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Locked18f2550 problem

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Guest
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2005/10/15 10:14:24 (permalink)
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18f2550 problem

hi all,
I am trying to connect my 18f2550 to the USB.
I am using EASYHID as a firmware. I burned the file but my XP didnt "see" the chip.

Is anyone used this firmware and it worked for him?

Can someone send me a HEX file to that chip -just to check if my connection are correct?

Thanks in advance for your help.
#1

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    bob_barr
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    RE: 18f2550 problem 2005/10/16 10:01:46 (permalink)
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    What are you using for the hardware? Is it a board that you've built yourself?

    While it's always good to learn from one's mistakes, it's much easier to learn from the mistakes of others.
    Please don't PM me with technical questions. I'll be quite happy to help (if I can) on the forums.
    #2
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    RE: 18f2550 problem 2005/10/16 14:27:40 (permalink)
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    Yes, I Use breadbord.
    I connected only the VCC GND USB+- to the USB cable.
    20MHZ as Clk.
    the VUSB I connected by4.7uF to the gnd.
    #3
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    RE: 18f2550 problem 2005/10/17 07:55:20 (permalink)
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    You should use 0,22uF instead of 4,7uF

    The PIC18FX455/X550 devices have a built-in 3.3V regulator
    to provide power to the internal transceiver and
    provide a source for the internal/external pull-ups. An
    external 220 nF (±20%) capacitor is required for stability.
    #4
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    RE: 18f2550 problem 2005/10/17 09:44:56 (permalink)
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    I've changed the capacito, but now I get "USB device not recognized - one of the USB device attached to ths computer has malfunction, and windows does not recognize it."
    #5
    Artic
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    RE: 18f2550 problem 2005/10/17 10:24:19 (permalink)
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    Hi,

    Check the other firmware signals needed by your bootloader.

    The Microchip USB bootloader has two pins A1 & A2 which are used by the bootloader to determine how the micro is powered. If these are not correctly connected it will put the bootloader in "detached" state. (or whatever the correct term is in USB world..)

    Hope it helps

    Artic
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    RE: 18f2550 problem 2005/10/17 12:48:48 (permalink)
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    I dont think EASYHID firmware have a bootloader option,In their site and in the help file it never came up.

    Is there any other firmware avaliable for picBasic compiler, supporting bootloader?
    #7
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