Posted on August 15, 2007 at 06:22hello everybody
i have a question about i2c(m24c01) application
i send 24 byte data to eeprom with i2c. i can send first 8 byte to eeprom. after that i try to send second byte but i2c hasn't writen
i generate wait function with for loop.i add wait function between
write(00) and write(08) codes. it's allright.
but i want to do this without wait function . namely i want to polling.
already thanks for help
void main(void)
{
.
.
.
i2ctemp[0]=0x23;
i2ctemp[1]=0x23;
i2ctemp[2]=0x24;
i2ctemp[3]=0x24;
i2ctemp[4]=0x28;
i2ctemp[5]=0x25;
i2ctemp[6]=0x30;
i2ctemp[7]=0x26;
write(00);
write(08);
}
void write(Byte address)
{
I2cTxBytes[1]=i2ctemp[0];
I2cTxBytes[2]=i2ctemp[1];
I2cTxBytes[3]=i2ctemp[2];
I2cTxBytes[4]=i2ctemp[3];
I2cTxBytes[5]=i2ctemp[4];
I2cTxBytes[6]=i2ctemp[5];
I2cTxBytes[7]=i2ctemp[6];
I2cTxBytes[8]=i2ctemp[7];
PBDR=0x66;
WriteEeprom(adres);
PBDR=0x77;
}
void WriteEeprom(unsigned char address)//,unsigned char data)
{
I2cTxBytes[0]=address;
I2cTxPtr=&I2cTxBytes[0];
I2cTxEndPtr=&I2cTxBytes[(Txpacketsize-1)];
I2cMode=1; //TX,mode master sends data to slave
I2c_Status=0;
GenerateStart();
PBDR=0x80;
while(!I2c_Status);
PBDR=0X84;
}
void I2C_It_Func(void)
{
unsigned char Temp;
Temp=I2CSR1;
if(Temp == (EVF|BUSY|MS_SL)) //EV6
{
I2CCR|=PE;
Temp = I2CSR1;
}
if(I2CSR2&AF)
{
PADR=0xFF;
}
if(I2cMode==1) //Transmit data to eeprom
{
if(Temp & SB)
{
I2CDR=SlaveAdr; //SlaveAdr=0xA6
}
else if(Temp&BTF)
{
if(Temp&TRA)
{
if(I2cTxPtr==(I2cTxEndPtr+1))
{
I2c_Status=1;
GenerateStop();
}
else
{
I2CDR=*I2cTxPtr;
I2cTxPtr++;
}
}
}
}
if(I2cMode==2) //Recieve data to eeprom
{
if(Temp & SB)
{
if(RepStart==0)
{
I2CDR=SlaveAdr;
}
else
{
I2CDR=(SlaveAdr|0x01);
RepStart=0;
}
}
else if(Temp&BTF)
{
if(Temp&TRA)
{
if(RepStart==1)
{
GenerateStart();
}
else
{
I2CDR=*I2cTxPtr;
RepStart=1; //Repeated Start signal will be generated.
}
}
else
{
if(!(I2cRxPtr==I2cRxEndPtr))
{
if(I2cRxPtr==(I2cRxEndPtr-1))
{
I2CCR&=~ACK;
*I2cRxPtr=I2CDR;
GenerateStop();
I2cRxPtr++;
}
else
{
*I2cRxPtr=I2CDR;
I2cRxPtr++; //RepStart=0;
}
}
else
{
*I2cRxPtr=I2CDR;
I2c_Status=1; }
}
}
}
}
