Sending message from AVR atmega32 using sim900D

[ahmed qureshi]

Please help me in sending txt via gsm sim900D using AVR.

I am using following code.

#define F_CPU 11059200UL

#include <avr/io.h>
#include <avr/interrupt.h>
#include <stdio.h>
#include <stdlib.h>
#include “lcd.h”

#include <util/delay.h>
#include <inttypes.h>
#include <string.h>

void send_msg();
void init_USART();
void usart_send_string(char *str );
void usart_send(char data);
void gsm_cmd(char *cmd);

void init_USART()
{

unsigned int baud=71; //(UBRR= (Fos/ (16*baudrate) )-1 )
UBRRH =(unsigned char)(baud>>;
UBRRL=(unsigned char)baud;
UCSRC|=(1<<URSEL)|(3<<UCSZ0);
//Enable The receiver and transmitter
UCSRB |= (1<<RXCIE) | (1 << RXEN) | (1 << TXEN); // Turn on the transmission reception .

sei();
}
ISR (USART_RXC_vect)
{

unsigned char value;
value = UDR; // Fetch the received byte value into the variable “value”
len_recieved++;
recieved_msg[len_recieved]=value;
if(data_flag==-1)
data_flag=0;
}

}
void usart_send_string(char *str )
{
while((*str)!=’’)
{
if(*str==0x5C)
str++;
usart_send(*str);
str++;
}
}

void usart_send(char data)
{
while(!(UCSRA & (1<<UDRE)));
UDR=data;
}

void gsm_cmd(char *cmd)
{
usart_send_string(cmd);
usart_send(0x0D);
_delay_ms(500);
}

void send_msg()
{

char cmd1[]=”AT+CMGF=1″;
char cmd2[]=”AT+CMGS “+923017698646″”;
char msg[]=”msg sent from gsm”;

gsm_cmd(cmd1);
_delay_ms(3000);

gsm_cmd(cmd2);
_delay_ms(1000);

gsm_cmd(msg);
_delay_ms(100);
usart_send(0x1A);

LCD_write(‘S’);
LCD_write(‘E’);
LCD_write(‘N’);
LCD_write(‘T’);

}
int main(void)
{
DDRA=0xff; // making LCD_DATA port as output port
DDRB=0x07; // making signal as out pute

init_LCD(); // initialization of LCD
_delay_ms(50); // delay of 50 milli seconds

init_USART();

send_msg();

while(1); 
}

[AJISH ALFRED]

Hi Ahmed,

You haven’t mentioned the issue you are facing with the project. I guess your code is not working

Before testing the code make sure that your GSM module is working, connect it to the serial port of PC and try the AT commands for SMS manually using hyperterminal.

[Hemraj]

If your code is not working then you can do one modification in function:

 

void gsm_cmd(char *cmd)
{
usart_send_string(cmd);

usart_send(0x0A);
usart_send(0x0D);
_delay_ms(500);
}

[Author]

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