using uart of pic16f877a to transfer sensor values
#define _XTAL_FREQ 16000000
#define RS RD2
#define EN RD3
#define D4 RD4
#define D5 RD5
#define D6 RD6
#define D7 RD7
#include <xc.h>
#pragma config FOSC = HS // Oscillator Selection bits (HS oscillator)
#pragma config WDTE = OFF // Watchdog Timer Enable bit (WDT disabled)
#pragma config PWRTE = ON // Power-up Timer Enable bit (PWRT enabled)
#pragma config BOREN = ON // Brown-out Reset Enable bit (BOR enabled)
#pragma config LVP = OFF // Low-Voltage (Single-Supply) In-Circuit Serial Programming Enable bit (RB3 is digital I/O, HV on MCLR must be used for programming)
#pragma config CPD = OFF // Data EEPROM Memory Code Protection bit (Data EEPROM code protection off)
#pragma config WRT = OFF // Flash Program Memory Write Enable bits (Write protection off; all program memory may be written to by EECON control)
#pragma config CP = OFF // Flash Program Memory Code Protection bit (Code protection off)
//LCD Functions Developed by Circuit Digest.
void Lcd_SetBit(char data_bit) //Based on the Hex value Set the Bits of the Data Lines
{
if(data_bit& 1)
D4 = 1;
else
D4 = 0;
if(data_bit& 2)
D5 = 1;
else
D5 = 0;
if(data_bit& 4)
D6 = 1;
else
D6 = 0;
if(data_bit& 8)
D7 = 1;
else
D7 = 0;
}
void Lcd_Cmd(char a)
{
RS = 0;
Lcd_SetBit(a); //Incoming Hex value
EN = 1;
__delay_ms(4);
EN = 0;
}
Lcd_Clear()
{
Lcd_Cmd(0); //Clear the LCD
Lcd_Cmd(1); //Move the curser to first position
}
void Lcd_Set_Cursor(char a, char b)
{
char temp,z,y;
if(a== 1)
{
temp = 0x80 + b - 1; //80H is used to move the curser
z = temp>>4; //Lower 8-bits
y = temp & 0x0F; //Upper 8-bits
Lcd_Cmd(z); //Set Row
Lcd_Cmd(y); //Set Column
}
else if(a== 2)
{
temp = 0xC0 + b - 1;
z = temp>>4; //Lower 8-bits
y = temp & 0x0F; //Upper 8-bits
Lcd_Cmd(z); //Set Row
Lcd_Cmd(y); //Set Column
}
}
void Lcd_Start()
{
Lcd_SetBit(0x00);
for(int i=1065244; i<=0; i--) NOP();
Lcd_Cmd(0x03);
__delay_ms(5);
Lcd_Cmd(0x03);
__delay_ms(11);
Lcd_Cmd(0x03);
Lcd_Cmd(0x02); //02H is used for Return home -> Clears the RAM and initializes the LCD
Lcd_Cmd(0x02); //02H is used for Return home -> Clears the RAM and initializes the LCD
Lcd_Cmd(0x08); //Select Row 1
Lcd_Cmd(0x00); //Clear Row 1 Display
Lcd_Cmd(0x0C); //Select Row 2
Lcd_Cmd(0x00); //Clear Row 2 Display
Lcd_Cmd(0x06);
}
void Lcd_Print_Char(char data) //Send 8-bits through 4-bit mode
{
char Lower_Nibble,Upper_Nibble;
Lower_Nibble = data&0x0F;
Upper_Nibble = data&0xF0;
RS = 1; // => RS = 1
Lcd_SetBit(Upper_Nibble>>4);
EN = 1;
for(int i=21304830; i<=0; i--) NOP();
//__delay_ms(2);
EN = 0;
Lcd_SetBit(Lower_Nibble); //Send Lower half
EN = 1;
for(int i=21304830; i<=0; i--) NOP();
// __delay_ms(2);
EN = 0;
}
void Lcd_Print_String(char *a)
{
int i;
for(i=0;a[i]!='\0';i++)
Lcd_Print_Char(a[i]);
__delay_ms(2);//Split the string using pointers and call the Char function
}
void adcinitialize()
{
ADCON0=0X00;
ADCON1=(1<<7);
}
int AnalogRead(int a)
{
ADCON0=((1<<0)|(a<<3));
__delay_ms(2);
GO=1;
while(GO_DONE==1);
return ((ADRESH<<8)+ADRESL);
}
void uarton(int uartrate)
{
TRISC=0X80;
TXSTA=(1<<5);
SPBRG=((16000000)/(64*uartrate))-1;
}
void uarttransmit(int data)
{
while(TXIF==0);
TXIF=0;
TXREG= data;
}
int main()
{
int adc=0;
float volt;
int j=0,f=0,g=0,h=0,i=0;
TRISD = 0x00;
Lcd_Start();
adcinitialize();
uarton(9600);
adc=(AnalogRead(0));
while(1)
{
adc=(AnalogRead(0));
volt= (adc*5000)/1024;
i=volt*1000;
j=(adc/1000)%10;
f=(adc/100)%10;
g=(adc/10)%10;
h=(adc/1)%10;
Lcd_Clear();
Lcd_Set_Cursor(1,1);
Lcd_Print_String("DIGITALvalue");
Lcd_Set_Cursor(2,1);
Lcd_Print_Char(j+'0') ;
Lcd_Print_Char(f+'0');
Lcd_Print_Char(g+'0');
Lcd_Print_Char(h+'0');
__delay_ms(10);
//uarttransmit( volt);
}
uarttransmit(adc);
return 0;
}