I²C LCD mit ATmega8

[HannoHupmann]

@MartinFunk kleiner Tipp, skalier die Bilder bevor du sie online stellst. Wenn es nicht gerade Detail sein müssen dann reicht leicht eine Auflösung von 800x600 und man kann sie sich schneller anschauen.

[MartinFunk]

OK werd ich machen!

Martin

[MartinFunk]

Hi,
kann mir jemand helfen die I2C adresse ins EEPROM zu schreiben.

Hier noch mein code:

#include <avr/io.h>
#include <avr/interrupt.h>
#include <avr/eeprom.h>
#include <inttypes.h>
#include "lcd.c"
#include "TWI_Slave.c"

#define F_CPU 8000000UL
// Sample TWI transmission commands
#define LCD_PUTC 			 0x50
#define LCD_GOTOXY 			 0x51
#define LCD_CLEAR 			 0x52
#define LCD_GOHOME 			 0x53
#define LCD_LIGHT 			 0x54

//#define EEMEM __attribute__ ((section (".eeprom"))) 

unsigned char TWI_Act_On_Failure_In_Last_Transmission ( unsigned char TWIerrorMsg )
{
  PORTB = TWIerrorMsg;
  TWI_Start_Transceiver();
                    
  return TWIerrorMsg; 
}

void init_timer2 (void)
{
	cli();									// Interrupts sperren! 
	ASSR &= ~(1<<AS2);
	TCCR2 |= (1<<CS21) | (1<<CS22);	//Timer 2 auf CLK/1024 setzen
	OCR2 = 255;		// Output Compare
	TCNT2=	0x00;		// Timer2 auf 0 stellen
	TIMSK |= (1<<OCIE2) | (1<<TOIE2);	// Timer2 Output Compare Interrupt Enable aktivieren  (Bit setzen) //
	sei();									// Interrrupts freigeben!
}

SIGNAL(SIG_OUTPUT_COMPARE2)
{
	char cSREG;
	cSREG = SREG; // Statusregister puffern in Variable cSREG //
		PORTD &= ~(1<<4);
	SREG = cSREG; 	// Statusregister aus Variable cSREG retten //
}
SIGNAL(SIG_OVERFLOW2)
{
	char cSREG;
 	cSREG = SREG; // Statusregister puffern in Variable cSREG //
		PORTD |= (1<<4);
 	SREG = cSREG; 	// Statusregister aus Variable cSREG retten //
}

int main( void )
{
  unsigned char messageBuf[3];
  unsigned char  TWI_slaveAddress = 0x60 ;
  uint32_t loop = 0;
  //uint8_t eeFooByte = 0x01;
  //uint8_t eeFooByte1 = 0x02;
  
	// timer init
	init_timer2();

  

  DDRD  = 0xFF; // Set to ouput
  DDRB  = 0x00; // Set to input
  DDRC  = 0x00; // Set to input
  PORTB = 0xff;	//activate pullup's
  PORTC = 0xff;	//activate pullup's

	// Own TWI slave address

  TWI_slaveAddress     = 0x60;       //eeprom_read_byte(&eeFooByte);

  // Initialise TWI module for slave operation. Include address and/or enable General Call.
  TWI_Slave_Initialise( TWI_slaveAddress); 
                                                                                  
  sei();

  // Start the TWI transceiver to enable reseption of the first command from the TWI Master.
  TWI_Start_Transceiver();
	
	//LCD_init
	lcd_init(LCD_DISP_ON);
	lcd_clrscr();
	lcd_home();
	lcd_puts("I2C_LCD by\nMartin Funk V1.1");

	while (loop < 500000) loop++;
	
	lcd_clrscr();
	lcd_home();
	lcd_puts("martin.roboter\nbastler.de  V1.1");

	loop = 0;
	while (loop < 500000) loop++;
	lcd_clrscr();
	lcd_home();

	OCR2 = 0;
	
  // This loop runs forever. If the TWI is busy the execution will just continue doing other operations.
  while(1)
  {    
    // Check if the TWI Transceiver has completed an operation.
    if ( ! TWI_Transceiver_Busy() )                              
    {
    // Check if the last operation was successful
      if ( TWI_statusReg.lastTransOK )
      {
    // Check if the last operation was a reception
        if ( TWI_statusReg.RxDataInBuf )
        {
          TWI_Get_Data_From_Transceiver(messageBuf ,3);         
    // Check if the last operation was a reception as General Call        
          if ( !TWI_statusReg.genAddressCall )
          
          {
    // Take action dependant on what slave address that was used in the message
            //if (messageBuf[0] == TWI_slaveAddress)
           // {
			//clear Display
              if (messageBuf[0] == LCD_CLEAR)	//lcd löschen
			  	{
                 lcd_clrscr();                          
				 }
       		  if (messageBuf[0] == LCD_GOTOXY) //lcd gotoxy
			  	{
                 lcd_gotoxy(messageBuf[1],messageBuf[2]);;                          
				 }
              if (messageBuf[0] == LCD_PUTC) //lcd put char
              {
                lcd_putc(messageBuf[1]);

              }
			  if (messageBuf[0] == LCD_GOHOME) //lcd put char
              {
                lcd_home();

              }
			  if (messageBuf[0] == LCD_LIGHT) //lcd put char
              {
			  	OCR2 = messageBuf[1];
              }
          }
        }
    // Check if the TWI Transceiver has already been started.
    // If not then restart it to prepare it for new receptions.             
        if ( ! TWI_Transceiver_Busy() )
        {
          TWI_Start_Transceiver();
        }      
      }
    // Ends up here if the last operation completed unsuccessfully
      else
      {
        TWI_Act_On_Failure_In_Last_Transmission( TWI_Get_State_Info() );
      }
      
    }
  }
}

Mfg Martin