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simplest 8051 interfacing with DS1307

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Hi,

All i need to know is from where i can get a simplest program in C for interfacing 8051 or any other micro with DS1307.

Regards,

Simran
 
Hi Simran,

Do you have the basic I²C routines? I can post C routines to access the DS1307 but you would need the basic I2C library.

Mike.
 
Well...

hi,

i am not having basic i2c routines....

please help me in my other doubt...

what is wrong in my this program... see...

Code:
#include<reg51.h>
void main(void)
{
  sbit ravi = P1^0;
  while(1)
  {
  ravi = 1;
  ravi = 0;
  }
}

the error i am getting is :
 

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I'm sorry but I'm not familiar with 8051. My guess is that the above should be,

Code:
#include<reg51.h>
#define ravi P1.0     //ravi = port1 bit 0

void main(void)
{
  while(1)
  {
  ravi = 1;
  ravi = 0;
  }
}

Mike.
 
____________________________________________________________
#include<reg51.h>
sbit ravi = P1^0; /// define the port out side main....
void main(void)
{

while(1)
{
ravi = 1;
ravi = 0;
}
}
______________________________________________

the cycle will be so fast that you will not see any change externally .........

better give it a try with a delay in between them
 
_________________________________________________________________
#include<reg51.h>

void main(void)
{
sbit ravi = P1^0;
while(1)
{
ravi = 1;
delay ();
ravi = 0;
delay();
}
}
__________________________________________________________________

So Mrs Simran

You might have got the correct reply for the above
you should add delay

NaveenCali
 
Hello,

Can any one look at my code and guess what i am doing wrong with my code.

I cannot read neither write to ds1307.

connected through port d bits 5 and 6

crystall oscillator 10Mhz but using hspll

have pull up resistors on both lines sda and scl



//************************************************************************************//
//************************************************************************************//
// //
// Header: 8722 Project //
// PIC used: PIC18F8722 //
// Start Date: 1st Dec 2009
// Function for I2C //
//************************************************************************************//
//************************************************************************************//
//** HEADER FILES ********************************************************************/
#include <p18F8722.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <usart.h>
#include <timers.h>
#include <delays.h>
#include <i2c.h>
//** CONFIGURATION BITS **************************************************************/
#pragma config OSC = HSPLL
#pragma config WDT = OFF
#pragma config LVP = OFF
#pragma config DEBUG = ON
//** FUNCTION PROTOTYPES *************************************************************/
void Init_Ports(void);
void Configure_I2C2(void);

void I2C2_Write(unsigned char Add, unsigned char Data);
void Write(unsigned char Input_Data);
unsigned char I2C2_Read(unsigned char add);

void SCL_high(void);
void SCL_low(void);
//** DEFINITIONS *********************************************************************/
#define IniDs1307 0x00
#define AddRDs1307 0xD1
#define AddWDs1307 0xD0
#define CLEAR 0
#define SET 1
#define BRGValue 0x63

//** GLOBALS *************************************************************************/

unsigned char Second, Minutes, Hours, Day, Date, Month, Year;
//** MAIN CODE ***********************************************************************/
void main(void)
{
Init_Ports();
Configure_I2C2 ();


I2C2_Write(0x07,0x00); // control register add 07, 00 as i am not using swqe, rs0, rs1

I2C2_Write(0x00,0x05);// control register for seconds,also CH=0 initialized for first time (bit 7), add = 0x00, value assigned 0x05
I2C2_Write(0x01,0x07);// control register for minutes, add = 0x01, value assigned 0x07 (just to see whther the RTC works)
I2C2_Write(0x02,0x06);// control register for Hours, add = 0x02, value assigned 0x06

I2C2_Write(0x03,0x02);// control register for Day, add = 0x03, value assigned 0x02

I2C2_Write(0x04,0x03);// control register for Day, add = 0x04, value assigned 0x03
I2C2_Write(0x05,0x02);// control register for Month, add = 0x05, value assigned 0x02
I2C2_Write(0x06,0x04);// control register for Year, add = 0x06, value assigned 0x04

Second = I2C2_Read(0x00);
Minutes = I2C2_Read(0x01);
Hours = I2C2_Read(0x02);

Day = I2C2_Read(0x03);
Date = I2C2_Read(0x04);
Month = I2C2_Read(0x05);
Year = I2C2_Read(0x06);
StopI2C2();

while(SET)
{
Nop();
}
}

//*************************************************************************************
void Init_Ports(void)
{
PORTD = CLEAR;
LATD = 0b01100000;
TRISD = 0b01100000; // intialized RD6(SCL2) AND RD5(SDA2).
}
//*************************************************************************************
void Configure_I2C2 (void)
{
SSP2CON1 = 0b00001000;
SSP2STAT = 0b10000000;
SSP2ADD = 0x63;

//SSP2ADD = (BYTE) _I2C_BAUD_COUNT;
SSP2CON2bits.ACKSTAT = 1;
SSP2CON1bits.SSPEN = 1;
OpenI2C2(MASTER, SLEW_OFF);
}
//***********************************writes data to add***************************************************
void I2C2_Write(unsigned char Add, unsigned char Data)
{
PIR3bits.SSP2IF= CLEAR;

StartI2C2();

Write(0xD0);
IdleI2C2();

Write(Add);
IdleI2C2();

Write(Data);
IdleI2C2();

StopI2C2();
}
//***********************function of write***********************************
void Write(unsigned char Input_Data)
{
unsigned char data, i, Outbit;
data = Input_Data;

for (i = 0; i <= 7; i++)
{
Outbit=data&0x80;
PORTDbits.RD5 = Outbit;
data = data << 1;
SCL_high();
SCL_low();
}

while (SSP2CON2bits.ACKSTAT == 1) { }



}
//**************reads add and returs data**********************************
unsigned char I2C2_Read(unsigned char add)
{
unsigned char dataa;

StartI2C2();
Write(0xd1); // to write
IdleI2C2();



Write(add); // address to read
IdleI2C2();



if (DataRdyI2C2())
{
getcI2C2();
}
dataa = SSP2BUF;

while (SSP2CON2bits.ACKSTAT == 1) { }
PIR1bits.SSPIF = 0; // clear flag


NotAckI2C2();
StopI2C2();

//dataa = (dataa & 0x0f) + (dataa>>4)*10; // chuyenthanh so thap phan
return (dataa);
}
//*************************************************
void SCL_high(void)
{
PORTDbits.RD6 = 1;
Delay1KTCYx(1000);
}

//*************************************************
void SCL_low(void)
{
PORTDbits.RD6= 0;
Delay1KTCYx(1000);
}
 
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