USBDemo, something to learn USB a little bit

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  1. - 11th January 2007, 18:56 #1
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    It's up to you guy, you know there's also this tiny model on digital camera ( or PICKIT 2) as well.... i don't remind the name...

    But most of the time, use a 'B type' on the PIC end... if you really want a connector.

    In meantime you can still hack an old USB mouse or buy a few $ USB cable. i got few 6' here in a local electronic store for 2$.

    Please, use an external psu for you tests.... you never know what could happen.

    EDIT.... i thought they could choose a more sophisticated term for those mini-tiny-usb connector... NOP mini-A or mini-B
    http://en.wikipedia.org/wiki/USB
    Last edited by mister_e; - 11th January 2007 at 19:02.
    Steve

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    There's no problem, only learning opportunities.
  2. - 11th January 2007, 20:21 #2
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    Mini- connectors - Those seem to be a bit more prevalent these days as opposed to the older/larger types. Will probably switch over to those in due time. A-type at the PC end, B-type female (mini or not) at the device end.

    External power - yes, most definetly. In the past, I've drawn a small bit of power off the USB bus to charge a small AAA NiMH pack, but the bulk of the power for the circuit comes from the AAA NiMH pack.
  3. - 11th January 2007, 20:25 #3
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    Quote Originally Posted by mister_e View Post
    Please, use an external psu for you tests.... you never know what could happen.
    Oh yes I do

    I have a board that I have been working on and had no problems with it whatsoever until I moved it slightly on the computer desk and my daughter had left a metal hair grip on the desk.

    Now have a PC with 4 dead USB ports on the mobo
    Keith

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  4. - 11th January 2007, 20:33 #4
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    and unless you want to waste your time debugin it... maybe it's just some blown pcb tracks...

    A in-line fuse could be used as well, but i stick with the external PSU.

    To do this one i used Mikroelektronika a EasyPic 4 board.

    Nice board, but the on-board programmer fail sometime with 18Fs device.
    Last edited by mister_e; - 11th January 2007 at 20:38.
    Steve

    It's not a bug, it's a random feature.
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  5. - 12th January 2007, 02:26 #5
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    Bravo, Bravo, Bravo!!!

    Steve that EasyPic 4 board looks fantastic! I see that it has an add on PLCC programming kit but in your experience can it program the PIC18F4550??

    Has anyone made a test PCB for this yet and willing to post on site?

    Cheers
    Squib.
  6. - 12th January 2007, 02:34 #6
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    The on-board programmer work with most PIC. The 18F4550 also work... but sometime it fail to program at the first time, you just need to reprogram it once again... no big deal but sometimes annoying.


    I don't have the PLCC board, but it should work... it's just an adapter, so i don't see why it shouldn't work... unless the programming pins are not at their usual places...
    Last edited by mister_e; - 12th January 2007 at 04:11.
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  7. - 12th January 2007, 04:45 #7
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    Quote Originally Posted by mister_e View Post
    The on-board programmer work with most PIC. The 18F4550 also work... but sometime it fail to program at the first time, you just need to reprogram it once again... no big deal but sometimes annoying.


    I don't have the PLCC board, but it should work... it's just an adapter, so i don't see why it shouldn't work... unless the programming pins are not at their usual places...
    I made an adapter for an '8722 awhile back that puts it in a 40pin 18F socket using a 40 wire ribbon cable on an IDC socket (think '452 with a load more memory), and another 40pin dual row to get to the rest of the pins. Do you think that would work in this? It worked in my mp3 player.
  8. - 12th January 2007, 04:49 #8
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    In theory... all 40 pins device have the programming pins at the same place or the EasyPic 4 would have a second 40 pins dip socket.
    Steve

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  9. - 13th July 2007, 14:14 #9
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    I am looking for this trough hole plcc socket, could anyone help which type , or digikey/mouser part number

    Thanks


  10. - 13th July 2007, 14:36 #10
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    http://www.mikroe.com/en/tools/plcc/
    DT
  11. - 22nd February 2007, 02:41 #11
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    Quote Originally Posted by Squibcakes View Post
    Bravo, Bravo, Bravo!!!

    Steve that EasyPic 4 board looks fantastic! I see that it has an add on PLCC programming kit but in your experience can it program the PIC18F4550??

    Has anyone made a test PCB for this yet and willing to post on site?

    Cheers
    Squib.
    Hi Squibcakes,
    I have an older model 'EasyPic3' and i have no problem to program PIC18F4550. It is a great board and I ma glad owning one.
    Cheers
    Ozion
  12. - 22nd February 2007, 05:01 #12
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    <img src="http://www.pbpgroup.com/files/zombie2.gif" align=middle> &nbsp; &nbsp;Heaven you think?
    Goood..., then you won't notice when I come to collect your PBP soul.

    <div style="background-color:#000000"; layer-background-color:#000000;></div>
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  13. - 22nd February 2007, 13:48 #13
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    Many thanks!!! Got it working, now I'll proceed to port it for my purposes.

    I've change the 2 lines and one thing more

    __CONFIG _CONFIG1L, _PLLDIV_5_1L & _CPUDIV_OSC3_PLL4_1L & _USBDIV_2_1L
    __CONFIG _CONFIG1H, _FOSC_HSPLL_HS_1H & _FCMEM_OFF_1H & _IESO_OFF_1H
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