Mikroelektronika MIKROE-742 데이터 시트

This code demonstrates use of TWI Library procedures and functions. AVR MCU is
connected (SCL, SDA pins ) to 24c02 EEPROM. Program sends data to EEPROM
(data is written at address 2). Then, we read data via TWI from EEPROM and send
its value to PORTA, to check if the cycle was successful. Check the figure below.

program TWI_Simple;

DDRA := 0xFF;        

// configure PORTA as output

TWI_Init(100000);   

// initialize TWI communication

TWI_Start();      

// issue TWI start signal

TWI_Write(0xA2);        // send byte via TWI (device address + W)
TWI_Write(2);           // send byte (address of EEPROM location)

TWI_Write(0xAA);        // send data (data to be written)

TWI_Stop();            // issue TWI stop signal

Delay_100ms();

TWI_Start();     

// issue TWI start signal

TWI_Write(0xA2);    

// send byte via TWI (device address + W)

TWI_Write(2);     

// send byte (data address)

TWI_Start();     

// issue TWI signal repeated start

TWI_Write(0xA3);    

// send byte (device address + R)

PORTA := TWI_Read(0); 

// read data (NO acknowledge)

TWI_Stop();          

// issue TWI stop signal}

Interfacing 24c02 to AVR via TWI

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- SOFTWARE AND HARDWARE SOLUTIONS FOR EMBEDDED WORLD

CHAPTER 6