Problem with receive complete interrupt in AVR studio 4

[Dhruwank Vankawala]

Hey, frds

i am trying to run a code which is related with interfacing of GSM modem with ATMEGA 32.

 

i have done programming on interupt based…..

 

Bt incase of interupt service routine i dint come out of that routine ……………..

 

and the code is not running on both proteus  and  atmega 32 kit………….

 

Here is the reference code for it……….

 

 

#include<avr/io.h>

#ifndef F_CPU
#define F_CPU 11059200UL    // 11.0592MHz clock speed #endif
#endif

#include<util/delay.h>
#include<avr/interrupt.h>

 

#define LCD_PRT PORTC
#define LCD_PIN PINC
#define LCD_DDR DDRC
#define LCD_RS 0
#define LCD_RW 1
#define LCD_EN 2

unsigned char x,abc=0,z,ch=0,i,st,flag,enter=0;
char msg[150];
char cmti[]=”+CMTI”;

/*typedef struct bitfield
{
unsigned char bit1:1;
}bitfield;

bitfield flag;*/

void UART_init()
{
 UCSRB = ((1<<TXEN)|(1<<RXEN)|(1<<RXCIE));  // Enable UART   receiver and transmitter
    UCSRC = (1<<UCSZ1) | (1<<UCSZ0) | (1<<URSEL);
 UBRRL = 0x47;
}

 

void tx(unsigned char b)
{
 while(!(UCSRA & (1<<UDRE)));
 UDR = b;
}

void sendSMS(char* z)
{
 unsigned char t;
 for(t=0;z[t] != ‘’;t++)
  {
   tx(z[t]);
  }
}

void lcdcommand(unsigned char cmnd)
{
 LCD_PRT = (LCD_PRT & 0x0F)| (cmnd & 0xF0);
 LCD_PRT &=~(1<<LCD_RS);
 LCD_PRT &=~(1<<LCD_RW);
 LCD_PRT |=(1<<LCD_EN);
 _delay_ms(2);
 LCD_PRT &=~(1<<LCD_EN);
 _delay_ms(2);
 LCD_PRT = (LCD_PRT & 0x0F) | (cmnd<<4);
 LCD_PRT |= (1<<LCD_EN);
 _delay_ms(2);
 LCD_PRT &=~ (1<<LCD_EN);
 _delay_ms(20);
}

void lcddata(unsigned char data)
{
 LCD_PRT = (LCD_PRT & 0x0F) | (data & 0xF0);
 LCD_PRT |= (1<<LCD_RS);
 LCD_PRT &=~ (1<<LCD_RW);
 LCD_PRT |= (1<<LCD_EN);
 _delay_ms(2);
 LCD_PRT &=~ (1<<LCD_EN);
 _delay_ms(2);
 LCD_PRT = (LCD_PRT & 0x0F) | (data << 4);
 LCD_PRT |= (1<<LCD_EN);
 _delay_ms(2);
 LCD_PRT &=~ (1<<LCD_EN);
 _delay_ms(20);
}

void LCD_init()
{
 LCD_DDR = 0xFF;
 LCD_PRT &=~(1<<LCD_EN);
 lcdcommand(0x33);
 lcdcommand(0x32);

 lcdcommand(0x28);
 lcdcommand(0x06);
 lcdcommand(0x0E);
 lcdcommand(0x01);
}

void LCD_print(char * str)
{
 unsigned char i=0;
 while(str!=0)
 {
  lcddata(str);
  i++;
 }
}

ISR (USART_RXC_vect)
{
 st=UDR;
 msg[ch]=st;
 
 if(flag==0)
 {
   if (msg[ch] == ‘K’)
   {
    flag=1;
   }
   ch++;
 }
 
 if(flag==2 && msg[ch]==cmti[ch])
 {
  ch++;
   if(ch==5)
   {
    flag=3;
   }
  
 }
 
 if(flag==4)
  {
   if(msg[ch]==0x0d)
   {
    enter++;
    if(enter==4)
    {
     flag=5;
    }
   }
   ch++;
  }
  
 if(flag==6)
 {
   if (msg[ch] == ‘K’)
   {
    flag=7;
   }
   ch++;
 } 
}

/*ISR (USART_RXC_vect)
{
 z=UDR;
 if(z == ‘K’ || z == ‘k’)
  {
   flag = 1;
  }
}*/

void clear(void)
{
 unsigned char a;
 for(a=0;a<150;a++)
  msg[a]=0x00;
}

int main()
{
 unsigned char i=0;
 flag = 0;
 DDRC = 0xfc;

 UART_init();
 LCD_init();
    sei();

 tx(0x0d);
 tx(0x0a);
 _delay_ms(200);

 sendSMS(“AT”);
 tx(0x0d);
 while (flag!=1){}
 
  LCD_print(“Initialize”); 
  flag=0;
  ch=0;
 
  
 sendSMS(“ATE0”);
 tx(0x0d);
 lcdcommand(0x8a);
 while (flag!=1){}
 
  LCD_print(“.”); 
  flag=0;
  ch=0;
 

 sendSMS(“AT&W”);
 tx(0x0d);
 lcdcommand(0x8b);
 while (flag!=1){}
 
  LCD_print(“.”); 
  flag=0;
  ch=0;
 

 sendSMS(“AT+CMGF=1”);
 tx(0x0d);
 lcdcommand(0x8c);
 while (flag!=1){}
 
  LCD_print(“.”); 
  flag=2;
  ch=0;
 
 _delay_ms(1000);
 lcdcommand(0x01);

while(1)
{
 
 lcdcommand(0x01);
 lcdcommand(0x80);

 if(flag=)
 {
  LCD_print(“AT+CMGR=1”);
  lcdcommand(0x80);
  LCD_print(“Reading Msg”);
  _delay_ms(2000);
  sendSMS(“AT+CMGR=1”);
  tx(0x0d);
  ch=0;
  flag=4; 
 }
 
 if(flag==5)
 {
  lcdcommand(0x01);
  lcdcommand(0x80);
  for(i=63;i<68;i++)
   lcddata(msg);
  _delay_ms(5000);
  
  lcdcommand(0x01);
  lcdcommand(0x80);
  LCD_print(“AT+CMGD=1”);
  sendSMS(“AT+CMGD=1”);
  tx(0x0d);
  ch=0; 
  enter=0;
  flag=6;
 }  
 
 if (flag==7)
 {
  lcdcommand(0x01);
  lcdcommand(0x80);
  LCD_print(“msg deleting”);
  clear();
  _delay_ms(5000);
  ch=0;
  flag=2;
 } 
}
return(0);
}

 

 

Thanx in advance…………..

[Author]

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