terima SMS AVR

//-------------------------------------------------------------------------
void sms_mode(void)
{

while(1)
{

      printf("AT+CMGF=1");
      putchar(0x0D);       // CR

      while(getchar()!= 'K'){};
      while(getchar()!=0x0A){};

      printf("AT+CMGL=");
      putchar('"');
      printf("REC UNREAD");
      putchar('"');
      putchar(0x0D);

      while(getchar()!=0x0A){};
      while(getchar()!=0x0A){};


        a=0;
        do{
        a++;
        cek[a]=getchar();

        }while(cek[a]!=0x0A);

        i=1;
        lcd_gotoxy(0,1);
        while(i<33)
        {
        if(cek[i]==13) break;
        lcd_putchar(cek[i++]);
        //delay_ms(100);
        }

        if(cek[1]=='S' || cek[1]=='s' || cek[1]=='?'){
            sms_status();
        }

        if(cek[1]=='1')
        {
        PORTC.5=1;
        lcd_gotoxy(0,1);
        lcd_puts("Lp1 on ");
        }

        if(cek[1]=='0')
        {
        PORTC.5=0;
        lcd_gotoxy(0,1);
        lcd_puts("Lp1 off");
        }

        if(cek[2]=='1')
        {
        PORTC.7=1;
        lcd_gotoxy(8,1);
        lcd_puts("Lp2 on ");
        }

        if(cek[2]=='0')
        {
        PORTC.7=0;
        lcd_gotoxy(8,1);
        lcd_puts("Lp2 off");
        }
        sms_not();
        delay_ms(1000);

        if(getchar()=='R'&&getchar()=='I')
        { lcd_clear();
        lcd_puts("Incomming call");
        delay_ms(100);
        //mode='R';
            PORTC.5=0;
            PORTC.7=0;
            xdata='-';
            sms_send("Lampu 1 off 2 off");
            delay_ms(2000);
        }


}

}