GSM Modem reading sms with PIC18F4520

[hez_91]

Hi,

I am working with a iTegno 3800 GSM modem and I require to wake the PIC out of sleep mode and retrieve the data in the SMS whenever I receive it. The programming language i am using is C.

What are the possible ways I could do this? I was thinking of EUSART Receive Interrupt bits but I am not sure on how to implement this.

Thanks
Wong

 

[davemaster]

Greetings,

Try turn the PIC back from sleep mode using uart interrupt...

 

[otuzsubat]

i think that you cannot wake up the microcontroller by usart. because modem doesnt procude a signal when received a sms.
i suggest you, first send sms to modem, and then call it. incoming call produce a square wave in the communication port of modem. you can use this square wave to wake up pic18f4520

 

[nandhu015]

i think that you cannot wake up the microcontroller by usart. because modem doesnt procude a signal when received a sms.

Sim300 sends a phrase of signals with details when a message is received. But i dont know about the iTegno 3800 modem

Nandhu

 

[davemaster]

i think that you cannot wake up the microcontroller by usart. because modem doesnt procude a signal when received a sms.
i suggest you, first send sms to modem, and then call it. incoming call produce a square wave in the communication port of modem. you can use this square wave to wake up pic18f4520

Greetings,

You're right, and that square pulse can be used to wake up the pic using an external interruption pin... Thanks... in the modem that You use, what pin is that, that from the square pulse come from?

Thanks

 

[otuzsubat]

i used siemens mc35. there is a serial port cable to connect modem. the 9th pin of it is producing a square wave.