using AT commands

[prajeesh]

Hi all,

am working with PIC16f877 and ccs pcw 3.094

am trying to read sms using command AT+CMGR=1 from a wavecom GSM modem. The message stored in the index 1 is "Hi". so what am trying to do is to read the sms using the AT command and read the response from the modem. the response will have the message along with additional info. so i will be checking for "Hi" and if the read is seccessful, an LED glows (connected to portd.2)

for reading the serial port i used #INT_RDA interrupt. a count is declared to get the total number of interrupts occured..

am facing some issues....please help me in resolving it.

the code written by me is given below

#include "G:\Work\pic\work_outs\serial\serial_send.h"
#include <string.h>

#byte trisc = 0x87
#byte portc = 0x07 // defining port address
#byte trisd = 0x88
#byte portd = 0x08

#define BUFFER_SIZE 90
byte buffer[BUFFER_SIZE];
byte next_in = 0;
byte next_out = 0;
byte count = 0;

void init()
{
setup_adc_ports(NO_ANALOGS);
setup_adc(ADC_CLOCK_DIV_2);
setup_spi(FALSE);
setup_psp(PSP_DISABLED);
setup_counters(RTCC_INTERNAL,RTCC_DIV_2);
setup_timer_1(T1_DISABLED);
setup_timer_2(T2_DISABLED,0,1);
setup_ccp1(CCP_OFF);
setup_ccp2(CCP_OFF);
}

void tx_ate0()
{
putc('A');
putc('T');
putc('E');
putc(0x30);
putc('\r');
}

void tx_data()
{
tx_ate0();

putc('A'); // Transmit "AT" through serial port
putc('T');
putc('+');
putc('C');
putc('M');
putc('G');
putc('R');
putc('=');
putc(0x31);
putc('\r');

}

#int_rda
void rx_serial_data()
{
byte t;
count += 1; // counting total number of interrupts occured
#asm
BSF 0x08, 0
#endasm

buffer[next_in] = getc(); // get the data(single character) from serial port
t=next_in;
next_in=(next_in+1) % BUFFER_SIZE;
if(next_in==next_out)
next_in=t; // Buffer full !!
}

void check_serial_data()
{
char resp_data[] = "\r\n\r\nOK\r\n";

if(strstr(buffer, resp_data)){
#asm
BSF 0x08, 2
#endasm
}
}

void main()
{
byte i;
trisc = 0x80; // RC7 as i/p & RC6 as o/p. RC6 - Tx pin & RC7 - Rx pin
trisd = 0x00; // portd as o/p
portd = 0x00;

memset(buffer, 0, BUFFER_SIZE);
enable_interrupts(global);
enable_interrupts(int_rda); // Enable 'receive data available' interrupt

init(); // initialize peripherals

tx_data();

delay_ms(60000);
for(i = 0; i < count; i ++){
#asm
BSF 0x08, 1
#endasm
delay_ms(500);
#asm
BCF 0x08, 1
#endasm
delay_ms(500);
}
count = 0;
check_serial_data();
}

i was able to send an sms using AT commands and got the correct response back...(read through serail port)

thanks,prajeesh
_________________
Prajeesh
c/o Mobax Networks
Coimbatore
India

[ckielstra]

Some remarks:

1) When posting code use the 'code' button, this helps to preserve the format of your source code and makes it much easier for us to read your program.

2) Instead of many separate putc commands your code will be much easier to read when you combine them into a single printf command.
Instead of

[lover_w40]

i m doing the same think can you explain me code
if you got teh solution, plz give us the source
thanks

[Foppie]