LPC23xx通过I2C接口读写AT24C64

else//sendNOACK

if(ACK==0)

{

I20CONCLR=I2CONCLR_AAC;

}

I20CONCLR=I2CONCLR_SIC|I2CONCLR_STAC;// clear SISAT

while (!(I20CONSET&I2CONCLR_SIC));// wait interrupt flag ( waiting for SI==1)

if(ACK==1)

{

if((I20STAT&0xF8)==0x50) //receive data and get ack

{

*RcvData=I20DAT;

return TRUE;

}

else

return FALSE ;

}

else

if(ACK==0)

{

if((I20STAT&0xF8)==0x58) //receive data and get NoAck (the last data you want to get)

{

*RcvData=I20DAT;

return TRUE;

}

else

return FALSE ;

}

return FALSE ;

}

DWORD I2C_ReadNByte(UINT16 SubAddr ,UINT8 *Data,UINT8 Length)

{

BYTEi;

if (!I2CStart())

{

return FALSE;

}

if(I20STAT==0x08)/*已发送起始条件*/

{

I2C_SendByte(AT24C64NW);// Device Address

if(I20STAT==0x18) /*已发送SLA+W，已接收ACK */

{

I2C_SendByte((SubAddr>>8)&(0x00FF));

if(I20STAT==0x28)/*已发送SubAddr_H，已接收ACK */

{

I2C_SendByte(SubAddr&(0x00FF));

if(I20STAT==0x28) /*已发送SubAddr_L，已接收ACK */

{

if (I2CStartAgain())//发送重复起始条件切换为主接受模式

{

I2C_SendByte(AT24C64NR);

if(I20STAT==0x40)/*已发送SLA+R，已接收ACK*/

{

for(i=0;i

{

if(!(I2C_ReadByte(1,&Data[i])))

{

return FALSE;

}

}

if( !( I2C_ReadByte(0, &Data[Length-1]) ) ) //读最后一个数据

{

return FALSE;

}

if (I2CStop())//发送停止条件

{

return TRUE;

}

return FALSE;

}

return FALSE;

}

return FALSE;

}

return FALSE;

}

return FALSE;

}

return FALSE;

}

return FALSE;

}