DS1307 +lcd using PIC

[zakir_cool]

hi...i am trying a c code for rtc using pic...almost i have done,i have done all function in i2c....can any one tell that,after sending a data or address, we have to call ack funtion or else..it will call automatically..after sending..below is my code..can any body suggest me....

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Code C - [expand]
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unsigned char read_ds1307(unsigned char address)
{
unsigned char data;
I2CStart();
I2CSend(0xd0);
delay_ms(10);
I2CSend(address);
delay_ms(4);
I2CRestart();
delay_ms(10);
I2CSend(0xd1);
delay_ms(4);
data=I2CRead();
delay_ms(10);
I2CStop();
delay_ms(10);
return(data);
}
 
void write_ds1307(unsigned char address,unsigned char w_data)
{
I2CStart(); // issue I2C start signal
//address 0x68 followed by direction bit (0 for write, 1 for read) 0x68 followed by 0 --> 0xD0
I2CSend(0xD0); // send byte via I2C (device address + W)
delay_ms(10);
I2CSend(address); // send byte (address of DS1307 location)
delay_ms(10);
I2CSend(w_data); // send data (data to be written)
delay_ms(10);
I2CStop(); // issue I2C stop signal
delay_ms(10);
}
 
void I2CInit()
{
TRISC3 = 1; /* SDA and SCL as input pin */
TRISC4 = 1; /* these pins can be configured either i/p or o/p */
SSPSTAT = 0x80; /* Slew rate disabled */
SSPCON = 0x28; /* SSPEN = 1, I2C Master mode, clock = FOSC/(4 * (SSPADD + 1)) */
SSPADD = 0x28; /* 100Khz @ 4Mhz Fosc */
}
 
 
/*
Function: I2CStart
Return:
Arguments:
Description: Send a start condition on I2C Bus
*/
void I2CStart()
{
SEN = 1; /* Start condition enabled */
while(SEN); /* automatically cleared by hardware */
/* wait for start condition to finish */
}
 
/*
Function: I2CStop
Return:
Arguments:
Description: Send a stop condition on I2C Bus
*/
void I2CStop(){
PEN = 1; /* Stop condition enabled */
while(PEN); /* Wait for stop condition to finish */
/* PEN automatically cleared by hardware */
}
 
/*
Function: I2CRestart
Return:
Arguments:
Description: Sends a repeated start condition on I2C Bus
*/
void I2CRestart(){
RSEN = 1; /* Repeated start enabled */
while(RSEN); /* wait for condition to finish */
}
 
/*
Function: I2CAck
Return:
Arguments:
Description: Generates acknowledge for a transfer
*/
void I2CAck(){
ACKDT = 0; /* Acknowledge data bit, 0 = ACK */
ACKEN = 1; /* Ack data enabled */
while(ACKEN); /* wait for ack data to send on bus */
}
 
/*
Function: I2CNck
Return:
Arguments:
Description: Generates Not-acknowledge for a transfer
*/
void I2CNak(){
ACKDT = 1; /* Acknowledge data bit, 1 = NAK */
ACKEN = 1; /* Ack data enabled */
while(ACKEN); /* wait for ack data to send on bus */
}
 
/*
Function: I2CWait
Return:
Arguments:
Description: wait for transfer to finish
*/
void I2CWait(){
while ( ( SSPCON2 & 0x1F ) || ( SSPSTAT & 0x04 ) );
/* wait for any pending transfer */
}
 
/*
Function: I2CSend
Return:
Arguments: dat - 8-bit data to be sent on bus
data can be either address/data byte
Description: Send 8-bit data on I2C bus
*/
void I2CSend(unsigned char dat){
SSPBUF = dat; /* Move data to SSPBUF */
while(BF); /* wait till complete data is sent from buffer */
BF = 0;
I2CWait(); /* wait for any pending transfer */
}
 
/*
Function: I2CRead
Return: 8-bit data read from I2C bus
Arguments:
Description: read 8-bit data from I2C bus
*/
unsigned char I2CRead(void){
unsigned char temp;
/* Reception works if transfer is initiated in read mode */
RCEN = 1; /* Enable data reception */
while(!BF); /* wait for buffer full */
BF = 1;
temp = SSPBUF; /* Read serial buffer and store in temp register */
I2CWait(); /* wait to check any pending transfer */
return temp; /* Return the read data from bus */
}

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[siram kumar]

hi

automaticaly it will send the acknowledgment bit to the master

 

[zakir_cool]

then why,that is not working???progrm gt compiled bt,when i tried in proteus it is not working...

- - - Updated - - -

This is my main file...i think problem with the main file only....is i am setting the time and date is correct??????????????????????????????
can any body suggest that

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Code C - [expand]
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unsigned char I2CData[] = {0x00, 0x15, 0x11, 0x01, 0x25, 0x01, 0x09, 0x12};
    unsigned char *s[]={"SUN","MON","TUE","WED","THU","FRI","SAT"};
    unsigned char add = 0, d;
 
void main()
{
    
    TRISB =0x00; // Configure PORTB as output
    TRISD=0x00;
    TRISC=0x00;
    init_lcd();
    I2CInit(); //DS1307 I2C is running at 100KHz
 
      
            while(add<=6)   //update real time clock
                        {
                         //display_lcd("It's done here");
                        write_ds1307(add,I2CData[add]); 
                        add++;  
                        }
 
        while(1)
        {
            d=read_ds1307(0x02);//read hour 
            write_lcd((d/16)+48);
            write_lcd((d%16)+48);
            delay_ms(10);
            write_lcd(':');
            d=read_ds1307(0x01); // read minute;
            write_lcd((d/16)+48);
            write_lcd((d%16)+48);
            delay_ms(10);
            write_lcd(':');
            d=read_ds1307(0x00); // read second
            write_lcd((d/16)+48);
            write_lcd((d%16)+48);
            delay_ms(10);
            write_lcd(' ');
           display_lcd(s[read_ds1307(0x03)]); // read day
            delay_ms(10);
            cmd_lcd(0xc0);
            d=read_ds1307(0x04); // read date
            write_lcd((d/16)+48);
            write_lcd((d%16)+48);
            delay_ms(10);
             write_lcd('/');
            d=read_ds1307(0x05); // read month
            write_lcd((d/16)+48);
            write_lcd((d%16)+48);
            delay_ms(10);
            write_lcd('/');
            write_lcd('2');
            write_lcd('0');
            d=read_ds1307(0x06); // read year
            write_lcd((d/16)+48);
            write_lcd((d%16)+48);
            delay_ms(75);
            cmd_lcd(0x01);
        }
}

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[zakir_cool]

can be any body suggest...by checking the program...

 

[PA3040]

Can we see your DSN file and source code? hope you are using 16f877a MCU