atmega128IIC

#include <iom128v.h> #include <macros.h> #define uchar unsigned char #define uint unsigned int #define START 0x08 #define RE_START 0x10 #define SLA_W_ACK 0x18 #define SLA_W_NACK 0x20 #define DATA_W_ACK 0x28 #define DATA_W_NACK 0x30 #define SLA_R_ACK 0x40 #define SLA_R_NACK 0x48 #define TM_Start() {TWCR=(1<<TWINT)|(1<<TWSTA)|(1<<TWEN);} #define TM_ReStart() {TWCR=(1<<TWINT)|(1<<TWSTA)|(1<<TWEN);} #define TM_WriteByte() {TWCR=(1<<TWINT)|(1<<TWEN);} #define TM_Stop() {TWCR=(1<<TWINT)|(1<<TWEN)|(1<<TWSTO);} static uchar tab[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f}; uchar *p=tab; volatile uint ct,ct1; volatile uint i,j,k; void delay_us() { for(i=32;i>0;i--){;} } void delay_ms() { for(k=1000;k>0;k--) for(j=1000;j>0;j--){;} } unsigned char IICWriteOne(unsigned char DevSel,unsigned char Addr,unsigned char *Data) { TM_Start(); delay_us(); while(TWCR!=0xA4); if(TWSR!=0x08) { return 0; } TWDR=DevSel&0xFE; TM_WriteByte(); delay_us(); while(TWCR!=0x84); if(TWSR!=0x18) { return 0; } TWDR=Addr; TM_WriteByte(); delay_us(); while(TWCR!=0x84); if(TWSR!=0x28) { return 0; } for(ct=10;ct>0;ct--) { TWDR=*Data; TM_WriteByte(); delay_us(); while(TWCR!=0x84); if(TWSR!=0x28) { return 0; } Data++; } TM_Stop(); return 1; } unsigned char IICReadOne(unsigned char DevSel,unsigned char Addr) { unsigned char retdata; TM_Start(); delay_us(); while(TWCR!=0xA4); if(TWSR!=0x08) { return 0; } TWDR=DevSel&0xFE; TM_WriteByte(); delay_us(); while(TWCR!=0x84); if(TWSR!=0x18) { return 0; } TWDR=Addr; TM_WriteByte(); delay_us(); while(TWCR!=0x84); if(TWSR!=0x28) { return 0; } TM_ReStart(); delay_us(); while(TWCR!=0xA4); if(TWSR!=0x10) { return 0; } TWDR=DevSel|0x01; TM_WriteByte(); delay_us(); while(TWCR!=0x84); if(TWSR!=0x40) { return 0; } // for(ct1=3;ct1>0;ct1--) { TM_WriteByte(); delay_us(); while(TWCR!=0x84); if(TWSR!=0x58) { return 0; } retdata=TWDR; } TM_Stop(); return retdata; } void IICInit(unsigned char rate,unsigned char mul) { TWBR=rate; TWSR&=~0x03; TWSR|=(mul&0x03); } void main() { DDRB=0xff; DDRA=0xff; DDRC=0xff; PORTC=0xfe; IICInit(0x00,0x00); IICWriteOne(0xA2,0x04,tab); delay_ms(); PORTA=IICReadOne(0xA2,0x05); while(1) { ; } }