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lan ahmad
Joined: 23 Jul 2012
Posts: 13
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| Get GSM response using interrupts |
 Posted: Fri Aug 31, 2012 9:26 am |
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Hello guys, I want to ask something. I hope you all can help. I want to display "OK" from gsm modem to lcd. This is my coding. Can someone help me ? I can't get the response.
GSM modem: SIMCOM
| Code: |
#include <16f876a.h>
#device adc=8
#use delay (clock=20000000)
#fuses hs,nolvp,nowdt,noprotect,nobrownout
#use rs232(baud=9600, bits=8, xmit=pin_C6, rcv=pin_C7, parity=n, stream=GSM)
#byte porta=5
#byte portb=6
#byte portc=7
#include "flex_lcd.c"
#include <string.h>
int GET_OK(Stop_Search);
int TEST_AT();
volatile int counter_search=0; //counter to traverse the array
volatile int counter_read=0; //counter to fill the array
volatile Char Recieve_String[70]; //buffer for incoming data
#INT_RDA
void SerialInt()
{
Recieve_String[counter_read]=getchar();
counter_read++;
if(counter_read==69)counter_read=0;
}
void main()
{
SET_TRIS_A( 0x00 );
SET_TRIS_B( 0x00 );
OUTPUT_B(0X00);
SET_TRIS_C( 0x00 );
enable_interrupts(INT_RDA); // enable RDA interrupts
enable_interrupts(GLOBAL); // enable global ints
lcd_init();
lcd_putc("\fget OK");
output_high(PIN_C4); //led on
delay_ms(500);
output_low(PIN_C4); //led off
delay_ms(500);
output_high(PIN_C4);
delay_ms(500);
output_low(PIN_C4);
delay_ms(1000);
while(1)
{
if(TEST_AT())
{
lcd_putc("\fComplete");
}
}
}
int TEST_AT()
{
counter_read=0;
printf("AT\n\r"); //send command
output_high(PIN_C4);
while(counter_read<=8)
{
}
output_low(PIN_C4);
counter_read=0;
delay_ms(500);
if(GET_OK(0X0A))
return(1);
else return(0);
}
int GET_OK(Stop_Search)
{
counter_search=0;
while((Recieve_String[counter_search]!='O')&&(counter_search<Stop_Search)) //check buffer until an 'O' is found or 10 chars have been checked.
{
counter_search++; //obvious
}
if((Recieve_String[counter_search]=='O')&&(Recieve_String[counter_search+1]=='K')) //check for a 'K' after the 'O'
{
counter_search=0;
return(1); //function returns true
}
return(0);
counter_search=0;
} |
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Gabriel
Joined: 03 Aug 2009
Posts: 1067
Location: Panama
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| Posted: Mon Sep 03, 2012 9:08 am |
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Hi,
You need to test your LDC individually to rule out display hardware problems.
Then, you need to test your connections between PIC and CELL.
Remember that in rs232 comm, there is a DTE and DCE.
Both PIC and CELL are DCEs... so you need to swap TX/RX lines.
Remove the TRIS settings... I did that in the past to "save power" ... its not necessary at this moment in your project.
THE MOST IMPORTANT PART HERE IS:
| Code: |
int TEST_AT()
{
counter_read=0;
printf("AT\n\r"); //send command
output_high(PIN_C4);
while(counter_read<=8) //<------------------THIS PART
{
}
output_low(PIN_C4);
counter_read=0;
delay_ms(500);
if(GET_OK(0X0A))
return(1);
else return(0);
}
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If your modem does not respond to the "AT" command with more than 8 chars you will be stuck inside that loop.
Try this better (my code was specific to my modem):
| Code: |
int TEST_AT()
{
counter_read=0;
printf("AT\n\r"); //send command
output_high(PIN_C4);
delay_ms(500); //<------------------CHANGE TO THIS
output_low(PIN_C4);
counter_read=0;
delay_ms(500);
if(GET_OK(0X0A))
return(1);
else return(0);
}
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I hope that helps.
G.
_________________
CCS PCM 5.078 & CCS PCH 5.093 |
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