Master Slave Clocks with PIC16F887

koolguy · Apr 10, 2015

Hello,
it is not working i think internal osc is not working, what you think??
PORTB=data[i%16];
1 // only

PORTB=data[i>>4];
un numerical data

MCU88 · Apr 10, 2015

Perhaps someone should start off with a much less ambitious project such as an LED roulette wheel. No perhaps an decision maker with 4 LEDs. One for "yes", "no", "maybe" and "definitely" ...

MCU88 · Apr 10, 2015

koolguy said:
Hello,
what you think??

I think you are driving Ian bonkers trying to help you.

koolguy · Apr 10, 2015

Perhaps someone should start off with a much less ambitious project such as an LED roulette wheel. No perhaps an decision maker with 4 LEDs. One for "yes", "no", "maybe" and "definitely" ...

So, you think it is difficult project?
anyway what you do sir?

Ian Rogers · Apr 10, 2015

MCU88 said:
I think you are driving Ian bonkers trying to help you.

And some!!!!

What I don't get, is why bother using a library, then just dismissing it completely.

Once you include the I2C library all you need to do is use the Read and Write functions..

No stop, start, ack, nack.... Just ReadRtc and WriteRtc.... its not rocket science...

Ian Rogers · Apr 10, 2015

If you look at post #65

In the while loop I use ReadClock(&time[0]); This contains everything to put all the time into the time[] array..

Then I display them.... just take a bit of time and run through it!!!!

MCU88 · Apr 10, 2015

koolguy said:
So, you think it is difficult project?
anyway what you do sir?

I think it is perhaps not for you if you lack basic computer programming understanding. What do I do? Well I would like to open an electronics shop and sell parts and offer custom engineering services. Perhaps if I get too busy I can bring some jobs to this forum...

koolguy · Apr 10, 2015

that good...!!

koolguy · Apr 10, 2015

Hello,
In #65
There is delay two function what is the use of it??
and

C:

//Sends the start and device address.
//If the device is busy then it resends until accepted.
void SendID(char DeviceID)
   {
   SendStart();
   if(SendByte(DeviceID)==1)     // Send ID until accepted..
     return;
   do
     {
     SendRestart();
     }while(SendByte(DeviceID)==0);
   }

sendbytes what is this?

C:

//Write a byte to The RTC
char WriteRTC(char Address, char Byte)
   {
   SendID(0b11010000);         // Send 0xD0
   if(SendByte(Address&0xff)==0)   // Send address
     return(0);
   if(SendByte(Byte)==0)       // Send byte
     return(0);
   SendStop();             // All done
   return(1);
   }

C:

 ReadClock(&Time[0]);               // Get time ( BCD format as
     delayMs(250);                   // we are using  7 seg )
     DISP[5] = Time[2]>>4; DISP[4] = Time[2] & 0xf;   // fill display buffer
     DISP[3] = Time[1]>>4; DISP[2] = Time[1] & 0xf;   // backwards so it's
     DISP[1] = Time[0]>>4; DISP[0] = Time[0] & 0xf;   // readable...

how it is working i want only min and hour !

Ian Rogers · Apr 10, 2015

Forget the two functions SendID() and WiteRTC().... They are low level.... All you need concern yourself with is ReadClock().. you call that routine periodically then Time[0] = seconds.. Time[1] = minutes and Time[2] = Hours..

If you are working on a real board you will need to initiate the clock..

To do this write this..

unsigned char Time[] = {0, 43 , 16, 0 , 10, 4, 15}; Instead of whats there.. FYI ( 16:43 10/04/2015 my time here )

Then add WriteClock(&Time[0]); before the while loop.... To set the time

koolguy · Apr 11, 2015

The main problem in my code i posted earlier is the ds1307 is not updating he sec in it, why?
is the i2c speed freq is to fast??
because i am directly reading the bits in i by PORTB=i;

void I2C_init(void)
{
SSPCON = 0x38; // set I2C master mode
SSPCON2 = 0x00;
SSPADD = 0x0C; //400KHZ 20MHz xtal
SSPSTAT|=0X80;
PSPIF=0; // clear SSPIF interrupt flag
BCLIF=0; // clear bus collision flag
}

koolguy · Apr 11, 2015

What that this mean?
it should be deleted?

Forget the two functions SendID() and WiteRTC().... They are low level....

koolguy · Apr 11, 2015

Hello,
its not updating showing 0 0 8 only

C:

#include <htc.h>

__CONFIG(LVP_OFF & BOREN_OFF & PWRTE_ON & WDTE_OFF & FOSC_HS);
#define _XTAL_FREQ 20000000
#define SDATA RC4
#define SCLK RC3
void InitI2C(),I2C_start(void),I2C_write(char x), I2cSTOP(void);   
void i2c_Wait(void);
unsigned char DISP[3];
unsigned char Time[] = {01, 11 ,33, 22 , 10, 4, 15};
unsigned char digits[] = {  0b00010000,0b01111101,0b00100011,0b00101000,0b01001101,0b10001000,
0b10000000, 0b00111101,0X00,0b00001000};

void InitI2C()
   {
   TRISC3=1;
   TRISC4=1;
   SSPCON=0b00101000;
   SSPCON2=0;
   SSPSTAT=0b10000000;
   SSPADD=50;  //20000/(4*100);  //Fosc/(4*baud)
   SSPIF=0;
   BCLIF=0;
   }


void WaitSSP()
   {
   while(SSPIF==0);
   SSPIF=0;
   }


void SendStart()
   {
   SEN=1;
   WaitSSP();
   }

void SendStop()
   {
   PEN=1;
   WaitSSP();
   }


void SendRestart()
   {
   RSEN=1;
   WaitSSP();
   }


char SendByte(char Byte)
   {
   SSPBUF=Byte;
   WaitSSP();
   return(!ACKSTAT);
   }


char ReceiveByte()
   {
   RCEN=1;         // get byte
   WaitSSP();
   return(SSPBUF);
   }


void SendNack()
   {
   ACKDT=1;       // Not Acknowledge
   ACKEN=1;
   WaitSSP();
   }


void SendAck()
   {
   ACKDT=0;       // Acknowledge
   ACKEN=1;
   WaitSSP();
   }

void SendID(char DeviceID)
   {
   SendStart();
   if(SendByte(DeviceID)==1)     // Send ID until accepted..
     return;
   do
     {
     SendRestart();
     }while(SendByte(DeviceID)==0);
   }


char ReadRTC(char Address)
   {
   char Byte;
   SendID(0b11010000);         // Send 0xD0
  if(SendByte(Address&0xff)==0)   // Send address
     return(0);
   SendRestart();           // Re-start
   if(SendByte(0b11010001)==0)     // Read 0xD1
     return(0);
   Byte=ReceiveByte();         // Get byte
   SendNack();             // No more
   SendStop();             // Stop bus
   return(Byte);           // All done
   }

void WriteClock(char *array)       // Not used
   {
   char x;
   int tmp;
   for(x=0;x<7;x++)
     {
     tmp = array[x] / 10;
     tmp << = 4;
     tmp += array[x] % 16;
     WriteRTC(x,tmp);
     } 
   } 

void ReadClock(char *array)
   {
   char x;
   for(x=0;x<7;x++)
     array[x] = ReadRTC(x);       // No need to BCD-BIN
   } 



            
void main(void)
   {
ANSELH = 0;
    TRISC3=1; //direction to input have be changed
    TRISC4=1;

RD0=0;
RD1=0;
RD2=0;
RD3=0;
TRISB=0X00;
TRISD=0X00;
PORTB=0B00000000;
unsigned char ch=0;
unsigned char i=0;
   int idx;          
   unsigned char DIGIT;       // A temporary store for manipulation
   TRISC = 0;             // portc tris bits
   TRISD = 0;             // portd tris bits
  InitI2C();
 
   while(1)
     {
     ReadClock(&Time[0]);             
     __delay_ms(250);                  
   
    DISP[2] = Time[1] & 0xf;  
     DISP[1] = Time[0]>>4; DISP[0] = Time[0] & 0xf;  
   
RD0=1;
RD1=0;
RD2=0;
RD3=0;

       PORTB = digits[DISP[0]];         // retrive 7 seg code
       __delay_ms(250); 
RD0=0;
RD1=1;
RD2=0;
RD3=0;

       PORTB = digits[DISP[1]];         // retrive 7 seg code
       __delay_ms(250); 

RD0=0;
RD1=0;
RD2=1;
RD3=0;

       PORTB = digits[DISP[2]];         // retrive 7 seg code

       __delay_ms(250); 


      



 
     } 
 
   }

Ian Rogers · Apr 11, 2015

C:

#include <htc.h>

__CONFIG(LVP_OFF & BOREN_OFF & PWRTE_ON & WDTE_OFF & FOSC_HS);
#define _XTAL_FREQ 20000000
#define SDATA RC4
#define SCLK RC3
void InitI2C(),I2C_start(void),I2C_write(char x), I2cSTOP(void);  
void i2c_Wait(void);
unsigned char DISP[3];
unsigned char Time[] = {01, 0x11 ,0x3, 0x22 , 0x10, 0x4, 0x15};
unsigned char digits[] = {  0b00010000,0b01111101,0b00100010,0b00101000,0b01001101,0b10001000,
0b10000000, 0b00111101,0X00,0b00001000};

void InitI2C()
  {
  TRISC3=1;
  TRISC4=1;
  SSPCON=0b00101000;
  SSPCON2=0;
  SSPSTAT=0b10000000;
  SSPADD=50;  //20000/(4*100);  //Fosc/(4*baud)
  SSPIF=0;
  BCLIF=0;
  }

void WaitSSP()
  {
  while(SSPIF==0);
  SSPIF=0;
  }

void SendStart()
  {
  SEN=1;
  WaitSSP();
  }

void SendStop()
  {
  PEN=1;
  WaitSSP();
  }


void SendRestart()
  {
  RSEN=1;
  WaitSSP();
  }

char SendByte(char Byte)
  {
  SSPBUF=Byte;
  WaitSSP();
  return(!ACKSTAT);
  }


char ReceiveByte()
  {
  RCEN=1;  // get byte
  WaitSSP();
  return(SSPBUF);
  }

void SendNack()
  {
  ACKDT=1;  // Not Acknowledge
  ACKEN=1;
  WaitSSP();
  }

void SendAck()
  {
  ACKDT=0;  // Acknowledge
  ACKEN=1;
  WaitSSP();
  }

void SendID(char DeviceID)
  {
  SendStart();
  if(SendByte(DeviceID)==1)  // Send ID until accepted..
  return;
  do
  {
  SendRestart();
  }while(SendByte(DeviceID)==0);
  }

//Write a byte to The RTC
char WriteRTC(char Address, char Byte)
  {
  SendID(0b11010000);  // Send 0xD0
  if(SendByte(Address&0xff)==0)  // Send address
  return(0);
  if(SendByte(Byte)==0)  // Send byte
  return(0);
  SendStop();  // All done
  return(1);
  }

char ReadRTC(char Address)
  {
  char Byte;
  SendID(0b11010000);  // Send 0xD0
  if(SendByte(Address&0xff)==0)  // Send address
  return(0);
  SendRestart();  // Re-start
  if(SendByte(0b11010001)==0)  // Read 0xD1
  return(0);
  Byte=ReceiveByte();  // Get byte
  SendNack();  // No more
  SendStop();  // Stop bus
  return(Byte);  // All done
  }

void WriteClock(char *array)  // Not used
  {
  char x;
  int tmp;
  for(x=0;x<7;x++)
  {
  WriteRTC(x,array[x]);
  }
  }

void ReadClock(char *array)
  {
  char x;
  for(x=0;x<7;x++)
  array[x] = ReadRTC(x);  // No need to BCD-BIN
  }



   
void main(void)
  {
   unsigned char ch=0;
   unsigned char i=0;
   int idx;   
   unsigned char DIGIT;  // A temporary store for manipulation

   ANSELH = 0;
  TRISC3=1; //direction to input have be changed
  TRISC4=1;

   RD0=0;
   RD1=0;
   RD2=0;
   RD3=0;
   TRISB=0X00;
   TRISD=0X00;
   PORTB=0B00000000;
   
   TRISC = 0;  // portc tris bits
   TRISD = 0;  // portd tris bits
   InitI2C();
   WriteClock(&Time[0]);
   while(1)
     {
     ReadClock(&Time[0]);   
     __delay_ms(250);   
   
     DISP[2] = Time[1] & 0xf;  
     DISP[1] = Time[0]>>4; DISP[0] = Time[0] & 0xf;  
     
     PORTD = 1;
   
     PORTB = digits[DISP[0]];  // retrive 7 seg code
     __delay_ms(250);

     PORTD = 2;

     PORTB = digits[DISP[1]];  // retrive 7 seg code
     __delay_ms(250);

     PORTD = 4;

     PORTB = digits[DISP[2]];  // retrive 7 seg code

  __delay_ms(250);
  }
  }

This works well!! Time and display....... your number 2 digit was wrong... I corrected it... Also there was some ReadModifyWrite crap going on so I changed the PORTD writes to suit!!!

koolguy · Apr 11, 2015

The pic kit 2 showing error...

koolguy · Apr 11, 2015

hello,
I have changed the delat to 10mSec

it start with
001
011
.
.
591
002...

like this when micro power is off , the clock start from 000 it should internally work!
while(1)
{
ReadClock(&Time[0]);
__delay_ms(10);

DISP[2] = Time[1] & 0xf;
DISP[1] = Time[0]>>4; DISP[0] = Time[0] & 0xf;

PORTD = 1;

PORTB = digits[DISP[0]]; // retrive 7 seg code
__delay_ms(10);

PORTD = 2;

PORTB = digits[DISP[1]]; // retrive 7 seg code
__delay_ms(10);

PORTD = 4;

PORTB = digits[DISP[2]]; // retrive 7 seg code

__delay_ms(10);
}
}

Ian Rogers · Apr 11, 2015

You're getting close....

koolguy · Apr 11, 2015

Hello,
i think the WriteClock(&Time[0]); function is in main so, it must be writing again.
so, how to once write the setting?
and do you think the sec is working perfect in time??

Ian Rogers · Apr 11, 2015

The write clock function is BEFORE the while loop so it is executed once only... If the seconds keep resetting then the micro is resetting...

On my simulator it works fine....

koolguy · Apr 12, 2015

The write clock function is BEFORE the while loop so it is executed once only... If the seconds keep resetting then the micro is resetting...

Hello,
The micro will reset after power off, but the DS1307 is running from battery backup!
So, what to do to get accurate time after power off ?

micro is resetting.
How to avoid this??

Master Slave Clocks with PIC16F887

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