I want to interface GSM module with Tiva C Series Launch Pad

Hai

This is surendra.Currently i am doing project on Tiva C Series Launchpad(TM4C123GH6PM Micro controller).Here I want to interface my GSM module with TIVA C SERIES LAUNCH PAD.Please help me how can i interface my controller with launch pad.Please post me the code if any have done?thank u................

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mudz over 11 years ago

Hello Surendra,
First of all, Please mention what GSM module you are using?
Second thing is(bitter truth) no one is going to post full code for your project here or in almost all forums(unless you have a very good relations with the person who can do the job or Hire a freelancer for the job).
Now about your project, Generally best way to interface a GSM module is using UART(mostly all GSM modules supports this interface).
Interfacing is pretty simple.
Consider this block diagram:

Also you need to look at the GSM module datasheet whether you need to interface it via MAX232 or it already has TTL logic Rx,Tx pins then consider connecting it directly to you launchpad.

Basic Circuit(with 8051):

This is the Circuit with AT89c51 Microcontroller, in your case just connect it with launchpad UART pins(ignore lcd connections).
Communication: To Communicate with GSM modem, AT commands are required. Microcontroller sends these commands to the GSM modem, which is then activated to perform the required operation. The following AT commands are used frequently to control the operations of GSM modem:

Command - Operation

AT+CSMS - Select message service

AT+CMGF - Message Format

AT+CMGL - List messages

AT+CMGR - Read mesaage

AT+CMGS - Send message

and so on.........

You can find all AT commands, just google them.

Simple c code for at89c51(I am posting it just to let you know how these commands works. you can easily convert these code to work with tiva launchpad. In fact there are example UART programs for Tiva microcontrollers just take a look at them)

Code(8051):

#include<reg51.h>             
#include <stdio.h>              /* prototype declarations for I/O functions */
#define LED P0                              //define prot P0 for LED

void serial_init(void);

unsigned int j;
//Setup the serial port for 9600 baud at 11.0592MHz.
//-------------------------------------------------
void serial_init(void)
{
  SCON = 0x50;                        /* SCON: mode 1, 8-bit UART, enable rcvr        */
  TMOD |= 0x20;              /* TMOD: timer 1, mode 2, 8-bit reload                  */
  TH1  = 0xFD;              /* TH1: reload value for 9600 baud @ 11.0592MHz*/
  TR1  = 1;                /* TR1: timer 1 run                            */
  TI  = 1;                /* TI:  set TI to send first char of UART          */
}


//Delay Routine start here
void delay1(int n)
{
  int i;
            for(i=0;i<n;i++);
}

void delay2(int n)
{
  int i;
            for(i=0;i<n;i++)
                        delay1(1000);
}
void led_left()
{
for (j=0x01; j<=0x80; j<<=1)
            {
  LED = j;
  delay1(1000);               
  }
}

//-------------------------------------
//                    Main program starts here
//-------------------------------------
void main(void)
{
            serial_init();                                                                                                //serial initialization
            LED = 0x00;
            printf("AT+CMGF=1%c",13);                                                                      //Text Mode            | hex value of 13 is 0x0D (CR )     
            delay2(20);                                                   
            printf("AT+CMGS=\"9xxxxxxxxx\"%c",13);                                              //Type your mobile number Eg : "9xxxxxxxxx"
            delay2(20);                         
            led_left();                                                                                                  //scroll left
            delay1(20);
            printf("Hi :-) GSM Modem Test");                                                            //Type text as u want
            delay2(20);                                                                                           
            printf("%c",0x1A);                                                                                    //line feed command                                                       
            delay2(20);
                             
            while(1);
}

All above information is just an example on How a GSM module is interfaced, In this case I have used 89c51 Microcontroller but it can easily be interfaced with tiva(and I just showed you how). I hope this little information about GSM module interfacing may help you.

Good Luck

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