pic 16 using 8563 rtc iic communication internal iic

void init_iic()
{
    
    time.second=57;
    time.minute=2;
    time.hour=12;
    time.day=1;
    time.week=3;
    time.month=3;
    time.year=17;//Default time
    TRISCbits.TRISC3=1; //iic master mode is configured as input
    TRISCbits.TRISC4=1;
    SSP1STAT=0x00;  
    SSP1CON1=0x38; //Enable iic master mode
    SSP1CON2=0x00;  
    SSP1ADD=0x19;//Baud rate setting 400K HZ
}

void IIC_write_n(unsigned char addr,unsigned char length,unsigned char *pbuf)//Write
{ 
    unsigned char send_da;
unsigned char i=0; 
    SSP1IF=0; //MSSP interrupt flag bit 0 means no waiting for your corresponding interrupt
 // SEN=1;//Start bit The start enable bit is only in IIC master mode //Establish and send a start signal timing on the SDA and SCL lines
  SSP1CON2bits.SEN=1;
while(!SSP1IF); 
SSP1IF=0;  
SSP1BUF=0xA2;//Write control bit //Send peripheral IIC device address and write signalwhile
(!SSP1IF); 
SSP1IF=0; //Software clearing will not automatically clear
SSP1BUF=addr;//Start addresswhile
(!SSP1IF); 
SSP1IF=0; 

for(i=0;i{
send_da=*(pbuf++);
SSP1BUF=send_da;
while(!SSP1IF); 
SSP1IF=0;
}
SSP1CON2bits.PEN=1;
//PEN=1;//Stop bit //Establish and send a stop signal timing on the SDA and SCL lineswhile
(!SSP1IF); //If a stop signal is received
, SSP1IF=0  will also be set ;
  
 } 

void IIC_write(unsigned char addr,unsigned char data)//write
{ 
    SSP1IF=0; //MSSP interrupt flag bit 0 means no corresponding interrupt is waiting for you
    SSP1CON2bits.SEN=1;
 // SEN=1;//Start bit The start enable bit is only in IIC master mode //Establish and send a start signal timing on the SDA and SCL lines
while(!SSP1IF); 
SSP1IF=0;  
SSP1BUF=0xA2;//Write control bit//Send the peripheral IIC device address and write signal
while(!SSP1IF); 
SSP1IF=0; //Software clearing will not automatically clear
SSP1BUF=addr;//Write address//Send the address of the peripheral IIC device data to be read
while(!SSP1IF); 
SSP1IF=0;  
SSP1BUF=data;//write data//send the data or command to be stored in the peripheral IIC device to be readwhile
(!SSP1IF); 
SSP1IF=0;  
SSP1CON2bits.PEN=1;
//PEN=1;//stop bit //Establish and send a stop signal timing on the SDA and SCL lineswhile (!SSP1IF); //If a stop signal is received , SSP1IF=0 
will also be set ;  }  unsigned char IIC_read_n(unsigned char addr,unsigned char length,unsigned char *pbuf)//read  { //unsigned char data;   //unsigned int receive_da; unsigned char i=0; SSP1IF=0;   SSP1CON2bits.SEN=1; //SEN=1;//start  bitwhile(!SSP1IF);  SSP1IF=0;  SSP1BUF=0xA2;//control bit writewhile  (!SSP1IF); SSP1IF=0;   SSP1BUF=addr;//write addresswhile   (!SSP1IF);  SSP1IF=0;  SSP1CON2bits.RSEN=1;  // RSEN=1;//restart      bitwhile(!SSP1IF);       SSP1IF=0;       SSP1BUF=0xA3;//control bit readwhile       (!SSP1IF);       SSP1IF=0; 

     
























// RCEN=1;//Enable receiving FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF
// while(!SSPIF); 
     for(i=0;i{
         SSP1CON2bits.RCEN=1;//Enable receivingwhile 
     (!SSP1IF); 
*pbuf =SSP1BUF;
//SSPBUF=send_da;
while(!SSP1IF); 
SSP1IF=0;
SSP1CON2bits.ACKDT=0;
 // ACKDT=0;
SSP1CON2bits.ACKEN=1;
    // ACKEN=1;//Enable acknowledge 
      bitwhile(!SSP1IF); 
     SSP1IF=0;
     pbuf++;
}
     SSP1CON2bits.RCEN=0;
     // RCEN=0;
     SSP1CON2bits.PEN=1;
    // PEN=1;//Stop 
     bitwhile(!SSP1IF); 
     SSP1IF=0; 
     return *pbuf;   
     
}

//unsigned char IIC_read(unsigned char addr)//Read 
//{ unsigned char data;  
//
//SSP1IF=0;  
//SSP1CON2bits.SEN=1;
SEN=1;//Start bit 
//while(!SSP1IF); 
//SSP1IF=0; 
//SSP1BUF=0xA2;//Control bit write 
//while(!SSP1IF);
//SSP1IF=0;  
//SSP1BUF=addr;//Write address  
//while(!SSP1IF); 
//SSP1IF=0;
//SSP1CON2bits.RSEN=1;
// // RSEN=1;//Restart bit
// while(!SSP1IF); 
// SSP1IF=0; 
// SSP1BUF=0xA3;//Control bit read 
// while(!SSP1IF); 
// SSP1IF=0; 
// SSP1CON2bits.RCEN=1;
// // RCEN=1;//Enable reception 
// while(!SSP1IF); 
// data=SSP1BUF;//Read data 
// while(!SSP1IF);
// SSP1IF=0;
// SSP1CON2bits.ACKDT=0;
// // ACKDT=0;
// //ACKEN=1;//Enable acknowledge bit 
// SSP1CON2bits.ACKEN=1;
// while(!SSP1IF); 
// SSP1IF=0;
// SSP1CON2bits.RCEN=0;
// // RCEN=0;
// SSP1CON2bits.PEN=1;
// // PEN=1;//Stop bit 
// while(!SSP1IF); 
// SSP1IF=0; 
// return(data);  
//}

unsigned char BCD2Val(unsigned char x) //BCD to decimal
{
    unsigned char tmp = 0;

tmp = ((unsigned char)(x & (unsigned char)0xF0) >> (unsigned char)0x04) * 10;
return (tmp + (x & (unsigned char)0x0F));


}

unsigned char Val2BCD(unsigned char x) //Decimal to BCD code subroutine
{
    
    
    unsigned char bcdhigh = 0;

while (x >= 10)
{
bcdhigh++;
x -= 10;
}

return ((unsigned char)(bcdhigh << 4) | x);
 
}
unsigned char P8563_Read_Time() //PCF8563 read time subroutine
{
    
    unsigned char temp[7];
IIC_read_n(0x02,0x07,temp);

time.second=BCD2Val(temp[0]&0x7f);
time.minute=BCD2Val(temp[1]&0x7f);
time.hour=BCD2Val(temp[2]&0x3f);
time.day=BCD2Val(temp[3]&0x3f);
time.week=BCD2Val(temp[4]&0x07);
time.month=BCD2Val(temp[5]&0x1f);
time.year=BCD2Val(temp[6]);
return 0;
 
}

void P8563_Set_Time()   //PCF8563设置时间子程序
{
unsigned char temp[7];
unsigned char i;
for(i=0;i<7;i++)
{
temp[i]=Val2BCD(((unsigned char *)(&time))[i]);
}
 IIC_write_n(0x02,7,temp);
}