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7 pfowler 1 
#include <avr/io.h>
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#include <avr/interrupt.h>
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#include <avr/wdt.h>
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#include "usbdrv.h"
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#define F_CPU 12000000
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#include <util/delay.h>
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#define USB_LED_OFF 0
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#define USB_LED_ON  1
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int main() {
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    uchar i;
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	DDRD |= (1 << PD6); // PB0 as output
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    wdt_enable(WDTO_1S); // enable 1s watchdog timer
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    usbInit();
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    usbDeviceDisconnect(); // enforce re-enumeration
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    for(i = 0; i<250; i++) { // wait 500 ms
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        wdt_reset(); // keep the watchdog happy
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        _delay_ms(2);
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    }
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    usbDeviceConnect();
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    sei(); // Enable interrupts after re-enumeration
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    while(1) {
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        wdt_reset(); // keep the watchdog happy
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        usbPoll();
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    }
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    return 0;
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}
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// this gets called when custom control message is received
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USB_PUBLIC uchar usbFunctionSetup(uchar data[8]) {
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    usbRequest_t *rq = (void *)data; // cast data to correct type
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    switch(rq->bRequest) { // custom command is in the bRequest field
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    case USB_LED_ON:
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        PORTD |= (1 << PD6); // turn LED on
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        return 0;
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    case USB_LED_OFF:
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        PORTD &= ~(1 << PD6); // turn LED off
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        return 0;
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    }
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    return 0; // should not get here
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}