ds1302读取只有三个能显示正确，怎么回事，实在检查不出问题所在

bencsj 2010-5-9 12:36 楼主

Write_Ds1302Byte(0x8f,0);
1。 sec = BCDToDEC(Read_DS1302Byte(SEC_READ));
   Delay(100);

2。 min = BCDToDEC(Read_DS1302Byte(MIN_READ));
            Delay(100);

3。 hour = BCDToDEC(Read_DS1302Byte(HOUR_READ));
            Delay(100);

4。 day = BCDToDEC(Read_DS1302Byte(DATE_READ));
            Delay(100);

5。 month = BCDToDEC(Read_DS1302Byte(MON_READ));
            Delay(100);

6。 year = BCDToDEC(Read_DS1302Byte(YEAR_READ));
            Delay(100);

每次读取时候只有1，3，5能显示正确，2，4，6显示不正确。不管怎么改读取的顺序，比如先读年再月日等等，都是只有1，3，5位置的能正确显示，2，4，6的不能。我加了延时还是不行，是怎么回事啊？大侠棒棒忙啊。

前面的1，2，3，4，5，6只是代表位置，这样好讲一点。实际程序中是没有的这几个数字

回复评论（5）

沙发 hgqxjj

#define SEC_WRI 0x80
#define SEC_READ 0x81
#define MIN_WRI 0x82
#define MIN_READ 0x83
#define HOUR_WRI 0x84
#define HOUR_READ 0x85
#define DATE_WRI 0x86
#define DATE_READ 0x87
#define MON_WRI 0x88
#define MON_READ 0x89
#define WEEK_WRI 0x8A
#define WEEK_READ 0x8B
#define YEAR_WRI 0x8C
#define YEAR_READ 0x8D

定义没问题啊

点赞 2010-5-9 14:04

板凳 BQZHANG

建议用“连续读取”的模式，这样比单个数据读取省时间。

#ifndef _DS1302_H_
#define _DS1302_H_
#include "const.h"
#include "chiptypedef.h"
/**********************************************
仅实现多字节读取模式，单字节和RAM的没有实现
仅实现24小时制模式，12小时制没实现
***********************************************/
//更改为合适的位
#define RST_PIN P3_2
#define SCLK_PIN P3_3
#define IO_PIN P3_4
typedef struct tagBCDDATETIME //注意：字节顺序必须和burst的传输顺序一致
{
BYTE nSecond;
BYTE nMinute;
BYTE nHour;
BYTE nDay;
BYTE nMonth;
BYTE nDayOfWeek;
BYTE nYear;
BYTE WriteProtect; // Before ANY write operation to the clock or RAM, bit 7 must be 0
}BCDDATETIME;
void InitDS1302();
void SetDateTime(const BCDDATETIME* pBCDDateTime);
void GetDateTime(BCDDATETIME* pBCDDateTime);
///////////////////////////////////////
//
typedef enum tagCOMMANDBYTE
{
SECOND_WRITE = 0x80,
SECOND_READ,
MINUTE_WRITE,
MINUTE_READ,
HOUR_WRITE,
HOUR_READ,
DATE_WRITE,
DATE_READ,
MONTH_WRITE,
MONTH_READ,
DAY_WRITE,
DAY_READ,
YEAR_WRITE,
YEAR_READ,
CONTROL = 0x8e, //控制寄存器
TRICKLE_CHARGE = 0x90, //涓流充电设置
CLOCK_BURST_WRITE = 0xbe, //burst模式传输字节
CLOCK_BURST_READ = 0xbf,
RAM_BURST_WRITE = 0xfe, //burst模式读写ram
RAM_BURST_READ = 0xff,
}COMMANDBYTE;
static void WriteSingleCmdByte(COMMANDBYTE cmd, BYTE Data);
static BYTE ReadSingleCmdByte(COMMANDBYTE cmd);
static void WriteOneByte(BYTE byte);
static BYTE ReadOneByte();
#endif

点赞 2010-5-9 16:38

4楼 elmerlee

1302接了上拉电阻就好了

点赞 2010-5-11 16:42

5楼 s3szy

#include "ds1302.h"
#include "stcdelay.h"
#define CLOCK_HALT_MASK 0x80 //1000 0000
#define HALF_FULL_MODE_MASK 0x80 //1000 0000 12/24小时模式
#define AM_PM_MASK 0x20 //0010 0000
#define DISABLE_WRITE_PROTECT 0x00 //允许写入
#define ENABLE_WRITE_PROTECT 0x80 //禁止写入
void InitDS1302()
{
BYTE temp = 0;
/*********************************************************
At power-up, RST must be a logic 0 until VCC > 2.0V.
Also SCLK must be at a logic 0 when RST is driven to
a logic 1 state.
*******************************************************/
RST_PIN = 0;
DelayMS(10);
RST_PIN = 1;
SCLK_PIN = 0;
WriteSingleCmdByte(CONTROL, DISABLE_WRITE_PROTECT); //允许写
/********************************************************************************
In order to prevent accidental enabling, only a pattern of 1010 will enable
the trickle charger(TCS),
有备用电池，涓流充电用处不大
*********************************************************************************/
WriteSingleCmdByte(TRICKLE_CHARGE, 0x00); //不使用充电功能
temp = ReadSingleCmdByte(SECOND_READ);//读出，然后再写入
RESET_STATE_FLAG(temp, CLOCK_HALT_MASK);//清CLOCK HALT FLAG,以便可以正常启动
WriteSingleCmdByte(SECOND_WRITE, temp);
}
static void WriteSingleCmdByte(COMMANDBYTE cmd, BYTE Data)
{
RST_PIN = 0;
SCLK_PIN = 0;
RST_PIN = 1;
WriteOneByte(cmd);
WriteOneByte(Data);
RST_PIN = 0;
}
static BYTE ReadSingleCmdByte(COMMANDBYTE cmd)
{
BYTE Ret = 0;
RST_PIN = 0;
SCLK_PIN = 0;
RST_PIN = 1;
WriteOneByte(cmd);
Ret = ReadOneByte();
RST_PIN = 0;
return Ret;
}
static void WriteOneByte(BYTE byte)
{
BYTE i = 0;
for(i = 0; i < 8; i++)
{
IO_PIN = TEST_BIT(byte, i);
SCLK_PIN = 1;
NOP();
NOP();
NOP();
SCLK_PIN = 0;
}
}
static BYTE ReadOneByte()
{
BYTE i = 0;
BYTE Ret = 0;
/*******************************************************************
Note that the first data bit to be transmitted occurs on the first falling
edge after the last bit of the command byte is written.
所以进入循环后马上读取IO数据
*******************************************************************/
for(i = 0; i < 8; i++)
{
if(IO_PIN)
{
SET_BIT(Ret, i);
}
SCLK_PIN = 1;
NOP();
NOP();
NOP();
SCLK_PIN = 0;
}
return Ret;
}
void SetDateTime(const BCDDATETIME* pBCDDateTime)
{
BYTE i = 0;
const BYTE* p = (BYTE*)pBCDDateTime;
RST_PIN = 0;
SCLK_PIN = 0;
RST_PIN = 1;
WriteOneByte(CLOCK_BURST_WRITE);
for(i = 0; i < 8; i++)
{
WriteOneByte(*p);
p++;
}
RST_PIN = 0;
}
void GetDateTime(BCDDATETIME* pBCDDateTime)
{
BYTE i = 0;
BYTE* p = (BYTE*)pBCDDateTime;
RST_PIN = 0;
SCLK_PIN = 0;
RST_PIN = 1;
WriteOneByte(CLOCK_BURST_READ);
/*******************************************************************
Note that the first data bit to be transmitted occurs on the first falling
edge after the last bit of the command byte is written.
所以进入循环后马上读取IO数据
*******************************************************************/
for(i = 0; i < 7; i++) //最后一个字节是写保护字节，不需要读取
{
*p = ReadOneByte();
p++;
}
RST_PIN = 0;
}

点赞 2010-5-9 16:39

6楼 szguojiquan

SEC_READ等的定义有问题，
1xxxxxx1 每个间隔为2，即从0x81起+2=0x83，+2=0x85，+2=0x87
到0x8D

点赞 2010-5-9 13:38