USBDemo, something to learn USB a little bit

[Darrel Taylor]

Sure it will!

Did you have...

DEFINE OSC 48

I use 48mhz CPU with USB without any problems.
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[Noise.be]

Here is my version of the code

[Darrel Taylor]

I can't make it NOT recognize the device when the OSC is 48 with 20mhz crystal.

Did you increase the size of the VUSB cap like mister_e suggested?

The way you have it now, the CPU is running at 24mhz. But, PBP thinks it 48mhz because of the DEFINE OSC 48. Any Time related statements will take twice as long.

If you are going to leave it at 24mhz? You should change to
DEFINE OSC 24

But I'd suggest trying 48 again.
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[Noise.be]

Yup I've changed the cap to 220nF
I've tried many configurations

20MHz Crystal
__CONFIG _CONFIG1L, _PLLDIV_5_1L & _CPUDIV_OSC1_PLL2_1L & _USBDIV_2_1L ;with OSC 48 ; NON-WORKING
__CONFIG _CONFIG1L, _PLLDIV_5_1L & _CPUDIV_OSC3_PLL4_1L & _USBDIV_2_1L ;with OSC 24 ; WORKING

4MHz Crystal
__CONFIG _CONFIG1L, _PLLDIV_1_1L & _CPUDIV_OSC1_PLL2_1L & _USBDIV_2_1L ; with OSC 48 ; NON-WORKING ;Original post
__CONFIG _CONFIG1L, _PLLDIV_1_1L & _CPUDIV_OSC3_PLL4_1L & _USBDIV_2_1L ; with OSC 24 ; WORKING

[Noise.be]

I've seeking all the day to find the solution, I thus don't find it now I would continue to use it under 24MHz
But now I am occupied to migrate the code from VB6 towards VB.NET 2005 but I have a problem. I suppose that the post here is not welcome ?

[mister_e]

unless you have a faulty PIC, a faulty OSC , or your Vusb cap it too low (or bad), it have to work AS IS.

Windows XP or Vista?

Connected on a USB HUB or not?

For the code conversion i can't help, i still use VB6. Start a new thread, maybe some could give you some tips.

[Squibcakes]

Hi mr_e,

I'm learning how to use Easy HID, and have a question about the PBP output files.

If I copy the files into the same folder as as your demo files (using same names etc) and then run, the push buttons don't have an effect and the 2 var POTS don't work, LEDS and PWM are ok.

After doing a compare with your original files and the easy HID output the difference is in the DESCUSBDemo.asm file.

There are two lines that perhaps you have manually modified?? They are in the **** INPUT OUTPUT REPORT ***** sections, specifically:

    ; report count (number of fields)
    retlw	0x95
    retlw	0x08

Why have you have changed the value from EasyHIDs default of 40 to 8?

Once changing the value from 40 to 8 my EasyHID files work with your VB program.



Cheers
Squib