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Include -Frage
Bin hier grad am rumwerkeln mit der i²C-lib von peter fleury ...
Folgendes "Problem": Ich muss auch die twimaster.c im main-file includen es reicht nicht aus sie in der i2cmaster.h zu includen... (sollte aber oder ?)
mein main-file sieht atm so aus:
Code:
#include <avr/io.h>
#include "i2cmaster.h"
#include "twimaster.c"
int main(void)
{
i2c_init(); // initialize I2C library
return 0;
}
die i2cmaster.h sieht so:
Code:
#ifndef _I2CMASTER_H
#define _I2CMASTER_H 1
/*************************************************************************
* Title: C include file for the I2C master interface
* (i2cmaster.S or twimaster.c)
* Author: Peter Fleury <pfleury@gmx.ch> http://jump.to/fleury
* File: $Id: i2cmaster.h,v 1.10 2005/03/06 22:39:57 Peter Exp $
* Software: AVR-GCC 3.4.3 / avr-libc 1.2.3
* Target: any AVR device
* Usage: see Doxygen manual
**************************************************************************/
#include "twimaster.c"
#include "inexistent.test"
#ifdef DOXYGEN
.....
Wird brav compiliert, kein fehler, dass die inexistent.test nicht gefunden werden kann... (auch an diversen stellen probiert =( )
Lass ich aber im main-file folgenden include weg:
Code:
#include "twimaster.c"
kommt dieser fehler
Code:
../amsel.c:7: undefined reference to `i2c_init'
EIgentlich müsste ich die twimaster.c nicht includen oder :?: :?: :?:
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Hi,
also eine .c-Datei includiert man nie. Alle c-Dateien werden kompiliert und danach zusammengelinkt. Dein Problem ist, dass du anscheinend die twimaster.c nicht kompilierst oder sie am Ende nicht mit gelinkt wird .. deshalb gibt dein Compiler den Fehler "undefined reference", er weiß also, dass es 'i2c_init' gibt (aus deiner header-Datei), aber weiß nicht, was es ist.
Habe das ganze vereinfacht und nicht einwandfrei geschrieben, Grundprinzip sollte verdeutlicht werden ..
Viele Grüße
CsT
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Genau so wie CsT geschrieben hat, füge Deine *.c Datei in Makefile ein und zwar in diese Zeile:
ein Leerzeichen setzen und twimaster.c dazuschreiben.
Es könnte auch solche Zeile stehen
dann kommt sie dahin.
Jetzt sollte sie gefunden, kompiliert und gelinkt werden :-)
Gruß Sebastian
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AVRStudio überschriebt das Makefile knallhart. Ich könnte das zwar deaktivieren, aber da muss es doch ne andere Lösung geben ...
Ich include doch die: #include "i2cmaster.h"
und darin wird wiederum die: #include "twimaster.c"
included... warum funzt das nicht ?
Hier nochmal die ganze i2cmaster.h
Code:
#ifndef _I2CMASTER_H
#define _I2CMASTER_H 1
/*************************************************************************
* Title: C include file for the I2C master interface
* (i2cmaster.S or twimaster.c)
* Author: Peter Fleury <pfleury@gmx.ch> http://jump.to/fleury
* File: $Id: i2cmaster.h,v 1.10 2005/03/06 22:39:57 Peter Exp $
* Software: AVR-GCC 3.4.3 / avr-libc 1.2.3
* Target: any AVR device
* Usage: see Doxygen manual
**************************************************************************/
#include "twimaster.c"
#ifdef DOXYGEN
/**
@defgroup pfleury_ic2master I2C Master library
@code #include <i2cmaster.h> @endcode
@brief I2C (TWI) Master Software Library
Basic routines for communicating with I2C slave devices. This single master
implementation is limited to one bus master on the I2C bus.
This I2c library is implemented as a compact assembler software implementation of the I2C protocol
which runs on any AVR (i2cmaster.S) and as a TWI hardware interface for all AVR with built-in TWI hardware (twimaster.c).
Since the API for these two implementations is exactly the same, an application can be linked either against the
software I2C implementation or the hardware I2C implementation.
Use 4.7k pull-up resistor on the SDA and SCL pin.
Adapt the SCL and SDA port and pin definitions and eventually the delay routine in the module
i2cmaster.S to your target when using the software I2C implementation !
Adjust the CPU clock frequence F_CPU in twimaster.c or in the Makfile when using the TWI hardware implementaion.
@note
The module i2cmaster.S is based on the Atmel Application Note AVR300, corrected and adapted
to GNU assembler and AVR-GCC C call interface.
Replaced the incorrect quarter period delays found in AVR300 with
half period delays.
@author Peter Fleury pfleury@gmx.ch http://jump.to/fleury
@par API Usage Example
The following code shows typical usage of this library, see example test_i2cmaster.c
@code
#include <i2cmaster.h>
#define Dev24C02 0xA2 // device address of EEPROM 24C02, see datasheet
int main(void)
{
unsigned char ret;
i2c_init(); // initialize I2C library
// write 0x75 to EEPROM address 5 (Byte Write)
i2c_start_wait(Dev24C02+I2C_WRITE); // set device address and write mode
i2c_write(0x05); // write address = 5
i2c_write(0x75); // write value 0x75 to EEPROM
i2c_stop(); // set stop conditon = release bus
// read previously written value back from EEPROM address 5
i2c_start_wait(Dev24C02+I2C_WRITE); // set device address and write mode
i2c_write(0x05); // write address = 5
i2c_rep_start(Dev24C02+I2C_READ); // set device address and read mode
ret = i2c_readNak(); // read one byte from EEPROM
i2c_stop();
for(;;);
}
@endcode
*/
#endif /* DOXYGEN */
/**@{*/
#if (__GNUC__ * 100 + __GNUC_MINOR__) < 304
#error "This library requires AVR-GCC 3.4 or later, update to newer AVR-GCC compiler !"
#endif
#include <avr/io.h>
/** defines the data direction (reading from I2C device) in i2c_start(),i2c_rep_start() */
#define I2C_READ 1
/** defines the data direction (writing to I2C device) in i2c_start(),i2c_rep_start() */
#define I2C_WRITE 0
/**
@brief initialize the I2C master interace. Need to be called only once
@param void
@return none
*/
extern void i2c_init(void);
/**
@brief Terminates the data transfer and releases the I2C bus
@param void
@return none
*/
extern void i2c_stop(void);
/**
@brief Issues a start condition and sends address and transfer direction
@param addr address and transfer direction of I2C device
@retval 0 device accessible
@retval 1 failed to access device
*/
extern unsigned char i2c_start(unsigned char addr);
/**
@brief Issues a repeated start condition and sends address and transfer direction
@param addr address and transfer direction of I2C device
@retval 0 device accessible
@retval 1 failed to access device
*/
extern unsigned char i2c_rep_start(unsigned char addr);
/**
@brief Issues a start condition and sends address and transfer direction
If device is busy, use ack polling to wait until device ready
@param addr address and transfer direction of I2C device
@return none
*/
extern void i2c_start_wait(unsigned char addr);
/**
@brief Send one byte to I2C device
@param data byte to be transfered
@retval 0 write successful
@retval 1 write failed
*/
extern unsigned char i2c_write(unsigned char data);
/**
@brief read one byte from the I2C device, request more data from device
@return byte read from I2C device
*/
extern unsigned char i2c_readAck(void);
/**
@brief read one byte from the I2C device, read is followed by a stop condition
@return byte read from I2C device
*/
extern unsigned char i2c_readNak(void);
/**
@brief read one byte from the I2C device
Implemented as a macro, which calls either i2c_readAck or i2c_readNak
@param ack 1 send ack, request more data from device
0 send nak, read is followed by a stop condition
@return byte read from I2C device
*/
extern unsigned char i2c_read(unsigned char ack);
#define i2c_read(ack) (ack) ? i2c_readAck() : i2c_readNak();
/**@}*/
#endif
#####################
lol.. jetzt funzts \:D/
Einfach nur 3-4 mal absoult das selbe probieren 1-2 mal AVRStudio/Windows neustarten und schon hat sichs von selbst gelöst...
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Naja .. das optimale wirds wohl nicht sein, wie oben schon gesagt, includiert man keine Quellcode-Dateien, diese werden mit kompiliert und das wird im Makefile festgelegt. Du musst AVRStudio wohl beibringen, diese i2cmaster.c mit in das Projekt einzufügen, wie auch immer.
Viele Grüße
CsT
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hi,
du musst in AVR studio in dem linken fenster bei "source files" rechtsklicken und da source file hinzufügen dann gehts.
Martin
