gs__.c

remote notice board implementation using GSM source code with schematics are provided

#include<mega8535.h>
#include<delay.h>
#include<string.h>

#define RS PORTA.1
#define RW PORTA.2
#define EN PORTA.3 

#define LCD_DATA PORTC 

unsigned  int flag_get_sms = 0;
unsigned char loop =0;
unsigned char flag = 0;
unsigned char temp,flag1;
unsigned int msgno;
unsigned char recv_num[50];
unsigned char recv_buf[50];

 void lcd_cwrt(unsigned char ch);

 void init_lcd(void)
{

     lcd_cwrt(0x38);       // 2 lines
     lcd_cwrt(0x0E);       // display on ,cursor blinking
     lcd_cwrt(0x01);       //clear display screen
     lcd_cwrt(0x80);      //force cursor to beginning f 1st ine
     lcd_cwrt(0x06);
     delay_ms(5);
}
void lcd_data(unsigned char ch)
{    
        RS = 1;
        LCD_DATA = ch;
        EN = 1;           //E=1;R/W=0;RS=1
        delay_ms(5);                //DELAY
        EN = 0;          //E=0;R/W=0;RS=1
        delay_ms(5);
 }               
 void lcd_cwrt(unsigned char ch)
{    
        RS = 0;
        LCD_DATA = ch;
        EN = 1;          // //E=1;R/W=0;RS=0
        delay_ms(5);
        EN = 0;          //E=0;R/W=0;RS=0
        delay_ms(5);
}
void Clear_Lcd()
{
     lcd_cwrt(0x01); 
     delay_ms(5);
}     
void Lcd_Send_String(unsigned char *str)
 {
        while(*str != '\0')
        {
             lcd_data(*str++);
             delay_ms(2);
        }   
 
 
 }
interrupt[USART_RXC] void Recive_interrupt(void)
{
	temp = UDR;
	flag1 =1;
}


void init_uart(void)
{
	UCSRB = 0x98;
	UCSRC = 0x06;
	UBRRH = 0x00;
	UBRRL = 0x33;
	SREG  = 0x80;
}



void send_uart1(unsigned char data)
{
	UDR = data;
	while((UCSRA & 0x40) == 0);
	UCSRA = 0;
} 




void get_sms(unsigned int num)
{       
	unsigned char *r="AT+CMGR=";
	
        
        
	while(*r)
	{
		send_uart1(*r++);
		delay_ms(2);
	}

	send_uart1(num);
	delay_ms(2);
	send_uart1(13);
	//delay_ms(2);
	flag1 = 0;
	UCSRA = 0;
	do
	{
	
	

		while(flag1 != 1);
		flag1 = 0;
		UCSRA = 0;
	}while(temp != ',');
	
	loop = 0;
	//UCSR0A = 0;
	
	
	while(flag1 != 1);
	
	while(temp != 10)
	{
		
		recv_num[loop++] = temp;

		flag1 = 0;
		UCSRA = 0;
		while(flag1 != 1);

	}

	flag1 = 0;
	loop = 0;
	UCSRA = 0;
	
	
	while(flag1 != 1);
	
	while(temp != 13)
	{
		
		recv_buf[loop++] = temp;
                //LCD_DAT(recv_buf[loop]);
                //loop++;
		flag1 = 0;
		UCSRA = 0;
		while(flag1 != 1);

	}
	flag1 = 0;
	UCSRA = 0;   
	
	recv_buf[loop] = '\0'; 
	
	flag1 = 0;
	UCSRA = 0;	
	
        flag_get_sms = 1;

}
void wait_for_sms(void)
{
	if(flag == 1)
	{
		flag = 0;

		while(flag == 0)
		{
			flag1 =0;
			UCSRA = 0;
			while(flag1 != 1);

			if(temp == '+')
			{
				flag1 = 0;
				UCSRA = 0;
			
				while(flag1 != 1);
					
					if(temp == 'C')
					{
						flag1 = 0;
						UCSRA = 0;
						
						while(flag1 != 1);
							if(temp == 'M')
							{
								flag1 = 0;
								UCSRA = 0;
						
								while(flag1 != 1);

									if(temp == 'T')
									{
										flag1 = 0;
										UCSRA = 0;
						
										while(flag1 != 1);

											if(temp == 'I')
											 {
												
												for(loop =0;temp != ',';loop++)
												{
													flag1 = 0;
													UCSRA = 0;
													while(flag1 != 1);
												}
												flag1 = 0;
												UCSRA = 0;

												while(flag1 != 1);
												msgno = temp;
												flag = 1;
												
												flag1 = 0;
												UCSRA =0;
											}
											else
											{
												flag1 = 0;
												UCSRA = 0;
											}												
						
									  }			
                                      else
									  {
												flag1 = 0;
												UCSRA = 0;
									 }

		                      }

                               	else
								{
									flag1 = 0;
									UCSRA = 0;
								}
                         }
						 	else
							{
								flag1 = 0;
								UCSRA = 0;
							}
                    }
					else
					 {
							flag1 = 0;
							UCSRA = 0;
				     }

				}

        }
        
}


void del_sms(unsigned char num)
{
	while(num != '0')
	{
		unsigned char *d ="AT+CMGD=";
		
		while(*d)
		{
			send_uart1(*d++);
			delay_ms(2);
		}

		send_uart1(num--);
		send_uart1(13);
		delay_ms(2);
	}

}
 
void main()
{  
	//char *ph="9849111633";
        //char *p1="ON";  
	//char *p2="OFF";
        //int i=0;
	DDRA = 0xFF;
	PORTA = 0x00;
        DDRC = 0xFF;
        PORTC = 0x00;
	
	init_uart(); 
	init_lcd();
	//delay_ms(100); 
	
        
	
        while(1)
	{
        PORTA = 0x01;
	flag1 = 0;
	UCSRA = 0;
	flag = 1;
	//init_LCD();
	
	wait_for_sms();
	
	get_sms(msgno);
	 if(flag_get_sms == 1)
	 {
	        flag_get_sms = 0;
	        Clear_Lcd();
	        Lcd_Send_String(recv_buf);   
                delay_ms(2);
         } 
         
	del_sms(msgno);
	
	//while(1);
}
}