posts: 23,514
    edited 2010-02-14 01:54
    hover1,

    I'm quite sure Toby's post was not intended to be sarcastic. Phrased another way, I'm sure he meant, "Where would you find another forum where so many answers crop up so quickly?" or "I would challenge anyone to find another forum where so many answers crop up so quickly."

    -Phil
  • hover1hover1 Posts: 1,929
    edited 2010-02-14 02:42
    Phil, of course you are correct.

    Our eyes sometimes read into things where we should not.

    "Find another forum"·looked like·"Go find another forum".

    My apologies Toby, blush.gif

    Jim
    Phil Pilgrim (PhiPi) said...
    hover1,

    I'm quite sure Toby's post was not intended to be sarcastic. Phrased another way, I'm sure he meant, "Where would you find another forum where so many answers crop up so quickly?" or "I would challenge anyone to find another forum where so many answers crop up so quickly."

    -Phil
  • rjo_rjo_ Posts: 1,825
    edited 2010-02-14 03:02
    Jeb...

    Welcome to the Prop... you could not have made a better choice.

    On the frustration quotient... it helps to remember ... your prop is fine. Your Prop Plug is fine. It is possible to destroy a pin and it is possible to destroy a PLL, but that is about it.

    Sounds like a power supply problem... give your prop plug a good long rest.

    You don't show the bottom of your board. Grounding errors can also cause this sort of thing... and they can be anywhere.

    In my life before Parallax, when this sort of thing happened, the problem could have been anywhere... with Parallax products, I now know with near certainty that if it isn't working... I've done something wrong. It is just a matter of finding my error... or how long it is that I asked for help. In the beginning, you are absolutely right to ask immediately.

    If you do destroy a Prop, I will be hosting a free dinner around the time of the introduction of the PropII. We will be giving out various awards.



    Rich
  • Toby SeckshundToby Seckshund Posts: 2,027
    edited 2010-02-14 11:01
    Hover1

    It is all my fault for posting minimal words just before switching off. Yes, of course, I was complimenting everybody (Perhaps it wasn't those elves that drank all the apple juice).



    rjo_

    They don't like a 9 Volt PSU (directly) . Been there .... although the SD card worked again after it cooled down !!!



    jeqbrown

    Anyway how is the "missing" Prop today

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    Style and grace : Nil point
  • LeonLeon Posts: 7,620
    edited 2010-02-14 11:15
    Those solderless breadboards can be unreliable, I never use them. Check continuity of each connection from the pin back to where it is supposed to go. You will probably find a bad connection somewhere. You could also remove everything and start from scratch with just the Propeller chip, you don't need the EEPROM and crystal for initial testing.

    Leon

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    Amateur radio callsign: G1HSM
  • hover1hover1 Posts: 1,929
    edited 2010-02-14 18:13
    @jeqbrown
    Any joy yet?
    Jim
  • CannibalRoboticsCannibalRobotics Posts: 535
    edited 2010-02-15 01:42
    I don't work with the 40 pin DIP's but on the 44's you need 10K pull ups on both of the EEPROM data lines. This one has only one. I'm not too sure of the value either - is it a 1K? - looks a little redish on the multiplier?
    Jim-

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  • jeqbrownjeqbrown Posts: 7
    edited 2010-02-15 03:16
    Thanks for all of the helpful feedback everyone.
    Got the chips working.
  • Phil Pilgrim (PhiPi)Phil Pilgrim (PhiPi) Posts: 23,514
    edited 2010-02-15 03:18
    So what did you change? Just "got the chips working" is a bit unsatisfying for those who tried to help. smile.gif

    -Phil
  • jeqbrownjeqbrown Posts: 7
    edited 2010-02-15 14:18
    Sorry everyone. Once the chips were up and running, I was off to the races to get started experimenting and didn't take the time to get back on here and thank you all. The addition of 0.1uF bypass caps as well as another 10K pull-up on the other EEPROM data line did the trick. I am currently working at getting an experiment board made up with onboard power regulation so I can 'experiment' more reliably. Thanks again for all of your help.
  • CannibalRoboticsCannibalRobotics Posts: 535
    edited 2010-02-15 14:26
    What was it?
    One of the great things about the forum is that when a suggestion works, it's nice to report it.
    Glad you got it working! Kiss everyone goodbye for a while - your a propellor head now.

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    Signature space for rent!
    Send $1 to CannibalRobotics.com.
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