Reading msg string from sim900 into PIC

[Kishor_B]

hello guys, I am trying to read msg from sim900 into PIC. i have tried all other features like calling, sending msg..by using PIC.. everything worked perfectly.. but when i tried to read msg using AT+CMGF=1 command.. i could not received msg string.. any suggestions ?

 

[salmanliaquat]

AT+CMGF command only sets the message format (text or PDU). You need to issue AT+CMGR = 1 command in order to read message string.

 

[Kishor_B]

Ooops.. I post AT+CMGF by mistake.. I used AT+CMGR.. bt no string is received. i have used interrupt to receive the string..

 

[alokdaga]

post the code...

 

[Kishor_B]

code:





/* Main.c file generated by New Project wizard
*
* Created: Tue Jan 14 2014
* Processor: PIC16F877A
* Compiler: HI-TECH C for PIC10/12/16
*/

#include <pic.h>
#include <htc.h>
#include <string.h>
#include <stdio.h>
#include <conio.h>


#define data PORTD
#define rs RB5
#define en RB6


//LCD functions----------------------------------------------
//void delay(int n);

void lcdcmd( char value);
void lcddata( char value);
void lcdinit(void);
void lcd_display(int m);
void lcd_disp_cmd(unsigned char value);
void lcd_disp_data(unsigned char value);


void tx(unsigned char str)
{
while(!TXIF);
TXREG=str;
}

void send(char *str)
{
int j;

j=0;
while(str[j]!='\0')
{
tx(str[j]);
j++;
}
}

char read()
{
char a;

while(RCIF==0);
a=RCREG;
return a;

}
void main(void)
{

// Write your code here

TRISB=0x00;
TRISD=0x00;
TRISC=0x81; // RC7,RC6 set to usart mode(INPUT)
TXSTA=0x20;
SPBRG=0x20;
TXSTAbits.TXEN=1;
RCSTA=0x90; // Enable Serial Port & Continuous Receive
INTCONbits.GIE=1;
INTCONbits.PEIE=1;
lcdinit();
char ch1[5],ch[]="AT\r";
int i;

send(ch);

for(i=0;i<4;i++)
{
ch1=read;
if(ch1=='K')
break;
}


i=0;
while(i<4)
{
lcd_disp_data(ch1);
i++;
}

while(1);


}
void lcdinit(void)
{
en=0;

__delay_ms(450);
lcd_disp_cmd(0x02);
__delay_ms(450);
lcd_disp_cmd(0x28); // 4-bt mode
__delay_ms(450);
lcd_disp_cmd(0x0C);// Display on, cursor on
__delay_ms(150);
// lcdcmd(0x0F);
//delay(15);
//lcd_disp_cmd(0x01);// clear lcd
__delay_ms(150);
lcd_disp_cmd(0x06);
__delay_ms(150);
lcd_disp_cmd(0x80);
__delay_ms(150);
}
void lcdcmd(unsigned char value)
{
data= value;
rs= 0;
// rw= 0;
en= 1;

__delay_ms(15);
en= 0;


}
void lcddata(unsigned char value)
{
data= value;
rs= 1;
// rw=0;
en= 1;

__delay_ms(15);
en= 0;

}
void lcd_disp_data(unsigned char value)
{
char data_value1;
data_value1=value&0xF0;
lcddata(data_value1);
data_value1=((value<<4)&0xF0);
lcddata(data_value1);

}
void lcd_disp_cmd(unsigned char value)
{
char cmd_value1;
cmd_value1 = value & 0xF0;

lcdcmd(cmd_value1);
cmd_value1 = ((value<<4) & 0xF0);

lcdcmd(cmd_value1);

}


i am trying to get a response from sim900 and store it in a string and display it on lcd..
there is no any problem with lcd code..
reception from sim900 is not doing well..its a garbage value.. I am attaching an image of result..plz go through it also.. thank u