srf08 MEGA32 Programmieren in C

[B.Rust]

Ich bin noch der totale Noob und will den srf08 an den Mega 32 anschließen. Ich hab mir nen Beispielprogramm runtergeladen, aber ne fette fehlermeldung:

-------- begin --------
avr-gcc (GCC) 3.3.1
Copyright (C) 2003 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.


Compiling: srf08.c
avr-gcc -c -mmcu=atmega32 -I. -g -Os -funsigned-char -funsigned-bitfields -fpack-struct -fshort-enums -Wall -Wstrict-prototypes -Wa,-adhlns=srf08.lst  -std=gnu99 srf08.c -o srf08.o

Linking: srf08.elf
avr-gcc -mmcu=atmega32 -I. -g -Os -funsigned-char -funsigned-bitfields -fpack-struct -fshort-enums -Wall -Wstrict-prototypes -Wa,-adhlns=srf08.o  -std=gnu99 srf08.o   --output srf08.elf -Wl,-Map=srf08.map,--cref -lm
C:\WinAVR\bin\..\lib\gcc-lib\avr\3.3.1\..\..\..\..\avr\lib\avr5\crtm32.o(.init9+0x0): undefined reference to `main'
srf08.o(.text+0x4): In function `srf08_init':
C:\Dokumente und Einstellungen\blak299321\Desktop\srf08_test_program_for_gcc_and_avr/srf08.c:25: undefined reference to `i2c_init'
srf08.o(.text+0x8):C:\Dokumente und Einstellungen\blak299321\Desktop\srf08_test_program_for_gcc_and_avr/srf08.c:26: undefined reference to `i2c_start'
srf08.o(.text+0x10):C:\Dokumente und Einstellungen\blak299321\Desktop\srf08_test_program_for_gcc_and_avr/srf08.c:26: undefined reference to `i2c_transmit'
srf08.o(.text+0x16):C:\Dokumente und Einstellungen\blak299321\Desktop\srf08_test_program_for_gcc_and_avr/srf08.c:27: undefined reference to `i2c_transmit'
srf08.o(.text+0x1c):C:\Dokumente und Einstellungen\blak299321\Desktop\srf08_test_program_for_gcc_and_avr/srf08.c:28: undefined reference to `i2c_transmit'
srf08.o(.text+0x20):C:\Dokumente und Einstellungen\blak299321\Desktop\srf08_test_program_for_gcc_and_avr/srf08.c:31: undefined reference to `i2c_start'
srf08.o(.text+0x28):C:\Dokumente und Einstellungen\blak299321\Desktop\srf08_test_program_for_gcc_and_avr/srf08.c:32: undefined reference to `i2c_transmit'
srf08.o(.text+0x30):C:\Dokumente und Einstellungen\blak299321\Desktop\srf08_test_program_for_gcc_and_avr/srf08.c:33: undefined reference to `i2c_stop'
srf08.o(.text+0x48): In function `srf08_set_gain':
C:\Dokumente und Einstellungen\blak299321\Desktop\srf08_test_program_for_gcc_and_avr/srf08.c:44: undefined reference to `i2c_start'
srf08.o(.text+0x50):C:\Dokumente und Einstellungen\blak299321\Desktop\srf08_test_program_for_gcc_and_avr/srf08.c:44: undefined reference to `i2c_transmit'
srf08.o(.text+0x56):C:\Dokumente und Einstellungen\blak299321\Desktop\srf08_test_program_for_gcc_and_avr/srf08.c:45: undefined reference to `i2c_transmit'
srf08.o(.text+0x5c):C:\Dokumente und Einstellungen\blak299321\Desktop\srf08_test_program_for_gcc_and_avr/srf08.c:46: undefined reference to `i2c_transmit'
srf08.o(.text+0x60):C:\Dokumente und Einstellungen\blak299321\Desktop\srf08_test_program_for_gcc_and_avr/srf08.c:47: undefined reference to `i2c_stop'
srf08.o(.text+0x82): In function `srf08_set_range':
C:\Dokumente und Einstellungen\blak299321\Desktop\srf08_test_program_for_gcc_and_avr/srf08.c:57: undefined reference to `i2c_start'
srf08.o(.text+0x8a):C:\Dokumente und Einstellungen\blak299321\Desktop\srf08_test_program_for_gcc_and_avr/srf08.c:57: undefined reference to `i2c_transmit'
srf08.o(.text+0x90):C:\Dokumente und Einstellungen\blak299321\Desktop\srf08_test_program_for_gcc_and_avr/srf08.c:58: undefined reference to `i2c_transmit'
srf08.o(.text+0x96):C:\Dokumente und Einstellungen\blak299321\Desktop\srf08_test_program_for_gcc_and_avr/srf08.c:59: undefined reference to `i2c_transmit'
srf08.o(.text+0x9a):C:\Dokumente und Einstellungen\blak299321\Desktop\srf08_test_program_for_gcc_and_avr/srf08.c:60: undefined reference to `i2c_stop'
srf08.o(.text+0xac): In function `srf08_ping':
C:\Dokumente und Einstellungen\blak299321\Desktop\srf08_test_program_for_gcc_and_avr/srf08.c:74: undefined reference to `i2c_start'
srf08.o(.text+0xb4):C:\Dokumente und Einstellungen\blak299321\Desktop\srf08_test_program_for_gcc_and_avr/srf08.c:74: undefined reference to `i2c_transmit'
srf08.o(.text+0xba):C:\Dokumente und Einstellungen\blak299321\Desktop\srf08_test_program_for_gcc_and_avr/srf08.c:75: undefined reference to `i2c_transmit'
srf08.o(.text+0xc0):C:\Dokumente und Einstellungen\blak299321\Desktop\srf08_test_program_for_gcc_and_avr/srf08.c:76: undefined reference to `i2c_transmit'
srf08.o(.text+0xc4):C:\Dokumente und Einstellungen\blak299321\Desktop\srf08_test_program_for_gcc_and_avr/srf08.c:79: undefined reference to `i2c_start'
srf08.o(.text+0xcc):C:\Dokumente und Einstellungen\blak299321\Desktop\srf08_test_program_for_gcc_and_avr/srf08.c:80: undefined reference to `i2c_transmit'
srf08.o(.text+0xd2):C:\Dokumente und Einstellungen\blak299321\Desktop\srf08_test_program_for_gcc_and_avr/srf08.c:81: undefined reference to `i2c_stop'
srf08.o(.text+0xda):C:\Dokumente und Einstellungen\blak299321\Desktop\srf08_test_program_for_gcc_and_avr/srf08.c:85: undefined reference to `i2c_start'
srf08.o(.text+0xe2):C:\Dokumente und Einstellungen\blak299321\Desktop\srf08_test_program_for_gcc_and_avr/srf08.c:85: undefined reference to `i2c_transmit'
srf08.o(.text+0xe8):C:\Dokumente und Einstellungen\blak299321\Desktop\srf08_test_program_for_gcc_and_avr/srf08.c:86: undefined reference to `i2c_transmit'
srf08.o(.text+0xec):C:\Dokumente und Einstellungen\blak299321\Desktop\srf08_test_program_for_gcc_and_avr/srf08.c:87: undefined reference to `i2c_start'
srf08.o(.text+0xf6):C:\Dokumente und Einstellungen\blak299321\Desktop\srf08_test_program_for_gcc_and_avr/srf08.c:87: undefined reference to `i2c_transmit'
srf08.o(.text+0xfc):C:\Dokumente und Einstellungen\blak299321\Desktop\srf08_test_program_for_gcc_and_avr/srf08.c:88: undefined reference to `i2c_receive'
srf08.o(.text+0x104):C:\Dokumente und Einstellungen\blak299321\Desktop\srf08_test_program_for_gcc_and_avr/srf08.c:89: undefined reference to `i2c_receive'
srf08.o(.text+0x10a):C:\Dokumente und Einstellungen\blak299321\Desktop\srf08_test_program_for_gcc_and_avr/srf08.c:90: undefined reference to `i2c_stop'
srf08.o(.text+0x124): In function `srf08_read_register':
C:\Dokumente und Einstellungen\blak299321\Desktop\srf08_test_program_for_gcc_and_avr/srf08.c:104: undefined reference to `i2c_start'
srf08.o(.text+0x12c):C:\Dokumente und Einstellungen\blak299321\Desktop\srf08_test_program_for_gcc_and_avr/srf08.c:104: undefined reference to `i2c_transmit'
srf08.o(.text+0x132):C:\Dokumente und Einstellungen\blak299321\Desktop\srf08_test_program_for_gcc_and_avr/srf08.c:105: undefined reference to `i2c_transmit'
srf08.o(.text+0x136):C:\Dokumente und Einstellungen\blak299321\Desktop\srf08_test_program_for_gcc_and_avr/srf08.c:106: undefined reference to `i2c_start'
srf08.o(.text+0x140):C:\Dokumente und Einstellungen\blak299321\Desktop\srf08_test_program_for_gcc_and_avr/srf08.c:106: undefined reference to `i2c_transmit'
srf08.o(.text+0x14a):C:\Dokumente und Einstellungen\blak299321\Desktop\srf08_test_program_for_gcc_and_avr/srf08.c:109: undefined reference to `i2c_receive'
srf08.o(.text+0x152):C:\Dokumente und Einstellungen\blak299321\Desktop\srf08_test_program_for_gcc_and_avr/srf08.c:112: undefined reference to `i2c_receive'
srf08.o(.text+0x158):C:\Dokumente und Einstellungen\blak299321\Desktop\srf08_test_program_for_gcc_and_avr/srf08.c:114: undefined reference to `i2c_stop'
srf08.o(.text+0x16a): In function `srf08_change_i2c_address':
C:\Dokumente und Einstellungen\blak299321\Desktop\srf08_test_program_for_gcc_and_avr/srf08.c:125: undefined reference to `i2c_start'
srf08.o(.text+0x172):C:\Dokumente und Einstellungen\blak299321\Desktop\srf08_test_program_for_gcc_and_avr/srf08.c:125: undefined reference to `i2c_transmit'
srf08.o(.text+0x178):C:\Dokumente und Einstellungen\blak299321\Desktop\srf08_test_program_for_gcc_and_avr/srf08.c:126: undefined reference to `i2c_transmit'
srf08.o(.text+0x17e):C:\Dokumente und Einstellungen\blak299321\Desktop\srf08_test_program_for_gcc_and_avr/srf08.c:127: undefined reference to `i2c_transmit'
srf08.o(.text+0x182):C:\Dokumente und Einstellungen\blak299321\Desktop\srf08_test_program_for_gcc_and_avr/srf08.c:128: undefined reference to `i2c_stop'
srf08.o(.text+0x186):C:\Dokumente und Einstellungen\blak299321\Desktop\srf08_test_program_for_gcc_and_avr/srf08.c:130: undefined reference to `i2c_start'
srf08.o(.text+0x18e):C:\Dokumente und Einstellungen\blak299321\Desktop\srf08_test_program_for_gcc_and_avr/srf08.c:130: undefined reference to `i2c_transmit'
srf08.o(.text+0x194):C:\Dokumente und Einstellungen\blak299321\Desktop\srf08_test_program_for_gcc_and_avr/srf08.c:131: undefined reference to `i2c_transmit'
srf08.o(.text+0x19a):C:\Dokumente und Einstellungen\blak299321\Desktop\srf08_test_program_for_gcc_and_avr/srf08.c:132: undefined reference to `i2c_transmit'
srf08.o(.text+0x19e):C:\Dokumente und Einstellungen\blak299321\Desktop\srf08_test_program_for_gcc_and_avr/srf08.c:133: undefined reference to `i2c_stop'
srf08.o(.text+0x1a2):C:\Dokumente und Einstellungen\blak299321\Desktop\srf08_test_program_for_gcc_and_avr/srf08.c:135: undefined reference to `i2c_start'
srf08.o(.text+0x1aa):C:\Dokumente und Einstellungen\blak299321\Desktop\srf08_test_program_for_gcc_and_avr/srf08.c:135: undefined reference to `i2c_transmit'
srf08.o(.text+0x1b0):C:\Dokumente und Einstellungen\blak299321\Desktop\srf08_test_program_for_gcc_and_avr/srf08.c:136: undefined reference to `i2c_transmit'
srf08.o(.text+0x1b6):C:\Dokumente und Einstellungen\blak299321\Desktop\srf08_test_program_for_gcc_and_avr/srf08.c:137: undefined reference to `i2c_transmit'
srf08.o(.text+0x1ba):C:\Dokumente und Einstellungen\blak299321\Desktop\srf08_test_program_for_gcc_and_avr/srf08.c:138: undefined reference to `i2c_stop'
srf08.o(.text+0x1be):C:\Dokumente und Einstellungen\blak299321\Desktop\srf08_test_program_for_gcc_and_avr/srf08.c:140: undefined reference to `i2c_start'
srf08.o(.text+0x1c6):C:\Dokumente und Einstellungen\blak299321\Desktop\srf08_test_program_for_gcc_and_avr/srf08.c:140: undefined reference to `i2c_transmit'
srf08.o(.text+0x1cc):C:\Dokumente und Einstellungen\blak299321\Desktop\srf08_test_program_for_gcc_and_avr/srf08.c:141: undefined reference to `i2c_transmit'
srf08.o(.text+0x1d2):C:\Dokumente und Einstellungen\blak299321\Desktop\srf08_test_program_for_gcc_and_avr/srf08.c:142: undefined reference to `i2c_transmit'
srf08.o(.text+0x1d6):C:\Dokumente und Einstellungen\blak299321\Desktop\srf08_test_program_for_gcc_and_avr/srf08.c:143: undefined reference to `i2c_stop'
make : *** [srf08.elf] Error 1

> Process Exit Code: 2