Re: [avr-chat] gsm modem stk500

[David Breeze]

I have not studied your code but the first obvious thing to stand out is that 
at 115200 Baud you will have an error of over 8% with a 4MHz clock.  The 
maximum allowable for good communications is 2%.

HTH

David

>>> agnostos <address@hidden> 17 May 2008 20:25 >>>

hello i have to make a project until this Monday and i have a big problem
i can send at commands to gsm modem but i can't get the answers and i don't
know why.
the code is
Code:
/*****************************************************
This program was produced by the
CodeWizardAVR V1.25.9 Professional
Automatic Program Generator
© Copyright 1998-2008 Pavel Haiduc, HP InfoTech s.r.l.
http://www.hpinfotech.com 

Project :
Version :
Date    : 16/5/2008
Author  : ditoskas                       
Company : ditoskas                       
Comments:


Chip type           : ATmega8515L
Program type        : Application
Clock frequency     : 4,000000 MHz
Memory model        : Small
External SRAM size  : 0
Data Stack size     : 128
*****************************************************/

#include <mega8515.h>

//TA CR KAI LF XRISIMOPOIOUNTAI GIA TIN APOSTOLI TOY ENTER.
#define CR 0x0D
#define LF 0x0A

//DEKAEKSADIKI TIMI TOY CTRL-Z EINAI I 0x1A.
#define CTRLZ 0x1A
#include <delay.h>
// Standard Input/Output functions
#include <stdio.h>
// Declare your global variables here
//char msg[127];                 
 char myData[127];
 void GetData(void)
 {                                   
        int i;   
        PORTB.1 = 1;
        delay_ms(100);
        PORTB.1 = 0;
        for (i = 0;i<10;i++)   
        {                             
                PORTB.1 = 1;
                myData[i] = getchar();               
              //  delay_ms(100);
                PORTB.1 = 0;
               // if (myData[i]=='\0')
                 //       break;
        }
 }
void SendSms(void)
{                     
        printf("at+cmgs=6938699188"); 
        putchar( CR ); //CR
        putchar( LF ); //LF 
        delay_ms(100);         
        printf("%s","TEST");
        putchar(CTRLZ);   
      //  putchar( LF ); //LF 
};

void main(void)
{
// Declare your local variables here
 
// Input/Output Ports initialization
// Port A initialization
// Func7=In Func6=In Func5=In Func4=In Func3=In Func2=In Func1=In Func0=In
// State7=T State6=T State5=T State4=T State3=T State2=T State1=T State0=T
PORTA=0x00;
DDRA=0x00;

// Port B initialization
// Func7=Out Func6=Out Func5=Out Func4=Out Func3=Out Func2=Out Func1=Out
Func0=Out
// State7=0 State6=0 State5=0 State4=0 State3=0 State2=0 State1=0 State0=0
PORTB=0x00;
DDRB=0xFF;

// Port C initialization
// Func7=In Func6=In Func5=In Func4=In Func3=In Func2=In Func1=Out Func0=In
// State7=T State6=T State5=T State4=T State3=T State2=T State1=1 State0=T
PORTC=0x02;
DDRC=0x02;

// Port D initialization
// Func7=In Func6=In Func5=In Func4=In Func3=In Func2=In Func1=In Func0=In
// State7=T State6=T State5=T State4=T State3=T State2=T State1=T State0=T
PORTD=0x00;
DDRD=0x00;

// Port E initialization
// Func2=In Func1=In Func0=In
// State2=T State1=T State0=T
PORTE=0x00;
DDRE=0x00;

// Timer/Counter 0 initialization
// Clock source: System Clock
// Clock value: Timer 0 Stopped
// Mode: Normal top=FFh
// OC0 output: Disconnected
TCCR0=0x00;
TCNT0=0x00;
OCR0=0x00;

// Timer/Counter 1 initialization
// Clock source: System Clock
// Clock value: Timer 1 Stopped
// Mode: Normal top=FFFFh
// OC1A output: Discon.
// OC1B output: Discon.
// Noise Canceler: Off
// Input Capture on Falling Edge
// Timer 1 Overflow Interrupt: Off
// Input Capture Interrupt: Off
// Compare A Match Interrupt: Off
// Compare B Match Interrupt: Off
TCCR1A=0x00;
TCCR1B=0x00;
TCNT1H=0x00;
TCNT1L=0x00;
ICR1H=0x00;
ICR1L=0x00;
OCR1AH=0x00;
OCR1AL=0x00;
OCR1BH=0x00;
OCR1BL=0x00;

// External Interrupt(s) initialization
// INT0: Off
// INT1: Off
// INT2: Off
MCUCR=0x00;
EMCUCR=0x00;

// Timer(s)/Counter(s) Interrupt(s) initialization
TIMSK=0x00;

// USART initialization
// Communication Parameters: 8 Data, 1 Stop, No Parity
// USART Receiver: On
// USART Transmitter: On
// USART Mode: Asynchronous
// USART Baud Rate: 115200
UCSRA=0x00;
UCSRB=0x18;
UCSRC=0x86;
UBRRH=0x00;
UBRRL=4000000/16/115200-1;

// Analog Comparator initialization
// Analog Comparator: Off
// Analog Comparator Input Capture by Timer/Counter 1: Off
ACSR=0x80;
PORTB.0 = 0;
PORTB.1 = 0;
//printf("ATE0\r\n");
while(1)
{
printf("AT \r\n");

PORTB.0 = 1;
scanf("%s", myData);
//GetData();
printf("at+cmgs=6938699188\r\n");

printf("%s",myData);
putchar(CTRLZ);
delay_ms(1000);
// if (myData[0] == 'O')
PORTB.0 = 0;
break;
}
}


when i use the scanf command i get the same information that i send (the AT
command) if use the GetData() the program crash out. why??? what must i
change to read a message from gsm???
(the connection between gsm and stk is why null modem cable (2 females) and
i connect the 2,3,5 pins from cable to 3,2,5 on avr the same connection is
on modem)

please help me because time pressure me and i don't know what to do...

i hope to your answer...
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