pcf8563 external RTC driver based on STM32F10x

#define uchar unsigned char
#endif

#define SEC     0x02 //Second register
#define MIN     0x03 //Minute register
#define HOUR    0x04 //Hour register
#define DAY     0x05 //Day register
#define WEEK    0x06 //Week register
#define MONTH   0x07 //Month register
#define YEAR    0x08 //Year register #
define read_ADD 0xA3 //Write device address
#define write_ADD 0xA2 //Read device address

tm timer_8563;

// char ResetTime[ResetTime_Len];   //Timer reset time RAM global (week-day-hour-minute) 80-80-12-00 Set to 80 and the corresponding alarm will be invalid

#define PCF8563_SCK_High()  {   GPIO_InitTypeDef GPIO_InitStructure;
                GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
                GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_OD  ;
                GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
                GPIO_Init(GPIOD, &GPIO_InitStructure);
                GPIO_SetBits(GPIOD, GPIO_Pin_11);}
#define PCF8563_SCK_Low()   {   GPIO_InitTypeDef GPIO_InitStructure;
                GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
                GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_OD  ;
                GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
                GPIO_Init(GPIOD, &GPIO_InitStructure);
                GPIO_ResetBits(GPIOD, GPIO_Pin_11);}

#define PCF8563_DATA_High() {   GPIO_InitTypeDef GPIO_InitStructure;
                GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
                GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_OD  ;
                GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
                GPIO_Init(GPIOD, &GPIO_InitStructure);
                GPIO_SetBits(GPIOD, GPIO_Pin_10);}
#define PCF8563_DATA_Low()  {   GPIO_InitTypeDef GPIO_InitStructure;
                GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
                GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_OD  ;
                GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
                GPIO_Init(GPIOD, &GPIO_InitStructure);
                GPIO_ResetBits(GPIOD, GPIO_Pin_10);}
#define PCF8563_DATA_In()   {   GPIO_InitTypeDef GPIO_InitStructure;
                GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
                GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_OD ;
                GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
                GPIO_Init(GPIOD, &GPIO_InitStructure);}
#define PCF8563_DATA_Sta()  (   GPIO_ReadInputDataBit(GPIOD, GPIO_Pin_10))

void Delay_8563()
{
int i=100;
while(i--);
}

void Start()
{
PCF8563_DATA_High();
PCF8563_SCK_High();
Delay_8563();
PCF8563_DATA_Low();
Delay_8563();
PCF8563_SCK_Low();
}

void Stop()
{
PCF8563_DATA_Low();
PCF8563_SCK_Low();
Delay_8563();
PCF8563_SCK_High();
Delay_8563();
PCF8563_DATA_High();
Delay_8563();
}

void WriteACK(uchar ack)
{
if(ack)
{
PCF8563_SCK_High();
}
else
{
PCF8563_SCK_Low();
}
Delay_8563();
PCF8563_SCK_High();
Delay_8563();
PCF8563_SCK_Low();
}

void WaitACK()
{ 
uchar errtime=20;
PCF8563_DATA_High();
Delay_8563();
PCF8563_SCK_High();
Delay_8563();
PCF8563_DATA_In();
while(PCF8563_DATA_Sta())
{
errtime--;
if(!errtime) Stop();
}
PCF8563_SCK_Low();
Delay_8563();
}

void writebyte(uchar wdata)
{
uchar i;
for(i=0;i<8;i++)
{
if(wdata&0x80)
{
PCF8563_DATA_High();
}
else
{
PCF8563_DATA_Low();
}
wdata<<=1;
PCF8563_SCK_High();
Delay_8563();
PCF8563_SCK_Low();
}
WaitACK();     //I2C器件或通讯出错，将会退出I2C通讯
}

uchar Readbyte()
{
uchar i,bytedata;
PCF8563_DATA_High();
for(i=0;i<8;i++)
{
PCF8563_SCK_High();
bytedata<<=1;
PCF8563_DATA_In();
if(PCF8563_DATA_Sta())
bytedata|=0x01;
else
bytedata|=0x00;
PCF8563_SCK_Low();
Delay_8563();
}
return(bytedata);
}

void writeData(uchar address,uchar mdata)
{
Start();
writebyte(0xa2);
writebyte(address);
writebyte(mdata);
Stop();
}

uchar ReadData(uchar address)
{
uchar rdata;
Start();
writebyte(0xa2);
writebyte(address);
Start();
writebyte(0xa3);
rdata=Readbyte();
WriteACK(1);
Stop();
return(rdata);
}
void ReadData1(uchar address,uchar count,uchar * buff)
{
uchar i;
Start();
writebyte(0xa2);
writebyte(address);
Start();
writebyte(0xa3);
for(i=0;i
{
buff[i]=Readbyte();
if(i
}
WriteACK(1);
Stop();
}

void P8563_set_time(u8 year,u8 month,u8 day,u8 hour,u8 min,u8 sec,u8 week)
{
  Start();//Initialize
 
  writeData(YEAR,year);
  writeData(MONTH,month);
  writeData(DAY, day);
  writeData(HOUR,hour);
  writeData(MIN,min);
  writeData(SEC,sec);
  writeData(WEEK,week);
}

void P8563_get_time()
{
  timer_8563.w_year = ReadData(YEAR);
  timer_8563.w_month = ReadData(MONTH);
  timer_8563.w_date = ReadData(DAY);
  timer_8563.hour = ReadData(HOUR);
  timer_8563.min = ReadData(MIN);
  timer_8563.sec = ReadData(SEC);
  timer_8563.week = ReadData(WEEK);
}

void P8563_init(void)
{
  writeData(0x0,0x00);
  writeData(0x09,0x80); //Minute alarm is invalid
  writeData(0x0a,0x80); //Hour alarm is invalid
  writeData(0x0b,0x80); //Daily alarm is invalid
  writeData( 0x0c,0x80); //week alarm is invalid
  writeData(0x01,0x00);

}