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[SOLVED] SMS Reading Error with SIM300 and PIC16F73

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Mithun_K_Das

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I was working reading a SMS from SIM300cz GSM module. MCU: PIC16F73. I did some other projects SMS sending with this setup. They all works so fine. Even this one works fine too in SMS Sending. But I don't know where I made a mistake with code, it can not read anything from UART.

Code C++ - [expand]
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/*******************************************************************************
*                   Program for 'GSM Based Traffic Signal Control System'      *
*                          Compiler: MicroC Pro for PIC v.5.6.1                *
*                         Program Written by Engr. Mithun K. Das               *
*                        e-mail: [email]mithun060@gmail.com[/email]; 01722448270              *
*                          MCU: PIC16F73B; X-Tal:8MHz(internal)                *
*                                     18-Apr-2015                              *
*******************************************************************************/
// LCD module connections
sbit LCD_RS at RB7_bit;
sbit LCD_EN at RB6_bit;
sbit LCD_D4 at RB5_bit;
sbit LCD_D5 at RB4_bit;
sbit LCD_D6 at RB3_bit;
sbit LCD_D7 at RB2_bit;
 
sbit LCD_RS_Direction at TRISB7_bit;
sbit LCD_EN_Direction at TRISB6_bit;
sbit LCD_D4_Direction at TRISB5_bit;
sbit LCD_D5_Direction at TRISB4_bit;
sbit LCD_D6_Direction at TRISB3_bit;
sbit LCD_D7_Direction at TRISB2_bit;
// End LCD module connections
 
 
unsigned char text[64];
int i = 0;
short ready = 0;
char *string;
 
void UART_Write_CText(const char *cptr)
{
    char chr;
    for ( ; chr = *cptr ; ++cptr ) UART1_Write(chr);
}
 
void Lcd_COut(char row, char col, const char *cptr)
{
    char chr = 0;             //first, it is used as empty string
    Lcd_Out(row, col, &chr);  //nothing to write but set position.
    for ( ; chr = *cptr ; ++cptr ) Lcd_Chr_CP(chr); //out in loop
}
 
void Delay2s()
{
   int d;
   for(d=0;d<200;d++)
   {
      Delay_ms(10);
   }
}
 
void Send_SMS_Int(void);
void Read_SMS_Int(void);
 
void interrupt()
{
    if (RCIF_bit)
    {       // If interrupt is generated by RCIF
        text[i] = UART1_Read(); // Read data and store it to txrt string
        i++;             // Increment string index
        if (i >= 60)
        {
            i = 0;        //   set it to zero
            ready = 1;    // Ready for parsing GPS data
        }
        RCIF_bit = 0;    // Set RCIF to 0
    }
}
 
void main()
{
  TRISA = 0x00;
  TRISC = 0x00;
  PORTA = 0x00;
  PORTC = 0x00;
 
  ADCON0 = 0x00;
  ADCON1 = 0x07;//all digital
 
  Lcd_Init();//initialize LCD
  Lcd_Cmd(_LCD_CLEAR);
  Lcd_Cmd(_LCD_CURSOR_OFF);
  
  Lcd_COut(1,1,"SMS BASED TRFc.");
  Lcd_COut(2,2,"SIGNAL CONTROL");
  Delay_ms(2000);
  
  Lcd_Cmd(_LCD_CLEAR);//clear display
  Lcd_COut(1,1,"INITIALIZING...");
  Lcd_COut(2,1,"UART(9600)");
  
  UART1_Init(9600);//initialize UART at br 9600 bps
  Delay_ms(3000);// leave some time for UART
 
  
  Lcd_Cmd(_LCD_CLEAR);//clear display
  Lcd_COut(1,1,"INITIALIZING...");
  Lcd_COut(2,1,"RCIF INTERRUPT");
 
  GIE_bit = 1; // Enable Global interrupt
  PEIE_bit = 1; // Enable Peripheral interrupt
  RCIE_bit = 1; // Enable USART Receiver interrupt
 
  Delay_ms(100);
  Lcd_Cmd(_LCD_CLEAR);//clear display
  
  while(1)
  {
         OERR_bit = 0;// clear Overrun Error bit
         FERR_bit = 0;//clear Farming Error bit
        /*Send_SMS_Int(void);
 
         Lcd_Cmd(_LCD_CLEAR);//clear display
         Lcd_COut(1,1,"Writing data");
         Delay2s();
 
         UART_Write_CText("SMS Sending Test");
         UART1_Write((char)26);
         Delay2s();
         Lcd_Cmd(_LCD_CLEAR);//clear display
         Lcd_COut(1,1,"Data sent");
         Delay2s();*/
         
         Read_SMS_Int(void);
         UART_Write_CText("AT\r\n");
  }//while(1)
}//void main
 
 
void Send_SMS_Int(void)
{
     RCIE_bit = 0;//Disable RCIE
     Lcd_Cmd(_LCD_CLEAR);//clear display
     Lcd_COut(1,1,"SENDING SMS... ");
     Delay2s();
     Lcd_Cmd(_LCD_CLEAR);//clear display
     Lcd_COut(1,1,"SELECT SMS MODE");
     Lcd_COut(2,1,"AT+CMGF=1");
     Delay2s();
     UART_Write_CText("AT+cmgf=1\r\n");
     Delay2s();
     Lcd_Cmd(_LCD_CLEAR);//clear display
     Lcd_COut(1,1,"SET NUMBER");
     Lcd_COut(2,1,"AT+CMGS=`NUMBER`");
     Delay2s();
     UART_Write_CText("AT+cmgs=");
     UART1_Write((char)'"');
     UART_Write_CText("01722448270");
     UART1_Write((char)'"');
     UART1_Write((char)13);
     UART1_Write((char)10);
     Delay2s();
}
 
void Read_SMS_Int(void)
{
    again:
    Lcd_Cmd(_LCD_CLEAR);//clear display
    Lcd_COut(1,1,"READING SMS... ");
    Delay2s();
    Lcd_Cmd(_LCD_CLEAR);//clear display
    Lcd_COut(1,1,"SELECT SMS MODE");
    Lcd_COut(2,1,"AT+CMGF=1");
    Delay2s();
    UART_Write_CText("AT+CMGF=1\r\n"); //select SMS mode
    Delay2s();
    Lcd_Cmd(_LCD_CLEAR);//clear display
    Lcd_COut(1,1,"SET LOCATION 2");
    Lcd_COut(2,1,"AT+CNMI=2,1");
    Delay2s();
    UART_Write_CText("AT+CNMI=2,1\r\n"); //select memory bank 2
    Delay2s();
    Lcd_Cmd(_LCD_CLEAR);//clear display
    Lcd_COut(1,1,"ENGLISH SMS ONLY");
    Lcd_COut(2,1,"AT+CSCS=`GSM`");
    Delay2s();
    UART_Write_CText("AT+CSCS="); //select only English
    UART1_Write((char)'"');
    UART_Write_CText("GSM");
    UART1_Write((char)'"');
    UART1_Write((char)13);//send Enter
    Delay2s();
    
    ready = 0; //clear ready
    Lcd_Cmd(_LCD_CLEAR);//clear display
    Lcd_COut(1,1,"READ LOCATION 2");
    Lcd_COut(2,1,"AT+CMGR=2");
    Delay2s();
    memset(text, '\ ', sizeof(text));//clear text in each table
    i = 0; //   set it to zero
    GIE_bit = 1;
    PEIE_bit = 1;
    RCIE_bit = 1;//Enable RCIE
    RCIF_bit = 0;//clear flag
    UART_Write_CText("AT+CMGR=2\r\n");
    Delay2s();
    Delay2s();
    
    if(ready==1)
    {          // if data is received
 
       ready = 0; //clear ready
       Lcd_Cmd(_LCD_CLEAR);//clear display
       Lcd_COut(1,1,"SMS READING OK");
       Delay2s();
       UART_Write_CText("SMS DATA:\n");
       for(i=0;i<75;i++)
       {
            UART1_Write_Text(text[i]);
            Delay_ms(5);
       }
       UART_Write_CText("END \n");
       UART_Write_CText("AT\r\n");
       Delay2s();
       Delay2s();
       
       //Delay2s();
       //Lcd_Cmd(_LCD_CLEAR);//clear display
       //Lcd_COut(1,1,"DELETE SMS AT 2");
       //Lcd_COut(2,1,"AT+CMGD=2");
       
       //Delay2s();
       //UART_Write_CText("AT+CMGD=2\r\n");
       Delay2s();
    }
    else
    {
       Lcd_Cmd(_LCD_CLEAR);//clear display
       Lcd_COut(1,1,"IF SMS NOT FOUND");
       Lcd_COut(2,1,"READ AGAIN");
       Delay2s();
       goto again;
    }
}
 
 
//end of the program



Can anyone tell me where I did the mistake? I'm simulating the system in real time hardware. Also I simulated it, it can not read any thing in the uart terminal.
Thanks in advance.
 

Mithun_K_Das

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OK, I've solved it. The point was, UART initialization will be in the end of all initialization. And now I can read data from the modem using PIC microcontroller easily.

Thank you all.
 

milan.rajik

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That doesn't cause problem. I have done may GSM SIM900 based projects. Please zip and post your complete mikroC project files. I will check it.
 

Mithun_K_Das

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I've changed many times the code. So That file will not be available now. But if you wish, then you can make a new project using my previous code.
 

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