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Cellphone PIC interaction

 
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falonsos



Joined: 01 May 2010
Posts: 5

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Cellphone PIC interaction
PostPosted: Wed May 19, 2010 2:54 pm     Reply with quote
Hello!

I'm making a project to send and receive SMS using a Siemens C66 and a PIC 16F877a.

I can send SMS (using PDU mode) but I haven't tried to receive SMS yet. First I tried to send "AT" to get the response "OK" but all I get from the cellphone is "at", no matter what I send him (I tried with several commands).

The code I'm using is:
Code:

#include <16F877A.h>
//#device adc=8
#use delay(clock=20000000)
#use rs232(baud=9600,xmit=PIN_C6,rcv=PIN_C7,bits=8)

#FUSES NOWDT                    //No Watch Dog Timer
#FUSES RC                       //Resistor/Capacitor Osc with CLKOUT
#FUSES NOPUT                    //No Power Up Timer
#FUSES NOPROTECT                //Code not protected from reading
#FUSES NODEBUG                  //No Debug mode for ICD
#FUSES NOBROWNOUT               //No brownout reset
#FUSES NOLVP                    //No low voltage prgming, B3(PIC16) or B5(PIC18) used for I/O
#FUSES NOCPD                    //No EE protection
#FUSES NOWRT                    //Program memory not write protected

#include <math.h>
#include <string.h>
#include <kbd44.c>
#include <lcd.c>

void main()
{
lcd_init();

while(TRUE){
  delay_ms(100);
  printf("AT\n\r");
  while(TRUE){//i read all the time to get whats going on
     if(kbhit()){
         reci = getc();
         printf(lcd_putc,"%c",reci);//print on LCD to see whats going on
     }
  }
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Wed May 19, 2010 5:20 pm     Reply with quote
Quote:
#include <16F877A.h>
//#device adc=8
#use delay(clock=20000000)
#use rs232(baud=9600,xmit=PIN_C6,rcv=PIN_C7,bits=8)

#FUSES NOWDT //No Watch Dog Timer
#FUSES RC

The RC fuse is wrong for 20 MHz operation. You should use HS.

Also, you have a big delay_ms() statement in your code, so add
the 'ERRORS' parameter to clear any UART Rx overrun errors that
may occur while inside the delay. Example:
Quote:
#use rs232(baud=9600,xmit=PIN_C6,rcv=PIN_C7,bits=8, ERRORS)
Rohit de Sa



Joined: 09 Nov 2007
Posts: 282
Location: India

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PostPosted: Thu May 20, 2010 9:39 am     Reply with quote
Not all phones support _all_ AT commands. Check your phone's manual or online forums to see if you can read SMSes from your phone. On my Nokia 3500c, I can send SMSes using AT commands, but I can't read them :-| (don't know why they'd not implement something like that, though).

Rohit
falonsos



Joined: 01 May 2010
Posts: 5

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PostPosted: Thu May 20, 2010 1:50 pm     Reply with quote
Thanks a lot PCM programmer, I implement what you just wrote but I still don't have any results, I still receive an "echo" from the cellphone. (what I send through the PIC is the same I'm receiving. But only when I put AT+XXX. If I don't put the AT before the message I don't get a response).

I have just check that the cellphone able to read SMS with AT commands, but what I think is still strange is that I receive an echo (exactly what I send).

Thanks in advance.
sjb



Joined: 13 Apr 2010
Posts: 34
Location: UK

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Re: Cellphone PIC interaction
PostPosted: Fri May 21, 2010 12:39 am     Reply with quote
falonsos wrote:
The code I'm using is:
Code:

  printf("AT\n\r");

Are you sure about that line end sequence. That now even DOS(which would be \r\n.

According to wikipedia the HAYES command set needs just a CR ('\r') to complete the command.
Gabriel



Joined: 03 Aug 2009
Posts: 1067
Location: Panama

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PostPosted: Fri May 21, 2010 6:50 am     Reply with quote
hi,

yo could try using a SE T290A ... sends and recieves txt msgs......its what i use with much success

i posted code to recieve text sms on the "code Library" part of this forum

under "recieving TXT messages"


you can look at some of my routines....for proper comands.....

i think "sjb" might have a point in the end line sequence....

i send my returns as hex chars.... and NO Newline.......

take a look....

http://www.ccsinfo.com/forum/viewtopic.php?t=42527

Gabriel
_________________
CCS PCM 5.078 & CCS PCH 5.093
falonsos



Joined: 01 May 2010
Posts: 5

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PostPosted: Sun May 23, 2010 11:51 am     Reply with quote
I solved the problem.

It was that i get each char and then print it on the LCD screen wasting time on that, so i missed a lot of chars coming on Rx while printing.


Thanks a lot for your help!

Also, i hope this topic would help other people to.
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