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gsm coding

 
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shuhaida9337



Joined: 23 May 2016
Posts: 1

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gsm coding
PostPosted: Mon May 23, 2016 9:06 am     Reply with quote
hi i wanna ask
why my coding got error
the error is undefined identifier AT
AT is AT command that i used for sending msg to gsm.
Anyone please help me on this.
Code:

#include <18f4550.h>
#device adc=10
#use delay (clock=4000000)
#fuses hs,nowdt,nolvp,nobrownout,noprotect
#byte porta=0xf80
#byte portc=0xF82
#byte portd=0xf83
#use rs232(baud=9600, xmit=PIN_c6, rcv=PIN_c7,parity=N,stream=gsm)

unsigned int temp,sensor1,sensor2,vout1,vout2;
long count;
long tick=3000;

void send_sms()
    {
            putc("at+cmgs= \"+60134207507"");
            putc(0x0d);
            putc(0x0a);
            delay_ms(1000);
    }
   
       void GSM_initialise()
     {
           putc("AT+CMGF=1\r");
           putc(0x0d);
           putc(0x0a);
           delay_ms(1000);
      }
     
     void main_gsm()
{
   GSM_initialise();
      while(1)
            send_sms();
            printf("****Test****");
            delay_ms(10);
            printf("ALERT!!! Heatstroke risk is high!!!!");
            delay_ms(10);
            printf("*******");
            putc(26);
            delay_ms(1000);
     
}

void main()
{
   count=tick;
   set_TIMER2(0);
   setup_TIMER_2(T2_DIV_BY_4,250,1);
   setup_ccp1 (ccp_pwm);
   set_pwm1_duty(921);
   enable_interrupts(INT_TIMER2);
   enable_interrupts (GLOBAL);
   set_tris_a(1); // porta as input
   set_tris_d(0); // portd as output (buzzer)
   set_tris_c(0); // portc as ouput  (GSM)

setup_adc_ports(all_analog);
setup_adc(adc_clock_internal);
while (1)
{
   set_adc_channel(0); //select input from channel ANO
   delay_ms(10);
   sensor1= read_adc();
   temp= (0.00488*sensor1)*1000;
   vout1=(temp/10);
   set_adc_channel(1);
   delay_ms(10);
   sensor2= read_adc();
   vout2=(sensor2*0.00488)*1000;
   
   
  if (vout1>=14 && vout2>=250)
   {
   output_high(pin_d0);
   delay_ms(100);
   }
   else if (vout1>=14 && vout2<250)
   {
   output_low(pin_d0);
   delay_ms(100);
   }
   else if (vout1<14 && vout2>=250)
   {
   output_high(pin_d0);
   delay_ms(100);
   }
   else if (vout1<14 && vout2<250)
   {
   output_low(pin_d0);
   delay_ms(100);
   }

}
}
Gabriel



Joined: 03 Aug 2009
Posts: 1067
Location: Panama

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PostPosted: Mon May 23, 2016 9:21 am     Reply with quote
Hi,
Look for my post on GSM on the library.

Code:
putc("at+cmgs= \"+60134207507"");


"Putc()" is for single characters, use "Printf()" instead.

g.
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CCS PCM 5.078 & CCS PCH 5.093
PCM programmer



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PostPosted: Mon May 23, 2016 9:25 am     Reply with quote
Quote:
void send_sms()
{
putc("at+cmgs= \"+60134207507"");
putc(0x0d);
putc(0x0a);
delay_ms(1000);
}

void GSM_initialise()
{
putc("AT+CMGF=1\r");
putc(0x0d);
putc(0x0a);
delay_ms(1000);
}


On the first line, you are missing the 2nd escape sequence on the double-
quotes. Also, you should use printf() for these sequences. Do it like this
and it will compile without errors:
Code:
printf("at+cmgs= \"+60134207507\"");

printf("AT+CMGF=1\r");




Quote:
enable_interrupts(INT_TIMER2);
enable_interrupts (GLOBAL);

You have no #int_timer2 interrupt function. If you enable interrupts
without a function and if you get an interrupt, your program will crash.
I think you mis-understand. Just because you enable Timer2 does not
mean you need to enable interrupts for it. Delete the two lines shown above.
ezflyr



Joined: 25 Oct 2010
Posts: 1019
Location: Tewksbury, MA

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PostPosted: Mon May 23, 2016 9:26 am     Reply with quote
Hi,

This line is wrong:

Code:

putc("at+cmgs= \"+60134207507"");


Here is what the manual says about 'putc': putc (cdata) - cdata is a 8 bit character.

You need to be using 'puts', or better yet, 'printf' to be sending data to the GSM modem. Of course, you will actually want to use 'fprintf' with your stream identifier!
_________________
John

If it's worth doing, it's worth doing in real hardware!
Ttelmah



Joined: 11 Mar 2010
Posts: 19506

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PostPosted: Mon May 23, 2016 10:16 am     Reply with quote
Lets just clarify here (or make it more confusing).

Putc, as standard accepts a single character.

CCS has an extension in that any function that accepts a single char, can be called with a constant 'string', and the function will be repeatedly called, once for each character in the string. This was an old extension to help people to be able to handle the limitations on the PIC architecture.
This extension has been retained in later versions of CCS.

So in fact putc will work with a constant string, but the escapes have to be right!. However it is not now the suggested way to work, and is a limited 'non standard on any other compiler' extension.
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