AT89C51 8BIT LCD INTERFACE (ARRAY METHOD)

 #include<reg51.h>
 sbit RS=P0^0;
 sbit RW=P0^1;
 sbit EN=P0^2;
 #define ldata P1
 void lcd_init();
 void cmd(unsigned char c);
 void dat(unsigned char c);
 void delay(unsigned int i);
 void main()
 {
 int p;
 char arr[12]={'E','M','B','E','D','D','E','D',' ','L','A','B'};
  lcd_init();
 for(p=0;p<12;p++)
 dat(arr[p]);
 while(1);

 }

 void lcd_init()
 {
 cmd(0X01);
 delay(10);
 cmd(0X08);
 delay(10);
 cmd(0X0e);
 delay(10);
 cmd(0X38);
 delay(10);
 }
 void cmd(unsigned char c)
 {
  int i;
  ldata=c;
  RS=0;
  RW=0;
  EN=1;
  for(i=0;i<10;i++);
  EN=0;
  return;
 }
 void dat(unsigned char c)
 {
 int i;
 ldata=c;
 RS=1;
 RW=0;
 EN=1;
 for(i=0;i<=10;i++);
 EN=0;
 return;
 }
 void delay(unsigned int b)
 {
 unsigned int i,j;
 for(i=0;i<b;i++)
 for(j=0;j<3000;j++);
 }

AT89C51 LCD(4BIT) INTERFACE

#include<reg51.h>
void cmd(unsigned char c);
void dat(unsigned char c);
void init();

void delay(unsigned int i)
{
while(i--);
}
void string(unsigned char *);
void main()
{
init();
cmd (0x80);
string("EMBEDDED LAB");
cmd (0xc0);
string("WWW.SUMMITBHARDWAJ.BLOGSPOT.IN");
while(1)
{
}
}
void init()
{
cmd(0x02);
delay(1000);
cmd(0x28);
delay(1000);
cmd(0x01);
delay(1000);
cmd(0x0e);
delay(1000);

}
void cmd(unsigned char c)
{
unsigned char l,h;
l=(c&0x0f);
h=(c>>4);
P3=h;
P2=0x04;
delay(1000);
P2=0x00;
P3=l;
P2=0x04;
delay(1000);
P2=0x00;
}
void dat(unsigned char c)
{
unsigned char l,h;
l=c&0x0f;
h=c>>4;
P3=h;
P2=0x05;
delay(1000);
P2=0x01;
P3=l;
P2=0x05;
delay(1000);
P2=0x01;
}
void string(unsigned char *p)
{
while(*p!='\0')
{
delay(100);
 dat(*p);
 p++;
 }

 }

AT89C51 KEYPAD VALUE ON LCD

#include<reg51.h>
#define port P3
sbit rs=P2^0;
sbit rw=P2^1;
sbit e=P2^2;
void delay()
{
unsigned int i;
for(i=0;i<3000;i++);
}
void cmd(unsigned int c)
{
port=c;
rs=0;
rw=0;
e=1;
delay();
e=0;
}
void dat(unsigned int c)
{
port=c;
rs=1;
rw=0 ;
e=1  ;
delay();
e=0;
}
void lcd_init()
{
cmd(0x01);
cmd(0x80);
cmd(0x0c);
cmd(0x38);
}
 void digit(unsigned int i)
 {
  unsigned char a,k=0x82;
   cmd(0x01);
  do
  {
  cmd(k--);
  a=i%10;
  dat(48+a);
  cmd(0x80);
  delay();
  i=i/10;
 }
 while(i>0);
 }
void main()
{
int a,b,c;
lcd_init();
P2=0x00;
while(1)
{
P1=0xf0;
while(P1==0xf0);
a=P1;
P1=0x0f;
b=P1;
while(P1!=0x0f);
c=a|b;
P2=c;
if(c==0xe7)
{
digit(1);
}
else if(c==0xeb)
{
digit(2);
}
else if(c==0xed)
{
digit(3);

}
else if(c==0xee)
{
digit(4);

}
else if(c==0xd7)
{
digit(5);
}
else if(c==0xdb)
{
digit(6);
}
else if(c==0xdd)
{
digit(7);
}
else if(c==0xde)
{
digit(8);
}
else if(c==0xb7)
{
digit(9);
}
else if(c==0xbb)
{
digit(10);
}
else if(c==0xbd)
{
digit(11);
}
else if(c==0xbe)
{
digit(12);
}
else if(c==0x77)
{
digit(13);
}
else if(c==0x7b)
{
digit(14);
}
else if(c==0x7d)
{
digit(15);
}
else if(c==0x7e)
{
digit(16);
}
}
}

AT89C51 KEYPAD VALUE ON LED BAR

#include<reg51.h>
void delay(unsigned int i)
{
while(i--);
}
void main()
{
int a,b,c;
P2=0x00;
while(1)
{
P1=0xf0;
while(P1==0xf0);
a=P1;
P1=0x0f;
b=P1;
c=a|b;
P2=c;
}
}

AT89C51 COUNTER

#include<reg51.h>

void main()

{

int x;

TMOD=0x05;

TR0=1;

TH0=0;

TL0=0;

while(1)

{

while(TF0==0)

{

P1=TH0;

P2=TL0;

}

TF0=0;

}

}

AT89C51 ADC

#include<reg51.h>
#include<stdio.h>
 sbit RS=P0^0;
 sbit RW=P0^1;
 sbit EN=P0^2;
 sbit cs=P2^0;
 sbit rd=P2^1;
 sbit wr=P2^2;
 sbit intr=P2^3;
 #define ldata P1
 void lcd_init();
 void cmd(unsigned char c);
 void dat(unsigned char c);
 void delay(unsigned int i);
 void digit(unsigned int i);
 int adc()
 {
 unsigned int x;
 cs=0;
 wr=0;
 delay(1);
 wr=1;
 rd=1;
while(intr==1);
 rd=0;
 x=P3;
 return x;
 }
 void main()
 {
 unsigned char z[20],i=0,s[]="WWW.SUMMITBHARDWAJ.BLOGSPOT.IN";
  unsigned int v,a,t;
lcd_init();
 cmd(0x80);

 while(s[i]!='\0')
 {
 dat(s[i]);
 i++;
}
 
   while(1)
{
a=adc();
v=((a*5)/255);
t=((a*5)/2.55);
sprintf(z,"ADC=%3d volt=%2dV temp=%3d'c",a,v,t);
 cmd(0xc0);
 i=0;
 while(z[i]!='\0')
 {
 dat(z[i]);
 i++;
}
}
 }
 
 void digit(unsigned int i)
 {
 unsigned char a,c=0x85;

 do
 {
  cmd(c--);
 a=i%10;
 dat(48+a);
 cmd(0x80);
 delay(10);
 i=i/10;
 }
 while(i>0);
 }

 void lcd_init()
 {
 cmd(0X01);
 delay(10);
 cmd(0X08);
 delay(10);
 cmd(0X0c);
 delay(10);
 cmd(0X38);
 delay(10);
 }
 void cmd(unsigned char c)
 {
  int i;
  ldata=c;
  RS=0;
  RW=0;
  EN=1;
  for(i=0;i<10;i++);
  EN=0;
  return;
 }
 void dat(unsigned char c)
 {
 int i;
 ldata=c;
 RS=1;
 RW=0;
 EN=1;
 for(i=0;i<=10;i++);
 EN=0;
 return;
 }
 void delay(unsigned int b)
 {
 unsigned int i,j;
 for(i=0;i<b;i++)
 for(j=0;j<3000;j++);
 }

PIC16F1518 SERIAL COMMUNICATION

#include<pic.h>
#include<htc.h>
#define __PIC16F1518_H
#define _XTAL_FREQ   16000000

__CONFIG( FOSC_HS & WDTE_OFF & PWRTE_ON & CP_OFF & BOREN_ON & LVP_OFF &  WRT_OFF );

void TX(unsigned char Byte);
unsigned int a1;

void interrupt ISR(void)
{
if(RCIF)  // If UART Rx Interrupt
{
if(OERR) // If over run error, then reset the receiver
{
CREN = 0;
CREN = 1;
}

TX(RCREG); // Echo back received char
}
}


void UART(void)
{
TRISC6 = 0;   // TX Pin
TRISC7 = 1;   // RX Pin

SPBRG = 103;
BRGH  = 1;                   // Fast baudrate
SYNC  = 0; // Asynchronous
SPEN  = 1; // Enable serial port pins
CREN  = 1; // Enable reception
SREN  = 0; // No effect
TXIE  = 0; // Disable tx interrupts
RCIE  = 1; // Enable rx interrupts
TXEN  = 0; // Reset transmitter
TXEN  = 1; // Enable the transmitter
}


void TX(unsigned char Byte)  // Writes a character to the serial port
{
while(!TXIF);  // wait for previous transmission to finish
TXREG = Byte;
}

unsigned char RX(void)   // Reads a character from the serial port
{
if(OERR) // If over run error, then reset the receiver
{
CREN = 0;
CREN = 1;
}

        while(!RCIF);  // Wait for transmission to receive
a1 = RCREG;
return a1;
}

void String(unsigned char*p)
{
while(*p)
TX(*p++);
}

void main(void)
{
UART(); // Intialize UART

    String("EMBEDDED_LAB,WWW.SUMMITBHARDWAJ.BLOGSPOT.IN"); // Send string on UART

GIE  = 1;   // Enable global interrupts
        PEIE = 1;   // Enable Peripheral Interrupts

while(1)
{

}
}

PIC16F1518 RTC BY BIT BANGING

#include<pic.h>
#include<htc.h>
#define __PIC16F1518_H
#define _XTAL_FREQ   16000000

__CONFIG( FOSC_INTOSC & WDTE_OFF & PWRTE_ON & CP_OFF & MCLRE_ON & BOREN_ON & LVP_OFF &  WRT_OFF );

unsigned char RTCArray[4];
unsigned char Temp;

#define SDA_ADC ANSA3
#define SCK_ADC ANSA5




// Function Declarations
void cmd(unsigned char);
void dat(char);
void InitLCD(void);
void string(unsigned char *s);
void clrscr(void);
void DisplayTimeToLCD(unsigned char*) ;
void DisplayDateOnLCD( unsigned char*);


// Define i2c pins
#define SDA RA3 // Data pin for i2c
#define SCK RA5 // Clock pin for i2c
#define SDA_DIR        TRISA3 // Data pin direction
#define SCK_DIR        TRISA5 // Clock pin direction


// Define macros
#define Set_SDA_Low SDA_DIR = 0
#define Set_SDA_High        SDA_DIR = 1
#define Set_SCK_Low SCK_DIR = 0
#define Set_SCK_High        SCK_DIR = 1

//Function Declarations
void InitI2C(void);
void I2C_Start(void);
void I2C_ReStart(void);
void I2C_Stop(void);
void I2C_Send_ACK(void);
void I2C_Send_NACK(void);
bit  I2C_Write_Byte(unsigned char);
unsigned char I2C_Read_Byte(void);


// Define DS1307 i2c device address
#define RTC_ADDRESS 0xD0

// Define Time Modes
#define AM_Time 0
#define PM_Time 1
#define TwentyFourHoursMode        2

// Define days
#define Mon 1
#define Tue 2
#define Wed       3
#define Thu        4
#define Fri 5
#define Sat       6
#define Sun 7

// Function Declarations
void Write_Byte_To_DS1307_RTC(unsigned char, unsigned char);
unsigned char Read_Byte_From_DS1307_RTC(unsigned char);
void Write_Bytes_To_DS1307_RTC(unsigned char,unsigned char*,unsigned char);
void Read_Bytes_From_DS1307_RTC(unsigned char,unsigned char*,unsigned int);
void Set_DS1307_RTC_Time(unsigned char,unsigned char,unsigned char,unsigned char);
unsigned char* Get_DS1307_RTC_Time(void);
void Set_DS1307_RTC_Date(unsigned char,unsigned char,unsigned char,unsigned char);
unsigned char* Get_DS1307_RTC_Date(void);

void delay(unsigned int i)
{
    while(i--);
}

void cmd(unsigned char c)
{
unsigned int l,h;
l = c &0X0F;
h = c >>4;

        LATC5 = 0;
        LATC = h;
        LATC4 = 1;
        delay(5);
        LATC4 = 0;

        LATC = l;
        LATC4 = 1;
        delay(5);
        LATC4 = 0;



}


void dat(unsigned char c)
{
unsigned int l,h;
l=c &0X0F;
h=c >>4;

        LATC = h;
        LATC4 = 1;
        LATC5 = 1;
        delay(5);
        LATC4 = 0;


        LATC = l;
        LATC4 = 1;
        LATC5 = 1;
        delay(5);
        LATC4 = 0;

}

void InitLCD(void)
{
cmd(0x02);
delay(1);
cmd(0x28);
delay(1);
cmd(0x01);
delay(1);
cmd(0x80);
delay(1);
cmd(0x0e);
delay(1);
}


void string(unsigned char *s)
{
while(*s!='\0')
{
dat(*s);
s++;
}
}


void clrscr(void)       // Clear the Screen and return cursor to zero position
{
cmd(0x01);    // Clear the screen
delay(160);              // Delay for cursor to return at zero position
}


void DisplayTimeToLCD( unsigned char* Time )   // Displays time in HH:MM:SS AM/PM format
{
clrscr();      // Move cursor to zero location and clear screen

// Display Hour
dat ((Time[2]/10)+0x30);
dat ((Time[2]%10)+0x30);

//Display ':'
dat(':');

//Display Minutes
dat ((Time[1]/10)+0x30);
dat ((Time[1]%10)+0x30);

//Display ':'
dat(':');

//Display Seconds
dat ((Time[0]/10)+0x30);
dat ((Time[0]%10)+0x30);

//Display Space
dat (' ');

// Display mode
switch(Time[3])
{
case AM_Time: string("AM"); break;
case PM_Time: string("PM"); break;

default: dat('H'); break;
}
}




void DisplayDateOnLCD( unsigned char* Date )   // Displays Date in DD:MM:YY @ Day format
{
cmd(0xc0);      // Move cursor to second line

// Display Date
dat ((Date[1]/10)+0x30);
dat ((Date[1]%10)+0x30);

//Display '/'
dat('/');

//Display Month
dat ((Date[2]/10)+0x30);
dat ((Date[2]%10)+0x30);

//Display '/'
dat('/');

//Display Year
dat ((Date[3]/10)+0x30);
dat ((Date[3]%10)+0x30);

//Display Space
dat(' ');

// Display Day
switch(Date[0])
{
case Mon: string("MONDAY"); break;
case Tue: string("TUEDAY"); break;
case Wed: string("WEDNESDAY"); break;
case Thu: string("THURSDAY"); break;
case Fri: string("FRIDAY"); break;
case Sat: string("SATURDAY"); break;
case Sun: string("SUNDAY"); break;

default: string("???"); break;
}
}






// Function Purpose: Set initial values of SCK and SDA pins
void InitI2C(void)
{
    SDA_ADC   = 1; // Make analog output
SCK_ADC  = 1; // Make analog output
// Make SDA and SCK pins input initially
SDA_DIR = 1;
SCK_DIR = 1;

// Write zero in output register of SDA and SCK pin
SDA = 0;
SCK = 0;

}


// Function Purpose: I2C_Start sends start bit sequence
void I2C_Start(void)
{
SDA = 0; // Write zero in output register
SCK = 0; // of SDA and SCK pin

Set_SCK_High; // Make SCK pin high
Set_SDA_High; // Make SDA pin High
delay(2); // Half bit delay
Set_SDA_Low; // Make SDA Low
delay(2); // Half bit delay
}


// Function Purpose: I2C_ReStart sends start bit sequence
void I2C_ReStart(void)
{
Set_SCK_Low; // Make SCK pin low

delay(1); // Data pin should change it's value,
// when it is confirm that SCK is low
Set_SDA_High; // Make SDA pin High

delay(1); // 1/4 bit delay
Set_SCK_High; // Make SCK pin high
delay(1); // 1/4 bit delay
Set_SDA_Low; // Make SDA Low
delay(1); // 1/4 bit delay
}


//Function : I2C_Stop sends stop bit sequence
void I2C_Stop(void)
{
Set_SCK_Low; // Make SCK pin low

delay(1); // Data pin should change it's value,
// when it is confirm that SCK is low
Set_SDA_Low; // Make SDA pin low

delay(1); // 1/4 bit delay
Set_SCK_High; // Make SCK pin high
delay(1); // 1/4 bit delay
Set_SDA_High; // Make SDA high
delay(1); // 1/4 bit delay
}



//Function : I2C_Send_ACK sends ACK bit sequence
void I2C_Send_ACK(void)
{
Set_SCK_Low; // Make SCK pin low
delay(1); // Data pin should change it's value,
// when it is confirm that SCK is low
Set_SDA_Low; // Make SDA Low
delay(1); // 1/4 bit delay
Set_SCK_High; // Make SCK pin high
delay(2); // Half bit delay
}


//Function : I2C_Send_NACK sends NACK bit sequence
void I2C_Send_NACK(void)
{
Set_SCK_Low; // Make SCK pin low
delay(1); // Data pin should change it's value,
// when it is confirm that SCK is low
Set_SDA_High; // Make SDA high
delay(1); // 1/4 bit delay
Set_SCK_High; // Make SCK pin high
delay(2); // Half bit delay
}


// Function Purpose: I2C_Write_Byte transfers one byte
bit I2C_Write_Byte(unsigned char Byte)
{
    static bit ACK = 0;
unsigned char i; // Variable to be used in for loop

for(i=0;i<8;i++) // Repeat for every bit
{
Set_SCK_Low; // Make SCK pin low

delay(1); // Data pin should change it's value,
// when it is confirm that SCK is low

if((Byte<<i)&0x80)  // Place data bit value on SDA pin
Set_SDA_High; // If bit is high, make SDA high
else // Data is transferred MSB first
Set_SDA_Low; // If bit is low, make SDA low

delay(1); // Toggle SCK pin
Set_SCK_High; // So that slave can
delay(2); // latch data bit
    }

// Get ACK from slave
Set_SCK_Low;
    Set_SDA_High;
    delay(2);
    Set_SCK_High;
    delay(2);
SDA_ADC  = 0; // Make digital input
ACK = SDA; // Read data pin status
SDA_ADC  = 1; // Make analog output

return ACK;
}


// Function Purpose: I2C_Read_Byte reads one byte
unsigned char I2C_Read_Byte(void)
{
unsigned char i, RxData = 0;

for(i=0;i<8;i++)
{
Set_SCK_Low; // Make SCK pin low
Set_SDA_High; // Don't drive SDA
delay(2); // Half bit delay
Set_SCK_High; // Make SCK pin high
delay(1); // 1/4 bit delay
SDA_ADC  = 0; // Make digital input
RxData = RxData|(SDA<<(7-i)); // Captured received bit
SDA_ADC  = 1; // Make analog output
delay(1); // 1/4 bit delay
}

    return RxData; // Return received byte
}





// Function Purpose: Write_Byte_To_DS1307_RTC writes a single byte on given address
// Address can have any value fromm 0 to 0xFF, and DataByte can have a value of 0 to 0xFF.
void Write_Byte_To_DS1307_RTC(unsigned char Address, unsigned char DataByte)
{
I2C_Start(); // Start i2c communication

// Send i2c address of DS1307 with write command
while(I2C_Write_Byte(RTC_ADDRESS + 0) == 1)// Wait until device is free
{ I2C_Start(); }

I2C_Write_Byte(Address); // Write Address byte
I2C_Write_Byte(DataByte); // Write data byte
I2C_Stop(); // Stop i2c communication
}



// Function Purpose: Read_Byte_From_DS1307_RTC reads a single byte from given address
// Address can have any value fromm 0 to 0xFF.
unsigned char Read_Byte_From_DS1307_RTC(unsigned char Address)
{
unsigned char Byte = 0; // Variable to store Received byte

I2C_Start(); // Start i2c communication

// Send i2c address of DS1307 with write command
while(I2C_Write_Byte(RTC_ADDRESS + 0) == 1)// Wait until device is free
{ I2C_Start(); }

I2C_Write_Byte(Address); // Write Address byte
I2C_ReStart(); // Restart i2c

// Send i2c address of DS1307 RTC with read command
I2C_Write_Byte(RTC_ADDRESS + 1);

Byte = I2C_Read_Byte(); // Read byte from EEPROM

I2C_Send_NACK(); // Give NACK to stop reading
I2C_Stop(); // Stop i2c communication
// Send start bit and then stop bit to stop transmission
Set_SDA_Low; // Make SDA Low
delay(1); // Half bit delay
Set_SDA_High; // Make SDA high
delay(1); // Half bit delay

return Byte;                // Return the byte received from 24LC64 EEPROM
}



// Function Purpose: Write_Bytes_To_DS1307_RTC writes mulitple bytes from given starting address.
// Address can have any value fromm 0 to 0xFF and pData is pointer to the array
// containing NoOfBytes bytes in it. NoOfBytes is the number of bytes to write.
void Write_Bytes_To_DS1307_RTC(unsigned char Address,unsigned char* pData,unsigned char NoOfBytes)
{
unsigned int i;

I2C_Start(); // Start i2c communication

// Send i2c address of DS1307 with write command
while(I2C_Write_Byte(RTC_ADDRESS + 0) == 1)// Wait until device is free
{ I2C_Start(); }

I2C_Write_Byte(Address); // Write Address byte

for(i=0;i<NoOfBytes;i++) // Write NoOfBytes
I2C_Write_Byte(pData[i]); // Write data byte

I2C_Stop(); // Stop i2c communication
}




// Function Purpose: Read_Bytes_From_DS1307_RTC reads a NoOfBytes bytes from given starting address.
// Address can have any value fromm 0 to 0xFF. NoOfBytes is the number of bytes to write.
// Read bytes are returned in pData array.
void Read_Bytes_From_DS1307_RTC(unsigned char Address, unsigned char* pData, unsigned int NoOfBytes)
{
unsigned int i;

I2C_Start(); // Start i2c communication

// Send i2c address of DS1307 with write command
while(I2C_Write_Byte(RTC_ADDRESS + 0) == 1)// Wait until device is free
{ I2C_Start(); }

I2C_Write_Byte(Address); // Write Address byte
I2C_ReStart(); // Restart i2c

// Send i2c address of DS1307 RTC with read command
I2C_Write_Byte(RTC_ADDRESS + 1);

pData[0] = I2C_Read_Byte(); // Read First byte from EEPROM

for(i=1;i<NoOfBytes;i++) // Read NoOfBytes
{
I2C_Send_ACK(); // Give Ack to slave to start receiving next byte
pData[i] = I2C_Read_Byte(); // Read next byte from EEPROM
}

I2C_Send_NACK(); // Give NACK to stop reading
// Send start bit and then stop bit to stop transmission
Set_SDA_Low; // Make SDA Low
delay(1); // Half bit delay
Set_SDA_High; // Make SDA high
delay(1); // Half bit delay // Stop i2c communication
}




// Function Purpose: Set_DS1307_RTC_Time sets given time in RTC registers.
// Mode can have a value AM_Time or PM_Time or TwentyFourHoursMode only.
// Hours can have value from 0 to 23 only.
// Mins can have value from 0 to 59 only.
// Secs can have value from 0 to 59 only.
void Set_DS1307_RTC_Time(unsigned char Mode, unsigned char Hours, unsigned char Mins, unsigned char Secs)
{
// Convert Hours, Mins, Secs into BCD
RTCArray[0] = (((unsigned char)(Secs/10))<<4)|((unsigned char)(Secs%10));
RTCArray[1] = (((unsigned char)(Mins/10))<<4)|((unsigned char)(Mins%10));
RTCArray[2] = (((unsigned char)(Hours/10))<<4)|((unsigned char)(Hours%10));

switch(Mode) // Set mode bits
{
case AM_Time: RTCArray[2] |= 0x40; break;
case PM_Time: RTCArray[2] |= 0x60; break;

default: break; // do nothing for 24HoursMode
}

// WriteRTCArray to DS1307
Write_Bytes_To_DS1307_RTC(0x00, RTCArray, 3);
}





// Function Purpose: Get_DS1307_RTC_Time returns current time from RTC registers.
// Pointer to RTCArray is returned, in this array
// RTCArray[3] can have a value AM_Time or PM_Time or TwentyFourHoursMode only.
// RTCArray[2] (Hours byte) can have value from 0 to 23 only.
// RTCArray[1] (Mins byte) can have value from 0 to 59 only.
// RTCArray[0] (Secs byte) can have value from 0 to 59 only.
unsigned char* Get_DS1307_RTC_Time(void)
{
// Read Hours, Mins, Secs register from RTC
Read_Bytes_From_DS1307_RTC(0x00, RTCArray, 3);

// Convert Secs back from BCD into number
Temp = RTCArray[0];

RTCArray[0] = ((Temp&0x7F)>>4)*10 + (Temp&0x0F);

// Convert Mins back from BCD into number
Temp = RTCArray[1];
RTCArray[1] = (Temp>>4)*10 + (Temp&0x0F);

// Convert Hours back from BCD into number
if(RTCArray[2]&0x40) // if 12 hours mode
{
if(RTCArray[2]&0x20) // if PM Time
RTCArray[3] = PM_Time;
else // if AM time
RTCArray[3] = AM_Time;

Temp = RTCArray[2];
RTCArray[2] = ((Temp&0x1F)>>4)*10 + (Temp&0x0F);
}
else // if 24 hours mode
{
Temp = RTCArray[2];
RTCArray[2] = (Temp>>4)*10 + (Temp&0x0F);
RTCArray[3] = TwentyFourHoursMode;
}


return RTCArray;
}





// Function Purpose: Set_DS1307_RTC_Date sets given date in RTC registers.
// Year can have a value from 0 to 99 only.
// Month can have value from 1 to 12 only.
// Date can have value from 1 to 31 only.
// Day can have value from 1 to 7 only. Where 1 means Monday, 2 means Tuesday etc.
void Set_DS1307_RTC_Date(unsigned char Date, unsigned char Month, unsigned char Year, unsigned char Day)
{
// Convert Year, Month, Date, Day into BCD
RTCArray[0] = (((unsigned char)(Day/10))<<4)|((unsigned char)(Day%10));
RTCArray[1] = (((unsigned char)(Date/10))<<4)|((unsigned char)(Date%10));
RTCArray[2] = (((unsigned char)(Month/10))<<4)|((unsigned char)(Month%10));
RTCArray[3] = (((unsigned char)(Year/10))<<4)|((unsigned char)(Year%10));

// WriteRTCArray to DS1307
Write_Bytes_To_DS1307_RTC(0x03, RTCArray, 4);
}




// Function Purpose: Get_DS1307_RTC_Date returns current date from RTC registers.
// Pointer to RTCArray is returned, in this array
// RTCArray[3] (Year byte) can have value from 0 to 99 only.
// RTCArray[2] (Month byte) can have value from 1 to 12 only.
// RTCArray[1] (Date byte) can have value from 1 to 31 only.
// RTCArray[0] (Day byte) can have value from 1 to 7 only.
unsigned char* Get_DS1307_RTC_Date(void)
{
// Read Hours, Mins, Secs register from RTC
Read_Bytes_From_DS1307_RTC(0x03, RTCArray, 4);

// Convert Date back from BCD into number
Temp = RTCArray[1];
RTCArray[1] = (Temp>>4)*10 + (Temp&0x0F);

// Convert Month back from BCD into number
Temp = RTCArray[2];
RTCArray[2] = (Temp>>4)*10 + (Temp&0x0F);

// Convert Year back from BCD into number
Temp = RTCArray[3];
RTCArray[3] = (Temp>>4)*10 + (Temp&0x0F);

return RTCArray;
}



// Main function
void main()
{
        TRISC = 0X00;
        InitLCD(); // Initialize LCD
InitI2C(); // Initialize i2c pins

// Set initial time
Set_DS1307_RTC_Time(PM_Time, 11, 59, 50); // Set time 12:40:59 AM

// Set initial date
Set_DS1307_RTC_Date(11, 11, 11, Fri); // Set 31-03-2014 @ Monday

while(1)
{
// Display RTC time on first line of LCD
DisplayTimeToLCD(Get_DS1307_RTC_Time());
               

// Display RTC date on second line of LCD
DisplayDateOnLCD(Get_DS1307_RTC_Date());

delay(5000); // 1 second delay

        }
}

PIC16F877 GRAPHIC LCD INTERFACE

#include<pic.h>
#include<htc.h>
#include "Picture.h"
#define __PIC16F877_H


// LCD Port and Connection Configurations

#define Output 0

#define ConfigureLCDPINsDirection(Value)    (TRISD = Value,             \
                                             TRISCbits.TRISC3 = Value,  \
                                             TRISCbits.TRISC4 = Value,  \
                                             TRISCbits.TRISC5 = Value,  \
                                             TRISCbits.TRISC6 = Value,  \
                                             TRISCbits.TRISC7 = Value)

#define DataBusLCD      PORTD
#define RegisterSelect  PORTCbits.RC3
#define EnableLCD       PORTCbits.RC4
#define ChipSelect1     PORTCbits.RC5
#define ChipSelect2     PORTCbits.RC6
#define ResetLCD        PORTCbits.RC7

#define Enable  1
#define Disable 0

#define Command 0
#define Data    1

#define DisplayON        63
#define DisplayStartLine 192

#define LeftChip    1
#define RightChip   2
#define BothChip    3

// LCD Index addresses
#define Index0  0x40
#define Index1  0x50
#define Index2  0x60
#define Index3  0x70
#define Index4  0x80
#define Index5  0x90
#define Index6  0xA0
#define Index7  0xB0

// LCD Pages address
#define Page0   0xB8
#define Page1   0xB9
#define Page2   0xBA
#define Page3   0xBB
#define Page4   0xBC
#define Page5   0xBD
#define Page6   0xBE
#define Page7   0xBF

#define ColourON    1
#define ColourOFF   0


void delay(unsigned int i)
{
while(i--);
}

    void InitializeGraphicalLCD(void);
    void ChipSelection(unsigned char Chip);
    void ToggleEnablePin(void);
    void WriteCommandToLCD(unsigned char CommandToLCD, unsigned char SelectChip);
    void WriteDataToLCD(unsigned char DataToLCD, unsigned char SelectChip);
    void WriteAddressToLCD(unsigned char AddressX, unsigned char AddressY, unsigned char SelectChip);
    void ClearScreen(void);
    void FillScreen(void);
    void DisplayPicture(const unsigned char *PtrArray);







void InitializeGraphicalLCD(void)
{
    ConfigureLCDPINsDirection(Output);
    RegisterSelect = Command;
    EnableLCD = Enable;
    DataBusLCD = Disable;
    ChipSelect1 = Disable;
    ChipSelect2 = Disable;
    ResetLCD = Enable;
    delay(1);

    ResetLCD = Disable;                                 // Normal Operation
    WriteCommandToLCD(DisplayON, BothChip);             //  Sending 63 to both chip CS1 and CS2
    WriteCommandToLCD(DisplayStartLine, BothChip);      //  Sending 192 to both chip CS1 and CS2
    ClearScreen();
}

void ChipSelection(unsigned char Chip)
{
    if (Chip == 1)
    {
        ChipSelect1 = Enable;
        ChipSelect2 = Disable;
    }
    else if (Chip == 2)
    {
        ChipSelect1 = Disable;
        ChipSelect2 = Enable;
    }
    else if (Chip == 3)
    {
        ChipSelect1 = Enable;
        ChipSelect2 = Enable;
    }
}

void ToggleEnablePin(void)
{
    delay(1);
    EnableLCD = Enable;
    delay(1);
    EnableLCD = Disable;
}

void WriteCommandToLCD(unsigned char CommandToLCD, unsigned char SelectChip)
{

    // sending data to LCD.
    ChipSelection(SelectChip);
    RegisterSelect = Command;
    DataBusLCD = CommandToLCD;
    ToggleEnablePin();
}

void WriteDataToLCD(unsigned char DataToLCD, unsigned char SelectChip)
{

    // sending data to LCD.
    ChipSelection(SelectChip);
    RegisterSelect = Data;
    DataBusLCD = DataToLCD;
    ToggleEnablePin();
}

void WriteAddressToLCD(unsigned char AddressX, unsigned char AddressY, unsigned char SelectChip)
{
    // sending X address.
    WriteCommandToLCD(AddressX, SelectChip);

    // sending Y address.
    WriteCommandToLCD(AddressY, SelectChip);
}

void ClearScreen(void)
{
    unsigned char X = 0, Y = 0, Page = 0;

    Page = Page0;
    for (X = 0; X < 8; X++)
    {
        WriteAddressToLCD(Page++, Index0, BothChip);
        for (Y = 0; Y < 64; Y++)
            WriteDataToLCD(0x00, BothChip);
    }

}

void FillScreen(void)
{
    unsigned char X = 0, Y = 0, Page = 0;

    Page = Page0;
    for (X = 0; X < 8; X++)
    {
        WriteAddressToLCD(Page++, Index0, BothChip);
        for (Y = 0; Y < 64; Y++)
            WriteDataToLCD(0xFF, BothChip);

    }
}

void DisplayPicture(const unsigned char *PtrArray)
{
    unsigned char X = 0, Y = 0, Page = 0;

    Page = Page0;
    for (X = 0; X < 8; X++)
    {
        WriteAddressToLCD(Page, Index0, LeftChip);
        for (Y = 0; Y < 64; Y++)
            WriteDataToLCD(*PtrArray++, LeftChip);

        WriteAddressToLCD(Page++, Index0, RightChip);
        for (Y = 0; Y < 64; Y++)
            WriteDataToLCD(*PtrArray++, RightChip);
    }
}




int main() {

    InitializeGraphicalLCD();
  //FillScreen();
    ClearScreen();
    DisplayPicture(Picture1);
   
    while(1)
    {
    }

    return 0;
}






//**************************************PICTURE.H******************//




#ifndef PICTURE_H
#define PICTURE_H

#ifdef __cplusplus
extern "C" {
#endif


const unsigned char Picture1 [] ={ /* 0X22,0X01,0X80,0X00,0X40,0X00, */
0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,
0X00,0X00,0X00,0X00,0X00,0X00,0XC0,0XF8,0XFC,0XE0,0X00,0X00,0X00,0X00,0X00,0X00,
0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,
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0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,
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0XC0,0XF8,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFC,0XE0,
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0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,
0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0XC0,0XF8,0XFF,
0XFF,0X3F,0X1F,0X8F,0XCF,0XE7,0XF3,0XF1,0XF9,0XF9,0XF9,0XF8,0XF9,0XF1,0XF3,0X87,
0X1F,0XF8,0XE0,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,
0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,
0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,
0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,
0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,
0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,
0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0XC0,0XF8,0X3F,0X0F,0XC3,0XF1,
0XF8,0XFE,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0X7F,0X3F,0X3F,0X3F,0X3F,0X7F,0X7F,
0X00,0XFF,0XFF,0XFF,0XF8,0XE0,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,
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0X00,0X00,0X00,0X00,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0X7F,0X7F,0X7F,0X7F,0X7F,
0X7F,0X7F,0X7F,0X7F,0X7E,0X00,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0X00,0X00,0X00,0X00,
0X00,0XFF,0X7F,0X7F,0X7F,0X7F,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0X7F,0X7F,0X7F,
0X7F,0X7F,0X00,0X00,0X00,0X80,0XF0,0XFC,0XFE,0XFF,0XFF,0XFF,0XFF,0XFE,0XFC,0XE0,
0X00,0X00,0X00,0X00,0X00,0X00,0X00,0XC0,0XF8,0X3F,0X07,0XF0,0XFC,0XFF,0XFF,0XFF,
0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0X03,0X00,0X00,0X00,0X00,0X80,0XE0,0XFC,0X1F,
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0XF0,0XF0,0XF0,0X00,0X00,0X00,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0X00,0X00,0X00,0X00,
0X00,0X00,0X00,0X00,0X00,0X00,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0X00,0X00,0X00,0X00,
0X00,0X00,0XC0,0XF0,0XFE,0XFF,0XFF,0XFF,0XFF,0X7F,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,
0X00,0X00,0X00,0X00,0XC0,0XF0,0XFE,0XFF,0XFF,0X00,0X3F,0XFF,0XFF,0XFF,0XFF,0XFF,
0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0X78,0X20,0XB0,0XB8,0X9E,0X87,0X81,0XC0,0XE0,
0XF8,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XF8,0XC0,0X00,0X00,0X00,0X00,
0X00,0X00,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0X00,0X03,0X0F,0X7F,0XFF,0XFF,0XFF,0XFF,
0XFC,0XF0,0X80,0X00,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0X07,0X07,0X07,0X07,0X07,0X07,
0X07,0X07,0X07,0X00,0X00,0X00,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0X00,0X00,0X00,0X00,
0X00,0X00,0X00,0X00,0X00,0X00,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0X00,0X00,0X00,0XE0,
0XFC,0XFF,0XFF,0XFF,0XFF,0X7F,0X1F,0X07,0X00,0X00,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,
0X00,0X80,0XF0,0XFE,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFC,0XF1,0XF3,0XE7,0XC7,0XCF,
0XC7,0XE7,0XE7,0XF3,0XF1,0XF9,0XFC,0XFC,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,
0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XF8,0XC0,0X00,
0X00,0X00,0XFF,0XFF,0XFF,0XFF,0XFF,0X7F,0X00,0XFE,0XFE,0XFE,0XFF,0XFF,0XFF,0XFF,
0XFF,0X7F,0X3F,0X02,0X3F,0X7F,0XFF,0XFF,0XFF,0XFF,0XFE,0XFE,0XFE,0XFE,0XFE,0XFE,
0XFE,0XFE,0XFE,0XFE,0X7C,0X00,0X3F,0XFF,0XFF,0XFF,0XFF,0XFF,0XFE,0XFE,0XFE,0XFE,
0XFE,0XFE,0XFE,0XFE,0XFE,0X00,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0X00,0X00,0X1F,0X7F,
0XFF,0XFF,0XFF,0XFF,0XFF,0XFE,0XFE,0XFE,0X00,0X00,0XFF,0XFF,0XFF,0XFF,0XFF,0X7F,
};




#ifdef __cplusplus
}
#endif

#endif /* PICTURE_H */


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

PIC16F1518 LCD INTERFACE BY TRANSISTOR LOGIC

#include<pic.h>
#include<htc.h>
#include<stdio.h>
#define __PIC16F1518_H
#define _XTAL_FREQ   16000000
#define RS LATB2
#define EN LATB4
void cmd(unsigned char c);

__CONFIG( FOSC_INTOSC & WDTE_OFF & PWRTE_ON & CP_OFF & BOREN_ON & LVP_OFF);

void msdelay(unsigned int time)
{
 unsigned int i=0,j=0;

 for(i=0;i<=time;i++)
   for(j=0;j<=3000;j++);
}

/* function of simple delay*/
void delay(unsigned int i)
{
   while(i)
      i--;
}



/*to blink cursor*/
void lcd_cursorblink(void)
{
   cmd(0x0D);
}



/*to off cursorblinking*/
void lcd_cursorOff(void)
{
   cmd(0x0C);
}



void lcd_init()
{
  cmd(0x03);    //lcd reset cmds
  msdelay(1);
  cmd(0x02);    //lcd reset cmds
  msdelay(1);
  cmd(0x28);    //2 lines 5x7 matrix
  msdelay(1);
  cmd(0x0C);    //display on,cursor off,blink off
  msdelay(1);
  cmd(0x01);    //clear display
  msdelay(1);
  cmd(0x06);    //entry mode, set increment
  msdelay(1);
}


void dat (unsigned char data1)
{
    data1=~data1;
    unsigned char l,h;
    h = data1 & 0xF0;
    l = data1 << 4;

    delay(4);
    RS=0;
    delay(4);
    PORTC = 0XF0;
    delay(4);
    PORTC = h;   // Write Upper nibble of data
    delay(4);
    EN=0;
    delay(4000);
    EN=1;
    delay(4);
    PORTC = 0XF0;  // Make Data pins zero
    delay(4);
    PORTC = l;   // Write Lower nibble of data
    delay(4);
    EN=0;
    delay(4000);
    EN=1;

}



void cmd(unsigned char command)
{

    command =~ command;
    unsigned char l,h;

    delay(4);
    RS=1;
    delay(4);
    h = command&0xF0;
    l=command<<4;

    PORTC=0xf0;
    delay(4);
    PORTC=h;
    delay(4);
    EN=0;
    delay(4000);
    EN=1;


    delay(4);
    PORTC=0xf0;
    delay(4);
    PORTC=l;
    delay(4);
    EN=0;
    delay(4000);
    EN=1;
}








void string(unsigned char *p)
{
    while(*p!='\0')
    {
        //delay(20000);
        dat(*p);
        p++;
   }
}






int main()
{
    TRISB = 0x00;
    TRISC = 0x00;
    lcd_init();
    string ("EMBEDDED_LAB");

   
    while(1)
    {
    LATB6 = 1;
    delay(4);
    LATB6 = 0;
    delay(4);
    }
}

PIC16F877A PWM

#include<pic.h>
#include<htc.h>
#define __PIC16F877AH
#define _XTAL_FREQ   2000000

__CONFIG(PWRTE_ON & FOSC_HS & LVP_OFF & WDTE_OFF);

unsigned int a=0;

void InitPWM(void);
void SetPWMDutyCycle(unsigned int l);

void delay(unsigned int i)
{
while(i--);
}



void InitPWM(void)
{
TRISC2  = 0;            // Make CCP1 pin as output
CCP1CON = 0x0C;         // Configure CCP1 module in PWM mode

PR2   = 0xFF;           // Configure the Timer2 period
T2CON = 0x01;           // Set Prescaler to be 4, hence PWM frequency is set to 4.88KHz.

SetPWMDutyCycle(0);     // Intialize the PWM to 0 duty cycle

T2CON |= 0x04;          // Enable the Timer2, hence enable the PWM.
}



void SetPWMDutyCycle(unsigned int l) // Give a value in between 0 and 1024 for DutyCycle
{
CCPR1L   = l>>2;         // Put MSB 8 bits in CCPR1L
CCP1CON &= 0xCF;                 // Make bit4 and 5 zero
CCP1CON |= (0x30&(l<<4));   // Assign Last 2 LSBs to CCP1CON
}

void main(void)
{
InitPWM();

while(1)
{
     SetPWMDutyCycle(a);   //50% duty cycle
     a++;
     if(a>1000)
      a=0;
}
}

PIC16F1518 4ADC VALUE ON LCD PROJECT

#include<pic.h>
#include<htc.h>
#include<stdio.h>
#define __PIC16F1518_H
#define _XTAL_FREQ   16000000

__CONFIG( FOSC_INTOSC & WDTE_OFF & PWRTE_OFF & CP_OFF & BOREN_ON & LVP_OFF );
unsigned char z[40],z1[40],z2[40],z3[40];
unsigned int v,t,w,w1,w2,w3;



void delay(unsigned int i)
{
while(i--);
}



void cmd(unsigned char c)
{
unsigned int l,h;
l=c &0X0F;
h=c>>4;


PORTB=h|0X40;
delay(20);
PORTB=h|0X00;

PORTB=l|0X40;
delay(20);
PORTB=l|0X00;
}



void dat (unsigned char c)
{
unsigned int l,h;
l=c &0X0F;
h=c>>4;

PORTB=h|0X50;
delay(20);
PORTB=h|0X10;

PORTB=l|0X50;
delay(20);
PORTB=l|0X10;
}



void lcd_init()
{
cmd(0x02);
delay(100);
cmd(0x28);
delay(100);
cmd(0x01);
delay(100);
cmd(0x80);
delay(100);
cmd(0x0e);
delay(100);
    cmd(0x0c);
delay(100);
}



void string(unsigned char *p)
{
while(*p!='\0')
{
dat(*p);
p++;
     
}
}



int adc(unsigned char ch)
{
unsigned int x;
TRISA=0XFF;
TRISB=0X00;
TRISC=0XFC;
ANSELA=0x0F;
ADCON0=(0x01)|ch;
ADCON1=0XF0;
delay(100);
GO_nDONE=1;
while(GO_nDONE);
x=(ADRESL+(ADRESH*255));
return x;
}




int main()
{
//LATB = 0x00;
int i=0;
TRISB=0x00;
lcd_init();
while(1)

{
            w=adc(0x00);
            delay(100);
            w1=adc(0x04);
            delay(100);
            w2=adc(0x08);
            delay(100);
            w3=adc(0x0C);

            v=((w*5)/1023);
t=((w*5)/10.24);
sprintf(z,"a1=%3d v=%2dV t=%3d'c|",w,v,t);
cmd(0x80);
i=0;
while(z[i]!='\0')
{
dat(z[i]);
i++;
}
 
            v=((w1*5)/1023);
t=((w1*5)/10.24);
sprintf(z1,"a2=%3d v=%2dV t=%3d'c|",w1,v,t);
cmd(0xc0);
i=0;
while(z1[i]!='\0')
{
dat(z1[i]);
i++;
}
            v=((w2*5)/1023);
t=((w2*5)/10.24);
sprintf(z2,"a3=%3d v=%2dV t=%3d'c",w2,v,t);
cmd(0x95);
i=0;
while(z2[i]!='\0')
{
dat(z2[i]);
i++;
}
            v=((w3*5)/1023);
t=((w3*5)/10.24);
sprintf(z3,"a4=%3d v=%2dV t=%3d'c",w3,v,t);
cmd(0xd5);
i=0;
while(z3[i]!='\0')
{
dat(z3[i]);
i++;
}
        }
}