PCF8591 co jest nie tak?

Witam.

W poniższym fragmencie programu chyba coś jest nie tak bo odczytuję ciągle 255. A1, A2, A3 mam zwarte do masy:

/***************************************************** This program was produced by the CodeWizardAVR

Chip type : ATmega8515 Program type : Application Clock frequency : 7,372800 MHz Memory model : Small External SRAM size : 0 Data Stack size : 128

#include <mega8515.h>

#include <delay.h>

// Standard Input/Output functions #include <stdio.h>

// I2C Bus functions #asm .equ __i2c_port=0x07 ;PORTE .equ __sda_bit=0 .equ __scl_bit=1 #endasm #include <i2c.h>

// Declare your global variables here char k; unsigned char ch; void main(void) { // Declare your local variables here

// Input/Output Ports initialization // Port A initialization // Func7=Out Func6=Out Func5=Out Func4=Out Func3=Out Func2=Out Func1=Out Func0=Out // State7=0 State6=0 State5=0 State4=0 State3=0 State2=0 State1=0 State0=0 PORTA=0x00; DDRA=0xFF;

// Port B initialization // Func7=Out Func6=Out Func5=Out Func4=Out Func3=Out Func2=Out Func1=Out Func0=Out // State7=0 State6=0 State5=0 State4=0 State3=0 State2=0 State1=0 State0=0 PORTB=0x00; DDRB=0xFF;

// Port C initialization // Func7=In Func6=In Func5=In Func4=In Func3=In Func2=In Func1=In Func0=In // State7=T State6=T State5=T State4=T State3=T State2=T State1=T State0=T PORTC=0x00; DDRC=0x00;

// Port D initialization // Func7=In Func6=In Func5=In Func4=In Func3=In Func2=In Func1=In Func0=In // State7=T State6=T State5=T State4=T State3=T State2=T State1=T State0=T PORTD=0x00; DDRD=0x00;

// Port E initialization // Func2=In Func1=In Func0=In // State2=T State1=T State0=T PORTE=0x00; DDRE=0x00;

// Timer/Counter 0 initialization // Clock source: System Clock // Clock value: Timer 0 Stopped // Mode: Normal top=FFh // OC0 output: Disconnected TCCR0=0x00; TCNT0=0x00; OCR0=0x00;

// Timer/Counter 1 initialization // Clock source: System Clock // Clock value: Timer 1 Stopped // Mode: Normal top=FFFFh // OC1A output: Discon. // OC1B output: Discon. // Noise Canceler: Off // Input Capture on Falling Edge // Timer 1 Overflow Interrupt: Off // Input Capture Interrupt: Off // Compare A Match Interrupt: Off // Compare B Match Interrupt: Off TCCR1A=0x00; TCCR1B=0x00; TCNT1H=0x00; TCNT1L=0x00; ICR1H=0x00; ICR1L=0x00; OCR1AH=0x00; OCR1AL=0x00; OCR1BH=0x00; OCR1BL=0x00;

// External Interrupt(s) initialization // INT0: Off // INT1: Off // INT2: Off MCUCR=0x00; EMCUCR=0x00;

// Timer(s)/Counter(s) Interrupt(s) initialization TIMSK=0x00;

// USART initialization // Communication Parameters: 8 Data, 1 Stop, No Parity // USART Receiver: On // USART Transmitter: On // USART Mode: Asynchronous // USART Baud rate: 9600 UCSRA=0x00; UCSRB=0x18; UCSRC=0x86; UBRRH=0x00; UBRRL=0x2F;

// Analog Comparator initialization // Analog Comparator: Off // Analog Comparator Input Capture by Timer/Counter 1: Off ACSR=0x80; i2c_init(); while (1) { /* receive the character */ k=getchar(); /* and echo it back */ i2c_start(); i2c_write(0x90); i2c_write(0x40); i2c_stop(); i2c_start(); i2c_write(0x91); ch=i2c_read(0); i2c_stop();

PORTA=~k; putchar(ch); PORTB=0; delay_ms(1000); PORTB=255; delay_ms(1000);

}; }