Need Help with USB using PIC18F2455

[mister_e]

DoUSBIn:
        USBBufferCount = USBBufferSizeRX ' RX buffer size
        USBService ' keep connection alive
        USBIn 1, USBBuffer, USBBufferCount, TimeOut ' No data?, Getout of here
TimeOut:
return

Do you still have the USB connection error?

Maybe better to begin with USBDemo and work around with? There's a load of information in that thread (ok ~180 post to read but)

[iugmoh]

I have the same problem I can't use your USBDEMO since I don't have pic18f4450 but I have pic18LF445, so in microcode when I switch to this model I have compile error

ERROR: Macro USBINIT? not found in macro file.
ERROR: Macro USBSERVICE? not found in macro file.
ERROR: Macro USBIN?CBBL not found in macro file.
ERROR: Macro USBOUT?CBBL not found in macro file.

[mister_e]

You must mean 18F4455, so just use the files in attachment. Tested and work as expected here. i just forgot to change the device name in the top comments...

@Darrel... link to this one too

[iugmoh]

There is an error:
ERROR Line 78: Syntax error. (USBDemo_4455.pbp)

this line : UCFG = %00010100 ' enable internal USB pull-up, Full speed USB


but when I comment it , it's compiled without any errors

[mister_e]

HA! so that mean you may use V2.47 of the compiler right?

I thought i would remove the

UCFG    var byte EXT

line because some had 'Redefinition of VAR' problem with V2.50.. anyways, it should work, unless you know what else to add

I'm a bit mixed-up... your thread name is Need Help with USB using PIC18F2455

[iugmoh]

yes I'm use PBP247 , oky I compile and load the hex file but the same problem

I have some questions:
1)Can I use any type of the 470nF capacitor because I'm not use ceramic I use mica
2) Does I need special way to load my hex file to pic or any programmer, I use superpro 280U programmer.

[mister_e]

You shouldn't have any problem with mica cap.

In your device programmer software you may have an option to program the config fuses setting or not. I don't have this specific programmer and seems their software refuse to install on my machine... so i can't really help you on that.

Have you already program other PICs with this one?