请大家帮忙看看这段程序，DS1302的初始化有什么问题

ID:81283 · 发表于 2015-9-1 15:30

#include <reg52.h>
#include <intrins.h>

typedef signed char int8;
typedef signed int int16;
typedef signed long int32;
typedef unsigned char uint8;
typedef unsigned int uint16;
typedef unsigned long uint32;
/*---------------------------------------------
/* DS1302 Read Byte
/*-------------------------------------------*/
uint8 ReadByte()
{
uint8 i,tmp = 0x00;

io = 1; //IO 置1

for(i = 0; i < 8 ; i ++)
  {
if(io) tmp|=0x80;
sclk = 1 ;
sclk = 0;
tmp >>= 1;
  }

  return tmp;
}
/*---------------------------------------------
  DS1302 WriteByte()
--------------------------------------------*/
void WriteByte(uint8 dat)
{
uint8 i;

for(i = 0; i < 8 ; i ++)
{
io = (bit)(dat & 0x01);
sclk = 0;
sclk = 1;
dat >>= 1;
}

}
/*---------------------------------------------
/* DS1302 SingleRead
/*-------------------------------------------*/
uint8 SingleRead(uint8 addr)
{
uint8 tmp;
cs = 0;
sclk = 0;
  cs = 1;
WriteByte(addr);
tmp = ReadByte();
sclk = 0;
cs = 0;
return tmp;
}
/*----------------------------------------------
/* DS1302 SingleWrite
/---------------------------------------------*/
void SingleWrite(uint8 addr,uint8 dat)
{
  cs = 0;
sclk = 0;
  cs = 1;
WriteByte(addr);
WriteByte(dat);
sclk = 0;
cs = 0;
}

/*-----------------------------------------------
/* DS1302 GetTime
/*---------------------------------------------*/
void GetTime()
{
uint8 tmp;
tmp = SingleRead(0x81);

}
/*-----------------------------------------------
/* DS1302 INIT
/*---------------------------------------------*/
void ds1302_Init(void)
{
uint8 code DTime [] = {0x05,0x05,0x05,0x31,0x08,0x01,0x15};
  uint8 i,addr = 0x80;

  cs = 0;  //片选
  sclk = 0; //时钟线


  if((SingleRead(0x81) & 0x80) == 0x80)
  {
SingleWrite(0x8e,0x00);

for(i = 0; i < 8; i ++)
{
   SingleWrite(addr,DTime[i]);
   addr += 2;
}

SingleWrite(0x8e,0x80);
}


}

如果初始化程序没加判断语句的话能正常初始化时间并读取，但是如果加了判断语句，读出来的数据全是0。

ID:84652 · 发表于 2015-9-2 21:31

uint8 ReadByte()函数里for里面改成这个顺序试试：
sclk = 0;
tmp >>= 1;
if(io) tmp|=0x80;
sclk = 1 ;

ID:81283 · 发表于 2015-9-4 16:55

王朗的诱惑发表于 2015-9-2 21:31
uint8 ReadByte()函数里for里面改成这个顺序试试：
sclk = 0;
tmp >>= 1;

谢谢，已经弄好了。

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