Disable USB please help...

Hi all,
I have a problem with 18f4550. I use pic basic pro and when I send information from pc, I want to show this info on 16-segments. But, in my experiences, if usb module is active, I can't use 16-segments ( I use 8 of 16-segment) In short, I have to save this incoming info at EEPROM, but again, if USB Module is active, it don't save on EEPROM :s ( I use "write")

My question is, how can I disable USB (to make save) or how can I make save when USB is active

please help me, this is my school project and I have to do this. I can transfer data by Visual basic and use it on 8 of leds, but I have to do it with 16-segment display.

Thanks

NOTE: I'm using Proteus 7.4 simulation, I don't know if a real 18f4550 can save while USB active.

Seeing your code would help...

I've just used the usb wizard ( this is'nt whole code, it's on my desktop, but this code don't work :(( )

Quote:

---

TRISB =%00000000

DEFINE OSC 48
DEFINE LOADER_USED 1

'PORTB = 0

USBBufferSizeMax con 8 ' maximum buffer size
USBBufferSizeTX con 8 ' input
USBBufferSizeRX con 8 ' output

' the USB buffer...
USBBuffer Var Byte[USBBufferSizeMax]
USBBufferCount Var Byte


' ************************************************** **********
' * main program loop - remember, you must keep the USB *
' * connection alive with a call to USBService every couple *
' * of milliseconds or so... *
' ************************************************** **********
' initialise USB...

ProgramStart:

usbinit
gosub DoUSBIn
gosub DoUSBOut

write 0,USBbuffer[1] ' ******* or asd=usbbuffer[1] write 0,asd
'**don't save, why ?


Goto ProgramStart:

' ************************************************** **********
' * receive data from the USB bus *
' ************************************************** **********
DoUSBIn:
USBBufferCount = USBBufferSizeRX ' RX buffer size
USBService ' keep connection alive
USBIn 1, USBBuffer, USBBufferCount, DoUSBIn ' read data, if available
return

' ************************************************** **********
' * wait for USB interface to attach *
' ************************************************** **********
DoUSBOut:
USBBufferCount = USBBufferSizeTX ' TX buffer size
USBService ' keep connection alive
USBOut 1, USBBuffer, USBBufferCount, DoUSBOut ' if bus available, transmit data
return

---

Do a little test...

Code:

---

HIGH LED
write 0,USBbuffer[1]
LOW LED

---

Use a scope to see if there's some activity on LED pin. If not, you may want to comment of of these to see where your program stuck

Code:

---

usbinit
gosub DoUSBIn
gosub DoUSBOut

---

I can't tell for Proteus, but I'm always impressed to see how rich students are ;)

welll I confess, I'm using school computers, for Proteus :D ( I'm not rich :D )

I'll try it by real 4550 but, a little question, when I tried your USBDemo (mister_e), I realized that after resetting the pic, still the same leds are high ( some kind of save I think) but in your codes, there is no "write" command and I tried it with usb wizard just like my example, it works fine but when I reset the pic all leds are off. why yours are still on ?

are you using my schematic?

I don't know your sch. but, I've used a standart sch. I guess it was in micro code studio. easy hid wizard help. but I tried your USB Demo