Interfacing DS1302(RTC) with an 8051... The time display on Lcd can run but there are problems!! Need some help and guide.

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May 9, 2011 at 6:33 am #3843

Ang wei qiang
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For all the 1,3,5,7,9mins and so on…or maybe i should say is the odd

mins.

It will display something like the patterns shown below for the 1

minute.

Here is a example of 85error that it display.

The first 5 patterns of the "1 hr and 5min

"01:85:00"

"01:05:01"

"01:85:02"

"01:05:03"

"01:85:04"

As for all the 2,4,6,8,10mins and so on…or maybe i should say is the

even mins.

It will display something like the patterns shown below for the first

59 second and the 1 hour.

For the first 59 second,i show first five patterns of it.

"00:85:00"

"85:00:01"

"00:85:02"

"85:00:03"

"00:85:04"

.

.

.

.

"85:00:59"

For the starting of 1 minute,i show first five patterns of it.

"00:85:00"

"00:01:01"

"00:85:02"

"00:01:03"

"00:85:04"

.

.

.

.

For the starting of 1 hour,i show first five patterns of it.

"01:85:00"

"85:00:01"

"01:85:02"

"85:00:03"

"01:85:04"

.

.

.

.

On top is the error that i face,im not sure how can i solve it.

The DS1302 header file,i got on a website and i have modify it to make the time to run.

What can be the problem that causing this??

Let me know anything that i could try to solve this problem.

Please,I need some guide and help with it.

I will paste the header file. Let me know if you want to see my c code. ~~ THx ~~

Below is the modified header file code: (There are some part of it which i do not understand)

/***************************************************************************/

#ifndef _REAL_TIMER_DS1302_2003_7_21_

#define _REAL_TIMER_DS1302_2003_7_21_

#define DS1302_CLK P1_7 //ÊµÊ±Ê±ÖÓÊ±ÖÓÏßÒý½Å

#define DS1302_IO P1_6 //ÊµÊ±Ê±ÖÓÊý¾ÝÏßÒý½Å

#define DS1302_RST P1_5 //ÊµÊ±Ê±ÖÓ¸´Î»ÏßÒý½Å

sbit ACC0 = ACC^0 ;

sbit ACC7 = ACC^7 ;

typedef struct __SYSTEMTIME__

{

unsigned char Second;

unsigned char Minute;

unsigned char Hour;

unsigned char Week;

unsigned char Day;

unsigned char Month;

unsigned char Year;

unsigned char DateString[9];

unsigned char TimeString[9];

}SYSTEMTIME; //¶¨ÒåµÄÊ±¼äÀàÐÍ

#define AM(X) X

#define PM(X) (X+12) // ×ª³É24Ð¡Ê±ÖÆ

#define DS1302_SECOND 0x80

#define DS1302_SECOND_READ 0x81

#define DS1302_MINUTE 0x82

#define DS1302_MINUTE_READ 0x83

#define DS1302_HOUR 0x84

#define DS1302_HOUR_READ 0x85

#define DS1302_WEEK 0x8A

#define DS1302_WEEK_READ 0x8B

#define DS1302_DAY 0x86

#define DS1302_DAY_READ 0x87

#define DS1302_MONTH 0x88

#define DS1302_MONTH_READ 0x89

#define DS1302_YEAR 0x8C

#define DS1302_YEAR_READ 0x8D

#define DS1302_RAM(X) (0xC0+(X)*2) //ÓÃÓÚ¼ÆËã DS1302_RAM µØÖ·µÄºê

void DS1302InputByte(unsigned char d) //ÊµÊ±Ê±ÖÓÐ´ÈëÒ»×Ö½Ú(ÄÚ²¿º¯Êý)

{

unsigned char i;

ACC = d;

for(i=8; i>0; i–)

{

DS1302_IO = ACC0; //Ïàµ±ÓÚ»ã±àÖÐµÄ RRC

DS1302_CLK = 1;

DS1302_CLK = 0;

ACC = ACC >> 1;

}

}

unsigned char DS1302OutputByte(void) //ÊµÊ±Ê±ÖÓ¶ÁÈ¡Ò»×Ö½Ú(ÄÚ²¿º¯Êý)

{

unsigned char i;

for(i=8; i>0; i–)

{

ACC = ACC >>1; //Ïàµ±ÓÚ»ã±àÖÐµÄ RRC

ACC7 = DS1302_IO;

DS1302_CLK = 1;

DS1302_CLK = 0;

}

return(ACC);

}

void Write1302(unsigned char ucAddr, unsigned char ucDa) //ucAddr: DS1302µØÖ·, ucData: ÒªÐ´µÄÊý¾Ý

{

DS1302_CLK = 0;

DS1302_RST = 1;

DS1302InputByte(ucAddr); // µØÖ·£¬ÃüÁî

DS1302InputByte(ucDa); // Ð´1ByteÊý¾Ý

DS1302_CLK = 1;

DS1302_RST = 0;

}

unsigned char Read1302(unsigned char ucAddr) //¶ÁÈ¡DS1302Ä³µØÖ·µÄÊý¾Ý

{

unsigned char ucData;

DS1302_CLK = 0;

DS1302_RST = 1;

DS1302InputByte(ucAddr); // µØÖ·£¬ÃüÁî

ucData = DS1302OutputByte(); // ¶Á1ByteÊý¾Ý

DS1302_CLK = 1;

DS1302_RST = 0;

return(ucData);

}

void DS1302_SetProtect(bit flag) //ÊÇ·ñÐ´±£»¤

{

if(flag)

Write1302(0x8E,0x80);

else

Write1302(0x8E,0x00);

}

void DS1302_SetTime(unsigned char Address, unsigned char Value) // ÉèÖÃÊ±¼äº¯Êý

{

DS1302_SetProtect(0);

Write1302(Address, ((Value/10)<<4 | (Value%10)));

DS1302_SetProtect(1);

}

void DS1302_GetTime(SYSTEMTIME *Time)

{

unsigned char ReadValue;

ReadValue = Read1302(DS1302_SECOND_READ);

Time->Second = ((ReadValue&0x70)>>4)*10 + (ReadValue&0x0F);

ReadValue = Read1302(DS1302_MINUTE_READ);

Time->Minute = ((ReadValue&0x70)>>4)*10 + (ReadValue&0x0F);

ReadValue = Read1302(DS1302_HOUR_READ);

Time->Hour = ((ReadValue&0x70)>>4)*10 + (ReadValue&0x0F);

ReadValue = Read1302(DS1302_DAY_READ);

Time->Day = ((ReadValue&0x70)>>4)*10 + (ReadValue&0x0F);

ReadValue = Read1302(DS1302_WEEK_READ);

Time->Week = ((ReadValue&0x70)>>4)*10 + (ReadValue&0x0F);

ReadValue = Read1302(DS1302_MONTH_READ);

Time->Month = ((ReadValue&0x70)>>4)*10 + (ReadValue&0x0F);

ReadValue = Read1302(DS1302_YEAR_READ);

Time->Year = ((ReadValue&0x70)>>4)*10 + (ReadValue&0x0F);

}

void DateToStr(SYSTEMTIME *Time)

{

Time->DateString[0] = Time->Year/10 + '0';

Time->DateString[1] = Time->Year%10 + '0';

Time->DateString[2] = '-';

Time->DateString[3] = Time->Month/10 + '0';

Time->DateString[4] = Time->Month%10 + '0';

Time->DateString[5] = '-';

Time->DateString[6] = Time->Day/10 + '0';

Time->DateString[7] = Time->Day%10 + '0';

Time->DateString[8] = '';

}

void TimeToStr(SYSTEMTIME *Time)

{

Time->TimeString[0] = Time->Hour/10 + '0';

Time->TimeString[1] = Time->Hour%10 + '0';

Time->TimeString[2] = ':';

Time->TimeString[3] = Time->Minute/10 + '0';

Time->TimeString[4] = Time->Minute%10 + '0';

Time->TimeString[5] = ':';

Time->TimeString[6] = Time->Second/10 + '0';

Time->TimeString[7] = Time->Second%10 + '0';

Time->DateString[8] = '';

}

/*

void Initial_DS1302(void)

{

unsigned char Second=Read1302(DS1302_SECOND);

if(Second&0x80)

DS1302_SetTime(DS1302_SECOND,0);

}

void BurstWrite1302(unsigned char *pWClock) //ÍùDS1302Ð´ÈëÊ±ÖÓÊý¾Ý(¶à×Ö½Ú·½Ê½)

{

unsigned char i;

Write1302(0x8e,0x00); // ¿ØÖÆÃüÁî,WP=0,Ð´²Ù×÷?

DS1302_RST = 0;

DS1302_CLK = 0;

DS1302_RST = 1;

DS1302InputByte(0xbe); // 0xbe:Ê±ÖÓ¶à×Ö½ÚÐ´ÃüÁî

for (i = 8; i>0; i–) //8Byte = 7Byte Ê±ÖÓÊý¾Ý + 1Byte ¿ØÖÆ

{

DS1302InputByte(*pWClock); // Ð´1ByteÊý¾Ý

pWClock++;

}

DS1302_CLK = 1;

DS1302_RST = 0;

}*/

/********************************************************************************

void BurstRead1302(unsigned char *pRClock) //¶ÁÈ¡DS1302Ê±ÖÓÊý¾Ý(Ê±ÖÓ¶à×Ö½Ú·½Ê½)

{

unsigned char i;

DS1302_RST = 0;

DS1302_CLK = 0;

DS1302_RST = 1;

DS1302InputByte(0xbf); // 0xbf:Ê±ÖÓ¶à×Ö½Ú¶ÁÃüÁî

for (i=8; i>0; i–)

{

*pRClock = DS1302OutputByte(); // ¶Á1ByteÊý¾Ý

pRClock++;

}

DS1302_CLK = 1;

DS1302_RST = 0;

}

*/

void DS1302_TimeStop(bit flag) // ÊÇ·ñ½«Ê±ÖÓÍ£Ö¹

{

unsigned char Data;

Data=Read1302(DS1302_SECOND_READ);

DS1302_SetProtect(0);

if(flag)

Write1302(DS1302_SECOND, Data|0x80);

else

Write1302(DS1302_SECOND, Data&0x7F);

DS1302_SetProtect(1);

}

#endif
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