原创 ATMEGA16批量读写24C256

#include 
#include 
#include 

typedef unsigned char uchar;
typedef unsigned int uint;

#define EEPROM_BUS_ADDRESS 0xa0
#define TW_START        0X08
#define TW_MT_SLA_ACK   0X18
#define TW_MT_SLA_NACK  0X20
#define TW_MT_DATA_ACK  0X28
#define TW_MT_DATA_NACK 0X30
#define TW_MT_ARB_LOST  0X38

#define TW_MR_ARB_LOST  0X38
#define TW_MR_SLA_ACK   0X40
#define TW_MR_SLA_NACK  0X48
#define TW_MR_DATA_ACK  0X50
#define TW_MR_DATA_NACK 0X38
// Declare your global variables here
#define Page_size 64
#define Page_mask Page_size-1

void I2C_init(void)
{
    TWSR=0;
    TWBR=0;
    TWAR=0;
    TWCR=0X44;
    
}

uchar I2C_start(void)
{
    TWCR=(1<1<1<while(!(TWCR&(1<return 1;
}
void I2C_stop(void)
{
    TWCR=(1<1<1<uchar I2C_write(uchar c)
{
    uchar ack=1;
    TWDR=c;
    TWCR=(1<1<while(!(TWCR&(1<if((TWSR&0xf8)!=TW_MT_SLA_ACK)
        ack=0;
    return ack;
}
uchar I2C_read(uchar ack)
{
    if(ack)
        TWCR=(1<1<1<else
        TWCR=(1<1<while(!(TWCR&(1<return(TWDR);
}
void EEprom_Page_write(uint Addr,uchar n,uchar* arr)
{
    uchar i;
    I2C_start();
    I2C_write(EEPROM_BUS_ADDRESS);
    I2C_write(Addr>>8);
    I2C_write(Addr);
    for(i=1;i<=n;i++)
    {
        I2C_write(*arr);
        arr++;
    }
    I2C_stop();
    delay_ms(10);
}
void EEprom_write(uint Addr,uchar n,uchar* arr)
{
    uchar n_tmp;
    n_tmp=Page_size-(uchar)(Addr&Page_mask);
    if((n>n_tmp)&&(n_tmp!=0))
    {
        EEprom_Page_write(Addr,n_tmp,arr);
        Addr+=n_tmp;
        n-=n_tmp;
        arr+=n_tmp;
    }
    
    while(n>=Page_size)
    {
        EEprom_Page_write(Addr,Page_size,arr);
        Addr+=Page_size;
        n-=Page_size;
        arr+=Page_size;
    }
    if(n!=0)
        EEprom_Page_write(Addr,n,arr);
}
void EEprom_read(uint Addr,uchar n,uchar* arr)
{
    uchar i;
    I2C_start();
    I2C_write(EEPROM_BUS_ADDRESS);
    I2C_write(Addr>>8);
    I2C_write(Addr);
    I2C_start();
    I2C_write(EEPROM_BUS_ADDRESS|1);
    for(i=1;i<=n-1;i++)
    {
        *arr=I2C_read(1);
        arr++;
    }         
    *arr=I2C_read(0);
    I2C_stop();
}
void main(void)
{
// Declare your local variables here
    uchar i,data[200];
    UCSRA=0;
    UCSRB=0X18;
    UCSRC=0X86;
    UBRRH=0;
    UBRRL=0X19;
    I2C_init();
    for(i=0;i<200;i++){data=i;}
    EEprom_write(0x0aa,200,data);
    for(i=0;i<200;i++){data=0;}
    EEprom_read(0x0aa,200,data);
    for(i=0;i<200;i++){putchar(data);}

while (1)
      {
      // Place your code here

      }
}