Druckbare Version
lol habe kein problem verstehe das nur net so ganz das da bei 116 74 raus kommen habe ich im buch gesehen aber das mit dem binär *gg* ist ja auch egal ich schreibe mal connrad an und sage das das lcd nicht ansprechbar ist mit der adresse und das ich denke das es kaputt ist und lasse mir ein neues schicken. Das einzigste wäre noch die test hex von m.a.r.v.i.n zu ändern mit meiner adresse und noch mal zu probieren
na mach das doch... =)
umrechnung von dezimal in binär und hex erklär ich dir irgend wann mal im icq
ok danke. =) "das ist mal wieder das ich die 15 zeichen zusammen bekomme^^"
so habe es geändert aber die status led ist immer noch rot und es kommen einser. jetzt habe ich mal I2CMASTER.H auf gemacht kann es vllt sein das es daran ligt das die code darin falsch sind???
also folgene änderung habe ich gemacht so sah die alte i2cmaster.h aus
und so sieht meine aus änderung ausCode:#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
**************************************************************************/
#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
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
**************************************************************************/
#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 0x74 // device address of 0x74, see datasheet
int main(void)
{
unsigned char ret;
i2c_init(); // initialize I2C library
// write 0x75 to EEPROM address 5 (Byte Write)
i2c_start_wait(0x74+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(0x74+I2C_WRITE); // set device address and write mode
i2c_write(0x05); // write address = 5
i2c_rep_start(0x74+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
naja so habe ich die lib auch angepasst bei dem code im ersten post...
jetzt läuft der Test von m.a.r.v.i.n die status LED wird grün und er zählt 1.2.23.4.5.6.7.8.... weiss ja nicht ob das so richtig ist
jetzt das
i2c_write(0x05); // write address = 5
im daten blatt von mir
010xxxxxx1 weiss aber nicht was das für ne zahl ist vllt 0x01?
In der i2cmaster.h Datei braucht man überhaupt nichts ändern. Die Änderung die du dort gemacht hast, betrifft doch nur das Beispiel, das für die doxygen Dokumentation verwendet wird. Am erzeugten Code ändert das gar nichts, weil dieser Bereich als Kommentar angesehen wird.
In der i2cmaster.S Datei wird eingestellt, welche Ports man für den I2C Bus verwendet.
Die Device Adresse und den Programmcode ändert man nur in der test_i2cmaster.c Datei.Code:;***** Adapt these SCA and SCL port and pin definition to your target !!
;
#define SDA 3 // SDA Port C, Pin 3 ADC3
#define SCL 2 // SCL Port C, Pin 2 ADC2
#define SDA_PORT PORTC // SDA Port C
#define SCL_PORT PORTC // SCL Port C
ah ja da habe ich es auch geändert stimmt
edit: m.a.r.v.i.n hat vollkommen recht habe die h wieder überschrieben mit der die ich geändert habe jetzt funktionierts immer noch
ok, kurzes umrechnungs-howto:
im datenblatt stehen 9stellige zahlen. die letzte stelle, ACK, wird ignoriert. bleiben 8 stellen.
beispiel:
01101101
diese zahl teilst du in zwei hälften:
0110 1101
jetzt nimmst du die erste hälfte: 0110
von RECHTS NACH LINKS ist der wert der ziffern
1,2,4,8
alo rechnest du jetzt von rechts nach links:
0*1 + 1*2 + 1*4 + 0*8
also (ziffer an der stelle)*(wert der stelle)
0*1 + 1*2 + 1*4 + 0*8 = 6
diese 6 merkst du dir.
zweite hälfte: 1101
von rechts nach links:
1*1+0*2+1*4+1*8=13
jetzt hast du zwei zahlen:
6 13
das musst du jetzt nur noch umrechnen in folgendem muster:
0->0
1->1
...
8->8
9->9
10->A
11->B
12->C
13->D
14->E
15->F
also schreibst du anstatt 6 13 jetzt 6D. damit der compiler die zahl versteht, schreibst du noch 0x davor. das bedeutet also nur "dies ist eine hexzahl"
binäre zahl -> hexzahl
01101101 -> 6D
noch ein beispiel: die adresse ds displays.
01110100
zwei hälften:
0111 0100
erste hälfte:
1*1+1*2+1*4+0*8=7
zweite hälfte:
0*1+0*2+1*4+0*8=4
also ist die hex-zahl 0x74
wenn im datenblatt an einer bitstelle ein X steht, dann ist es egal was hier übertragen wird. vorzugsweise eine null, ist leicher zu rechnen.
also für dein beispiel 010xxxxx1:
die eins am ende fällt weg. übertragen wird 01000000
zwei hälften: 0100 0000
erste hälfte: 0*1+0*2+1*4+0*8=4
zweite hälfte: 0*1+0*2+0*4+0*8=0
zusammen:0x40
mehr ist es nicht...
such doch im google hex to binary oder so ^^.
Also jetzt geht das teil doch ^^. Du kannst jetzt mit dem programmierung anfangen, viel spaß