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Message |
Fabri
Joined: 22 Aug 2005
Posts: 275
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| Send SMS doesn't work |
 Posted: Thu Oct 30, 2014 12:25 am |
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Hi to all,
I have a strange problem I can't understand. I'm working around PIC18 drive a GSM modem with AT command. It's work fine in debug mode with ICD2 and Pickit3 but after program micro it receive SMS but don't send out it.
Routine SEND_SMS() is based on old post but it's quite simple.
This is code of this Routine:
| Code: |
//______________________________________________________________________________
//
// SEND SMS
void SEND_SMS()
{
long i;
if (debug_lcd){
lcd_putc('\f');
printf(lcd_putc,"Send SMS");
lcd_putc('\n');
printf(lcd_putc,"%s",nr_tel_SMS); // In nr_tel_SMS I have Phone numner as string follow "+YYXXXXXXXXXX"
}
delay_ms(1000);
counter_read=0;
printf("AT+CMGS=\"%s\"\r",nr_tel_SMS); // In nr_tel_SMS I have Phone numner as string follow "+39XXXXXXXXXX"
while(Receive_String[0]!='>'){
delay_ms(100);
i++;
if (i>300)
break;
}
counter_read=0;
printf("%s \n\r",testo_SMS);
putchar(0x1A);
DELAY(20);
}
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I print out on LCD some information and seems PIC wait for a very long time ">" character. This not happened in debug mode because in some seconds SMS arrive. I disabled also WDT and other features of PIC without solve.
I use PIC18F46K22 and CCS V4.135. Can somebody suggest me what I must check ?
Thanks,
Fabri |
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Fabri
Joined: 22 Aug 2005
Posts: 275
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| Posted: Thu Oct 30, 2014 4:49 am |
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I did some test and this is data from PIC and Modem capture with serial terminal. The program check RING and send back SMS with some text information.
In Release modem doesn't send back sms:
| Code: |
\0A+CMGR: 0,,0\0D
\0A\0D
\0AOK\0D
\0A\0D
\0ARING\0D
\0A\0D
\0A+CLIP: "+39XXXXXXXXXX",145,,,,0\0D
\0AATH\0D
\0AOK\0D
\0AAT+CMGS="+39XXXXXXXXXX"\0D
> macchina in funzione contatore progressivo=00000 \0A
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and Release when modem send back SMS:
| Code: |
\0AOK\0D
\0AAT+CMGR=1\0D
\0A+CMGR: 0,,0\0D
\0A\0D
\0AOK\0D
\0A\0D
\0ARING\0D
\0A\0D
\0A+CLIP: "+39XXXXXXXXXX",145,,,"No Name",0\0D
\0AATH\0D
\0AOK\0D
\0AAT+CMGS="+39XXXXXXXXXX"\0D
> macchina in funzione contatore progressivo=00000 \0A
\0A \0D
\0A+CMGS: 187\0D
\0A\0D
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In release mode the modem after confirm request of text of SMS with '>' , stop to work and sometimes I need to power down.
Thanks for your suggestion. |
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temtronic
Joined: 01 Jul 2010
Posts: 9250
Location: Greensville,Ontario
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| Posted: Thu Oct 30, 2014 8:56 am |
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Without seeing a short,complete program it's hard to decide what is the problem...
possible issues..
1) 5V PIC, 3V SMS device
2) lack of 'errors' in the use rs232(....options..)
3) rcv buffer too small....
4) improper rcv ISR...
5) use of delays inside ISR
6) icd=true even though in 'release' mode
post a small program so we can see.....
Jay |
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Fabri
Joined: 22 Aug 2005
Posts: 275
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| Posted: Thu Oct 30, 2014 9:48 am |
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Dear temtronic,
Yes, there's alot of possibility..... the firmware is quite complex but the problem is only in routine SEND_SMS(). Happens only in release firmware not in debug. After some other tests seams modem doesn't receive 0x0A command after sms text. Now I send 2 times "0x0A" and seams all going fine. This is my first experience with GSM so I don't know if send out 2 times cntrl-z command is correct.
Regards,
Fabri |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19559
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| Posted: Thu Oct 30, 2014 9:52 am |
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Add 'grounding'.
Remember the radio stuff will work completely differently with the ground present from the debug unit. |
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Fabri
Joined: 22 Aug 2005
Posts: 275
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| Posted: Thu Oct 30, 2014 10:08 am |
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| My modem isn't RS232 but RS485 so I think grounding is not important.... actually my solution is send cntrl-z two times. |
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hmmpic
Joined: 09 Mar 2010
Posts: 314
Location: Denmark
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| Posted: Thu Oct 30, 2014 11:45 am |
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The way I do it...
| Code: |
fprintf(gsm,"%s%c",mess,26); //mess+ [ctrl]+Z |
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Fabri
Joined: 22 Aug 2005
Posts: 275
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| Posted: Thu Oct 30, 2014 1:44 pm |
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| Interesting.... I'll try this way. |
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Gabriel
Joined: 03 Aug 2009
Posts: 1067
Location: Panama
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| Posted: Thu Oct 30, 2014 3:33 pm |
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| Code: | void SEND_SMS()
{
counter_read=0;
printf("AT+CMGS=\"########\"\r"); // send command and cel #
delay_ms(1000); // Delay long enough for modem response
printf("LORD JESUS ITS A FIRE!!!\n\r"); // Text to reply
putchar(0x1A); // send Ctrl-z
DELAY(20); // Delay a maximum of X seconds
} |
Thats how i do it, but i do like your idea of polling for the > sign.
how ever make sure your modem is not sending returns or newlines prior to the > sign.
G.
_________________
CCS PCM 5.078 & CCS PCH 5.093 |
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Fabri
Joined: 22 Aug 2005
Posts: 275
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| Posted: Fri Oct 31, 2014 12:08 am |
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| Polling '>' tell me when modem is ready to receive text of SMS so I can't wait a long time. Actually I test first char is '>' in case I don't receive it I'll send text after some seconds anyway. |
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