Windows USB example

[arunpk]

Please help me regarding this !!!!!!!!!!!!!... i have entered correct VID & PID for the device but this application is not showing the device connected......
i tried to connect USB relay board which uses Microchip Pic 18 series.... I want to control those relays through USB......

[wysota]

Are you sure your device is compliant with this example?

[arunpk]

My device is getting connected with this app....... now the proble is that, wen am creating file ReadHandle and WriteHandle bot are getting value 0xffffffff...... i tried by changing the values but no use..... when i tried to display device path its showing correct only...... CreateFile function always returns 0xffffffff only..............

[galrub]

Hello, I am using this example and it seems to be recognizing my HID device just fine in the checkUSB(),
but, in the winEvent I am getting wParam = 7 all the time, both when I connect or disconnect the device, so it doesn't catch these events:
DBT_DEVICEARRIVAL = 0x8000 and DBT_DEVICEREMOVECOMPLETE = 0x8004.

any ideas?
Thanks

[stringer]

My device is getting connected with this app....... now the proble is that, wen am creating file ReadHandle and WriteHandle bot are getting value 0xffffffff...... i tried by changing the values but no use..... when i tried to display device path its showing correct only...... CreateFile function always returns 0xffffffff only..............

Try to use this libraries and demos: microchip.com

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Added after 6 minutes:

Hello, I am using this example and it seems to be recognizing my HID device just fine in the checkUSB(),
but, in the winEvent I am getting wParam = 7 all the time, both when I connect or disconnect the device, so it doesn't catch these events:
DBT_DEVICEARRIVAL = 0x8000 and DBT_DEVICEREMOVECOMPLETE = 0x8004.

any ideas?
Thanks

Try to add this line into .pro file:

DEFINES += _WIN32_WINNT=0x0501

DEFINES += _WIN32_WINNT=0x0501

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[galrub]

Try to use this libraries and demos: microchip.com

---

Added after 6 minutes:

Try to add this line into .pro file:

DEFINES += _WIN32_WINNT=0x0501

DEFINES += _WIN32_WINNT=0x0501

To copy to clipboard, switch view to plain text mode 

well, it's just a part of the issue, I just realized that the USB hub for the front panel of this PC is, well, not a very 'well built' one,
so this is why I get the wParam = 7, I tried using the USB socket in the back... no problem there.
thanks.

[SteveH]

Hi All,

I've followed this thread with great interest and with Gavagai's very usefull initial sourcefiles and everyone else's additions I finally managed to get a working usb interface between my PIC 4550 chip and a pc. I've attached my sources for both ends of the link so that others might find them useful. I also added some extra error trapping to make my life easier.

Note the PIC end is on a Mikroelectronica EasyPIC4 board using their C Pro software.

[Marc van der Kamp]

Hi All,
After I found this example I was very happy and even before trying I modified it to match with my application... then I found out that device detection worked properly but write failed.
I get a proper read and write handle, no errors at write, but... it seems to send nothing.

I went back to the example changed nothing but MY_DEVICE_VIDPID and added a debug message after WriteFile to check BytesWritten
It may be clear that the protocol to my device differs, but I should at least be able to send something even when it is wrong -- or not?
If I only received an error would help already

any ideas?
Thanks

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BytesWritten always 0

[Marc van der Kamp]

Oops... inverted my error checking, WriteFile did give an error (87)

[SibelLa]

Hi there,
I have the same error..I am wondering if you managed to fix it!!
Thanks

[SibelLa]

Hi Marc van der Kamp,

I am still getting error 87.. Have you fixed it ? I really need to make it work..
Please help me..

Many thanks

Oops... inverted my error checking, WriteFile did give an error (87)

Hi Marc van der Kamp,

I am still getting error 87.. Have you fixed it ? I really need to make it work..
Please help me..

Many thanks