Using AT commands in C

[micro sem]

hi
can someone show me how to write AT commands in C. i m using 8051. does the command have to be in string format. Plz give a couple of examples
also i need help regarding text format of sms. how to interpret it and extract the actual message....plz help

 

[txdx2005]

ComSendStr("AT\r");

 

[cllunlu]

now.if you wanna know At commands.I can help you

 

[BeTZ]

to send an AT command you can use a string variable and use the stdio.h standart function to help.

#include <stdio.h>

unsigned char AT[]="AT";
putchar (AT);
putchar (0x0D);

above is an simple example to send "AT" in MCU, you can try it

 

[micro sem]

thanx BeTZ.....but i m confused.......will the putchar automatically direct the command to serial port of my 8051 or will i have to modify the stdio.h for this direction....plz help........this is urgent

 

[BeTZ]

I'm sorry, I'm wrong..........

but you can use puts ("string") instead of putchar, because puts is a procedure, in stdio.h, which it's used to send a string in serial and putchar is a send character procedure.

#include <AT89x52.h>
#include <stdio.h>

void InitUART(void)
{
TMOD=0x20;//Timer 1,Mode 2
TH1 = -3;// 9600 baud rate at 11.059 MHz
TR1=1; // Start Timer1
SCON=0x52;// 8-bit UART mode 1
}

void main (void)
{
unsigned char AT[] = "AT";
InitUART();
puts(AT);// or //puts("AT");
putchar(0x0D);
}

 

[micro sem]

thanx BeTZ, that was of great help........just clear this plz.....what is AT89x52.h>.....i m using 8051 with keil compiler........do i need to necessarily include it or will including reg52.h do.......

 

[BeTZ]

As far as i know, it has same purpose when you included AT89x52.h or reg52.h files.

You can open and compare it (keil>>C51>>INC>>ATMEL).

Hope it can help you.....

 

[karim_el_joker]

i need header for 89c51

 

[bobcat1]

Hi

See Atmel site they have project for using Cell modem with AT command all code written in C language

All the best

Bobi

 

[akilleuz]

Could you please post a link? i cant find it :-(