Discussion in "Embedded GSM Development" started by    Alvanbert    Feb 10, 2012.
Thu Mar 01 2012, 06:28 PM
#31
yeah it receives them and can display them if i widen the loop to display ten messages.
Fri Mar 02 2012, 04:13 AM
#32
Ok then its fine..
U can divide the msg in next line.Use 20X4 LCD so that entire msg will be displayed in one shot.
Fri Mar 02 2012, 12:23 PM
#33
Hi kiran. I have tried using the 20x4 lcd display but the problem with it is it skips the second and fourth line hence it still leaves out some text


[ Edited Fri Mar 02 2012, 12:54 PM ]
Fri Mar 02 2012, 12:26 PM
#34
if msg has >40 characters. As with the 40x2, it displays only on the first line and leaves out some text as well


[ Edited Fri Mar 02 2012, 12:55 PM ]
Fri Mar 02 2012, 12:30 PM
#35
I want the 20x4 or 40x2 display to display on all line the same message(at once) from top to bottom without leaving out some text. Thanx


[ Edited Fri Mar 02 2012, 12:56 PM ]
Fri Mar 02 2012, 12:33 PM
#36
And I had forgotten to ask, Is it possible to add a scrolling format to the message display where by ot scrolls from the last line upwards as other messages follow from below.


[ Edited Fri Mar 02 2012, 12:59 PM ]
Fri Mar 02 2012, 02:02 PM
#37
Yes u can scroll the msgs.
Can u show us the code how u are breaking the entire array and sending to LCD.
Fri Mar 02 2012, 04:07 PM
#38
attached below is my entire code.

		 #include <REGX52.H>


#define LCD P1
#define LCD_EN		0x80
#define LCD_RS		0x20
                     
//LCD Commands        

#define LCD_SETMODE		   0x04
#define LCD_SETVISIBLE	   0x08
#define LCD_SETFUNCTION	   0x28
#define LCD_SETDDADDR	   0x80

void delayms(unsigned char);
void delayus(unsigned char);
void lcd_init();
void lcd_reset();
void lcd_cmd (char);
void lcd_data(unsigned char);
void lcd_str (unsigned char *);
void clear(void);
void tx0(unsigned char);
void delay_sms (unsigned int);
void SMSString(char*text) ;
void init();
void read_text(unsigned char *);
unsigned int var,i,n;
unsigned char j,abc;
unsigned char idata msg1[150];
unsigned char rec_no[20];
unsigned char time_date[20];
void gsm_loop(unsigned int);

void serial () interrupt 4
{
msg1[abc]=SBUF;
abc++;
RI=0;
}

void main (void)
{

n=0x35;

gsm_loop(n);
delay_sms(2000);
}

void gsm_loop(unsigned int n)
{
  for(i=0x31;i<=n;i++)
  {
  clear();
  init();
  lcd_init();
  var=i;
  SMSString("AT\r"); // AT commands to initialize gsm modem
  delay_sms(1000);

  SMSString( "ATe0\r"); // turn off echo
  delay_sms(1000);

  SMSString( "AT&W\r"); // save settings
  delay_sms(1000);

  SMSString( "AT+CMGF=1\r"); // select text mode for sms
  delay_sms(1000);

  SMSString( "AT+CNMI=2,1,0,0,0\r"); // notification of new sms
  delay_sms(1000);

  SMSString( "AT+CMGR=");   // AT command to read sms
  tx0(var);
  SMSString("\r");

  IE=0X90;   // Enable serial interrupt
  delay_sms(2000);

  read_text(msg1);		// read sms and store in buffer msg1

  delay_sms(2000);			  
  IE=0X00;       // Disable all interrupt
            
  }
}


void init(void)
{
j=0;
abc=0;
TL1=0XFD; //9600 @ 11.0592
TH1=0xFD;
TMOD=0x20;
SCON=0x50;
TR1=1;
}

void SMSString(unsigned char* text) //function to send SMS using GSM modem
{
while (*text)
{
tx0(*text++);
}
}


void tx0(unsigned char x) //send data to serial port 0
{
EA=0;
SBUF=x;
while(TI==0);
TI=0;
EA=1;
}


void delay_sms (unsigned int count)
{
unsigned int i;                         // Keil v7.5a 
    while(count) {
        i = 115;
                while(i>
0) i--;
        count--;
}
}

void read_text( unsigned char *msg)
{
unsigned char *temp;
temp=msg;
do
msg++;
while(*msg!='#');
msg++;
do
*temp++=*msg++;
while(*msg!='#');       // reaching at end of message
*temp='\0';


lcd_cmd(0x80);
lcd_str(msg1);



         // array having message

}

void lcd_reset()
{
	LCD = 0xFF;
	delay_sms(40);
	LCD = 0x03+LCD_EN;
	LCD = 0x03;
	delay_sms(40);
	LCD = 0x03+LCD_EN;
	LCD = 0x03;
	delay_sms(5);
	LCD = 0x03+LCD_EN;
	LCD = 0x03;
	delay_sms(5);
	LCD = 0x02+LCD_EN;
	LCD = 0x02;
	delay_sms(5);
}


void lcd_init ()
{
	lcd_reset();
	lcd_cmd(LCD_SETFUNCTION);                    // 4-bit mode - 1 line - 5x7 font. 
	lcd_cmd(LCD_SETVISIBLE+0x04);                // Display no cursor - no blink.
	lcd_cmd(LCD_SETMODE+0x02);                   // Automatic Increment - No Display shift.
	lcd_cmd(LCD_SETDDADDR);                      // Address DDRAM with 0 offset 80h.
 }

 void lcd_cmd (char cmd)
{ 
	LCD = ((cmd >
>
 4) & 0x0F)|LCD_EN;
	LCD = ((cmd >
>
 4) & 0x0F);

	LCD = (cmd & 0x0F)|LCD_EN;
	LCD = (cmd & 0x0F);

    delay_sms(1);
}

void lcd_data (unsigned char dat)
{ 
	LCD = (((dat >
>
 4) & 0x0F)|LCD_EN|LCD_RS);
	LCD = (((dat >
>
 4) & 0x0F)|LCD_RS);
	
	LCD = ((dat & 0x0F)|LCD_EN|LCD_RS);
	LCD = ((dat & 0x0F)|LCD_RS);

    delay_sms(1);
}

void clear(void)
{
unsigned char a;
for(a=0;a<100;a++)
msg1[a]=0x00;
}

void lcd_str (unsigned char *str)
{
	while(*str){
		lcd_data(*str++);
	}
}

Fri Mar 02 2012, 04:09 PM
#39
The above code only displays messages enclosed between #. i wanted to include that option in my code
Fri Mar 09 2012, 04:26 PM
#40
Guys. Pliz really need your help

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