Objective Development Forums

Hi !

My english not good. and I'm not a advanced C programmer. I made a simple AVR USB project with Atmega8. It includes a LCD
ADC, led, etc. My firmware program is running. First I tried simple EasyHID vb6 host program. It runs but
only views plug- onplug messages. there isn't any data transfer.

Firmware usbFunctionSetup has only data[0],1,2,.. controlling and writing to lcd. but only first time views. after not anything.

I tried Visual C++ 6.0 and Dev-C++ compiler. these are gives some compile errors.

in usb.c

> LIST_DEL(usb_busses,bus); // '=' : left operand must be l-value
> LIST_ADD(usb_busses, bus); // '=' : left operand must be l-value


These errors for example in Dev-C++ are about Compiler Settings. After deleting this lines or change compiler and project settings
I take some linker errors

for example in usbi.h

> undefined reference to 'usb_os_find_busses' like.. etc.

or windows.h, win**.h errors..

my Vusb capacitor was 4.7u and 220 nF. I change these as 10u and 100n.

thanks for your help.

I found a solution. there is a "Compiling a V-USB (AVR-USB) example program with Visual C++" named web page.
I use vusb custom example host "set-led.c" and I use Visual C++ 2010. For linker error messages
I used libusb.lib for Visual C++ 2010 (at lib-usb msvc folder)
Here, my problem solved.

But, now I've got a new problem.

set-led.c gives this message : USB device "Led kontrol " not found with Vid 0x16c0 and pid 0x05df

this mean device is connected but no any data transfer.

thanks for help ???

Do check that the settings in usbconfig.h match your board layout, and that you don't use the mega's internal oscillator by mistake.
There could be a ton of other reasons - just walk through your HW & FW carefully.

I am using atmega8-16PU chip. at wikidot's 'device not recognized errors' page writes that 'p' series chips non-compatible with vusb . is this true ?

my program don't have osccal*, osctune* files.
in the beginning I set clock frequency at AvrStudio's Project options. now I set Cksel fuse bits too. but problem continue.

any suggestion ?