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HID USB Bootloader not connecting to PC (PIC18F2550)

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s060340
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2013/07/20 16:07:34 (permalink)
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HID USB Bootloader not connecting to PC (PIC18F2550)

Hi there,
 
I have built a board with a PIC18F2550 and when I try to connect it to the PC, the device is not detected (nothing happens at all).
The pic is flashed with the firmware provided by the application libraries. Although I use the hex that is built for 18F4550, I have used this firmware on a 18F2550 before without problems.
 
In fact, none of my hex's that use USB (and have worked before) seem to result in the PIC being detected by the PC.
 
I have tested led-blinking programs and they work fine, so I suppose the problem is in the USB part.
 
I have read through this thread http://www.microchip.com/...tree=true&m=695983 but it didn't fix the problem.
 
One thing I have noticed is that when the button connected to RB4 (bootloader jumper) is pressed, the Vusb and D+ go from 0V to 3.3V, indicating that the chip goes into boot mode. This happens WITHOUT resetting the device! This is not supposed to happen I think, so this might be linked to the problem..
 
Any help would be greatly appreciated,
 
Dirk
 
#1

2 Replies Related Threads

    s060340
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    Re:HID USB Bootloader not connecting to PC (PIC18F2550) 2013/07/21 01:49:59 (permalink)
    +2 (1)
    I solved the connection problem, it turns out I fried my USB host at some point; none of my other USB devices (mouse, webcam etc) are connecting to the port, when I use the USB port at the back of the PC it works.
     
    Pressing the RB4 still puts the device into bootloader mode without resetting. This is really strange as the 'normal' program should be blank for now..
    #2
    syahbana
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    Re:HID USB Bootloader not connecting to PC (PIC18F2550) 2016/05/20 18:13:53 (permalink)
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    where can I get a book Microchip USB HID Bootloader v2.6a ?
    #3
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