Undefined reference to `usbInit' in C AVR - linker

Question

I use v-usb library for my project.
I wrote code and i want compile it, but unfortunately I have an error which I'm unable to resolve.
Here is my screen-shot:
Description Resource Path Location Type
make: *** [USB_module.elf] Error 1 USB_module C/C++ Problem
undefined reference to `usbInit' main.c /USB_module C/C++ Problem
undefined reference to `usbMsgPtr' main.c /USB_module C/C++ Problem
undefined reference to `usbPoll' main.c /USB_module C/C++ Problem
This situation is for me strange because i have in header this:
#include "usbconfig.h"
#include "usbdrv/usbdrv.h"
#include "usbdrv/oddebug.h"
And usbdrv/usbdrv.h defines the USBpoll function:
Shouldn't the compiler be able to compile it?
Here is my project: http://goo.gl/P6ujK
And here is my entire workspace directory: http://minus.com/mbhTkJuvOK#1
Here is my code: main.c:
/*
* main.c
*
* Created on: 25-01-2012
* Author: Bordeux
*/
#define F_CPU 12000000
#include <avr/io.h>
#include <avr/interrupt.h>
#include <avr/pgmspace.h>
#include <avr/wdt.h>
#include "usbconfig.h"
#include "usbdrv/usbdrv.h"
#include "usbdrv/oddebug.h"
#define DDS1_SDA (1<<1) //PORTB1
#define DDS_SCL (1<<3) //PORTB3
#define DDS_UPDATE (1<<4) //PORTB4
static uchar usb_val;
USB_PUBLIC uchar usbFunctionWrite(uchar *data, uchar len) //sends len bytes to DDS_SDA
{
uchar i;
uchar b;
uchar adr=0;
while (len!=0)
{
b=1;
for (i=0; i<8; i++)
{
if (b & data[adr])
{
PORTB = (PORTB | DDS1_SDA) & ~DDS_SCL;
PORTB = PORTB | DDS_SCL;
}
else
{
PORTB = PORTB & (~DDS1_SDA & ~DDS_SCL);
PORTB = PORTB | DDS_SCL;
}
b=b<<1;
}
len--;
adr++;
}
if (usb_val)
{
PORTB = PORTB | DDS_UPDATE;// update DDS
PORTB = PORTB & ~DDS_UPDATE;
}
return 1;
}
USB_PUBLIC uchar usbFunctionSetup(uchar data[8])
{
usbRequest_t *rq = (void *)data;
static uchar replyBuf[3];
usbMsgPtr = replyBuf;
if(rq->bRequest == 0) // ECHO value
{
replyBuf[0] = data[2]; // rq->bRequest identical data[1]!
replyBuf[1] = data[3];
return 2;
}
if(rq->bRequest == 1) // set port directions
{
// DDRA = data[2];
DDRB = data[3];
DDRD = data[4] & (~USBMASK & ~(1 << 2)); // protect USB interface
return 0;
}
if(rq->bRequest == 2) // read ports
{
// replyBuf[0] = PINA;
replyBuf[1] = PINB;
replyBuf[2] = PIND;
return 3;
}
if(rq->bRequest == 3) // read port states
{
// replyBuf[0] = PORTA;
replyBuf[1] = PORTB;
replyBuf[2] = PORTD;
return 3;
}
if(rq->bRequest == 4) // set ports
{
// PORTA = data[2];
PORTB = data[3];
PORTD = data[4];
return 0;
}
if(rq->bRequest == 5) // use usbFunctionWrite to transfer len bytes to DDS
{
usb_val = data[2]; // usb_val!=0 => DDS update pulse after data transfer
return 0xff;
}
if(rq->bRequest == 6)
{
PORTB = PORTB | DDS_UPDATE; // issue update pulse to DDS
PORTB = PORTB & ~DDS_UPDATE;
return 0;
}
replyBuf[0] = 0xff; // return value 0xff => command not supported
return 1;
}
int main(void)
{
wdt_enable(WDTO_1S); // set Watchdog Timer
odDebugInit();
PORTB=0xe0; // Set PortB 0-4 zero
DDRB=0x1f; // Set PORTB 0-4 output
PORTD = 0; /* no pullups on USB pins */
DDRD = ~USBMASK & ~(1 << 2); /* all outputs except USB data and PD2 = INT0 */
usbInit();
sei();
for(;;) /* main event loop */
{
wdt_reset(); // restart watchdog timer
usbPoll();
}
return 0;
}

Answer 1

solution:
mv usbdrv.c usbdrv.cpp
or compile with avr-g++

Answer 2

You need to link against whatever file supplies usbInit etc., from the looks of your screen shots you've shown the file usbdrv.c, but not actually compiled/linked it into your project. Only usbdrv.h is showing in the tree view.
#includeing the header file shows the compiler the declaration of the function, you need to make sure it sees the definition somewhere too.

Answer 3

you could also have included usbdrv.h in extern "C":
extern "C" {
#include "usbdrv.h";
}