RT，本人按照那个RTC的时序来写的程序，死活读不了时钟的数据，网上基本上全是51驱动的这个芯片，不知道哪位用stm32驱动过这个片子，求解答！！！以下是本人写的读写函数
//写DS12C887函数
void write_ds(unsigned char add,unsigned char date)
{
  dscs = 0;
  dsas = 0;
  dsds = 1;
  dsrw = 1;  
  wad0 = (add & 0x01); //先写地址 
  wad1 = ((add & 0x02) >>1);
  wad2 = ((add & 0x04) >>2);
  wad3 = ((add & 0x08) >>3);
  wad4 = ((add & 0x10) >>4);
  wad5 = ((add & 0x20) >>5);
  wad6 = ((add & 0x40) >>6);
  wad7 = ((add & 0x80) >>7);  
  dsas = 1;
  dsrw = 0;
  wad0 = (date & 0x01); //再写数据
  wad1 = ((date & 0x02) >>1);
  wad2 = ((date & 0x04) >>2);
  wad3 = ((date & 0x08) >>3);
  wad4 = ((date & 0x10) >>4);
  wad5 = ((date & 0x20) >>5);
  wad6 = ((date & 0x40) >>6);
  wad7 = ((date & 0x80) >>7);
  dsrw = 1;
  dsas = 0;
  dscs = 1;
}

//读DS12C887函数
unsigned char read_ds(unsigned char add)
{
  unsigned char ds_date;
  unsigned char d1;
  unsigned char d2;
  unsigned char d3;
  unsigned char d4;
  unsigned char d5;
  unsigned char d6;
  unsigned char d7;
  unsigned char d8;
  dscs = 0;
  dsas = 0;
  dsds = 1;
  dsrw = 1;
  wad0 = (add & 0x01); //先写地址 
  wad1 = ((add & 0x02) >>1);
  wad2 = ((add & 0x04) >>2);
  wad3 = ((add & 0x08) >>3);
  wad4 = ((add & 0x10) >>4);
  wad5 = ((add & 0x20) >>5);
  wad6 = ((add & 0x40) >>6);
  wad7 = ((add & 0x80) >>7);  
  dsas = 1;
  dsds = 0;
  d1 = (rad7 << 7);
  d2 = (rad6 << 6);
  d3 = (rad5 << 5);
  d4 = (rad4 << 4);
  d5 = (rad3 << 3);
  d6 = (rad2 << 2);
  d7 = (rad1 << 1);
  d8 = rad0 ;
  ds_date = (d1 + d2 + d3 + d4 + d5 + d6 + d7 + d8);//再读数据
  dsds = 1;
  dsas = 0;
  dscs = 1;
  return ds_date;
}