USB PIC

[coin]

Hi I need to send data to USB PIC16c745 this is my c code.

int main(){
        struct usbdevfs_bulktransfer bulk;
        int fd;
        int ret,*data,dato=0xFF;
        data=&dato;
        fd = open("/proc/bus/usb/002/003", O_RDWR);
        if(fd != -1) {
                bulk.ep = 1;
                bulk.len = 1024;
                bulk.data = data;
                bulk.timeout = 1000;
                ret = ioctl(fd, USBDEVFS_BULK, &bulk);
                perror("ioctl");
                if (ret < 0)
                        printf("Error in bulk transfer\n");
                /*else {
                
                }*/
                close(fd);
        } 
        return 0;
}

But it send to me a ioctl device or resource busy. I try too with libusb: 

usb_interrupt_write(udev,1,byte,8,10)

but i got the same message device or resource busy. In win98 I can
send data to USB PIC16745 with the same firmware. I got the firmware
and control OCX in this page
http://www.alecmcnamara.freeserve.co.uk/piccalc/.

But I need to make it on GNU/Linux.

Thank you