[AVR] receiving sms algooritm via sim900

[mohammad.habibi]

hello
i want to receive sms via sim900a with atmega 32
whats at command need to recieving sms?
is this correct?

AT+CMGF=1\r
AT+CMGDA=”DEL ALL”
AT+CNMI=0,0
AT+CMGR=1
AT+CMGL=”REC UNREAD”

tnx freinds

 

[pic.programmer]

"AT\r";
"AT+IPR=9600\r";
"AT+CMGF=1\r";
"AT+CPMS="SM","SM","SM"\r";
"AT+CNMI=2,1,0,0,0\r";

above commands once during GSM initialization.

Then when new SMS is received it gives +CMTI: "SM",x response where x is SMS index

you have to then issue "AT+CMGR=x\r"; to read the SMS at index x.

 

[mohammad.habibi]

i worked with avr microcontroller and codevision compler
as you say my code is similar to :

/*******************************************************
AVR Core external Clock frequency: 11.059200 MHz
*******************************************************/
#include <mega16a.h>
#include <alcd.h>
#include <delay.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define ctrl_z 0x1a
#define enter 0x0d
char Masseg[255]={'\0'};
void main(void)
{
char ch;
int i=0,j=0,p=1;
DDRB=0XFF;                      
PORTB=0X00;
DDRA=(1<<DDC7) | (1<<DDC6) | (1<<DDC5) | (1<<DDC4) | (1<<DDC3) | (1<<DDC2) | (1<<DDC1) | (1<<DDC0);
PORTA=(0<<PORTC7) | (0<<PORTC6) | (0<<PORTC5) | (0<<PORTC4) | (0<<PORTC3) | (0<<PORTC2) | (0<<PORTC1) | (0<<PORTC0);
DDRD=(0<<DDD7) | (0<<DDD6) | (0<<DDD5) | (0<<DDD4) | (0<<DDD3) | (0<<DDD2) | (1<<DDD1) | (0<<DDD0);
PORTD=(0<<PORTD7) | (0<<PORTD6) | (0<<PORTD5) | (0<<PORTD4) | (0<<PORTD3) | (0<<PORTD2) | (0<<PORTD1) | (0<<PORTD0);
// USART initialization
// Communication Parameters: 8 Data, 1 Stop, No Parity
// USART Receiver: On
// USART Transmitter: On
// USART Mode: Asynchronous
// USART Baud Rate: 9600
UCSRA=(0<<RXC) | (0<<TXC) | (0<<UDRE) | (0<<FE) | (0<<DOR) | (0<<UPE) | (0<<U2X) | (0<<MPCM);
UCSRB=(0<<RXCIE) | (0<<TXCIE) | (0<<UDRIE) | (1<<RXEN) | (1<<TXEN) | (0<<UCSZ2) | (0<<RXB8) | (0<<TXB8);
UCSRC=(1<<URSEL) | (0<<UMSEL) | (0<<UPM1) | (0<<UPM0) | (0<<USBS) | (1<<UCSZ1) | (1<<UCSZ0) | (0<<UCPOL);
UBRRH=0x00;
UBRRL=0x47;
lcd_init(20);
// *****************************************
printf("AT\r");
delay_ms(600);
printf("AT+IPR=9600\r");
delay_ms(600);
printf("AT+CMGF=1\r");
delay_ms(600);
printf("AT+CPMS="SM","SM","S,"\r");
delay_ms(600);
printf("AT+CNMI=2,1,0,0,0\r");
delay_ms(600);
while(1)
{       
       printf("AT+CMGD=0,4\r\n");
       p=0;
       ch=getchar();
       if( (ch == enter) && ( j==0 || j==1 ))
          j++;
       if( ch == enter && j==2)
        {   
            ch=getchar();
            i=0;
            while(1)
                {
                 ch=getchar();
                 if(ch==enter)
                    {   
                     j=0;  
                     p=1;
                     Masseg[i]='\0';
                     break;
                    }
                 //lcd_putchar(ch);
                 Masseg[i]=ch;
                 i++;
                }        
        }
// ****************  my Masseg is +CMTI: "SM",x ***********************
// now i must decode the x? and write "AT+CMGR=x\r"; ?


}
}

is it right?