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Good Morning, I am doing a project based on GSM interfacing. The controller which i am using is AT89s52. The project is working successfully up to some extent but sometimes when controller sends AT+CMGS command i.e. to send text message, MODEM retaliates the command with > character, but as soon as controller gets response from MODEM it is getting reset. And as MODEM doesn't get Ctrl+Z command it gets stuck and total system gets failure. I am not getting the way out. I am facing the same problem even if i replace the controller with ARM-7 processor(LPC2138).
... power supply issue?
Remember that GSM devices take extremely large peaks of current - possibly a couple of amps!!
Or (also?) some bug in your code which you have successfully ported from AT89s52 to LPC2138...?