How to trap incoming Calls/SMS when no RING pin is available


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  1. #1
    Join Date
    Aug 2006
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    Default How to trap incoming Calls/SMS when no RING pin is available

    Hi All,

    As I'm playing with different GSM modules, I'm stumbling on SIM5320E and SIM5360E that have no easily accessible "RING" pin (like on SIM800/SIM900/etc modules) which I normally use to trap an incoming call/SMS via an External Interrupt of the PIC.

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    In fact, they do have a "RING" indicator (Pin 69 of both modules) but it is not lead to an external pad or pin which makes it difficult to use unless one solders a wire directly on the chip's pin (I don't even know if it would work - not tried yet).

    Since lots of modules seem to be made like that, my guess is that there must be a software method to trap incoming call/SMS.

    Shall I start to use UART interrupts (never done before...) or is there another way to go?
    Roger

  2. #2
    Join Date
    Sep 2009
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    680

    Default Re: How to trap incoming Calls/SMS when no RING pin is available

    That would be most reliable way to go.
    Also you can call every ms something like this:

    Hserin 2,NoData,[WAIT(13,10),STR RecBuffer\100\10]
    This will capture date betwen two CRLF, and modem send one at start and one at end of line.
    Then just check content of buffer, does it contain "RING"...

  3. #3
    Join Date
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    758

    Default Re: How to trap incoming Calls/SMS when no RING pin is available

    Thanks pedja089,

    I have effectively started this way ;-)
    Roger

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