GSM Communication using 8051

[malik]

Hi All,

 

I am a newbie to GSM SIM900 and in learning stage, I am doing a project to transmit and recieve data/instructions to 8051 through GSM. Initially I have written a code that will send a text string to a certain mobile number if 8051 detects 1 on its Port 0. Below is the code which to some extant I have written and copied. Please guide me whether this code is good or not? Based on this code I have further action which I need to perform and will mention here later. Please I need kind check on this code, Thanks!

 

—-CODE—-

 

 

#include<reg51.h>

unsigned char str;

 

void init_serial()  // Initialize serial port

{

TMOD=0x20;        // Mode=2

TH1=0xfd;  // 9600 baud

SCON=0x50;        // Serial mode=1 ,8-Bit data,1 Stop bit ,1 Start bit  , Receiving on

TR1=1;          // Start timer

}

 

void transmit_data(unsigned char str) // Function to transmit data through serial port

{

SBUF=str;                // Store data in sbuf

while(TI==0);                        // Wait till data transmit

TI=0;

}

 

void receive_data()  interrupt 4 // Function to recieve data serialy from RS232 into microcontroller

 {

str=SBUF;                       // Read sbuf

RI=0;

transmit_data(str);             // Transmit to HyperTerminal

 }

 

void main()

{

init_serial(); // Initialize serial port

IE=0x90; 

 

int N1;

P0=0xFF;

delay(50);

N1=P0;

 

if (N1==1)

{

str=(“AT+CMGF=1r”); //Text Mode

transmit_data();

delay(20);

str=(“AT+CMGS=”9600292363″%c”,13);  //Type your desired number to with the text is to send

transmit_data();

delay(20);

str=(“Hi GSM Modem Test”);    //sending message

transmit_data();

delay(20);

}

[RUBEN KURIAKOSE]

Did you check it any compiler.(Kiel u-vision).

[Author]

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