AVR（M48）的i2c程序，读写at24c02

//ICC-AVR application builder : 2007-12-5 17:34:01 // Target : m48 // Crystal: 1.0000Mhz #include <iom168v.h> #include <macros.h> #include <myfun.h> //#include <I2C.h> #define START 0x08 #define ReSTART 0x10 #define MT_SLA_ACK 0x18 #define MT_DATA_ACK 0x28 #define MR_SLA_ACK 0x40 #define MR_DATA_ACK 0x50 #define MR_DATA_NACK 0x58 #define SLA_W 0xA0 #define SLA_R 0xA1 #define ADDRESS 0x00 #define DATA 0x55 void port_init(void) { //set LED PIN output DDRC |= (1<<DDC3);DDRC |= (1<<DDC2);DDRC |= (1<<DDC1);DDRC |= (1<<DDC0); DDRD |= (1<<DDD7);DDRD |= (1<<DDD6);DDRD |= (1<<DDD5);DDRD |= (1<<DDD4); //set LED off PORTD = 0xF0;PORTC = 0x0F; } void Error() { USART_Transmit(TWSR & 0xF8); while(1) LedBlk(); } //****TWI_ByteW()****// void TWI_ByteW(unsigned char add,unsigned data) { TWCR = (1<<TWINT)|(1<<TWSTA)|(1<<TWEN); //START while(!(TWCR & (1<<TWINT))) //wait for int ; if((TWSR & 0xF8) != START) //check Error(); TWDR = SLA_W; //send SLA_W TWCR = (1<<TWINT) | (1<<TWEN); while(!(TWCR & (1<<TWINT))) //wait for int ; if((TWSR & 0xF8) != MT_SLA_ACK) //check Error(); TWDR = add; //send address TWCR = (1<<TWINT) | (1<<TWEN); while(!(TWCR & (1<<TWINT))) //wait for int ; if((TWSR & 0xF8) != MT_DATA_ACK) //check Error(); TWDR = data; //send data TWCR = (1<<TWINT) | (1<<TWEN); while(!(TWCR & (1<<TWINT))) //wait for int ; if((TWSR & 0xF8) != MT_DATA_ACK) //check Error(); TWCR = (1<<TWINT)|(1<<TWEN)|(1<<TWSTO); //send stop Delayus(150); } //****TWI_CByteR()****// unsigned char TWI_CByteR() { TWCR = (1<<TWINT)|(1<<TWSTA)|(1<<TWEN); //START while(!(TWCR & (1<<TWINT))) //wait for int ; if((TWSR & 0xF8) != START) //check Error(); TWDR = SLA_R; //send SLA_R TWCR = (1<<TWINT) | (1<<TWEN); while(!(TWCR & (1<<TWINT))) //wait for int ; if((TWSR & 0xF8) != MR_SLA_ACK) //check Error(); TWCR = (1<<TWINT) | (1<<TWEN); //receive data while(!(TWCR & (1<<TWINT))) //wait for int ; if((TWSR & 0xF8) != MR_DATA_NACK) //check Error(); TWCR = (1<<TWINT)|(1<<TWEN)|(1<<TWSTO); //send stop return TWDR; } //****TWI_ByteR()****// unsigned char TWI_ByteR(unsigned char add) { TWCR = (1<<TWINT)|(1<<TWSTA)|(1<<TWEN); //START while(!(TWCR & (1<<TWINT))) //wait for int ; if((TWSR & 0xF8) != START) //check Error(); TWDR = SLA_W; //send SLA_W TWCR = (1<<TWINT) | (1<<TWEN); while(!(TWCR & (1<<TWINT))) //wait for int ; if((TWSR & 0xF8) != MT_SLA_ACK) //check Error(); TWDR = add; //send address TWCR = (1<<TWINT) | (1<<TWEN); while(!(TWCR & (1<<TWINT))) //wait for int ; if((TWSR & 0xF8) != MT_DATA_ACK) //check Error(); TWCR = (1<<TWINT)|(1<<TWSTA)|(1<<TWEN); //ReSTART while(!(TWCR & (1<<TWINT))) //wait for int ; if((TWSR & 0xF8) != ReSTART) //check Error(); TWDR = SLA_R; //send SLA_R TWCR = (1<<TWINT) | (1<<TWEN); while(!(TWCR & (1<<TWINT))) //wait for int ; if((TWSR & 0xF8) != MR_SLA_ACK) //check Error(); TWCR = (1<<TWINT) | (1<<TWEN); //receive data while(!(TWCR & (1<<TWINT))) //wait for int ; if((TWSR & 0xF8) != MR_DATA_NACK) //check Error(); TWCR = (1<<TWINT)|(1<<TWEN)|(1<<TWSTO); //send stop return TWDR; } void main(void) { unsigned char data; CLI(); port_init(); USART_Init(); SEI(); TWI_ByteW(0x00,0xA0); TWI_ByteW(0x01,0xA1); TWI_ByteW(0x02,0xA2); TWI_ByteW(0x03,0xA3); TWI_ByteW(0x04,0xA4); TWI_ByteW(0x05,0xA5); TWI_ByteW(0x06,0xA6); TWI_ByteW(0x07,0xA7); TWI_ByteW(0x08,0xA8); TWI_ByteW(0x09,0xA9); USART_Transmit(TWI_ByteR(0x00)); USART_Transmit(TWI_ByteR(0x01)); USART_Transmit(TWI_ByteR(0x02)); USART_Transmit(TWI_ByteR(0x03)); USART_Transmit(TWI_ByteR(0x04)); USART_Transmit(TWI_ByteR(0x05)); USART_Transmit(TWI_ByteR(0x06)); USART_Transmit(TWI_ByteR(0x07)); USART_Transmit(TWI_ByteR(0x08)); USART_Transmit(TWI_ByteR(0x09)); }