Pic 18f Usb


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  1. #21
    Join Date
    Feb 2005
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    Essex, UK
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    94


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    Hi Lengcallrobot and welcome to the forums!

    This is taken from the EasyHID help file contained in the EasyHID folder:

    "What is a HID Device?

    ...... One of the major advantages of HID is that you do not need to supply a custom driver, as one is already supplied with the operating system. A limitation of HID is that its data transfer rate is limited to a maximum of 64KB per second. However, this is still significantly faster than RS-232 (115200 baud is approximately 12KB per second)......"

    You should be able to send 64kBytes/sec in Full-speed mode as shown above.

    It looks to me as though you are sending data in Low-speed mode 64kbits/sec (or 8kBytes/sec) from what you have shown.

    Are you using a 48MHz clock source for the USB and have you set bit 2 of the UCFG register to enable Full-speed?

    I could be leading you up the garden path about the speeds but this is my understanding

    Hope this helps

    Rob
    Last edited by Rob; - 15th July 2008 at 09:09. Reason: Really should proof read before posting!

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