GSM serial port / AT commands problem

[zaid2000]

GSM serial port problem

Hi all..
I'm a student in final year project. My prject is about run a home device by sending a sms from mobile, the message will be recieved by GSM modem connected to board via serial prot,I'm using MicroBasic language and PIC16F877A, Here is some parts of the code:

USART_INIT(9600)
USART_WRITE_TEXT("AT+CMGF=1") 'CHANGE MSG FORMAT
USART_WRITE(13)
USART_WRITE(10)
DELAY_MS(300)

USART_WRITE_TEXT("AT+CMGR=1") 'READ LAST MESG
USART_WRITE(13)
USART_WRITE(10)
DELAY_MS(300)


IF (Y[0]= "1") THEN 'if the msg is "1" then protb.0=1
PORTB.0 = 1
END IF

I think i did everthing right but the problem is that when i send the message it does't work!!!!! !, can anyone help me please.
Ps I also gonna attach the code....PLEASE HELP

 

[ghostajip]

Re: GSM serial port problem

can you show detail schematics design & components..

i think i can help you..provide to me in details then i will make the code.asm by using MPLAB
tell me your phone brand..

 

[otuzsubat]

Why do you use "USART_WRITE(10)"? It is new line command. Is it necessary?

Another advice for you. COnnect gsm modem to a computer serial port. Send this commands to modem by using "Hyperterminal". By this way you can investigate modem reply messages.

 

[nandhu015]

I cant understand why you are reading till you get A and then B?

First check your modem with hyperterminal.

The message returned after sending at+cmgr=1 will contain lot of details before the original message.

Nandhu