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Vivi
Joined: 05 Feb 2010
Posts: 5
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| sms controller with pic16f873 |
 Posted: Sat Feb 06, 2010 6:00 am |
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| Hi Guys, I have small problem and I will apreciate little help. I just started developing sms controller, based on pic16f873 using CCS. Initially I was thinking that I will find some examples on the net to use as starting point, but after 10-15 days of browing I am berried in archived projects, but not relly what I can use. I need to control relays and send GPS data. I am using AT commands (this is what SIM508 modile operates with). This module has GPS receiver, so I just need to get the data and transmit with the relay status let say every 2 hours. I manage to configure the module to GSM and GPS part to work with 9600 boud speed, so I will use UART of the PIC. Can some one help ? |
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asmboy
Joined: 20 Nov 2007
Posts: 2128
Location: albany ny
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| Posted: Sat Feb 06, 2010 8:32 am |
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Post the code you need help with.
That is how you attract attention that will help you.
The first step is YOU making a start with your code on display.
I don't come here looking to do your work for you - only to see what parts you don't get. & help with THAT.
If you don't even know how to start -
then you are in the wrong line of work.
and looking in the wrong place too. |
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Vivi
Joined: 05 Feb 2010
Posts: 5
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| connection problem |
| Posted: Sat Feb 06, 2010 3:41 pm |
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Hi Asmboy,
the first problem I have is the connection between the max232 and the SIM module. When I post AT commands from my PC using hyperterminal and the gsm module sends SMS. I have transferred these same commands into the PIC ( I am using UART & max232). When I test this by connecting the PIC's port to the SIM module and run the SW- nothing appears. No SMS is sent (at least I didn't receive it).
I believe my connection is not correct. I am using only 2, 3 and 5 pin of the 9 pin connector. I have seen people shorting 4 and 7pin or 1,6 and4 + 7 and 8. This is the 9 pin conector from the SIM module side. What is the correct connection?
The second problem is what if I just ignore the incoming reply from the GSM modem. I can just wait 1 second (until the modem replies OK for example) and post the next command. Is this OK or I must handle the reply?
Last edited by Vivi on Sat Feb 06, 2010 4:44 pm; edited 1 time in total |
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Vivi
Joined: 05 Feb 2010
Posts: 5
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| Posted: Sat Feb 06, 2010 3:52 pm |
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The code I am using for testing is below.
| Code: | // test SMS v6
#include "C:\Program files\PICC\Devices\16f873.h"
#fuses HS,NOWDT,NOPROTECT,NOLVP,NOBROWNOUT,PUT
#use delay(clock=20000000)
//#include <lcd.h>
#Byte PortA=0x05
#Byte PortB=0x06
#use fast_io(A)
#use fast_io(B)
#Define Nop #Asm Nop #EndAsm
send_SMS();
void send_SMS(void)
{
#use rs232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7)
printf("AT\r\n");
delay_ms(5000);
printf("at+cmgf=1\r\n");
delay_ms(5000);
printf("at+cmgs=\"+4478XXXXXXXX\"\r\n");
delay_ms(5000);
printf("This is the message.");
putc(0x1A);
delay_ms(5000);
}
void main()
{
SET_TRIS_A( 0b10000110 );
SET_TRIS_B( 0b00000101 ); delay_ms(1);
send_SMS();
while(1)
{
// Toggle led
PORTA ^= 1;
// Simple delay
delay_ms(500);
}
}
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Guest
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| Posted: Sat Feb 06, 2010 7:58 pm |
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| OK. I have this running. I had to connect pin 7+8 and 1 +4 on the connector going to the SIM module. I am not sure I need both connections but I will check tomorrow and I will post my findings. |
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Vivi
Joined: 05 Feb 2010
Posts: 5
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| Posted: Thu Feb 11, 2010 5:41 am |
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I have also the function send_SMS running. However, I have some problem receiving SMS.
Last edited by Vivi on Sun Feb 21, 2010 4:14 pm; edited 2 times in total |
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Vivi
Joined: 05 Feb 2010
Posts: 5
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| problem receiving SMS |
| Posted: Sun Feb 21, 2010 6:10 am |
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Hi Guys, I have problem receiving SMS. I have tested the code only with single character and it is working perfect. However, when I want to parse a text it fails. Can someone help?
The code which is working is:
| Code: |
#include "C:\Program files\PICC\Devices\16f873.h"
#fuses HS,NOWDT,NOPROTECT,NOLVP
#use delay(clock=20000000)
#Byte PortA=0x05
#use rs232(baud=9600,parity=N,bits=8,xmit=PIN_C6,rcv=PIN_C7,stream=GSM,errors)
// **************** Function definitions ******************
read_SMS();
char b; char x;
// ************* interupts ************************
#int_rda
void serial_isr()
{
char c;
c=getc();
if('*'==c)b=1;
}
void read_SMS()
{
b=0;
fprintf(GSM,"AT\r\n");
delay_ms(2000);
fprintf(GSM,"at+cmgf=1\r\n");
delay_ms(2000);
fprintf(GSM,"AT+CMGL=\"ALL\"\r\n");
delay_ms(2000); // start saving message at the begining of the array
}
void main()
{
SET_TRIS_A( 0b10000110 );
enable_interrupts(int_rda);
enable_interrupts(global);
output_high(PIN_A0);
read_SMS();
while(1)
{
while(b)
{
// Toggle led
PORTA ^= 1;
// Simple delay
delay_ms(500);
}
}
}
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The code which is NOT working
| Code: |
#include "C:\Program files\PICC\Devices\16f873.h"
#fuses HS,NOWDT,NOPROTECT,NOLVP
#use delay(clock=20000000)
#Byte PortA=0x05
#Define CR 0x0D // Carriage return
#use rs232(baud=9600,parity=N,bits=8,xmit=PIN_C6,rcv=PIN_C7,stream=GSM,errors)
int RX_Command_ready;
int RX_Command_beginning;
#define RX_SIZE 80 //RS232 buffer for serial reception
char RxBuffer[RX_SIZE];
int Serial_Index;
read_SMS();
char b; char x;
// ************* interupts ************************
#int_rda
void serial_isr()
{
if(RX_Command_Ready==0)
{
RxBuffer[Serial_Index]=fgetc(GSM); //getRx data
switch(RxBuffer[Serial_Index])
{
case 'A':
if((RX_Command_Beginning==0) && (Serial_Index>0) &&(RxBuffer[Serial_Index-1]=='*'))
{
RxBuffer[1]=RxBuffer[Serial_Index];
Serial_Index =2;
RX_Command_Beginning=1;
}
else
{
if(RX_Command_Beginning==0) Serial_Index=1;
else Serial_Index=(Serial_Index+1) % RX_SIZE;
}
return;
// CR the command is completed
case CR:
if(RX_Command_Beginning==1)
RX_Command_Ready=1;
else
Serial_Index=1;
return;
default: // update the buffer pointer
if(RX_Command_Beginning==1)
Serial_Index=(Serial_Index+1) % RX_SIZE;
else
{ RxBuffer[0]=RxBuffer[Serial_Index];
Serial_Index=1;
}
}//switch
}
}
void read_SMS()// thank you gabriel-> http://www.ccsinfo.com/forum/viewtopic.php?t=39913&highlight=sms
{ b=0;
fprintf(GSM,"AT\r\n");
delay_ms(2000);
fprintf(GSM,"at+cmgf=1\r\n");
delay_ms(2000);
fprintf(GSM,"AT+CMGL=\"ALL\"\r\n"); //putchar(0x0D);
delay_ms(5000); // start saving message at the begining of the array
}
void main()
{ SET_TRIS_A( 0b10000110 );
setup_adc_ports(NO_ANALOGS);
ext_int_edge(h_to_l);
enable_interrupts(int_rda);
enable_interrupts(global);
output_high(PIN_A0);
read_SMS();
disable_interrupts(int_rda);
disable_interrupts(global);
if(RX_Command_ready>0)
b=1;
while(1)
{
while(b)
{
// Toggle led
PORTA ^= 1;
// Simple delay
delay_ms(500);
}
}
}
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 may be I need some optimization of my int_rda. I can see the SMS clearly on Hyperterminal when I test separately. The message is "*A123". |
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yousafzai82
Joined: 04 Mar 2010
Posts: 13
Location: Pakistna
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| Posted: Fri Mar 05, 2010 12:35 am |
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HI vivi
I have studied your project and it was helpful for me. I am doing the same kind of project. I have to take 2 adc results plus one status (high or low) and then send the data through sms. Also if possible I can receive sms on microcontroller side and trip some relays. Help from your side will be a great favour...
Please check the following link to see my coding....
http://www.ccsinfo.com/forum/viewtopic.php?t=41926&highlight=pic16f877+programming+++bit+adc
_________________
zaky |
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Wayne_
Joined: 10 Oct 2007
Posts: 681
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| Posted: Fri Mar 05, 2010 3:05 am |
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I have looked at your code and think it needs serious attention:-
| Code: |
case 'A':
if((RX_Command_Beginning==0) && (Serial_Index>0) &&(RxBuffer[Serial_Index-1]=='*'))
{
RxBuffer[1]=RxBuffer[Serial_Index];
Serial_Index =2;
RX_Command_Beginning=1;
}
else
{
if(RX_Command_Beginning==0) Serial_Index=1;
else Serial_Index=(Serial_Index+1) % RX_SIZE;
}
return;
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Firstly, you should be using a break instruction to break out of case statements, I am sure return works fine but looks messy, in your code you can just replace the returns with break.
more importantly I don't think it will ever work. Your problem is this:-
&&(RxBuffer[Serial_Index-1]=='*')
I ran through the code in my head and from what I can see serial_index -1 will allways be 0 which will allways contain the char 'A' as you never overwrite this index!
based on the response :-
| Code: |
AT+CMGR=2\0D
\0D
\0A
+CMGR: "REC UNREAD","01150971734","Dn55 Movil","09/08/14,19:51:49-12"\0D
\0A
*LED1 1*\0D
\0A
\0D
\0A
OK\0D
\0A
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First char is 'A' this gets stored at index 0.
Serial_Index is then set to 1.
RX_Command_Beginning remains at 0
Actually, looking at it again you never see another 'A' so it will never enter the case 'A' block again. Unless your message contains an 'A' ?
But even if it did the problem I stated before remains, Serial_Index - 1 will never = '*' as far as I can see. I could be wrong  |
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