GSM sim900 to PIC16F877A

Code C - [expand]
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// Picc-Lite header file for processor special function registers and peripherals
#include <pic.h>
#include <htc.h>
#include <stdlib.h>
#include "uartUJ.h"   //Uart Header file invoked
#include "lcdUJ.h"
 
void WriteToUsart(void);
void ReadPortsValues(void);
void InitializePorts(void);
 
#define _XTAL_FREQ 4000000 //4MHz Oscillator
 
#define cr  0x0D    //cursor return to home position
#define ff  0x0C    //form feed
 
// Configuration bit settings
//__CONFIG(XT & WDTDIS & PWRTEN & BORDIS & LVPDIS & DUNPROT & WRTEN & DEBUGDIS & UNPROTECT);
 
// Local Subroutine and Function declarations
void adc_init()
{
    ADCON1=0B10000000;         //Right just, Fosc/8 conversion clock, Vref=5V
    ADCON0=0B01000000;        //Fosc/8 conv_clock for proper sampling of 1.6uS.
    ADON=1;                  //Turning on the ADC module.
}
 
int adc_read()
{
    int x=0;
    GO=1;
    while(GO)continue;
    x=ADRESH<<8;    //Store 8-bit ADRESH and shift it 8 times so that it sits on bit8 to bit15
    x =x|ADRESL;   //Join ADRESL to ADRESH and store in Register x to form a 16-bit register
    return x;     //return the value of new register x to main loop for further processing and display.
}
 
/*const unsigned char mes5[]= "AT\r";
const unsigned char mes6[]= "AT+CMGF=1\r";
const unsigned char mes7[]= "AT+CMGS=\"+27797185004\"\r";
const unsigned char mes8[]="0x01A";*/
 
 
 
//variable declarations
unsigned char Vstr[5];
int result,voltage;
 
const unsigned char mes1[]= "AT";
const unsigned char mes2[]= "AT+CMGF=1";
const unsigned char mes3[]= "AT+CMGS=\"+27797185004\"";
const unsigned char mes4[]= "JRA has been";
const unsigned char mes5[]="0x1A"; //Send command (ctrl+z)
const unsigned char mes6[]="0x0d"; //Enter command
 
//Main Program
void main()
{
    while(!RA4)
        {
            InitializePorts();
            uart_init();
            ReadPortsValues();
        }
}
 
void InitializePorts(void)
{
  PORTA=0;            //Clear Porta
  TRISA=0xFF;         // Make Porta Digital
  adc_init();         // Convert Analog to Digital Converter
}
 
void ReadPortsValues(void)
{
    while(1)
        {
            result=adc_read();
            PORTD=result;
            voltage=result*5;
            itoa(Vstr,voltage,10);
            WriteToUsart();
        }
}
 
// Writting a string on to a screen
void WriteToUsart(void)
{
    //putch(ff);
    putch (cr);      //Take the cursor back to the first position
    uart_putrs(mes1);   //Write message1
    putch('\n');
uart_putrs(mes6);
   putch(cr);       //Take the cursor back to the first position
//  uart_putrs(mes6);
    __delay_ms(2000);
    uart_putrs(mes2);
putch('\n');
    uart_putrs(mes6);
    putch('\n');        //Take cursor to a new line
    putch(cr);      //Take the cursor back to the first position
    __delay_ms(2000);
    uart_putrs(mes3);
 putch('\n');
    uart_putrs(mes6);
    putch('\n');        //Take cursor to a new line
   putch(cr);       //Take the cursor back to the first position
    __delay_ms(2000);
    uart_putrs(mes4);
    __delay_ms(2000);
    putch('\n');
    putch(cr);
//  __delay_ms(2000);
    uart_putrs(mes5);
    putch('\n');
    putch(cr);
    __delay_ms(2000);
}