http://www.8051projects.net/ Learn to make simple microcontroller projects, pic, 8051, avr and arm projects. download 8051 projects, tutorials, libraries, sample codes. join the microcontroller discussion forum and ask doubts regarding electronics. the best source for 8051 over internet. en-gb 2009-01-08T09:30:15-08:00 contact@nospam.com hourly 1 2000-01-01T12:00+00:00 http://www.8051projects.net/forum-t11328.html 2009-01-08T09:30:15-08:00 I am trying to send an SMS with Wavecom modem using the following code from 8051 uController:CODE:
printf("AT+CMGS=\"98xxxxxxx8\"");
printf("%c", 13);
printf("This is a test msg");
printf("%c", 26);

delay();
scanf("%s", response);

delay();
LCD("Done: ");

delay();
LCD(response);
 The SMS is sent successfully, but the response returned by modem is always displayed as AA on the LCD display. But the response should be OK instead as the modem returns the following response when the SMS is sent successfully:CODE:+CMGS: 132

OK
 I tried sending the SMS from hyperterminal with modem using the same command i.e. AT+CMGS, after sending the SMS the modem returns CODE:+CMGS: 132

OK
 Then why the same is not returned in case of 8051??I also tried to debug by interfacing 8051 to the hyperterminal. The command sent by 8051 display successfully on hyperterminal, when I send something in response to the command from hyperterminal then the same is displayed properly on the LCD. Then what is the problem with Wavecom modem and 8051, why the response sent by modem is not displayed properly on the LCD?Can anyone please help me on this! http://www.8051projects.net/forum-t11328.html 2009-01-08T09:30:15-08:00 say2paul I added the following line to the code to stop echo:printf("ATE0\r\n");CODE:
printf("ATE0\r\n");
delay();

printf("AT+CMGS=\"98xxxxxxx8\"");
printf("%c", 13);
printf("This is a test msg");
printf("%c", 26);

delay();
scanf("%s", response);

delay();
LCD("Done: ");

delay();
LCD(response);
  Now the LCD displays ">" instead of "AA" http://www.8051projects.net/forum-t11328.html 2009-01-08T09:30:15-08:00 say2paul This will eat my head for sure...Now when I added one more scanf("%s", response); the following code is now displaying "+MSG" instead of ">" CODE:
printf("ATE0");
printf("%c", 13);
delay();

printf("AT+CMGS=\"9872808428\"");
printf("%c", 13);

printf("This is a test msg");
printf("%c", 26);
printf("%c", 13);

scanf("%s", response);
scanf("%s", response);

delay();
LCD("Done ");

delay();
LCD(response);
  But how..? I am so much confused....Lets assume everything is going fine, but still it should return +CMGS instead of +MGS. And in case of "EROR" is displayed instead of "ERROR".The second character is never show and disarded... What is happening.. can anyone help..! http://www.8051projects.net/forum-t11328.html 2009-01-08T09:30:15-08:00 sashijoseph Hi Paul,I would suggest creating a custom function for serial RX/TX instead of printf/scanf.Since printf is working OK(sms sent successfully) you could try writing a serial rx function for now.Else try scanf with hyperterminal,just to confirm... http://www.8051projects.net/forum-t11328.html 2009-01-08T09:30:15-08:00 Shailesh NAYAK Hi,+GMGS: 132 is counting of messages sent from the modem, It will be last upto 255 and will start again from "0" as it complete 255. You can either ignore this and can only rely on OK. http://www.8051projects.net/forum-t11328.html 2009-01-08T09:30:15-08:00 say2paul I understand your point but my point is that instead of +GMGS: the LCD is showing +MGS:But if I watch output on Hyperterminal it is +GMGS:Can anyone guide me through this! http://www.8051projects.net/forum-t11328.html 2009-01-08T09:30:15-08:00 shyam may be it is indeed +CMGS instead of +MGSand may be it sends OK instead of AAwhat i mean is I will prefer that portion os the code when u are displaying the scanned response! http://www.8051projects.net/forum-t11328.html 2009-01-08T09:30:15-08:00 say2paul Yes it is +CMGS when watching output on hyperterminal but +MGS with LCD..shyam wrote ...what i mean is I will prefer that portion os the code when u are displaying the scanned response!Prefer means?? http://www.8051projects.net/forum-t11328.html 2009-01-08T09:30:15-08:00 Ajay he mean that he want to see the code where you have displayed the response on lcd